Dominion Energy (D) 10-K 28 Feb 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Registrant Name	DOMINION ENERGY, INC.
Entity Central Index Key	0000715957
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 62
Entity File Number	001-08489
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	54-1229715
Entity Address, Address Line One	120 TREDEGAR STREET
Entity Address, City or Town	RICHMOND
Entity Address, Postal Zip Code	23219
City Area Code	804
Local Phone Number	819-2000
Entity Address, State or Province	VA
Entity Common Stock, Shares Outstanding		838,000,325
Common Stock
Document Information [Line Items]
Trading Symbol	D
Title of 12(b) Security	Common Stock, no par value
Security Exchange Name	NYSE
2016 Series A 5.25% Enhanced Junior Subordinated Notes
Document Information [Line Items]
Trading Symbol	DRUA
Title of 12(b) Security	2016 Series A 5.25% Enhanced Junior Subordinated Notes
Security Exchange Name	NYSE
2019 Series A Corporate Units
Document Information [Line Items]
Trading Symbol	DCUE
Title of 12(b) Security	2019 Series A Corporate Units
Security Exchange Name	NYSE
Virginia Electric and Power Company
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Registrant Name	VIRGINIA ELECTRIC AND POWER COMPANY
Entity Central Index Key	0000103682
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	000-55337
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	54-0418825
Entity Address, Address Line One	120 TREDEGAR STREET
Entity Address, City or Town	RICHMOND
Entity Address, Postal Zip Code	23219
City Area Code	804
Local Phone Number	819-2000
Entity Address, State or Province	VA
Entity Common Stock, Shares Outstanding		274,723
Dominion Energy Gas Holdings, LLC
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Registrant Name	DOMINION ENERGY GAS HOLDINGS, LLC
Entity Central Index Key	0001603291
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-37591
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	46-3639580
Entity Address, Address Line One	120 TREDEGAR STREET
Entity Address, City or Town	RICHMOND
Entity Address, Postal Zip Code	23219
City Area Code	804
Local Phone Number	819-2000
Entity Address, State or Province	VA
Entity Common Stock, Shares Outstanding		0
Dominion Energy Gas Holdings, LLC | 2014 Series C 4.6% Senior Notes
Document Information [Line Items]
No Trading Symbol Flag	true
Title of 12(b) Security	2014 Series C 4.6% Senior Notes
Security Exchange Name	NYSE

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Revenue	[1]	$ 16,572	$ 13,366	$ 12,586
Operating Expenses
Electric fuel and other energy-related purchases		2,938	2,814	2,301
Purchased electric capacity		88	122	6
Purchased (excess) gas		1,536	645	701
Other operations and maintenance		4,428	3,458	3,200
Depreciation, depletion and amortization		2,655	2,000	1,905
Other taxes		1,040	703	668
Impairment of assets and related charges		1,535	403	15
Gains on sales of assets		(162)	(380)	(147)
Total operating expenses		14,058	9,765	8,649
Income from operations		2,514	3,601	3,937
Earnings from equity method investees		168	197	(18)
Other income	[1]	986	1,021	358
Interest and related charges		1,773	1,493	1,205
Income from operations including noncontrolling interests before income tax expense (benefit)		1,727	3,129	3,090
Income tax expense (benefit)		351	580	(30)
Net Income Including Noncontrolling Interests		1,376	2,549	3,120
Noncontrolling Interests		18	102	121
Net Income		$ 1,358	$ 2,447	$ 2,999
Earnings Per Common Share
Net income attributable to Dominion Energy — Basic		$ 1.66	$ 3.74	$ 4.72
Net income attributable to Dominion Energy — Diluted		$ 1.62	$ 3.74	$ 4.72
Virginia Electric and Power Company
Operating Revenue	[2]	$ 8,108	$ 7,619	$ 7,556
Operating Expenses
Electric fuel and other energy-related purchases	[2]	2,178	2,318	1,909
Purchased electric capacity		40	122	6
Affiliated suppliers		367	305	309
Other		1,376	1,371	1,169
Depreciation, depletion and amortization		1,223	1,132	1,141
Other taxes		328	300	290
Impairment of assets and related charges		757
Total operating expenses		6,269	5,548	4,824
Income from operations		1,839	2,071	2,732
Other income		98	22	76
Interest and related charges	[2]	524	511	494
Income from operations including noncontrolling interests before income tax expense (benefit)		1,413	1,582	2,314
Income tax expense (benefit)		264	300	774
Net Income		1,149	1,282	1,540
Dominion Energy Gas Holdings, LLC
Operating Revenue	[3]	2,169	1,996	1,523
Operating Expenses
Purchased (excess) gas	[3]	7	(10)	109
Other energy-related purchases		2	4	4
Affiliated suppliers		168	132	123
Other	[3]	556	584	449
Depreciation, depletion and amortization		367	333	242
Other taxes		154	120	99
Impairment of assets and related charges		13	163	15
Gains on sales of assets		(2)	(117)	(70)
Total operating expenses		1,265	1,209	971
Income from operations		904	787	552
Earnings from equity method investees		43	54	47
Other income		166	89	62
Interest and related charges	[3]	311	174	60
Income from operations including noncontrolling interests before income tax expense (benefit)		802	756	601
Income tax expense (benefit)		101	124	(65)
Net Income from continuing operations		701	632	666
Net Income from discontinued operations	[4]	141	24	163
Net Income Including Noncontrolling Interests		842	656	829
Noncontrolling Interests		121	175	126
Net Income		$ 721	$ 481	$ 703
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to affiliates.
[3]	See Note 25 for amounts attributable to related parties.
[4]	Includes income tax expense of $33 million, less than $1 million and $91 million in 2019, 2018 and 2017, respectively.

Consolidated Statements of In_2

Consolidated Statements of Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dominion Energy Gas Holdings, LLC
Income tax expense from discontinued operations	$ 33	$ 1	$ 91

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income including noncontrolling interests	$ 1,376	$ 2,549	$ 3,120
Net income	1,358	2,447	2,999
Other comprehensive income (loss), net of taxes:
Net deferred gains (losses) on derivatives-hedging activities, net of tax	(110)	30	8
Changes in unrealized net gains (losses) on nuclear decommissioning trust funds, net of tax	39	(18)	215
Changes in net unrecognized pension and other postretirement benefit costs, net of tax	(22)	(215)	(69)
Amounts reclassified to net income:
Net derivative (gains) losses-hedging activities, net of tax	(62)	102	(29)
Net realized (gains) losses on investment securities, net of tax	(4)	5	(37)
Net pension and other postretirement benefit costs, net of tax	66	78	50
Changes in other comprehensive gains (losses) from equity method investees, net of tax		1	3
Total other comprehensive income (loss)	(93)	(17)	141
Comprehensive income including noncontrolling interests	1,283	2,532	3,261
Comprehensive income attributable to noncontrolling interests	18	103	122
Comprehensive income	1,265	2,429	3,139
Virginia Electric and Power Company
Net income	1,149	1,282	1,540
Other comprehensive income (loss), net of taxes:
Net deferred gains (losses) on derivatives-hedging activities, net of tax	(22)	1	(5)
Changes in unrealized net gains (losses) on nuclear decommissioning trust funds, net of tax	5		24
Amounts reclassified to net income:
Net derivative (gains) losses-hedging activities, net of tax	1	1	1
Net realized (gains) losses on investment securities, net of tax	(1)		(4)
Total other comprehensive income (loss)	(17)	2	16
Comprehensive income	1,132	1,284	1,556
Dominion Energy Gas Holdings, LLC
Net income including noncontrolling interests	842	656	829
Net income	721	481	703
Other comprehensive income (loss), net of taxes:
Net deferred gains (losses) on derivatives-hedging activities, net of tax	(61)	(16)	6
Changes in net unrecognized pension and other postretirement benefit costs, net of tax	33	(52)	20
Amounts reclassified to net income:
Net derivative (gains) losses-hedging activities, net of tax	5	19	(4)
Net pension and other postretirement benefit costs, net of tax	5	4	4
Total other comprehensive income (loss)	(18)	(45)	26
Comprehensive income including noncontrolling interests	824	611	855
Comprehensive income attributable to noncontrolling interests	120	175	127
Comprehensive income	$ 704	$ 436	$ 728

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net deferred gains (losses) on derivative-hedging activities, tax	$ 35	$ (10)	$ (3)
Changes in unrealized net gains (losses) on investment securities, tax	(14)	5	(121)
Changes in net unrecognized pension and other postretirement benefit costs, tax	(4)	75	32
Net derivative (gains) losses-hedging activities, tax	21	(35)	18
Net realized (gains) losses on investment securities, tax	1	(2)	21
Net pension and other postretirement benefit costs, tax	(23)	(21)	(32)
Changes in other comprehensive income (loss) from equity method investees, tax		(1)	(2)
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	8	(1)	3
Changes in unrealized net gains (losses) on investment securities, tax	(2)		(16)
Net realized (gains) losses on investment securities, tax	1		3
Dominion Energy Gas Holdings, LLC
Net deferred gains (losses) on derivative-hedging activities, tax	22	5	(3)
Changes in net unrecognized pension and other postretirement benefit costs, tax	(13)	20	(8)
Net derivative (gains) losses-hedging activities, tax	(2)	(7)	2
Net pension and other postretirement benefit costs, tax	$ (2)	$ (2)	$ (2)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Current Assets
Cash and cash equivalents		$ 166		$ 268
Customer receivables (less allowance for doubtful accounts)		2,278		1,749
Other receivables (less allowance for doubtful accounts)	[1]	367		331
Inventories:
Materials and supplies		1,193		1,039
Fossil fuel		412		287
Gas stored		137		92
Prepayments		328		265
Regulatory assets		879		496
Other		328		634
Total current assets		6,088		5,161
Investments
Nuclear decommissioning trust funds		6,192		4,938
Investment in equity method affiliates		1,646		1,278
Other		379		344
Total investments		8,217		6,560
Property, Plant and Equipment
Property, plant and equipment		97,466		76,578
Accumulated depreciation, depletion and amortization		(28,384)		(22,018)
Total property, plant and equipment, net		69,082		54,560
Deferred Charges and Other Assets
Goodwill	[2]	8,946		6,410
Pension and other postretirement benefit assets		1,708		1,279
Intangible assets, net		791		670
Regulatory assets		7,687		2,676
Other		1,304		598
Total deferred charges and other assets		20,436		11,633
Total assets		103,823		77,914
Current Liabilities
Securities due within one year		3,162		3,624
Credit facility borrowings	[3]			73
Short-term debt		911		334
Accounts payable		1,115		914
Accrued interest, payroll and taxes		1,323		836
Regulatory liabilities		497		356
Reserves for SCANA legal proceedings		696		0
Other	[1]	2,235		1,510
Total current liabilities		9,939		7,647
Long-Term Debt
Long-term debt		30,313		26,293
Junior subordinated notes		3,406		3,430
Remarketable subordinated notes				1,386
Finance leases		105		35
Total long-term debt		33,824		31,144
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		6,277		5,116
Regulatory liabilities		11,001		6,840
Asset retirement obligations		4,866		2,250
Pension and other postretirement benefit liability		2,366		2,328
Other	[1]	1,517		541
Total deferred credits and other liabilities		26,027		17,075
Total liabilities		69,790		55,866
Commitments and Contingencies (see Note 23)
Equity
Preferred stock (See Note 19)		2,387		0
Common stock - no par	[4]	23,824		12,588
Retained earnings		7,576		9,219
Accumulated other comprehensive income (loss)		(1,793)		(1,700)
Total shareholder's equity		31,994		20,107
Noncontrolling interests		2,039		1,941
Total equity		34,033		22,048
Total liabilities and equity		103,823		77,914
Virginia Electric and Power Company
Current Assets
Cash and cash equivalents		17		29
Customer receivables (less allowance for doubtful accounts)		1,163		999
Other receivables (less allowance for doubtful accounts)		106		76
Affiliated receivables		27		101
Inventories:
Materials and supplies		549		550
Fossil fuel		324		287
Prepayments		27		28
Regulatory assets		433		424
Other	[5]	30		77
Total current assets		2,676		2,571
Investments
Nuclear decommissioning trust funds		2,881		2,369
Other		3		3
Total investments		2,884		2,372
Property, Plant and Equipment
Property, plant and equipment		47,038		44,524
Accumulated depreciation, depletion and amortization		(14,156)		(14,003)
Total property, plant and equipment, net		32,882		30,521
Deferred Charges and Other Assets
Pension and other postretirement benefit assets	[5]	287		254
Intangible assets, net		271		250
Regulatory assets		1,863		737
Other	[5]	565		175
Total deferred charges and other assets		2,986		1,416
Total assets		41,428		36,880
Current Liabilities
Securities due within one year		4		350
Short-term debt		243		314
Accounts payable		334		339
Payables to affiliates		210		209
Affiliated current borrowings		107		224
Accrued interest, payroll and taxes		253		248
Asset retirement obligations		340		245
Regulatory liabilities		167		299
Derivative Liabilities	[5]	243		25
Customer deposits		121		121
Other		450		441
Total current liabilities		2,472		2,815
Long-Term Debt
Long-Term Debt		12,325		11,320
Finance leases		16		1
Total long-term debt		12,341		11,321
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		2,962		3,017
Regulatory liabilities		5,074		4,647
Asset retirement obligations		3,241		1,200
Pension and other postretirement benefit liability	[5]	782		632
Other	[5]	567		201
Total deferred credits and other liabilities		12,626		9,697
Total liabilities		27,439		23,833
Commitments and Contingencies (see Note 23)
Equity
Common stock - no par	[6]	5,738		5,738
Other paid-in capital		1,113		1,113
Retained earnings		7,167		6,208
Accumulated other comprehensive income (loss)		(29)		(12)
Total shareholder's equity		13,989		13,047
Total liabilities and equity		41,428		36,880
Dominion Energy Gas Holdings, LLC
Current Assets
Cash and cash equivalents		27	[7]	99
Customer receivables (less allowance for doubtful accounts)	[8]	173		187
Other receivables (less allowance for doubtful accounts)	[8]	26		18
Affiliated receivables		362		319
Affiliated notes receivable				819
Inventories:
Materials and supplies		120		95
Gas stored		2		2
Prepayments		73		77
Gas imbalances	[8]	52		187
Regulatory assets	[9]	8		8
Current assets of discontinued operations		0		444
Other		23		101
Total current assets		858		2,348
Investments
Affiliated notes receivables		3,437		4,317
Investment in equity method affiliates		312		339
Total investments		3,749		4,656
Property, Plant and Equipment
Property, plant and equipment		15,166		14,700
Accumulated depreciation, depletion and amortization		(3,538)		(3,219)
Total property, plant and equipment, net		11,628		11,481
Deferred Charges and Other Assets
Goodwill	[2]	1,471		1,471
Pension and other postretirement benefit assets	[8]	840		705
Intangible assets, net		106		115
Regulatory assets		40		52
Other	[8]	92		74
Total deferred charges and other assets		2,549		2,417
Noncurrent Assets of Discontinued Operations				5,849
Total assets		18,784		26,751
Current Liabilities
Securities due within one year		700		748
Credit facility borrowings	[3]			73
Short-term debt		62		10
Accounts payable		59		76
Payables to affiliates		82		124
Affiliated current borrowings		260		3,097
Accrued interest, payroll and taxes		128		116
Regulatory liabilities	[10]	41		24
Current liabilities of discontinued operations				1,273
Other	[8]	161		238
Total current liabilities		1,452		5,755
Long-Term Debt
Long-Term Debt		4,821		7,022
Finance leases		5		0
Total long-term debt		4,826		7,022
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		1,288		1,330
Regulatory liabilities		800		765
Other		189		118
Total deferred credits and other liabilities		2,277		2,213
Noncurrent Liabilities of Discontinued Operations				2,896
Total liabilities		8,555		17,886
Commitments and Contingencies (see Note 23)
Equity
Predecessor Equity				1,804
Membership interests		9,031		4,566
Accumulated other comprehensive income (loss)		(187)		(169)
Total shareholders' equity		8,844		6,201
Noncontrolling interests		1,385		2,664
Total equity		10,229		8,865
Total liabilities and equity		$ 18,784		$ 26,751
[1]	See Note 9 for amounts attributable to related parties.
[2]	Goodwill amounts do not contain any accumulated impairment losses.
[3]	In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018.
[4]	1.8 billion shares authorized; 838 million shares and 681 million shares outstanding at December 31, 2019 and 2018, respectively.
[5]	See Note 25 for amounts attributable to affiliates.
[6]	500,000 shares authorized; 274,723 shares outstanding at December 31, 2019 and 2018.
[7]	At December 31, 2018, 2017 and 2016, Dominion Energy Gas had $9 million, $3 million and $14 million of cash and cash equivalents included in current assets of discontinued operations, respectively.
[8]	See Note 25 for amounts attributable to related parties.
[9]	Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[10]	Current regulatory liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Customer receivables, allowance for doubtful accounts	$ 20	$ 14
Other receivables, allowance for doubtful accounts	$ 3	$ 4
Common stock, shares authorized	1,800,000,000	1,800,000,000
Common stock, shares outstanding	838,000,000	681,000,000
Virginia Electric and Power Company
Customer receivables, allowance for doubtful accounts	$ 9	$ 9
Other receivables, allowance for doubtful accounts	$ 2	$ 3
Common stock, shares authorized	500,000	500,000
Common stock, shares outstanding	274,723	274,723
Dominion Energy Gas Holdings, LLC
Customer receivables, allowance for doubtful accounts	$ 2	$ 1

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	NRG Energy, Inc	Common Units	Preferred Stock	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Shareholders' Equity	Noncontrolling Interests	Noncontrolling InterestsNRG Energy, Inc	Noncontrolling InterestsCommon Units
Beginning balance at Dec. 31, 2016	$ 16,840				$ 8,550	$ 6,854	$ (799)	$ 14,605	$ 2,235
Beginning balance (in shares) at Dec. 31, 2016					628
Net income (loss) including noncontrolling interests	3,120					2,999		2,999	121
Contributions to Four Brothers and Three Cedars		$ 9								$ 9
Issuance of common stock	1,302				$ 1,302			1,302
Issuance of common stock (in shares)					17
Sale of Dominion Energy Midstream common units—net of offering costs			$ 18								$ 18
Stock awards (net of change in unearned compensation)	22				$ 22			22
Dividends and distributions	(2,087)					(1,931)		(1,931)	(156)
Other comprehensive income (loss), net of tax	141						140	140	1
Other	5				(9)	14		5
Ending balance at Dec. 31, 2017	19,370				$ 9,865	7,936	(659)	17,142	2,228
Ending Balance (in shares) at Dec. 31, 2017					645
Cumulative-effect of changes in accounting principles	6				$ (127)	1,029	(1,023)	(121)	127
Net income (loss) including noncontrolling interests	2,549					2,447		2,447	102
Issuance of common stock	2,461				$ 2,461			2,461
Issuance of common stock (in shares)					36
Sale of Dominion Energy Midstream common units—net of offering costs	4								4
Stock awards (net of change in unearned compensation)	22				$ 22			22
Remeasurement of noncontrolling interest in Dominion Energy Midstream					375			375	(375)
Dividends and distributions	(2,331)					(2,185)		(2,185)	(146)
Other comprehensive income (loss), net of tax	(17)						(18)	(18)	1
Other	(16)				(8)	(8)		(16)
Ending balance at Dec. 31, 2018	22,048				$ 12,588	9,219	(1,700)	20,107	1,941
Ending Balance (in shares) at Dec. 31, 2018					681
Net income (loss) including noncontrolling interests	1,376					1,358		1,358	18
Issuance of common stock	$ 5,401			$ 2,387	$ 3,014			5,401
Issuance of common stock (in shares)	6.1			2	39
Stock purchase contract component of 2019 Equity Units	$ (264)				$ (264)			(264)
Acquisition of SCANA	6,818				$ 6,818			6,818
Acquisition of SCANA (in shares)					96
Acquisition of public interest in Dominion Energy Midstream (in shares)					22
Acquisition of public interest in Dominion Energy Midstream	(40)				$ 1,181			1,181	(1,221)
Stock awards (net of change in unearned compensation)	24				24			24
Other comprehensive income (loss), net of tax	(93)						(93)	(93)
Other	(14)				(13)	(1)		(14)
Sale of interest in Cove Point	1,862				476			476	1,386
Preferred stock dividends	(17)					(17)		(17)
Common dividends and distributions	(3,068)					(2,983)		(2,983)	(85)
Ending balance at Dec. 31, 2019	$ 34,033			$ 2,387	$ 23,824	$ 7,576	$ (1,793)	$ 31,994	$ 2,039
Ending Balance (in shares) at Dec. 31, 2019				2	838

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 0.9175	$ 0.9175	$ 0.9175	$ 0.9175	$ 0.835	$ 0.835	$ 0.835	$ 0.835	$ 3.67	$ 3.34	$ 3.035

Virginia Electric and Power Com

Virginia Electric and Power Company Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Millions	Total	Virginia Electric and Power Company	Common Stock	Common StockVirginia Electric and Power Company	Other Paid-In CapitalVirginia Electric and Power Company	Retained Earnings	Retained EarningsVirginia Electric and Power Company	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Virginia Electric and Power Company
Beginning balance at Dec. 31, 2016		$ 11,865		$ 5,738	$ 1,113		$ 4,968		$ 46
Beginning balance (in shares) at Dec. 31, 2016			628,000	275
Net income	$ 2,999	1,540					1,540
Dividends	(2,087)	(1,199)				$ (1,931)	(1,199)
Other comprehensive income (loss), net of tax	141	16						$ 140	16
Other	(5)	2	$ 9			(14)	2
Ending balance at Dec. 31, 2017		12,224		$ 5,738	1,113		5,311	(659)	62
Ending Balance (in shares) at Dec. 31, 2017			645,000	275
Cumulative-effect of changes in accounting principles	6	3	$ (127)			1,029	79	(1,023)	(76)
Net income	2,447	1,282					1,282
Dividends	(2,331)	(464)				(2,185)	(464)
Other comprehensive income (loss), net of tax	(17)	2						(18)	2
Other	16		$ 8			8
Ending balance at Dec. 31, 2018	20,107	13,047		$ 5,738	1,113		6,208	(1,700)	(12)
Ending Balance (in shares) at Dec. 31, 2018			681,000	275
Net income	1,358	1,149					1,149
Dividends		(190)					(190)
Other comprehensive income (loss), net of tax	(93)	(17)						(93)	(17)
Other	14		$ 13			$ 1
Ending balance at Dec. 31, 2019	$ 31,994	$ 13,989		$ 5,738	$ 1,113		$ 7,167	$ (1,793)	$ (29)
Ending Balance (in shares) at Dec. 31, 2019			838,000	275

Dominion Energy Gas Holdings, L

Dominion Energy Gas Holdings, LLC Consolidated Statements of Equity - USD ($) $ in Millions	Total	Dominion Energy Gas Holdings, LLC	Predecessor EquityDominion Energy Gas Holdings, LLC	Membership InterestsDominion Energy Gas Holdings, LLC	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Dominion Energy Gas Holdings, LLC	Total Members' Equity	Total Members' EquityDominion Energy Gas Holdings, LLC	Noncontrolling Interests	Noncontrolling InterestsDominion Energy Gas Holdings, LLC	Common Units	Common UnitsDominion Energy Gas Holdings, LLC	Common UnitsNoncontrolling Interests	Common UnitsNoncontrolling InterestsDominion Energy Gas Holdings, LLC
Beginning balance at Dec. 31, 2016	$ 16,840	$ 7,687	$ 1,438	$ 3,659	$ (799)	$ (123)	$ 14,605	$ 4,974	$ 2,235	$ 2,713
Net income including noncontrolling interests	3,120	829	88	615			2,999	703	121	126
Sale of Dominion Energy Midstream common units—net of offering costs											$ 18	$ 18	$ 18	$ 18
Dividends and distributions	(2,087)	(121)	(19)	(15)			(1,931)	(34)	(156)	(87)
Distributions to noncontrolling interests			(193)					(193)		193
Equity contributions from Dominion Energy		51	44					44		7
Other comprehensive income (loss), net of tax		26				25		25		1
Other	(5)	5	3	2			(5)	5
Ending balance at Dec. 31, 2017	19,370	8,495	1,361	4,261	(659)	(98)	17,142	5,524	2,228	2,971
Cumulative-effect of changes in accounting principles	6	3		29	(1,023)	(26)	(121)	3	127
Net income including noncontrolling interests	2,549	656	180	301			2,447	481	102	175
Sale of Dominion Energy Midstream common units—net of offering costs	4								4			$ 4		$ 4
Remeasurement of noncontrolling interest in Dominion Energy Midstream			375				375	375	(375)	(375)
Dividends and distributions	(2,331)	(296)	(133)	(25)			(2,185)	(158)	(146)	(138)
Distributions to noncontrolling interests			(27)					(27)		27
Equity contributions from Dominion Energy		48	48					48
Other comprehensive income (loss), net of tax		(45)				(45)		(45)
Other	16						16
Ending balance at Dec. 31, 2018	22,048	8,865	1,804	4,566	(1,700)	(169)	20,107	6,201	1,941	2,664
Net income including noncontrolling interests	1,376	842	232	489			1,358	721	18	121
Acquisition of public interest in Dominion Energy Midstream	(40)	(40)	1,181				1,181	1,181	(1,221)	(1,221)
Dividends and distributions		(636)	(457)					(457)		(179)
Equity contributions from Dominion Energy		3,385	3,385					3,385
Dominion Energy Gas Restructuring		(2,168)	$ (6,145)	3,978		(1)		(2,168)
Other comprehensive income (loss), net of tax		(18)				(17)		(17)		(1)
Other	14	(1)		(2)			14	(2)		1
Ending balance at Dec. 31, 2019	$ 34,033	$ 10,229		$ 9,031	$ (1,793)	$ (187)	$ 31,994	$ 8,844	$ 2,039	$ 1,385

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income including noncontrolling interests		$ 1,376	$ 2,549	$ 3,120
Net income		1,358	2,447	2,999
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)		2,977	2,280	2,202
Deferred income taxes and investment tax credits		216	517	(3)
Proceeds from assignment of tower rental portfolio				91
Contribution to pension plan		(21)		(75)
Provision for refunds and rate credits to electric utility customers		800	77	0
Impairment of assets and other charges		1,333	395	15
Charge related to a voluntary retirement program		320
Gains on sales of assets and equity method investments		(167)	(1,006)	(148)
Net (gains) losses on nuclear decommissioning trusts funds and other investments		(626)	102	(117)
Charges associated with equity method investments				158
Charge (revision) for future ash pond and landfill closure costs		(113)	81
Other adjustments		(5)	19	33
Changes in:
Accounts receivable		(71)	(110)	(103)
Inventories		(90)	(29)	15
Deferred fuel and purchased gas costs, net		195	(247)	(71)
Prepayments		(225)	(51)	(62)
Accounts payable		(225)	67	(89)
Accrued interest, payroll and taxes		(78)	(12)	64
Customer deposits		(101)	54	15
Margin deposit assets and liabilities		60		(10)
Net realized and unrealized changes related to derivative activities		43	181	44
Asset retirement obligations		41	(35)	(94)
Pension and other postretirement benefits		(148)	(114)	(177)
Other operating assets and liabilities		(287)	55	(306)
Net cash provided by operating activities		5,204	4,773	4,502
Investing Activities
Plant construction and other property additions		(4,980)	(4,254)	(5,504)
Cash and restricted cash acquired in the SCANA Combination		389
Acquisition of solar development projects		(341)	(151)	(405)
Proceeds from sales of securities		1,712	1,804	1,831
Purchases of securities		(1,749)	(1,894)	(1,940)
Proceeds from sales of assets and equity method investments		447	2,542	138
Contributions to equity method affiliates		(209)	(428)	(370)
Distributions from equity method affiliates		9	36	275
Other		100	(13)	33
Net cash used in investing activities		(4,622)	(2,358)	(5,942)
Financing Activities
Issuance (repayment) of short-term debt, net		404	(2,964)	143
Issuance of short-term notes		3,000	1,450
Repayment and repurchase of short-term notes		(3,000)	(1,450)	(250)
Credit facility borrowings (repayments)		0	73
Issuance and remarketing of long-term debt		4,374	6,362	3,880
Repayment and repurchase of long-term debt (including redemption premiums)		(9,116)	(5,682)	(1,572)
Proceeds from sale of interest in Cove Point		2,078
Net proceeds from issuance of Dominion Energy Midstream common units			4	18
Issuance of common stock		2,515	2,461	1,302
Issuance of Series B preferred stock		791
Issuance of 2019 Equity Units		1,582
Common dividend payments		(2,983)	(2,185)	(1,931)
Other		(236)	(278)	(287)
Net cash provided by (used in) financing activities		(704)	(2,209)	1,303
Increase (decrease) in cash, restricted cash and equivalents		(122)	206	(137)
Cash, restricted cash and equivalents at beginning of year		391	185	322
Cash, restricted cash and equivalents at end of year		269	391	185
Supplemental Cash Flow Information
Interest and related charges, excluding capitalized amounts		1,643	1,362	1,083
Income taxes		106	89	9
Significant noncash investing and financing activities:
Accrued capital expenditures	[1],[2],[3],[4],[5]	555	307	343
Leases	[1],[2],[3],[4],[5],[6]	157
Receivables from sales of assets and equity method investments	[1],[2],[3],[4],[5]	5	159
Guarantee provided by equity method affiliate	[1],[2],[3],[4],[5]			30
Virginia Electric and Power Company
Operating Activities
Net income		1,149	1,282	1,540
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)		1,392	1,309	1,333
Deferred income taxes and investment tax credits		(80)	224	269
Proceeds from assignment of tower rental portfolio				91
Impairment of assets and other charges		624
Charge related to a voluntary retirement program		116
Provision for rate credits to customers			77
Charge (revision) for future ash pond and landfill closure costs		(113)	81
Other adjustments		(86)	(21)	(36)
Changes in:
Accounts receivable		(196)	(60)	(27)
Affiliated receivables and payables		75	(14)	125
Inventories		(56)	13	3
Deferred fuel and purchased gas costs, net		243	(269)	(59)
Prepayments		1	(1)	3
Accounts payable		(31)	(26)	(42)
Accrued interest, payroll and taxes		5	(8)	17
Net realized and unrealized changes related to derivative activities		21	119	13
Asset retirement obligations		51	(54)	(88)
Other operating assets and liabilities		(331)	188	(181)
Net cash provided by operating activities		2,784	2,840	2,961
Investing Activities
Plant construction and other property additions		(2,642)	(2,228)	(2,496)
Purchases of nuclear fuel		(157)	(173)	(192)
Acquisition of solar development projects		(182)	(141)	(41)
Proceeds from sales of securities		858	887	849
Purchases of securities		(905)	(925)	(884)
Other		(37)	(63)	(41)
Net cash used in investing activities		(3,065)	(2,643)	(2,805)
Financing Activities
Issuance (repayment) of short-term debt, net		(71)	(228)	477
Repayment of credit facility borrowings		(113)
Issuance and remarketing of long-term debt		1,248	1,300	1,500
Issuance (repayment) of affiliated current borrowings, net		(117)	191	(229)
Repayment and repurchase of long-term debt (including redemption premiums)		(591)	(964)	(681)
Common dividend payments		(190)	(464)	(1,199)
Other		(12)	(18)	(11)
Net cash provided by (used in) financing activities		267	(183)	(143)
Increase (decrease) in cash, restricted cash and equivalents		(14)	14	13
Cash, restricted cash and equivalents at beginning of year		38	24	11
Cash, restricted cash and equivalents at end of year		24	38	24
Supplemental Cash Flow Information
Interest and related charges, excluding capitalized amounts		495	498	458
Income taxes		272	128	362
Significant noncash investing and financing activities:
Accrued capital expenditures	[1]	292	204	169
Leases	[1],[7]	55
Dominion Energy Gas Holdings, LLC
Operating Activities
Net income including noncontrolling interests		842	656	829
Net income		721	481	703
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization		445	424	328
Deferred income taxes and investment tax credits		(3)	380	(19)
Impairment of assets and other charges		13	385	15
Charge related to a voluntary retirement program		20
Gains on sales of assets and equity method investments		(7)	(109)	(70)
Other adjustments		69	21	14
Changes in:
Accounts receivable		69	(101)	(4)
Affiliated receivables and payables		(51)	(310)	26
Inventories		(50)	(28)	(5)
Prepayments		59	(23)	(20)
Accounts payable		(109)	1	(7)
Accrued interest, payroll and taxes		(52)	22	26
Pension and other postretirement benefits		(142)	(153)	(143)
Other operating assets and liabilities		(37)	30	(13)
Net cash provided by operating activities		1,066	1,195	957
Investing Activities
Plant construction and other property additions		(704)	(1,109)	(1,815)
Loan to Dominion Energy		(1,757)
Loan to Dominion Energy from Cove Point			(2,986)
Repayment of affiliated notes receivable, net		647		32
Proceeds from assignment of shale development rights			109	70
Other		(22)	(20)	(27)
Net cash used in investing activities		1,150	(4,006)	(1,740)
Financing Activities
Issuance (repayment) of short-term debt, net		52	(619)	169
Credit facility borrowings (repayments)			73
Repayment of credit facility borrowings		(73)
Issuance and remarketing of long-term debt		1,500	3,750
Issuance of affiliated long-term debt		395
Issuance (repayment) of affiliated current borrowings, net		(2,837)	291	628
Repayment and repurchase of long-term debt (including redemption premiums)		(3,750)	(255)
Repayment of affiliated long-term debt		(395)
Net proceeds from sale of Dominion Energy Midstream Common Units		0	4	18
Contributions from Dominion Energy		3,385	25	25
Dividends and distributions		(636)	(296)	(121)
Other		(16)	(21)
Net cash provided by (used in) financing activities		(2,375)	2,952	719
Increase (decrease) in cash, restricted cash and equivalents		(159)	141	(64)
Cash, restricted cash and equivalents at beginning of year		198	57	121
Cash, restricted cash and equivalents at end of year		39	198	57
Supplemental Cash Flow Information
Interest and related charges, excluding capitalized amounts		291	162	55
Income taxes		65	79	11
Significant noncash investing and financing activities:
Accrued capital expenditures	[8],[9]	25	59	69
Equity contributions from Dominion Energy	[8],[9]	0	$ 23	$ 26
Finance leases	[8],[9]	6
Dominion Energy Gas Holdings, LLC | East Ohio Gas [Member]
Investing Activities
Loan to Dominion Energy		(115)
Repayment of loan		115
Dominion Energy Gas Holdings, LLC | Cove Point [Member]
Investing Activities
Repayment of loan		$ 2,986
[1]	See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.
[2]	See Note 3 for noncash investing and financing activities related to the SCANA Combination.
[3]	See Note 5 for noncash activities related to the sale of a noncontrolling interest in Cove Point.
[4]	See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler.
[5]	See Notes 18,19 and 20 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream, the remarketing of RSNs, the issuance of stock purchase contracts associated with the 2019 Equity Units and the contribution of stock to Dominion Energy’s qualified defined benefit pension plan.
[6]	Includes $113 million of finance leases and $44 million of operating leases.
[7]	Includes $20 million of finance leases and $35 million of operating leases.
[8]	See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for lease arrangements.
[9]	See Notes 3 and 25 for noncash investing and financing activities related to the Dominion Energy Gas Restructuring and related-party transactions.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Financing leases	$ 113
Operating leases	44
Dominion Energy Gas Holdings, LLC
Financing leases	20
Operating leases	$ 35

Nature of Operations

Nature of Operations	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	Note 1. Nature Of Operations Dominion Energy, headquartered in Richmond, Virginia, is one of the nation’s largest producers and transporters of energy. Dominion Energy’s operations are conducted through various subsidiaries, including Virginia Power and Dominion Energy Gas. Dominion Energy’s operations also include DESC, an equity investment in Atlantic Coast Pipeline and regulated gas distribution operations primarily in the eastern and Rocky Mountain regions of the U.S. Dominion Energy’s nonregulated operations include merchant generation and retail energy marketing operations. See Note 3 for a description of operations acquired in the SCANA Combination. Beginning December 2019, Dominion Energy manages its daily operations through five primary operating segments: Dominion Energy Virginia, Gas Transmission & Storage, Gas Distribution, Dominion Energy South Carolina and Contracted Generation. Dominion Energy also reports a Corporate and Other segment, which includes its corporate, service company and other functions (including unallocated debt). In addition, Corporate and Other includes specific items attributable to Dominion Energy’s operating segments that are not included in profit measures evaluated by executive management in assessing the segments’ performance or in allocating resources. Virginia Power is a regulated public utility that generates, transmits and distributes electricity for sale in Virginia and northeastern North Carolina. Virginia Power is a member of PJM, an RTO, and its electric transmission facilities are integrated into the PJM wholesale electricity markets. All of Virginia Power’s stock is owned by Dominion Energy. Beginning in December 2019, Virginia Power manages its daily operations through one primary operating segment: Dominion Energy Virginia. It also reports a Corporate and Other segment that primarily includes specific items attributable to its operating segment that are not included in profit measures evaluated by executive management in assessing the segment’s performance or in allocating resources. Dominion Energy Gas is a holding company that conducts business activities through FERC-regulated interstate natural gas transmission pipeline and underground storage systems in the eastern and Rocky Mountain regions of the U.S., as well as the Cove Point LNG Facility. In addition, Dominion Energy Gas owns a 50% noncontrolling interest in both Iroquois and White River Hub. See Note 3 for more information on the Dominion Energy Gas Restructuring. All of Dominion Energy Gas’ membership interests are held by Dominion Energy. Beginning in December 2019, Dominion Energy Gas manages its daily operations through one primary operating segment: Gas Transmission & Storage. It also reports a Corporate and Other segment that primarily includes specific items attributable to its operating segment that are not included in profit measures evaluated by executive management in assessing the segment’s performance or in allocating resources and the effect of certain items recorded at Dominion Energy Gas as a result of Dominion Energy’s basis in the net assets contributed. In addition, Corporate and Other includes the net impact of discontinued operations, which is discussed in Note 3. See Note 26 for further discussion of the Companies’ operating segments.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	Note 2. Significant Accounting Policies General The Companies make certain estimates and assumptions in preparing their Consolidated Financial Statements in accordance with GAAP. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues, expenses and cash flows for the periods presented. Actual results may differ from those estimates. The Companies’ Consolidated Financial Statements include, after eliminating intercompany transactions and balances, their accounts, those of their respective majority-owned subsidiaries and non-wholly-owned 25 are The Companies report certain contracts, instruments and investments at fair value. See Note 6 for further information on fair value measurements. The Companies consider acquisitions or dispositions in which substantially all of the fair value of the gross assets acquired or disposed of is concentrated into a single identifiable asset or group of similar identifiable assets to be an acquisition or a disposition of an asset, rather than a business. See Notes 3 and 10 for further information on such transactions. Dominion Energy maintains pension and other postretirement benefit plans. Virginia Power and Dominion Energy Gas participate in certain of these plans. See Note 22 for further information on these plans. Certain amounts in the Companies’ 2018 and 2017 Consolidated Financial Statements and Notes have been reclassified to conform to the 2019 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows. Amounts disclosed for Dominion Energy are inclusive of Virginia Power and/or Dominion Energy Gas, where applicable. Operating Revenue Operating revenue is recorded on the basis of services rendered, commodities delivered, or contracts settled and includes amounts yet to be billed to customers. Dominion Energy and Virginia Power collect sales, consumption and consumer utility taxes and Dominion Energy Gas collects sales taxes; however, these amounts are excluded from revenue. Dominion Energy’s customer receivables at December 31, 2019 and 2018 included $896 million and $626 million, respectively, of accrued unbilled revenue based on estimated amounts of electricity and natural gas delivered but not yet billed to its utility customers. Virginia Power’s customer receivables at December 31, 2019 and 2018 included $512 million and $392 million, respectively, of accrued unbilled revenue based on estimated amounts of electricity delivered but not yet billed to its customers. Dominion Energy Gas’ customer receivables at December 31, 2019 and 2018 included $104 million and $101 million, respectively, of accrued unbilled revenue based on estimated amounts of natural gas delivered but not yet billed to its customers. See Note 25 for amounts attributable to related parties. The primary types of sales and service activities reported as operating revenue for Dominion Energy, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales • Nonregulated electric sales • Regulated gas sales • Nonregulated gas sales • Regulated gas transportation and storage sales • Nonregulated gas transportation and storage sales • Other regulated revenue • Other nonregulated revenue Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales • Nonregulated electric sales • Regulated gas sales • Nonregulated gas sales • Gas transportation and storage sales • Other revenue The primary types of sales and service activities reported as operating revenue for Virginia Power, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales • Other regulated revenue • Other nonregulated revenue non-jurisdictional Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Virginia Power, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated gas sales—wholesale • Nonregulated gas sales • Regulated gas transportation and storage sales • Nonregulated gas transportation and storage sales • Management service revenue • Other regulated revenue • Other nonregulated revenue Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated gas sales • Nonregulated gas sales • Gas transportation and storage sales • Other revenue O perating revenue for East Ohio and DGP consists primarily of state-regulated natural gas sales and related distribution services, state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of NGL gathering and processing activities, and is included in net income from discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income through November 6, 2019. Dominion Energy and Virginia Power record refunds to customers as required by state commissions as a reduction to regulated electric sales or regulated gas sales, as applicable. Dominion Energy and Virginia Power’s revenue accounted for under the alternative revenue program guidance primarily consists of the equity return for under-recovery of certain riders. Alternative revenue programs compensate Dominion Energy and Virginia Power for certain projects and initiatives. Revenues arising from these programs are presented separately from revenue arising from contracts with customers in the categories above. Revenues from electric and gas sales are recognized over time, as the customers of the Companies consume gas and electricity as it is delivered. Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. LNG terminalling services are also stand-ready service contracts, primarily consisting of fixed fees, offset by service credits associated with the start-up Dominion Energy and Dominion Energy Gas typically receive or retain NGLs and natural gas from customers when providing natural gas processing, transportation or storage services. Dominion Energy and Dominion Energy Gas record the fair value of NGLs received during natural gas processing as service revenue recognized over time, and continue to recognize revenue from the subsequent sale of the NGLs to customers upon delivery. Dominion Energy and Dominion Energy Gas typically retain natural gas under certain transportation service arrangements that are intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the allowance is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue. Credit Risk Credit risk is the risk of financial loss if counterparties fail to perform their contractual obligations. In order to minimize overall credit risk, credit policies are maintained, including the evaluation of counterparty financial condition, collateral requirements and the use of standardized agreements that facilitate the netting of cash flows associated with a single counterparty. In addition, counterparties may make available collateral, including letters of credit or cash held as margin deposits, as a result of exceeding agreed-upon credit limits, or may be required to prepay the transaction. The Companies maintain a provision for credit losses based on factors surrounding the credit risk of their customers, historical trends and other information. Management believes, based on credit policies and the December 31, 2019 provision for credit losses, that it is unlikely that a material adverse effect on financial position, results of operations or cash flows would occur as a result of counterparty nonperformance. Effective January 2020, expected credit losses will be estimated and recorded based on historical experience, current conditions and reasonable and supportable forecasts that affect the collectability of financial assets held at amortized cost as well as expected credit losses on commitments with respect to financial guarantees. Electric Fuel, Purchased Energy and Purchased Gas-Deferred Where permitted by regulatory authorities, the differences between Dominion Energy and Virginia Power’s actual electric fuel and purchased energy expenses and Dominion Energy and Dominion Energy Gas’ purchased gas expenses and the related levels of recovery for these expenses in current rates are deferred and matched against recoveries in future periods. The deferral of costs in excess of current period fuel rate recovery is recognized as a regulatory asset, while rate recovery in excess of current period fuel expenses is recognized as a regulatory liability. Of the cost of fuel used in electric generation and energy purchases to serve Virginia utility customers, at December 31, 2019, approximately 84% is subject to Virginia Power’s deferred fuel accounting, while substantially all of the remaining amount is subject to recovery through similar mechanisms. Virtually all of East Ohio, Questar Gas, Hope, DESC and PSNC’s natural gas purchases are either subject to deferral accounting or are recovered from the customer in the same accounting period as the sale. Income Taxes A consolidated federal income tax return is filed for Dominion Energy and its subsidiaries, including Virginia Power and Dominion Energy Gas’ subsidiaries. In addition, where applicable, combined income tax returns for Dominion Energy and its subsidiaries are filed in various states; otherwise, separate state income tax returns are filed. Although Dominion Energy Gas and certain of its subsidiaries are disregarded for income tax purposes, a provision for income taxes is recognized to reflect the inclusion of its business activities in the tax returns of its parent, Dominion Energy. Virginia Power and Dominion Energy Gas participate in intercompany tax sharing agreements with Dominion Energy and its subsidiaries. Current income taxes are based on taxable income or loss and credits determined on a separate company basis. Under the agreements, if a subsidiary incurs a tax loss or earns a credit, recognition of current income tax benefits is limited to refunds of prior year taxes obtained by the carryback of the net operating loss or credit or to the extent the tax loss or credit is absorbed by the taxable income of other Dominion Energy consolidated group members. Otherwise, the net operating loss or credit is carried forward and is recognized as a deferred tax asset until realized. The 2017 Tax Reform Act included a broad range of tax reform provisions affecting the Companies, including changes in corporate tax rates and business deductions. The 2017 Tax Reform Act reduces the corporate income tax rate from 35% to 21% for tax years beginning after December 31, 2017. Deferred tax assets and liabilities are classified as noncurrent in the Consolidated Balance Sheets and measured at the enacted tax rate expected to apply when temporary differences are realized or settled. Thus, at the date of enactment, federal deferred taxes were remeasured based upon the new 21% tax rate. The total effect of tax rate changes on deferred tax balances was recorded as a component of the income tax provision related to continuing operations for the period in which the law is enacted, even if the assets and liabilities relate to other components of the financial statements, such as items of accumulated other comprehensive income. For Dominion Energy subsidiaries that are not rate-regulated utilities, existing deferred income tax assets or liabilities were adjusted for the reduction in the corporate income tax rate and allocated to continuing operations. Dominion Energy’s rate-regulated utility subsidiaries likewise were required to adjust deferred income tax assets and liabilities for the change in income tax rates. However, if it is probable that the effect of the change in income tax rates will be recovered or refunded in future rates, the regulated utility recorded a regulatory asset or liability instead of an increase or decrease to deferred income tax expense. Accounting for income taxes involves an asset and liability approach. Deferred income tax assets and liabilities are provided, representing future effects on income taxes for temporary differences between the bases of assets and liabilities for financial reporting and tax purposes. Accordingly, deferred taxes are recognized for the future consequences of different treatments used for the reporting of transactions in financial accounting and income tax returns. The Companies establish a valuation allowance when it is more-likely-than-not The Companies recognize positions taken, or expected to be taken, in income tax returns that are more-likely-than-not If it is not more-likely-than-not The Companies recognize interest on underpayments and overpayments of income taxes in interest expense and other income, respectively. Penalties are also recognized in other income. Interest expense for the Companies was immaterial in 2019 and 2018. Dominion Energy and Virginia Power both recognized interest income of $11 million in 2017. Dominion Energy Gas’ interest was immaterial in 2017. The Companies’ penalties were immaterial in 2019, 2018 and 2017. At December 31, 2019, Virginia Power had an income tax-related In addition, Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 included $10 million of state income taxes receivable. State income taxes receivable at Virginia Power were immaterial at December 31, 2019. At December 31, 2018, Virginia Power had an income tax-related In addition, Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 included $15 million of state income taxes receivable. State income taxes receivable at Virginia Power were immaterial at December 31, 2018. Investment tax credits are recognized by nonregulated operations in the year qualifying property is placed in service. For regulated operations, investment tax credits are deferred and amortized over the service lives of the properties giving rise to the credits. Production tax credits are recognized as energy is generated and sold. Cash, Restricted Cash and Equivalents Cash, restricted cash and equivalents include cash on hand, cash in banks and temporary investments purchased with an original maturity of three months or less. Current banking arrangements generally do not require checks to be funded until they are presented for payment. The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies: At December 31, 2019 2018 (millions) Dominion Energy $ 29 $ 35 Virginia Power 9 16 Dominion Energy Gas 6 7 Restricted Cash and Equivalents The Companies hold restricted cash and equivalent balances that primarily consist of amounts held for litigation settlements, customer deposits and future debt payments on SBL Holdco and Dominion Solar Projects III, Inc.’s term loan agreements and on Eagle Solar’s senior note agreement. The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within the Companies’ Consolidated Balance Sheets to the corresponding amounts reported within the Companies’ Consolidated Statements of Cash Flows for the years ended December 31, 2019, 2018 and 2017: Cash, Restricted Cash and Equivalents at December 31, December 31, December 31, December 31, (millions) Dominion Energy Cash and cash equivalents $166 $268 $120 $261 Restricted cash and equivalents (1) 103 123 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $269 $391 $185 $322 Virginia Power Cash and cash equivalents $ 17 $ 29 $ 14 $ 11 Restricted cash and equivalents (1) 7 9 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 24 $ 38 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents (2) $ 27 $108 $ 18 $ 76 Restricted cash and equivalents (1) 12 90 39 45 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $198 $ 57 $121 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. (2) At December 31, 2018, 2017 and 2016, Dominion Energy Gas had $9 million, $3 million and $14 million of cash and cash equivalents included in current assets of discontinued operations, respectively. Distributions from Equity Method Investees Dominion Energy and Dominion Energy Gas each hold investments that are accounted for under the equity method of accounting. Dominion Energy and Dominion Energy Gas classify distributions from equity method investees as either cash flows from operating activities or cash flows from investing activities in the Consolidated Statements of Cash Flows according to the nature of the distribution. Distributions received are classified on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment (classified as cash flows from operating activities) or a return of an investment (classified as cash flows from investing activities) when such information is available to Dominion Energy and Dominion Energy Gas. Derivative Instruments The Companies are exposed to the impact of market fluctuations in the price of electricity, natural gas and other energy-related products they market and purchase, as well as interest rate and foreign currency exchange rate risks of their business operations. Dominion Energy uses derivative instruments such as physical and financial forwards, futures, swaps, options and FTRs to manage the commodity, interest rate and foreign currency exchange rate risks of its business operations. Virginia Power uses derivative instruments such as physical and financial forwards, futures, swaps, options and FTRs to manage commodity and interest rate risks. Dominion Energy Gas uses derivative instruments such as physical and financial forwards, futures and swaps to manage commodity, interest rate and foreign currency exchange rate risks. All derivatives, except those for which an exception applies, are required to be reported in the Consolidated Balance Sheets at fair value. Derivative contracts representing unrealized gain positions and purchased options are reported as derivative assets. Derivative contracts representing unrealized losses and options sold are reported as derivative liabilities. One of the exceptions to fair value accounting, normal purchases and normal sales, may be elected when the contract satisfies certain criteria, including a requirement that physical delivery of the underlying commodity is probable. Expenses and revenues resulting from deliveries under normal purchase contracts and normal sales contracts, respectively, are included in earnings at the time of contract performance. The Companies do not offset amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. Dominion Energy had margin assets of $42 million and $95 million associated with cash collateral at December 31, 2019 and 2018, respectively. Dominion Energy’s margin liabilities of $2 million and less than $1 million associated with cash collateral at December 31, 2019 and 2018, respectively. Virginia Power had margin assets of less than $1 million associated with cash collateral at December 31, 2019. Virginia Power had no margin assets associated with cash collateral at December 31, 2018 and no margin liabilities associated with cash collateral at December 31, 2019 and 2018. Dominion Energy Gas had no margin assets or liabilities associated with cash collateral at December 31, 2019 and 2018. See Note 7 for further information about derivatives. To manage price risk, the Companies hold derivative instruments that are not designated as hedges for accounting purposes. However, to the extent the Companies do not hold offsetting positions for such derivatives, they believe these instruments represent economic hedges that mitigate their exposure to fluctuations in commodity prices. All income statement activity, including amounts realized upon settlement, is presented in operating revenue, operating expenses, interest and related charges or other income based on the nature of the underlying risk. Changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities for jurisdictions subject to cost-based rate regulation. Realized gains or losses on the derivative instruments are generally recognized when the related transactions impact earnings. Derivative Instruments Designated as Hedging Instruments In accordance with accounting guidance pertaining to derivatives and hedge accounting, the Companies designate a portion of their derivative instruments as either cash flow or fair value hedges for accounting purposes. For derivative instruments that are accounted for as cash flow hedges or fair value hedges, the cash flows from the derivatives and from the related hedged items are classified in operating cash flows. Cash Flow Hedges Dominion Energy entered into interest rate derivative instruments to hedge its forecasted interest payments related to planned debt issuances in 2014. These interest rate derivatives were designated by Dominion Energy as cash flow hedges prior to the formation of Dominion Energy Gas. For the purposes of the Dominion Energy Gas financial statements, the derivative balances, AOCI balance, and any income statement impact related to these interest rate derivative instruments entered into by Dominion Energy have been, and will continue to be, included in the Dominion Energy Gas’ Consolidated Financial Statements as the forecasted interest payments related to the debt issuances now occur at Dominion Energy Gas. Fair Value Hedges Property, Plant and Equipment Property, plant and equipment is recorded at lower of original cost or fair value, if impaired. Capitalized costs include labor, materials and other direct and indirect costs such as asset retirement costs, capitalized interest and, for certain operations subject to cost-of-service In 2019, 2018 and 2017, Dominion Energy capitalized interest costs and AFUDC to property, plant and equipment of $89 million, $134 million and $236 million, respectively. In 2019, 2018 and 2017, Virginia Power capitalized AFUDC to property, plant and equipment of $34 million, $56 million and $37 million, respectively. In 2019, 2018 and 2017, Dominion Energy Gas capitalized AFUDC to property, plant and equipment of $31 million, $25 million and $34 million, respectively. Under Virginia law, certain Virginia jurisdictional projects qualify for current recovery of AFUDC through rate adjustment clauses. AFUDC on these projects is calculated and recorded as a regulatory asset and is not capitalized to property, plant and equipment. In 2019, 2018 and 2017, Virginia Power recorded $11 million, $4 million and $22 million of AFUDC related to these projects, respectively. For property subject to cost-of-service cost-of-service plant-in-service In 2019, Virginia Power had the following charges, primarily recorded in impairment of assets and other charges in the Consolidated Statements of Income (reflected in the Corporate and Other segment), related to early retirements: • In January 2019, Virginia Power committed to a plan to retire certain automated metering reading infrastructure associated with its electric operations before the end of its estimated useful life and replace such equipment with more current AMI technology. As a result, Virginia Power recorded a charge of $160 million ($119 million after-tax). • In March 2019, Virginia Power committed to retire certain electric generating units before the end of their useful lives and completed the retirement of certain units at six facilities representing 1,292 MW of electric generating capacity, which had previously been placed in cold reserve. An additional unit at Possum Point power station will be retired after it meets its capacity obligation to PJM in 2021. As a result, Virginia Power recorded a charge of $346 million ($257 million after-tax • In May 2019, Virginia Power abandoned a coal rail project at its Mt. Storm generating facility. As a result, Virginia Power recorded a charge of $62 million ($46 million after-tax). • In September 2019, Dominion Energy and Virginia Power abandoned certain property, plant and equipment before the end of its useful life. As a result, Dominion Energy recorded a charge of $26 million ($19 million after-tax) after-tax). For property that is not subject to cost-of-service Depreciation of property, plant and equipment is computed on the straight-line method based on projected service lives. The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows: Year Ended December 31, 2019 2018 2017 (percent) Dominion Energy Generation 2.84 2.71 2.94 Transmission 2.47 2.54 2.55 Distribution 2.80 2.97 3.00 Storage 2.40 2.40 2.48 General and other 4.04 4.20 4.38 Virginia Power Generation 2.94 2.71 2.94 Transmission 2.54 2.52 2.54 Distribution 3.14 3.31 3.32 General and other 4.40 4.52 4.68 Dominion Energy Gas (1) Transmission 2.43 2.66 2.67 Storage 2.53 2.42 2.51 General and other 4.59 4.18 5.08 (1) Excludes rates for depreciation reported as discontinued operations. Virginia Power expects to receive an updated depreciation study for its nuclear plants in the first quarter of 2020, which is anticipated to reflect lower depreciation rates as a result of expected approval of license extensions from the NRC. In 2018, Virginia Power revised depreciation rates for regulated nuclear plants to comply with Virginia Commission requirements. For the year ended December 31, 2018, this adjustment resulted in a decrease of $60 million ($44 million after-tax) after-tax). In 2017, Virginia Power revised the depreciation rates for its assets to reflect the results of a new depreciation study. This change resulted in an increase in annual depreciation expense of $40 million ($25 million after-tax) after-tax) Virginia Power’s non-jurisdictional property, plant and equipment is depreciated using the straight-line method over an estimated useful life of 30 years. Capitalized costs of development wells and leaseholds are amortized on a field-by-field unit-of-production Dominion Energy’s nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives: Asset Estimated Useful Lives Merchant generation-nuclear 44 years Merchant generation-other 15-30 Nonutility gas gathering and processing 3-50 LNG facility 40 years General and other 5-59 Depreciation and amortization related to Virginia Power and Dominion Energy Gas’ nonutility property, plant and equipment and exploration and production properties was immaterial for the years ended December 31, 2019, 2018 and 2017, except for Dominion Energy Gas’ nonutility LNG facility which is depreciated using the straight-line method over an estimated useful life of 40 years. Nuclear fuel used in electric generation is amortized over its estimated service life on a units-of-production Long-Lived and Intangible Assets The Companies perform an evaluation for impairment whenever events or changes in circumstances indicate that the carrying amount of long-lived assets or intangible assets with finite lives may not be recoverable. A long-lived or intangible asset is written down to fair value if the sum of its expected future undiscounted cash flows is less than its carrying amount. Intangible assets with finite lives are amortized over their estimated useful lives. See Note 6 for further discussion on the impairment of long-lived assets. Regulatory Assets and Liabilities The accounting for the Companies’ regulated electric and gas operations differs from the accounting for nonregulated operations in that the Companies are required to reflect the effect of rate regulation in their Consolidated Financial Statements. For regulated businesses subject to federal or state cost-of-service The Companies evaluate whether or not recovery of its regulatory assets through future rates is probable as well as whether a regulatory liability due to customers is probable and makes various assumptions in its analyses. These analyses are generally based on: • Orders issued by regulatory commissions, legislation and judicial actions; • Past experience; • Discussions with applicable regulatory authorities and legal counsel; • Forecasted earnings; and • Considerations around the likelihood of impacts from events such as unusual weather conditions, extreme weather events and other natural disasters and unplanned outages of facilities. Generally, regulatory assets and liabilities are amortized into income over the period authorized by the regulator. If recovery of a regulatory asset is determined to be less than probable, it will be written off in the period such assessment is made. A regulatory liability, if considered probable, will be recorded in the period such assessment is made or reversed into earnings if no longer probable. See Notes 12 and 13 to the Consolidated Financial Statements for additional information Leases The Companies lease certain assets including vehicles, real estate, office equipment and other operational assets under both operating and finance leases. For the Companies’ operating leases, rent expense is recognized on a straight-line basis over the term of the lease agreement, subject to regulatory framework. Rent expense associated with operating leases, short-term leases and variable leases is primarily recorded in other operations and maintenance expense in the Companies’ Consolidated Statements of Income. Rent expense associated with finance leases results in the separate presentation of interest expense on the lease liability and amortization expense of the related right-of-use Certain of the Companies’ leases include one or more options to renew, with renewal terms that can extend the lease from one right-of-use The determination of the discount rate utilized has a significant impact on the calculation of the present value of the lease liability included in the Companies’ Consolidated Balance Sheets. For the Companies’ fleet of leased vehicles, the discount rate is equal to the prevailing borrowing rate earned by the lessor. For the Companies’ remaining leased assets, the discount rate implicit in the lease is generally unable to be determined from a lessee perspective. As such, the Companies use internally-developed incremental borrowing rates as a discount rate in the calculation of the present value of the lease liability. The incremental borrowing rates are determined based on an analysis of the Companies’ publicly available unsecured borrowing rates, adjusted for a collateral discount, over various lengths of time that most closely correspond to the Companies’ lease maturities. In addition, Dominion Energy acts as lessor under certain power purchase agreements in which the counterparty or counterparties purchase substantially all of the output of certain solar facilities. These leases are considered operating in nature. For such leasing arrangements, rental revenue and an associated accounts receivable are recorded when the monthly output of the solar facility is determined. Depreciation on these solar facilities is computed on a straight-line basis over an estimated useful life of 30 years. Asset Retiremen

Acquisitions And Dispositions

Acquisitions And Dispositions	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Acquisitions And Dispositions	Note 3. Acquisitions And Dispositions Dominion Energy Acquisition of SCANA In January 2019, Dominion Energy issued 95.6 million shares of Dominion Energy common stock, valued at $6.8 billion, representing 0.6690 of a share of Dominion Energy common stock for each share of SCANA common stock, in connection with the completion of the SCANA Combination. SCANA, through its regulated subsidiaries, is primarily engaged in the generation, transmission and distribution of electricity in the central, southern and southwestern portions of South Carolina and in the distribution of natural gas in North Carolina and South Carolina. In addition, at the closing of the SCANA Combination, SCANA marketed natural gas to retail customers in the southeast U.S. Following completion of the SCANA Combination, SCANA operates as a wholly-owned subsidiary of Dominion Energy. In addition, SCANA’s debt totaled $6.9 billion at closing. The SCANA Combination expanded Dominion Energy’s portfolio of regulated electric generation, transmission and distribution and regulated natural gas distribution infrastructure operations. Merger Approval and Conditions Merger Approval The SCANA Combination required approval of SCANA’s shareholders, FERC, the North Carolina Commission, the South Carolina Commission, the Georgia Public Service Commission and the NRC and clearance from the Federal Trade Commission under the Hart-Scott-Rodino Act. All such approvals were received prior to closing of the SCANA Combination. Various parties filed petitions for rehearing or reconsideration of the SCANA Merger Approval Order. In January 2019, the South Carolina Commission issued an order (1) granting the request of various parties and finding that DESC was imprudent in its actions by not disclosing material information to the South Carolina Office of Regulatory Staff and the South Carolina Commission with regard to costs incurred subsequent to March 2015 and (2) denying the petitions for rehearing or consideration as to other issues raised in the various petitions. The deadline to appeal the SCANA Merger Approval Order and the order on rehearing expired in April 2019, and no party has sought appeal. Refunds to Customers As a condition to the SCANA Merger Approval Order, DESC will provide refunds and restitution of $2.0 billion over 20 years with capital support from Dominion Energy. In September and October 2017, DESC received proceeds totaling $1.1 billion in full satisfaction of its share of a settlement agreement among DESC, Santee Cooper and Toshiba Corporation in connection with Westinghouse and WECTEC, both wholly-owned subsidiaries of Toshiba Corporation and responsible for the engineering and construction of the NND Project, filing for bankruptcy. The purchase price allocation below includes a previously established regulatory liability at DESC totaling $1.1 billion, of which $67 million was considered current, associated with the monetization of the bankruptcy settlement with Toshiba Corporation. In accordance with the terms of the SCANA Merger Approval Order, this regulatory liability, net of amounts that may be required to satisfy any liens against NND Project property, totaling $1.0 billion will be refunded to DESC electric service customers over a 20-year Additionally, in the first quarter of 2019, DESC recorded a reduction in operating revenue and a corresponding regulatory liability of $1.0 billion, of which $137 million was considered current, representing a refund of amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year after-tax NND Project As a condition to the SCANA Merger Approval Order, DESC committed to excluding from rate recovery $2.4 billion of costs related to the NND Project and $180 million of costs associated with the purchase of the Columbia Energy Center power station. Regulatory assets included in SCANA’s historical balance sheet at December 31, 2018 reflected these disallowances. The remaining regulatory asset associated with the NND Project of $2.8 billion, of which $138 million was considered current, will be collected over a 20-year Other Terms and Conditions • DESC will not file an application for a general rate case with the South Carolina Commission with a requested effective date earlier than January 2021; • PSNC will not file an application for a general rate case with the North Carolina Commission with a requested effective date earlier than April 2021; • Dominion Energy has committed to increasing SCANA’s historical level of corporate contributions to charities by $1 million per year over five years; • Dominion Energy will maintain DESC and PSNC’s headquarters in Cayce, South Carolina and Gastonia, North Carolina, respectively; and • Dominion Energy will seek to minimize reductions in local employment by allowing some DES employees supporting shared and common services functions and activities to be located in Cayce, South Carolina where it makes economic and practical sense to do so. Purchase Price Allocation SCANA’s assets acquired and liabilities assumed have been measured at estimated fair value at closing and are included in the Dominion Energy South Carolina, Gas Transmission & Storage and Gas Distribution operating segments. The majority of the operations acquired are subject to the rate setting authority of FERC and the North and South Carolina Commissions and are therefore accounted for pursuant to ASC 980, Regulated Operations The fair value of SCANA’s assets acquired and liabilities assumed that are not subject to the rate-setting provisions discussed above and the fair values of SCANA’s investments accounted for under the equity method have been determined using the income approach and the market approach. The valuation of SCANA’s long-term debt is considered a Level 2 fair value measurement. All other valuations are considered Level 3 fair value measurements due to the use of significant judgmental and unobservable inputs, including projected timing and amount of future cash flows and discount rates reflecting risk inherent in the future market prices. The excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed is reflected as goodwill. The goodwill reflects the value associated with enhancing Dominion Energy’s portfolio of regulated operations in the growing southeast region of the U.S. The goodwill recognized is not deductible for income tax purposes, and as such, no deferred taxes have been recorded related to goodwill. The table below shows the allocation of the purchase price to the assets acquired and liabilities assumed at closing, which reflects certain adjustments related to income taxes, as discussed in Note 5, from the preliminary valuation recognized during the measurement period. Amount (millions) Total current assets (1) $ 1,782 Investments (2) 224 Property, plant and equipment (3)(4) 11,006 Goodwill 2,609 Regulatory assets (5) 3,940 Other deferred charges and other assets, including intangible assets (6) 430 Total Assets 19,991 Total current liabilities (7) 1,556 Long-term debt 6,707 Deferred income taxes 1,068 Regulatory liabilities 2,706 Other deferred credits and other liabilities (8) 1,115 Total Liabilities 13,152 Total purchase price (9) $ 6,839 (1) Includes $389 million of cash, restricted cash and equivalents, of which $115 million is considered restricted. (2) Includes $31 million for equity method investments. The fair value adjustment on the equity method investments is considered to be equity method goodwill and is not amortized. ( 3 Includes $105 million of certain property, plant and equipment associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. As a result, Dominion Energy’s Consolidated Statements of Income for the year ended December 31, 2019 include a charge of $105 million ($79 million after-tax), ( 4 Nonregulated property, plant and equipment, excluding land, will be depreciated on a straight-line basis over the remaining useful lives of such property, primarily ranging from 5 to 78 years. ( 5 Includes $258 million of certain income tax-related ( 6 Intangible assets have an estimated weighted-average amortization period of approximately five years. ( 7 Includes $40 million outstanding under letters of credit advances, which were repaid in January 2019, as well as $173 million outstanding commercial paper under various credit facilities. As discussed in Note 17, all credit facilities were terminated in 2019. ( 8 Includes a $379 million pension and other postretirement benefit liability. ( 9 Includes stock-based compensation awards with a fair value of $21 million. Results of Operations and Unaudited Pro Forma Information The impact of the SCANA Combination on Dominion Energy’s operating revenue and net income attributable to Dominion Energy in the Consolidated Statements of Income was an increase of $3.1 billion and a decrease of $1.1 billion for the year ended December 31, 2019, respectively. Dominion Energy incurred merger and integration-related costs of $646 million in the Consolidated Statements of Income for the year ended December 31, 2019. The amount for the year ended December 31, 2019 includes $427 million for a charge related to a voluntary retirement program. See Note 22 for additional information. Of the remaining merger and integration-related costs, $210 million was recorded in other operations and maintenance expense and $9 million was recorded in interest and related charges in the Consolidated Statements of Income for the year ended December 31, 2019. During the year ended December 31, 2018, Dominion Energy incurred merger and integration-related costs of $27 million, recorded primarily in other operations and maintenance expense in the Consolidated Statements of Income. These costs consist of professional fees, the charitable contribution commitment described above, employee-related expenses, certain financing costs and other miscellaneous costs. The following unaudited pro forma financial information reflects the consolidated results of operations of Dominion Energy assuming the SCANA Combination had taken place on January 1, 2018. The unaudited pro forma financial information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the future consolidated results of operations of the combined company. Twelve 2019 (1) 2018 (1) (millions, except EPS) Operating Revenue $ 17,579 $ 17,505 Net income attributable to Dominion Energy 3,266 2,081 Earnings Per Common Share – Basic $ 4.04 $ 2.78 Earnings Per Common Share – Diluted $ 4.00 $ 2.77 (1) Amounts include adjustments for non-recurring Sale of Interest In Cove Point In October 2019, Dominion Energy signed an agreement to sell the 25% noncontrolling limited partnership interests in Cove Point not contributed to Dominion Energy Gas in the Dominion Energy Gas Restructuring to Brookfield. In December 2019, the sale was completed and Dominion Energy received cash consideration of $2.1 billion, subject to working capital adjustments. The sale was accounted for by Dominion Energy following the guidance for a change in a parent company’s ownership interest in a consolidated subsidiary. Because Dominion Energy controls Cove Point both before and after the sale of the noncontrolling interest, the changes in Dominion Energy’s ownership interest in Cove Point was accounted for as an equity transaction and no gain or loss was recognized. Acquisitions of Wholly-Owned Merchant Solar Projects The following table presents significant completed acquisitions of wholly-owned merchant solar projects by Dominion Energy. Completed Acquisition Seller Number of Project Location Project Name(s) Initial (1) Project (2) Date of MW February 2017 Community Energy Solar, LLC 1 Virginia Amazon Solar Farm Virginia—Southhampton $ 29 $ 205 December 2017 100 March 2017 Solar Frontier Americas Holding LLC 1 (3) California Midway II 77 78 June 2017 30 May 2017 Cypress Creek Renewables, LLC 1 North Carolina IS37 154 160 June 2017 79 June 2017 Hecate Energy Virginia C&C LLC 1 Virginia Clarke County 16 16 August 2017 10 June 2017 Strata Solar Development, LLC/Moorings Farm 2 Holdco, LLC 2 North Carolina Fremont, Moorings 2 20 20 November 2017 10 September 2017 Hecate Energy Virginia C&C LLC 1 Virginia Cherrydale 40 41 November 2017 20 October 2017 Strata Solar Development, LLC 2 North Carolina Clipperton, Pikeville 20 21 November 2017 10 (1) The purchase price was primarily allocated to property, plant and equipment. (2) Includes acquisition cost. (3) In April 2017, Dominion Energy discontinued efforts on the acquisition of the additional 20 MW solar project from Solar Frontier Americas Holding LLC. In addition during 2016, Dominion Energy acquired 100% of the equity interests of seven solar projects in Virginia, North Carolina and South Carolina for an aggregate purchase price of $32 million, all of which was allocated to property, plant and equipment. The projects cost $421 million in total, including initial acquisition costs, and generate 221 MW combined. One of the projects commenced commercial operations in 2016 and the remaining projects commenced commercial operations in 2017. Long-term power purchase, interconnection and operation and maintenance agreements have been executed for all of the projects described above. These projects are included in Contracted Generation. Dominion Energy has claimed federal investment tax credits on these solar projects. Dominion Energy Gas Dominion Energy Gas Restructuring The Dominion Energy Gas Restructuring is considered to be a reorganization of entities under common control. As a result, Dominion Energy Gas’ basis in DCP and DMLPHCII, which includes the general partner of Dominion Energy Midstream, a controlling 75% interest in Cove Point, DECG, Dominion Energy Questar Pipeline, a 50% noncontrolling interest in White River Hub and a 25.93% noncontrolling interest in Iroquois, is equal to Dominion Energy’s cost basis in the assets and liabilities of such entities since the applicable inception dates of common control. In November 2019, following completion of the Dominion Energy Gas Restructuring, DCP and DMLPHCII are wholly-owned subsidiaries of Dominion Energy Gas and therefore are consolidated by Dominion Energy Gas. The accompanying Consolidated Financial Statements and Notes of Dominion Energy Gas have been retrospectively adjusted to include the historical results and financial position of DCP and DMLPHCII. The 25% interest in Cove Point retained by Dominion Energy, and subsequently sold to Brookfield in December 2019, and the non-Dominion The Dominion Energy Gas Restructuring includes the disposition of East Ohio and DGP by Dominion Energy Gas in November 2019. This restructuring represents a strategic shift in the operations of Dominion Energy Gas as Dominion Energy Gas’ operations consist s The following table represents selected information regarding the results of operations of East Ohio, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income: Period Ended Year Ended Year Ended (millions) Operating revenue $ 594 $ 729 $ 728 Depreciation and amortization 73 76 71 Other operating expenses 399 444 428 Other income 61 72 50 Interest and related charges 33 37 33 Income tax expense 26 53 86 Net income from discontinued operations 124 191 160 The carrying amounts of major classes of assets and liabilities relating to East Ohio, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets were as follows: At December 31, 2018 (millions) Current assets of discontinued operations (1) $ 423 Investments 2 Property, plant and equipment, net 3,669 Regulatory assets 711 Other deferred charges and other assets, including goodwill and intangible assets 1,275 Noncurrent assets of discontinued operations 5,657 Current liabilities of discontinued operations 1,262 Long-term debt 1,300 Deferred income taxes and investment tax credits 716 Regulatory liabilities 747 Other deferred credits and liabilities 108 Noncurrent liabilities of discontinued operations 2,871 (1) Includes cash and cash equivalents of $9 million as of December 31, 2018. Capital expenditures and significant noncash items relating to East Ohio included the following: Period Ended Year Ended Year Ended (millions) Capital expenditures $ 299 $ 352 $ 348 Significant noncash items : Charge related to a voluntary retirement program 20 — — Accrued capital expenditures 2 5 8 The following table represents selected information regarding the results of operations of DGP, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income: Period Ended Year Ended Year Ended (millions) Operating revenue $ 125 $ 220 $ 114 Depreciation and amortization 4 15 15 Impairment of assets and related charges — 219 — Other operating expenses 97 206 91 Income tax expense (benefit) 7 (53 ) 5 Net income (loss) from discontinued operations $ 17 $ (167 ) $ 3 The carrying amounts of major classes of assets and liabilities relating to DGP, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets were as follows: At December 31, 2018 (millions) Current assets of discontinued operations (1) $ 21 Noncurrent assets of discontinued operations (2) 192 Current liabilities of discontinued operations 11 Noncurrent liabilities of discontinued operations 25 (1) Includes cash and cash equivalents of less than $1 million. (2) Primarily property, plant and equipment, net. Capital expenditures and significant noncash items of DGP included the following: Period Ended Year Ended Year Ended (millions) Capital expenditures $ 11 $ 6 $ 8 Significant noncash : Impairment of assets and related charges — (219 ) —

Operating Revenue

Operating Revenue	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Operating Revenue	Note 4. Operating Revenue The Companies’ operating revenue, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, consists of the following: Year Ended December 31, 2019 2018 (millions) Dominion Energy Regulated electric sales: Residential $ 4,325 $ 3,413 Commercial 3,219 2,503 Industrial 683 490 Government and other retail 873 854 Wholesale 176 137 Nonregulated electric sales 926 1,294 Regulated gas sales: Residential 1,343 818 Commercial 457 221 Other 117 36 Nonregulated gas sales 496 214 Regulated gas transportation and storage: FERC-regulated 1,057 1,091 State-regulated 742 640 Nonregulated gas transportation and storage 676 442 Other regulated revenues 259 179 Other nonregulated revenues (1)(2) 415 563 Total operating revenue from contracts with customers 15,764 12,895 Other revenues (2)(3) 808 471 Total operating revenue $ 16,572 $ 13,366 Virginia Power Regulated electric sales: Residential $ 3,657 $ 3,413 Commercial 2,712 2,503 Industrial 455 490 Government and other retail 823 854 Wholesale 128 137 Other regulated revenues 190 132 Other nonregulated revenues (1)(2) 71 55 Total operating revenue from contracts with customers 8,036 7,584 Other revenues (1)(3) 72 35 Total operating revenue $ 8,108 $ 7,619 Dominion Energy Gas Regulated gas sales—wholesale $ 9 $ 25 Nonregulated gas sales (1) 6 7 Regulated gas transportation and storage 1,300 1,249 Nonregulated gas transportation and storage 676 442 Management service revenue (1) 162 257 Other regulated revenues (1 )(2 ) 7 19 Other nonregulated revenues (1 )(2 ) 5 3 Total operating revenue from contracts with customers 2,165 2,002 Other revenues 4 (6 ) Total operating revenue $ 2,169 $ 1,996 (1) See Notes 9 and 25 for amounts attributable to related parties and affiliates. (2) Amounts above include sales which are considered to be goods transferred at a point in time. For the years ended December 31, 2019 and 2018, such amounts included $171 million and $241 million, respectively, at Dominion Energy and $5 million and $10 million, respectively, at Dominion Energy Gas, primarily consisting of NGL sales. Additionally, amounts above include sales of renewable energy credits. For the years ended December 31, 2019 and 2018, such sales were $24 million and $ 17 million, respectively, at Dominion Energy and $17 million and $11 million, respectively, at Virginia Power. (3) Includes alternative revenue of $66 million and $52 million for the year ended December 31, 2019 at Dominion Energy and Virginia Power, respectively, and $15 million for year ended December 31, 2018 at both Dominion Energy and Virginia Power. The table below discloses the aggregate amount of the transaction price allocated to fixed-price performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period and when the Companies expect to recognize this revenue. These revenues relate to contracts containing fixed prices where the Companies will earn the associated revenue over time as they stand ready to perform services provided. This disclosure does not include revenue related to performance obligations that are part of a contract with original durations of one year or less. In addition, this disclosure does not include expected consideration related to performance obligations for which the Companies elect to recognize revenue in the amount they have a right to invoice. Revenue expected to be recognized on multi-year contracts in place at December 31, 2019 2020 2021 2022 2023 2024 Thereafter Total (millions) Dominion Energy $ 1,569 $ 1,470 $ 1,363 $ 1,216 $ 1,104 $ 12,519 $ 19,241 Virginia Power 3 1 — — — — 4 Dominion Energy Gas 1,723 1,624 1,495 1,325 1,185 12,783 20,135 Contract assets represent an entity’s right to consideration in exchange for goods and services that the entity has transferred to a customer. At December 31, 2019 and 2018, Dominion Energy’s contract asset balances were $28 million and $42 million, respectively. Dominion Energy Gas’ contract asset balances were $40 million and $58 million at December 31, 2019 and 2018 respectively. Dominion Energy and Dominion Energy Gas’ contract assets are recorded in other deferred charges and other assets in the Consolidated Balance Sheets. Contract liabilities represent an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration, or the amount that is due, from the customer. At December 31, 2019 and 2018, Dominion Energy’s contract liability balances were $123 million and $106 million, respectively. At December 31, 2019 and 2018, Virginia Power’s contract liability balances were $24 million and $22 million, respectively. At December 31, 2019 and 2018, Dominion Energy Gas’ contract liability balances were $20 million and $28 million, respectively. The Companies’ contract liabilities are recorded in other current liabilities and other deferred credits and other liabilities in the Consolidated Balance Sheets. The Companies’ recognize revenue as they fulfill their obligations to provide service to their customers. During both the years ended December 31, 2019 and 2018, Dominion Energy recognized revenue of $94 million from the beginning contract liability balance. During years ended December 31, 2019 and 2018 , The Companies’ operating revenue, prior to the adoption of revised guidance for revenue recognition from contracts with customers, consisted of the following: Year Ended December 31 2017 (millions) Dominion Energy Electric sales: Regulated $ 7,383 Nonregulated 1,429 Gas sales: Regulated 1,067 Nonregulated 457 Gas transportation and storage 1,786 Other 464 Total operating revenue $ 12,586 Virginia Power Regulated electric sales $ 7,383 Other 173 Total operating revenue $ 7,556 Dominion Energy Gas Gas sales: Regulated $ 6 Nonregulated 6 Gas transportation and storage 1,291 Other 220 Total operating revenue $ 1,523

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 5. Income Taxes Judgment and the use of estimates are required in developing the provision for income taxes and reporting of tax-related tax-related The 2017 Tax Reform Act included a broad range of tax reform provisions affecting the Companies as discussed in Note 2. The 2017 Tax Reform Act reduced the corporate income tax rate from 35% to 21% for tax years beginning after December 31, 2017. At the date of enactment, deferred tax assets and liabilities were remeasured based upon the new 21% enacted tax rate expected to apply when temporary differences are realized or settled. The specific provisions related to regulated public utilities in the 2017 Tax Reform Act generally allow for the continued deductibility of interest expense, changed the tax depreciation of certain property acquired after September 27, 2017, and continued certain rate normalization requirements for accelerated depreciation benefits. As indicated in Note 2, certain of the Companies’ operations, including accounting for income taxes, are subject to regulatory accounting treatment. For regulated operations, many of the changes in deferred taxes represent amounts probable of collection from or refund to customers, and were recorded as either an increase to a regulatory asset or liability. The 2017 Tax Reform Act included provisions that stipulate how these excess deferred taxes may be passed back to customers for certain accelerated tax depreciation benefits. Potential refunds of other deferred taxes may be determined by the Companies’ regulators. See Note 13 for more information. The Companies have accounted for the effects of the 2017 Tax Reform Act, although changes could occur as additional guidance is issued and finalized, particularly as it relates to the deductibility of interest expense in consolidated groups such as Dominion Energy. In addition, the major states in which the Companies operate have addressed conformity with some or all of the provisions of the 2017 Tax Reform Act, although some states have modified certain of these provisions. The changes in deferred taxes resulting from the 2017 Tax Reform Act, and the Companies’ interpretations of proposed regulations issued in 2018 on the applicability of accelerated depreciation, were recorded as either an increase to a regulatory liability or as an adjustment to the deferred tax provision. The impacts of proposed and final regulations issued in 2019 on the applicability of accelerated depreciation were immaterial at the Companies. Continuing Operations Details of income tax expense for continuing operations including noncontrolling interests were as follows: Dominion Energy Virginia Power Dominion Energy Gas Year Ended December 31, 2019 2018 2017 2019 2018 2017 2019 2018 2017 (millions) Current: Federal $ 32 $ (45 ) $ (1 ) $ 286 $ 36 $ 432 $ 130 $ (227 ) $ 75 State 103 108 (26 ) 58 40 73 17 31 13 Total current expense (benefit) 135 63 (27 ) 344 76 505 147 (196 ) 88 Deferred: Federal 2017 Tax Reform Act impact (1) — 46 (851 ) — 21 (93 ) — (6 ) (246 ) Taxes before operating loss carryforwards, investment tax credits and tax reform 182 436 739 (128 ) 199 319 (36 ) 343 88 Tax utilization expense (benefit) of operating loss carryforwards 119 92 174 — — 4 — — — Investment tax credits (51 ) (56 ) (200 ) (34 ) (51 ) (23 ) — — — State (93 ) (1 ) 132 22 55 59 (10 ) (17 ) 5 Total deferred expense (benefit) 157 517 (6 ) (140 ) 224 266 (46 ) 320 (153 ) Investment tax credit-gross deferral 62 2 5 62 2 5 — — — Investment tax credit-amortization (3 ) (2 ) (2 ) (2 ) (2 ) (2 ) — — — Total income tax expense (benefit) $ 351 $ 580 $ (30 ) $ 264 $ 300 $ 774 $ 101 $ 124 $ (65 ) (1) The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations. The 2017 Tax Reform Act reduced the statutory federal income tax rate to 21% beginning in January 2018. Accordingly, current and deferred income taxes are recorded at the new 21% rate. In 2019, the Dominion Energy Gas Restructuring caused changes in tax status at certain of its subsidiaries. The impacts of the changes in tax status decreased deferred income tax expense by $48 million at Dominion Energy and Dominion Energy Gas. In addition, Dominion Energy recognized a taxable gain resulting from the sale of a 25% noncontrolling interest in Cove Point. The direct tax effects of the transactions included a provision for current income taxes ($362 million) and an offsetting benefit for deferred income taxes ($147 million) and were charged to common shareholders’ equity. The utilization of $208 million federal tax credit carryforwards offsetting a portion of the federal tax liability from the transaction were also charged to common shareholders’ equity. In total, the taxes recorded in common shareholders’ equity resulting from this transaction were $215 million. In 2018, Dominion Energy had less than $1 million of state deferred income tax expense as a result of the reversal of deferred taxes upon the sale of its interest in Blue Racer and Fairless and Manchester. Dominion Energy’s current federal income taxes primarily include the recognition of a $47 million benefit related to a carryback claim for specified liability losses involving prior tax years. In 2017, the accounting for the reduction in the corporate income tax rate decreased deferred income tax expense by $851 million at Dominion Energy, $93 million at Virginia Power and $246 million for Dominion Energy Gas for the year ending December 31, 2017. The decrease in deferred income taxes at Dominion Energy primarily relates to the remeasurement of deferred taxes on nonregulated operations and includes the effects at Virginia Power and Dominion Energy Gas. Virginia Power and Dominion Energy Gas have certain regulatory assets and liabilities that have not yet been charged or returned to customers through rates, or on which they do not earn a return, including unrecognized pension and other postretirement benefits. The remeasurement of the deferred taxes on these regulatory balances was charged to continuing operations in 2017. For ratemaking purposes, Dominion Energy Gas’ subsidiary DETI follows the cash method on pension contributions. Deferred taxes recorded on pension balances as required by GAAP are not included as a component of rates and therefore the remeasurement of these deferred taxes were charged to continuing operations in 2017. Discontinued Operations—Dominion Energy Gas Tax expense reported in discontinued operations for the period ended November 6, 2019 was $33 million. Tax expense reported in discontinued operations for years ended December 31, 2018 and 2017 at Dominion Energy Gas was less than $1 million and $91 million, respectively. Tax expense for discontinued operations included benefits of utilizing an immaterial amount of operating loss carryforwards in 2018 and $5 million in 2017. Continuing Operations For continuing operations including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies’ effective income tax rate as follows: Dominion Energy Virginia Power Dominion Energy Gas Year Ended December 31, 2019 2018 2017 2019 2018 2017 2019 2018 2017 U.S. statutory rate 21.0 % 21.0 % 35.0 % 21.0 % 21.0 % 35.0 % 21.0 % 21.0 % 35.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 1.3 3.0 2.0 4.5 4.7 3.7 2.5 3.2 2.6 Investment tax credits (5.7 ) (1.9 ) (6.3 ) (2.9 ) (3.5 ) (0.8 ) — — — Production tax credits (1.1 ) (0.7 ) (0.7 ) (0.7 ) (0.7 ) (0.4 ) — — — Valuation allowances 0.1 0.3 0.2 — — — (0.2 ) — 0.3 Reversal of excess deferred income taxes (2.0 ) (2.0 ) — (3.1 ) (3.2 ) — (0.8 ) (0.6 ) — Federal legislative change — 1.5 (27.5 ) — 1.3 (4.0 ) — (0.5 ) (41.0 ) State legislative change — (0.6 ) — — — — — (2.0 ) (0.7 ) Write-off 10.9 — — — — — — — — Change in tax status (2.8 ) — — — — — (6.0 ) — — AFUDC—equity (1.8 ) (0.8 ) (1.4 ) — (0.5 ) (0.6 ) (0.5 ) (0.3 ) (0.9 ) Employee stock ownership plan deduction (0.7 ) (0.4 ) (0.6 ) — — — — — — Other, net 1.1 (0.9 ) (1.7 ) (0.2 ) (0.1 ) 0.6 (3.4 ) (1) (4.4 ) (1) (6.0 ) (1) Effective tax rate 20.3 % 18.5 % (1.0 )% 18.6 % 19.0 % 33.5 % 12.6 % 16.4 % (10.7 )% (1) Includes (3.2)%, (4.6)% and (6.7)% relating to the absence of tax on noncontrolling interest in 2019, 2018 and 2017, respectively. For the Companies’ rate-regulated entities, deferred taxes will reverse at the weighted average rate used to originate the deferred tax liability, which in some cases will be 35%. The Companies have recorded an estimate of excess deferred income tax amortization in 2019, and changes in estimates of amounts probable of collection from or return to customers. The reversal of these excess deferred income taxes will impact the effective tax rate, and may ultimately impact rates charged to customers. See Note 13 for current year developments. In connection with the SCANA Combination, Dominion Energy committed to forgo, or limit, the recovery of certain income tax-related In 2018, the Companies applied the provisions of proposed regulations addressing the availability of federal bonus depreciation for the period beginning after September 27, 2017 through December 31, 2017. The application of these changes increased Dominion Energy’s 2017 net operating loss carryforward, the benefit of which will be recognized at the 21% rate. As a result, Dominion Energy’s effective tax rate reflects a $23 million increase to deferred income tax expense associated with the remeasurement of this deferred tax asset. The application of these proposed regulations at Dominion Energy Gas had no impact on income tax expense as the changes in, and remeasurement of, deferred tax liabilities increased regulatory liabilities by $35 million, of which $23 million is reflected in noncurrent liabilities of discontinued operations on the Consolidated Balance Sheets. The effects of these changes at Virginia Power were immaterial. These amounts and adjustments represent the Companies’ best estimate based on available information, and could be subject to change based on additional guidance in yet to be finalized regulations. In addition, changes in estimates of amounts probable of return to or collection from customers increased deferred income tax expense at Virginia Power by $23 million and increased regulatory liabilities by $31 million. At Dominion Energy Gas similar changes in estimates decreased income tax expense by $5 million and regulatory liabilities by $8 million. In Dominion Energy Gas’ discontinued operations, similar changes in estimates increased income tax expense by $8 million, which is reflected in income tax expense from continuing operations in the Consolidated Statements of Income, and regulatory liabilities $10 million, which are reflected in noncurrent liabilities of discontinued operations on the Consolidated Balance Sheets. These changes also impacted Dominion Energy. In addition, Dominion Energy and Dominion Energy Gas’ effective tax rates reflect the impacts of a state legislative change enacted in the second quarter of 2018 that was retroactive to January 1, 2018. In 2017, the Companies’ effective tax rates reflect the net benefit of remeasurement of deferred taxes resulting from the lower corporate income tax rate promulgated by the 2017 Tax Reform Act, and the completion of audits by state tax authorities that resulted in the recognition of previously unrecognized tax benefits. At December 31, 2016, Virginia Power’s unrecognized tax benefits included state refund claims for open tax years through 2011. Management believed settlement of the claims, including interest thereon, within the next twelve months was remote. In June 2017, Virginia Power received and accepted a cash offer to settle the refund claims. As a result of the settlement, Virginia Power decreased its unrecognized tax benefits by $8 million, and recognized a $2 million tax benefit, which impacted its effective tax rate. Also in connection with this settlement, Virginia Power realized interest income of $11 million, which is reflected in other income in the Consolidated Statements of Income. The Companies’ deferred income taxes consist of the following: Dominion Energy Virginia Power Dominion Energy At December 31, 2019 2018 2019 2018 2019 2018 (millions) Deferred income taxes: Total deferred income tax assets $ 3,736 $ 2,748 $ 1,207 $ 1,054 $ 206 $ 296 Total deferred income tax liabilities 9,883 7,813 4,058 4,020 1,494 1,626 Total net deferred income tax liabilities $ 6,147 $ 5,065 $ 2,851 $2,966 $1,288 $ 1,330 Total deferred income taxes: Plant and equipment, primarily depreciation method and basis differences $ 6,616 $ 4,933 $ 3,359 $ 3,367 $ 742 $ 671 Excess deferred income taxes (1,306 ) (993 ) (672 ) (678 ) (149 ) (156 ) Unrecovered NND Project costs 553 — — — — — DESC rate refund (169 ) — — — — — Toshiba Settlement (219 ) — — — — — Nuclear decommissioning 909 815 290 273 — — Deferred state income taxes 863 626 302 284 199 203 Federal benefit of deferred state income taxes (184 ) (132 ) (63 ) (60 ) (42 ) (43 ) Deferred fuel, purchased energy and gas costs 30 60 1 59 — (1 ) Pension benefits 174 81 (153 ) (132 ) 154 134 Other postretirement benefits (37 ) (5 ) 62 55 (6 ) (3 ) Loss and credit carryforwards (1,832 ) (1,546 ) (280 ) (183 ) (1 ) (5 ) Valuation allowances 161 158 5 5 1 6 Partnership basis differences 823 1,135 — — 423 570 Other (235 ) (67 ) — (24 ) (33 ) (46 ) Total net deferred income tax liabilities $ 6,147 $ 5,065 $ 2,851 $2,966 $1,288 $ 1,330 Deferred Investment Tax Credits – Regulated Operations 130 51 111 51 — — Total Deferred Taxes and Deferred Investment Tax Credits $ 6,277 $ 5,116 $ 2,962 $3,017 $1,288 $ 1,330 The most significant impact reflected for the 2017 Tax Reform Act is the adjustment of the net accumulated deferred income tax liability for the reduction in the corporate income tax rate to 21%. In addition to amounts recognized in deferred income tax expense, the impacts of the 2017 Tax Reform Act decreased the accumulated deferred income tax liability by $3.1 billion at Dominion Energy, $1.9 billion at Virginia Power and $0.8 billion at Dominion Energy Gas at December 31, 2017, of which $0.4 billion is reflected in noncurrent liabilities of discontinued operations on the Consolidated Balance Sheets. At Dominion Energy, the December 31, 2017 balance sheet reflected the impact of the 2017 Tax Reform Act on our regulatory liabilities which increased our regulatory liabilities by $4.2 billion, and created a corresponding deferred tax asset of $1.1 billion. At Virginia Power, our regulatory liabilities increased $2.6 billion, and created a deferred tax asset of $0.7 billion. At Dominion Energy Gas, regulatory liabilities increased $1.1 billion, of which $0.5 billion is reflected in noncurrent liabilities of discontinued operations on the Consolidated Balance Sheets and created a deferred tax asset of $0.3 billion, of which $0.1 billion is reflected in noncurrent liabilities of discontinued operations on the Consolidated Balance Sheets. These adjustments had no impact on 2017 cash flows. At December 31, 2019, Dominion Energy had the following deductible loss and credit carryforwards: Deductible Deferred Valuation Expiration (millions) Federal losses $ 1,361 $ 286 $ — 2037 Federal investment credits — 922 — 2035-2039 Federal production credits — 126 — 2035-2039 Other federal credits — 40 — 2035-2038 State losses 3,074 173 (57 ) 2020-2038 State minimum tax credits — 165 — No expiration State investment and other credits — 144 (98 ) 2020-2031 Total $4,435 $ 1,856 $(155) At December 31, 2019, Virginia Power had the following deductible loss and credit carryforwards: Deductible Deferred Valuation Expiration (millions) Federal investment credits $ — $ 213 $ — 2035-2039 Federal production and other credits — 58 — 2035-2039 State investment credits — 9 (5 ) 2024 Total $ — $ 280 $ (5 ) At December 31, 2019, Dominion Energy Gas had immaterial deductible loss carryforwards and less than $1 million of credit carryforwards that expire between 2032 and 2037. A reconciliation of changes in the Companies’ unrecognized tax benefits follows: Dominion Energy Virginia Power Dominion Energy 2019 2018 2017 2019 2018 2017 2019 2018 2017 (millions) Balance at January 1 $ 44 $ 38 $ 64 $ 2 $ 4 $ 13 $2 $ 2 $9 Acquired unrecognized tax benefits 129 (1) — — — — — — — — Increases-prior period positions — 10 1 — — — — — — Decreases-prior period positions — — (9 ) — — (1 ) — — — Increases-current period positions 9 10 5 — — — — — — Settlements with tax authorities (7 ) (6 ) (23 ) (2 ) (1 ) (8 ) — — (7 ) Expiration of statutes of limitations — (8 ) — — (1 ) — — — — Balance at December 31 $ 175 $ 44 $ 38 $ — $ 2 $ 4 $2 $ 2 $2 (1) Acquired unrecognized tax benefits reflect $106 million plus increases in prior period positions of $76 million and decreases in prior period positions of $53 million that were recorded through purchase accounting. Certain unrecognized tax benefits, or portions thereof, if recognized, would affect the effective tax rate. Changes in these unrecognized tax benefits may result from remeasurement of amounts expected to be realized, settlements with tax authorities and expiration of statutes of limitations. For Dominion Energy and its subsidiaries, these unrecognized tax benefits were $141 million, $37 million and $31 million at December 31, 2019, 2018 and 2017, respectively. For Dominion Energy, the change in these unrecognized tax benefits increased income tax expense by $3 million and $5 million in 2019 and 2018, respectively, and decreased income tax expense by $9 million in 2017. For Virginia Power, these unrecognized tax benefits were less than $1 million, $2 million, and $3 million at December 31, 2019, 2018 and 2017, respectively. For Virginia Power, the change in these unrecognized tax benefits decreased income tax expense by $2 million in 2019 and 2018, respectively, and $6 million in 2017. For Dominion Energy Gas, these unrecognized tax benefits were $2 million, at December 31, 2019, 2018 and 2017, respectively. For Dominion Energy Gas, the change in these unrecognized tax benefits decreased income tax expense by less than $1 million in 2019 and 2018, respectively, and $5 million in 2017. Dominion Energy participates in the IRS Compliance Assurance Process which provides the opportunity to resolve complex tax matters with the IRS before filing its federal income tax returns, thus achieving certainty for such tax return filing positions agreed to by the IRS. In 2018, Dominion Energy submitted carryback claims for specified liability losses involving prior tax years. These claims are currently subject to IRS examination. With the exception of these claims, the IRS has completed its audit of tax years through 2018. The statute of limitations has not yet expired for tax year 2014 and years after 2015. Although Dominion Energy has not received a final letter indicating no changes to its taxable income for tax year 2018, no material adjustments are expected. The IRS examination of tax year 2019 is ongoing. It is reasonably possible that settlement negotiations and expiration of statutes of limitations could result in a decrease in unrecognized tax benefits in 2020 by up to $86 million for Dominion Energy and less than $1 million for Dominion Energy Gas. If such changes were to occur, other than revisions of the accrual for interest on tax underpayments and overpayments, earnings could increase by up to $23 million for Dominion Energy and less than $1 million for Dominion Energy Gas. Otherwise, with regard to 2019 and prior years, Dominion Energy, Virginia Power and Dominion Energy Gas cannot estimate the range of reasonably possible changes to unrecognized tax benefits that may occur in 2020. For each of the major states in which Dominion Energy operates, the earliest tax year remaining open for examination is as follows: State Earliest Pennsylvania (1) 2012 Connecticut 2016 Virginia (2) 2016 West Virginia (1) 2016 New York (1) 2015 Utah 2016 South Carolina 2012 (1) Considered a major state for Dominion Energy Gas’ operations. (2) Considered a major state for Virginia Power’s operations. The Companies are also obligated to report adjustments resulting from IRS settlements to state tax authorities. In addition, if Dominion Energy utilizes operating losses or tax credits generated in years for which the statute of limitations has expired, such amounts are generally subject to examination.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 6. Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. However, the use of a mid-market mid-point value measurements to certain assets and liabilities including commodity and interest rate derivative instruments and other investments including those held in the nuclear decommissioning trust, in accordance with the requirements discussed above. Dominion Energy Gas applies fair value measurements to certain assets and liabilities including commodity, interest rate, and foreign currency derivative instruments and other investments including those held in pension and other postretirement benefit plan trusts, in accordance with the requirements described above. The Companies apply credit adjustments to their derivative fair values in accordance with the requirements described above. Inputs and Assumptions Fair value is based on actively-quoted market prices, if available. In the absence of actively-quoted market prices, price information is sought from external sources, including industry publications, and to a lesser extent, broker quotes. When evaluating pricing information provided by Designated Contract Market settlement pricing, other pricing services, or brokers, the Companies consider the ability to transact at the quoted price, i.e. if the quotes are based on an active market or an inactive market and to the extent which pricing models are used, if pricing is not readily available. If pricing information from external sources is not available, or if the Companies believe that observable pricing is not indicative of fair value, judgment is required to develop the estimates of fair value. In those cases the unobservable inputs are developed and substantiated using historical information, available market data, third-party data, and statistical analysis. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party sources. For options and contracts with option-like characteristics where observable pricing information is not available from external sources, Dominion Energy and Virginia Power generally use a modified Black-Scholes Model that considers time value, the volatility of the underlying commodities and other relevant assumptions when estimating fair value. Dominion Energy and Virginia Power use other option models under special circumstances, including but not limited to Spread Approximation Model and a Swing Option Model. For contracts with unique characteristics, the Companies may estimate fair value using a discounted cash flow approach deemed appropriate in the circumstances and applied consistently from period to period. For individual contracts, the use of different valuation models or assumptions could have a significant effect on the contract’s estimated fair value. The inputs and assumptions used in measuring fair value include the following: For commodity derivative contracts: • Forward commodity prices • Transaction prices • Price volatility • Price correlation • Volumes • Commodity location • Interest rates • Credit quality of counterparties and the Companies • Credit enhancements • Time value For interest rate derivative contracts: • Interest rate curves • Credit quality of counterparties and the Companies • Notional value • Credit enhancements • Time value For foreign currency derivative contracts: • Foreign currency forward exchange rates • Interest rates • Credit quality of counterparties and the Companies • Notional value • Credit enhancements • Time value For investments: • Quoted securities prices and indices • Securities trading information including volume and restrictions • Maturity • Interest rates • Credit quality Levels The Companies also utilize the following fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels: • Level 1—Quoted prices (unadjusted) in active markets for identical assets and liabilities that they have the ability to access at the measurement date. Instruments categorized in Level 1 primarily consist of financial instruments such as certain exchange-traded derivatives, and exchange-listed equities, U.S. and international equity securities, mutual funds and certain Treasury securities held in nuclear decommissioning trust funds for Dominion Energy and Virginia Power, benefit plan trust funds for Dominion Energy and Dominion Energy Gas, and rabbi trust funds for Dominion Energy. • Level 2—Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 primarily include commodity forwards and swaps, interest rate swaps, foreign currency swaps and cash and cash equivalents, corporate debt instruments, government securities and other fixed income investments held in nuclear decommissioning trust funds for Dominion Energy and Virginia Power, benefit plan trust funds for Dominion Energy and Dominion Energy Gas and rabbi trust funds for Dominion Energy. • Level 3—Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability. Instruments categorized in Level 3 for the Companies consist of long-dated commodity derivatives, FTRs, certain natural gas and power options and other modeled commodity derivatives. The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. In these cases, the lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability. Alternative investments, consisting of investments in partnerships, joint ventures and other alternative investments held in nuclear decommissioning and benefit plan trust funds, are generally valued using NAV based on the proportionate share of the fair value as determined by reference to the most recent audited fair value financial statements or fair value statements provided by the investment manager adjusted for any significant events occurring between the investment manager’s and the Companies’ measurement date. Alternative investments recorded at NAV are not classified in the fair value hierarchy. Transfers out of Level 3 represent assets and liabilities that were previously classified as Level 3 for which the inputs became observable for classification in either Level 1 or Level 2. Because the activity and liquidity of commodity markets vary substantially between regions and time periods, the availability of observable inputs for substantially the full term and value of the Companies’ over-the-counter Level 3 Valuations The Companies enter into certain physical and financial forwards, futures, options and swaps, which are considered Level 3 as they have one or more inputs that are not observable and are significant to the valuation. The discounted cash flow method is used to value Level 3 physical and financial forwards and futures contracts. An option model is used to value Level 3 physical and financial options. The discounted cash flow model for forwards and futures calculates mark-to-market mark-to-market The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at December 31, 2019. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value Valuation Techniques Unobservable Input Range Weighted (1) Assets Physical and financial forwards: Natural gas (2) $ 13 Discounted cash flow Market price (per Dth) (3) (1) - — FTRs 6 Discounted cash flow Market price (per MWh) (3) (1) - 5 1 Total assets $ 19 Liabilities Physical and financial forwards: Natural gas (2) $ 43 Discounted cash flow Market price (per Dth) (3) (2) - 4 (1 ) FTRs 5 Discounted cash flow Market price (per MWh) (3) (4) - 4 — Physical options: Natural gas 8 Option model Market price (per Dth) (3) 1 - 4 3 Price volatility (4) 24% - 66% 37 % Total liabilities $ 56 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets. Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Position Change to Input Impact on Fair Market price Buy Increase (decrease) Gain (loss) Market price Sell Increase (decrease) Loss (gain) Price volatility Buy Increase (decrease) Gain (loss) Price volatility Sell Increase (decrease) Loss (gain) Nonrecurring Fair Value Measurements Dominion Energy See Note 9 for information regarding an impairment charge recognized associated with Dominion Energy’s equity method investment in Fowler Ridge. Also, see Note 9 for information regarding fair value measurements associated with Dominion Energy’s sale of its interest in Blue Racer and acquisition of its interest in Wrangler. Atlantic Coast Pipeline Guarantee Agreement In October 2017, Dominion Energy entered into a guarantee agreement in connection with Atlantic Coast Pipeline’s obligation under a $3.4 billion revolving credit facility. See Note 23 for more information about the guarantee agreement associated with Atlantic Coast Pipeline’s revolving credit facility. Dominion Energy recorded a liability of $30 million, the fair value of the guarantee at inception, associated with the guarantee agreement. The fair value was estimated using a discounted cash flow method and is considered a Level 3 fair value measurement due to the use of a significant unobservable input related to the interest rate differential between the interest rate charged on the guaranteed revolving credit facility and the estimated interest rate that would have been charged had the loan not been guaranteed. Dominion Energy Gas In the fourth quarter of 2018, subsequent to the announcement of the sale of Dominion Energy’s interest in Blue Racer, Dominion Energy Gas conducted a review of strategic alternatives of its remaining gathering and processing assets at DGP. Based on an evaluation of DGP’s long-lived assets for recoverability under a probability weighted approach, Dominion Energy Gas determined the assets were impaired. As a result of this evaluation, Dominion Energy Gas recorded a charge of $219 million ($165 million after-tax) the Statements of Income the Recurring Fair Value Measurements Fair value measurements are separately disclosed by level within the fair value hierarchy with a separate reconciliation of fair value measurements categorized as Level 3. Fair value disclosures for assets held in Dominion Energy and Dominion Energy Gas’ pension and other postretirement benefit plans are presented in Note 22. Dominion Energy The following table presents Dominion Energy’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Derivatives: Commodity $ — $ 55 $ 19 $ 74 Interest rate — 11 — 11 Foreign currency — 8 — 8 Investments (1) Equity securities: U.S. 4,195 — — 4,195 Fixed income: Corporate debt instruments — 463 — 463 Government securities 473 719 — 1,192 Cash equivalents and other 19 1 — 20 Total assets $ 4,687 $ 1,257 $ 19 $ 5,963 Liabilities Derivatives: Commodity $ — $ 75 $ 56 $ 131 Interest rate — 606 — 606 Foreign currency — 3 — 3 Total liabilities $ — $ 684 $56 $ 740 December 31, 2018 Assets Derivatives: Commodity $ — $ 180 $ 70 $ 250 Interest rate — 18 — 18 Foreign currency — 26 — 26 Investments (1) Equity securities: U.S. 3,277 — — 3,277 Fixed income: Corporate debt instruments — 431 — 431 Government securities 455 688 — 1,143 Cash equivalents and other 11 — — 11 Total assets $ 3,743 $ 1,343 $ 70 $ 5,156 Liabilities Derivatives: Commodity $ — $ 129 $ 6 $ 135 Interest rate — 142 — 142 Foreign currency — 2 — 2 Total liabilities $ — $ 273 $ 6 $ 279 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $274 million and $220 million of assets at December 31, 2019 and 2018, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. The following table presents the net change in Dominion Energy’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category: 2019 2018 2017 (millions) Balance at January 1, $ 64 $ 150 $ 139 Total realized and unrealized gains (losses): Included in earnings: Operating Revenue (1 ) (2 ) 3 Electric fuel and other energy-related purchases (22 ) (15 ) (42 ) Purchased gas 2 — 1 Included in other comprehensive income (loss) — 1 (2 ) Included in regulatory assets/liabilities (90 ) (44 ) 42 Settlements 17 (27 ) 6 Purchases (10 ) — — Sales 6 — — Transfers out of Level 3 (3 ) 1 3 Balance at December 31, $ (37 ) $ 64 $ 150 The amount of total gains (losses) for the period included in earnings Operating Revenue $ — $ — $ 2 VIRGINIA POWER The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at December 31, 2019. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value Valuation Techniques Unobservable Input Range Weighted (1) Assets Physical and financial forwards: Natural gas (2) $ 13 Discounted cash flow Market price (per Dth) (3) (1) - — FTRs 6 Discounted cash flow Market price (per MWh) (3) (1) - 1 Total assets $ 19 Liabilities Physical and financial forwards: Natural gas (2) $ 43 Discounted cash flow Market price (per Dth) (3) (2) - (1 ) FTRs 5 Discounted cash flow Market price (per MWh) (3) (4) - — Physical options: Natural gas 8 Option model Market price (per Dth) (3) 1 - 4 3 Price volatility (4) 24%—66% 37 % Total liabilities $ 56 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets. Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Position Change to Input Impact on Fair Market price Buy Increase (decrease) Gain (loss) Market price Sell Increase (decrease) Loss (gain) Price volatility Buy Increase (decrease) Gain (loss) Price volatility Sell Increase (decrease) Loss (gain) The following table presents Virginia Power’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Derivatives: Commodity $ — $ 3 $19 $ 22 Interest rate — 2 — 2 Investments (1) Equity securities: U.S. 1,920 — — 1,920 Fixed income: Corporate debt instruments — 256 — 256 Government securities 186 361 — 547 Cash equivalents and other — 1 — 1 Total assets $ 2,106 $623 $19 $ 2,748 Liabilities Derivatives: Commodity $ — $ 47 $56 $ 103 Interest rate — 363 — 363 Total liabilities $ — $410 $56 $ 466 December 31, 2018 Assets Derivatives: Commodity $ — $ 24 $66 $ 90 Interest rate — 3 — 3 Investments (1) Equity securities: U.S. 1,476 — — 1,476 Fixed income: Corporate debt instruments — 221 — 221 Government securities 164 343 — 507 Total assets $ 1,640 $591 $66 $ 2,297 Liabilities Derivatives: Commodity $ — $ 9 $ 6 $ 15 Interest rate — 88 — 88 Total liabilities $ — $ 97 $ 6 $ 103 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $159 million and $160 million of assets at December 31, 2019 and 2018, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. The following table presents the net change in Virginia Power’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category: 2019 2018 2017 (millions) Balance at January 1, $ 60 $ 147 $ 143 Total realized and unrealized gains (losses): Included in earnings: Electric fuel and other energy-related purchases (22 ) (17 ) (43 ) Included in regulatory assets/liabilities (88 ) (45 ) 40 Settlements 13 (25 ) 7 Balance at December 31, $ (37 ) $ 60 $ 147 There were no unrealized gains and losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date for the years ended December 31, 2019, 2018 and 2017. Dominion Energy Gas The following table presents Dominion Energy Gas’ assets and liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Foreign currency $ — $8 $ — $8 Total assets $ — $8 $ — $8 Liabilities Interest rate $ — $83 $ — $83 Foreign currency — 3 — 3 Total liabilities $ — $86 $ — $86 December 31, 2018 Assets Commodity $ — $3 $ — $3 Interest rate — 2 — 2 Foreign currency — 26 — 26 Total assets $ — $31 $ — $31 Liabilities Interest rate $ — $17 $ — $17 Foreign currency — 2 — 2 Total liabilities $ — $ 19 $ — $ 19 The following table presents the net change in Dominion Energy Gas’ derivative assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category. There were no changes in assets and liabilities measure at fair value on a recurring basis and included in the Level 3 fair value category during the year ended December 31, 2019. 2018 2017 (millions) Balance at January 1, $(2 ) $(2 ) Total realized and unrealized gains (losses): Included in other comprehensive income (loss) 1 (3 ) Transfers out of Level 3 1 3 Balance at December 31, $— $(2 ) There were no gains and losses included in earnings in the Level 3 fair value category for the years ended December 31, 2019, 2018 and 2017. There were no unrealized gains and losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date for the years ended December 31, 2019, 2018 and 2017. Fair Value of Financial Instruments Substantially all of the Companies’ financial instruments are recorded at fair value, with the exception of the instruments described below, which are reported at historical cost. Estimated fair values have been determined using available market information and valuation methodologies considered appropriate by management. The carrying amount of cash, restricted cash and equivalents, customer and other receivables, affiliated receivables, short-term debt, affiliated current borrowings, payables to affiliates and accounts payable are representative of fair value because of the short-term nature of these instruments. For the Companies’ financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows: December 31, 2019 2018 Carrying Amount Estimated (1) Carrying Amount Estimated (1) (millions) Dominion Energy Long-term debt (2) $ 32,055 $36,155 $ 29,952 $31,045 Credit facility borrowings — — 73 73 Junior subordinated notes (3) 4,797 4,953 3,430 3,358 Remarketable subordinated notes (3) — — 1,386 1,340 Virginia Power Long-term debt (3) $ 12,326 $14,281 $ 11,671 $12,400 Dominion Energy Gas Long-term debt (4) $ 5,520 $5,738 $ 7,770 $7,803 Credit facility borrowings — — 73 73 (1) Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value. (2) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At December 31, 2019 and 2018, includes the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt of $4 million and $(20) million, respectively. (3) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium. (4) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.

Derivatives and Hedge Accountin

Derivatives and Hedge Accounting Activities	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedge Accounting Activities	Note 7. Derivatives And Hedge Accounting Activities See Note 2 for the Companies’ accounting policies, objectives, and strategies for using derivative instruments. See Note 6 for further information about fair value measurements and associated valuation methods for derivatives. Derivative assets and liabilities are presented gross on the Companies’ Consolidated Balance Sheets. Dominion Energy’s derivative contracts include both over-the-counter over-the-counter Over-the-counter over-the-counter In general, most over-the-counter over-the-counter Balance Sheet Presentation The tables below present Dominion Energy’s derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset Gross Amounts Not Offset Gross Assets (1) Financial Cash Net Gross Assets (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $35 $21 $— $14 $175 $12 $— $163 Exchange 37 21 — 16 68 68 — — Interest rate contracts: Over-the-counter 11 3 — 8 18 1 — 17 Foreign currency contracts: Over-the-counter 8 8 — — 26 2 — 24 Total derivatives, subject to a master netting or similar arrangement $91 $53 $— $38 $287 $83 $— $204 (1) Excludes $2 million and $7 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements. December 31, 2019 December 31, 2018 Gross Amounts Not Gross Amounts Not Gross Liabilities (1) Financial Cash Net Gross Liabilities (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $105 $21 $— $ 84 $ 19 $12 $— $ 7 Exchange 21 21 — — 115 68 47 — Interest rate contracts: Over-the-counter 606 8 35 563 142 1 — 141 Foreign currency contracts: Over-the-counter 3 3 — — 2 2 — — Total derivatives, subject to a master netting or similar arrangement $735 $53 $35 $647 $278 $83 $47 $148 (1) Excludes $5 million and $1 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements. Volumes The following table presents the volume of Dominion Energy’s derivative activity as of December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 79 34 Basis 227 495 Electricity (MWh): Fixed price (1) 3,810,015 — FTRs 46,585,304 — Liquids (Gal) (2) 52,374,000 — Interest rate (3) $ 2,450,000,000 $ 3,976,014,497 Foreign currency (3) — € 250,000,000 € (1) Includes options. (2) Includes NGLs. (3) Maturity is determined based on final settlement period. AOCI The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy’s Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected to be After-Tax Maximum Term (millions) Commodities: Gas $ (4 ) $ (4 ) 24 months Electricity 19 19 12 months Other 1 1 12 months Interest rate (426 ) (64 ) 384 months Foreign currency 3 (2 ) 78 months Total $ (407 ) $ (50 ) The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., anticipated sales) in earnings, thereby achieving the realization of prices contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in market prices, interest rates and foreign currency exchange rates. Fair Value Hedges For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings and presented in the same line item. Gains and losses on derivatives in fair value hedge relationships were immaterial for the years ended December 31, 2019, 2018 and 2017. The following table presents the amounts recorded on the balance sheet related to cumulative basis adjustments for fair value hedges: Carrying Amount of the Hedged Asset (Liability) (1) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (2) December 31, December 31, December 31, December 31, (millions) Long-term $ (1,154 ) $ (1,631 ) $ (4 ) $20 (1) Includes $(397) million and $(892) million related to discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively. (2) Includes $3 million and $8 million of hedging adjustments on discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively. Fair Value and Gains and Losses on Derivative Instruments The following tables present the fair values of Dominion Energy’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Fair Value – Total (millions) At December 31, 2019 ASSETS Current Assets Commodity $ 30 $37 $ 67 Interest rate 1 — 1 Total current derivative assets (1) 31 37 68 Noncurrent Assets Commodity 1 6 7 Interest rate 10 — 10 Foreign currency 8 — 8 Total noncurrent derivative assets (2) 19 6 25 Total derivative assets $ 50 $43 $ 93 LIABILITIES Current Liabilities Commodity $ 6 $77 $ 83 Interest rate 321 1 322 Foreign currency 3 — 3 Total current derivative liabilities (3) 330 78 408 Noncurrent Liabilities Commodity 1 47 48 Interest rate 267 17 284 Total noncurrent derivative liabilities (4) 268 64 332 Total derivative liabilities $598 $142 $ 740 At December 31, 2018 ASSETS Current Assets Commodity $ 55 $154 $ 209 Interest rate 14 — 14 Total current derivative assets (1) 69 154 223 Noncurrent Assets Commodity 6 35 41 Interest rate 4 — 4 Foreign currency 26 — 26 Total noncurrent derivative assets (2) 36 35 71 Total derivative assets $105 $189 $ 294 LIABILITIES Current Liabilities Commodity $ 17 $112 $ 129 Interest rate 26 — 26 Foreign currency 2 — 2 Total current derivative liabilities (3) 45 112 157 Noncurrent Liabilities Commodity 5 1 6 Interest rate 116 — 116 Total noncurrent derivative liabilities (4) 121 1 122 Total derivative liabilities $166 $113 $ 279 (1) Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets. (3) Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets. (4) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets. The following tables present the gains and losses on Dominion Energy’s derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) (1) Amount of Gain (Loss) Increase (2) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Commodity: Operating revenue $146 Purchased gas (3 ) Total commodity $125 $143 $ — Interest rate (3) (252 ) (54 ) (255 ) Foreign currency (4) (18 ) (6 ) — Total $(145 ) $ 83 $(255 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Commodity: Operating revenue $(90 ) Electric fuel and other energy-related purchases 14 Total commodity $ 64 $(76 ) $ — Interest rate (3) (18 ) (48 ) 39 Foreign currency (4) (6 ) (13 ) — Total $ 40 $(137 ) $ 39 Year Ended December 31, 2017 Derivative type and location of gains (losses): Commodity: Operating revenue $ 81 Purchased gas (2 ) Total commodity $ 1 $ 79 $ — Interest rate (3) (8 ) (52 ) (58 ) Foreign currency (4) 18 20 — Total $ 11 $ 47 $ (58 ) (1) Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income. (3) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income. Derivatives not designated as hedging instruments Amount of Gain (Loss) Recognized in (1) Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ 45 $ (28 ) $ 18 Purchased gas (28 ) 11 (3 ) Electric fuel and other energy-related purchases (46 ) (9 ) (59 ) Other operations & maintenance — — (1 ) Interest rate 3 — — Total $ (26 ) $ (26 ) $ (45 ) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income. Virginia Power Balance Sheet Presentation The tables below present Virginia Power’s derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Gross Amounts Not Offset in the Gross Assets (1) Financial Cash Net Gross Assets (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $19 $18 $— $1 $64 $6 $— $58 Interest rate contracts: Over-the-counter 2 — — 2 3 — — 3 Total derivatives, subject to a master netting or similar arrangement $21 $18 $— $3 $67 $6 $— $61 (1) Excludes $3 million and $26 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements. December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Gross Amounts Not Offset in the Gross Liabilities (1) Financial Cash Net Gross Liabilities (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $ 59 $18 $— $ 41 $ 6 $6 $— $— Interest rate contracts: Over-the-counter 363 — — 363 88 — — 88 Total derivatives, subject to a master netting or similar arrangement $422 $18 $— $404 $94 $6 $— $88 (1) Excludes $44 million and $9 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements. Volumes The following table presents the volume of Virginia Power’s derivative activity at December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 41 9 Basis 132 448 Electricity (MWh): FTRs 46,585,304 — Interest rate (2) $ 900,000,000 $ 950,000,000 (1) Includes options. (2) Maturity is determined based on final settlement period. AOCI The following table presents selected information related to losses on cash flow hedges included in AOCI in Virginia Power’s Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected to be After-Tax Maximum (millions) Interest rate $ (34 ) $ (1 ) 384 months Total $ (34 ) $ (1 ) The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., interest payments) in earnings, thereby achieving the realization of interest rates contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in interest rates. Fair Value and Gains and Losses on Derivative Instruments The following tables present the fair values of Virginia Power’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Fair Value – Total (millions) At December 31, 2019 ASSETS Current Assets Commodity $ — $ 20 $ 20 Total current derivative assets (1) — 20 20 Noncurrent Assets Commodity — 2 2 Interest rate 2 — 2 Total noncurrent derivative assets (2) 2 2 4 Total derivative assets $ 2 $ 22 $ 24 LIABILITIES Current Liabilities Commodity $ — $ 58 $ 58 Interest rate 185 — 185 Total current derivative liabilities 185 58 243 Noncurrent Liabilities Commodity — 45 45 Interest rate 178 — 178 Total noncurrent derivatives liabilities (3) 178 45 223 Total derivative liabilities $363 $103 $ 466 At December 31, 2018 ASSETS Current Assets Commodity $ — $ 60 $ 60 Interest rate 3 — 3 Total current derivative assets (1) 3 60 63 Noncurrent Assets Commodity — 30 30 Total noncurrent derivative assets (2) — 30 30 Total derivative assets $ 3 $ 90 $ 93 LIABILITIES Current Liabilities Commodity $ — $ 15 $ 15 Interest rate 10 — 10 Total current derivative liabilities 10 15 25 Noncurrent Liabilities Interest rate 78 — 78 Total noncurrent derivative liabilities (3) 78 — 78 Total derivative liabilities $ 88 $ 15 $ 103 (1) Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets. (3) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets. The following tables present the gains and losses on Virginia Power’s derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging Amount of (1) Amount of Increase (2) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Interest rate (3) $(30 ) $(1 ) $(259 ) Total $(30 ) $(1 ) $(259 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Interest rate (3) $ 2 $(1 ) $ 39 Total $ 2 $(1 ) $ 39 Year Ended December 31, 2017 Derivative type and location of gains (losses): Interest rate (3) $ (8 ) $(1 ) $(58 ) Total $ (8 ) $(1 ) $(58 ) (1) Amounts deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (3) Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges. Derivatives not designated as hedging instruments Amount of Gain (Loss) (1) Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity (2) $ (45 ) $2 $(57) Total $ (45 ) $2 $(57) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in electric fuel and other energy-related purchases. Dominion Energy Gas Balance Sheet Presentation The tables below present Dominion Energy Gas’ derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Not Offset in the Consolidated Gross Assets Financial Cash Net Amounts Gross Assets Financial Cash Net (millions) Commodity contracts: Over-the-counter $ — $ — $ — $ — $ 3 $ — $ — $ 3 Interest rate contracts: Over-the-counter — — — — 2 — — 2 Foreign currency contracts: Over-the-counter 8 8 — — 26 2 — 24 Total derivatives, subject to a master netting or similar arrangement $ 8 $ 8 $ — $ — $ 31 $ 2 $ — $ 29 December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Not Offset in the Consolidated Gross Liabilities Financial Cash Net Gross Liabilities Financial Cash Net (millions) Interest rate contracts: Over-the-counter $ 83 $ 5 $ — $ 78 $ 17 $ — $ — $ 17 Foreign currency contracts: Over-the-counter 3 3 — — 2 2 — — Total derivatives, subject to a master netting or similar arrangement $ 86 $ 8 $ — $ 78 $ 19 $ 2 $ — $ 17 Volumes The following table presents the volume of Dominion Energy Gas’ derivative activity at December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Interest rate (1) $ 250,000,000 $ 1,050,000,000 Foreign currency (1) € — € 250,000,000 (1) Maturity is determined based on final settlement period. A The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected After-Tax Maximum Term (millions) Interest rate $(84 ) $ 15 300 months Foreign currency 3 (2 ) 78 months Total $(81 ) $ 13 The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., anticipated sales) in earnings, thereby achieving the realization of prices contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in market prices, interest rates, and foreign currency exchange rates. Fair Value and Gains and Losses on Derivative Instruments The following table presents the fair values of Dominion Energy Gas’ derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – under Fair Value – not under Total (millions) At December 31, 2019 ASSETS Noncurrent Assets Foreign currency $ 8 $ — $ 8 Total noncurrent derivative assets (1) 8 — 8 Total derivative assets $ 8 $ — $ 8 LIABILITIES Current Liabilities Interest rate $30 $ — $ 30 Foreign currency 3 — 3 Total current derivative liabilities (2) 33 — 33 Noncurrent Liabilities Interest rate 53 — 53 Total noncurrent derivative (3) 53 — 53 Total derivative liabilities $86 $ — $ 86 At December 31, 2018 ASSETS Current Assets Commodity $ 3 $ — $ 3 Interest rate 2 — 2 Total current derivative assets (4) 5 — 5 Noncurrent Assets Foreign currency 26 — 26 Total noncurrent derivative assets (1) 26 — 26 Total derivative assets $31 $ — $ 31 LIABILITIES Current Liabilities Interest rate $ 9 $ — $ 9 Foreign currency 2 — 2 Total current derivative liabilities (2) 11 — 11 Noncurrent Liabilities Interest rate 8 — 8 Total noncurrent derivative (3) 8 — 8 Total derivative liabilities $19 $ — $ 19 (1) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets. (2) Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets . (3) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. (4) Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets. The following tables present the gains and losses on Dominion Energy Gas’ derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives Portion) (1) Amount of Gain (Loss) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ 4 Total commodity $ 1 $ 4 Interest rate (2) (68 ) (5 ) Foreign currency (3) (18 ) (6 ) Total $ (85 ) $ (7 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ (8 ) Total commodity $ 1 $ (8 ) Interest rate (2) (16 ) (5 ) Foreign currency (3) (6 ) (13 ) Total $ (21 ) $ (26 ) Year Ended December 31, 2017 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ (8 ) Total commodity $ (10 ) $ (8 ) Interest rate (2) 1 (6 ) Foreign currency (3) 18 20 Total $ 9 $ 6 (1) Amounts deferred into AOCI have no associated effect in Dominion Energy Gas’ Consolidated Statements of Income. (2) Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges. (3) Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in other income. Derivatives not designated as hedging Amount of Gain (Loss) Recognized in Income on Derivatives Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity Operating revenue $— $(11 ) $— Total $— $(11 ) $—

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 8. Earnings Per Share The following table presents the calculation of Dominion Energy’s basic and diluted EPS: 2019 2018 2017 (millions, except EPS) Net income attributable to Dominion Energy $ 1,358 $ 2,447 $ 2,999 Preferred stock dividends (see Note 19) (17 ) — — Net income attributable to Dominion Energy – Basic 1,341 2,447 2,999 Dilutive effect of Series A Preferred Stock (28 ) — — Net income attributable to Dominion Energy – Diluted 1,313 2,447 2,999 Average shares of common stock outstanding – Basic 808.8 654.2 636.0 Net effect of dilutive securities (1) 0.1 0.7 — Average shares of common stock outstanding – Diluted 808.9 654.9 636.0 Earnings Per Common Share – Basic $ 1.66 $ 3.74 $ 4.72 Earnings Per Common Share – Diluted $ 1.62 $ 3.74 $ 4.72 (1) Dilutive securities for 2018 consist primarily of forward sale agreements, effective April 2018 to December 2018. See Notes 17 and 19 for more information. The 2019 Equity Units are potentially dilutive securities. The forward stock purchase contracts included within the 2019 Equity Units were excluded from the calculation of diluted EPS for the year ended December 31, 2019, as the dilutive stock price threshold was not met. The Series A Preferred Stock included within the 2019 Equity Units is excluded from the effect of dilutive securities within diluted EPS, but a fair value adjustment is reflected within net income attributable to Dominion Energy for the calculation of diluted EPS for the year ended December 31, 2019 based upon the expectation that the conversion will be settled in cash rather than through the issuance of Dominion Energy common stock. The 2016 Equity Units were potentially dilutive securities, but were excluded from the calculation of diluted EPS for the years ended December 31, 2019, 2018 and 2017 as the dilutive stock price threshold was not met. The Dominion Energy Midstream convertible preferred units were potentially dilutive securities but had no effect on the calculation of diluted EPS for the years ended December 31, 2018 and 2017. In calculating diluted EPS in connection with the Dominion Energy Midstream convertible preferred units, Dominion Energy applied the if-converted

Investments

Investments	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	Note 9. Investments Dominion Energy Equity and Debt Securities Rabbi Trust Securities Equity and fixed income securities and cash equivalents in Dominion Energy’s rabbi trusts and classified as trading totaled $120 million and $111 million at December 31, 2019 and 2018, respectively. Decommissioning Trust Securities Dominion Energy holds equity and fixed income securities, insurance contracts and cash equivalents in nuclear decommissioning trust funds to fund future decommissioning costs for its nuclear plants. Dominion Energy’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) December 31, 2019 Equity securities: (1) U.S. $ 1,807 $ 2,451 $ (20 ) $ 4,238 Fixed income securities: (2) Corporate debt instruments 434 29 — 463 Government securities 1,108 39 (2 ) 1,145 Common/collective trust funds 115 4 — 119 Insurance contracts 214 — — 214 Cash equivalents and other (3) 13 — — 13 Total $ 3,691 $ 2,523 $ (22 ) (4) $ 6,192 December 31, 2018 Equity securities: (1) U.S. $1,741 $1,640 $(51) $3,330 Fixed income securities: (2) Corporate debt instruments 435 5 (9) 431 Government securities 1,092 17 (12) 1,097 Common/collective trust funds 76 — — 76 Cash equivalents and other 4 — — 4 Total $3,348 $1,662 $(72) (4) $4,938 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (3) Includes pending purchases of securities of $1 million at December 31, 2019. (4) The fair value of securities in an unrealized loss position was $298 million and $833 million at December 31, 2019 and 2018, respectively. The portion of unrealized gains and losses that relates to equity securities held within Dominion Energy’s nuclear decommissioning trusts is summarized below: Year Ended December 31, 2019 2018 (millions) Net gains (losses) recognized during the period $ 919 $ (245 ) Less: Net gains recognized during the period on securities sold during the period (80 ) (58 ) Unrealized gains (losses) recognized during the period on securities still held at December 31, 2019 and 2018 (1) $ 839 $ (303 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. The fair value of Dominion Energy’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at December 31, 2019 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 198 Due after one year through five years 412 Due after five years through ten years 390 Due after ten years 727 Total $ 1,727 Presented below is selected information regarding Dominion Energy’s equity and fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds. Year Ended December 31, 2019 2018 2017 (millions) Proceeds from sales $ 1,712 $ 1,804 $ 1,831 Realized gains (1) 195 140 166 Realized losses (1) 96 91 71 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2. Dominion Energy recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows: Year Ended December 31, 2019 2018 2017 (millions) Total other-than-temporary impairment losses (1) $ 3 $ 30 $ 44 Losses recorded to the nuclear decommissioning trust regulatory liability — — (16 ) Losses recognized in other comprehensive income (before taxes) (3 ) (30 ) (5 ) Net impairment losses recognized in earnings $ — $ — $ 23 (1) Amounts include other-than-temporary impairment losses for fixed income securities of $5 million at December 31, 2017. Virginia Power Virginia Power holds equity and fixed income securities and cash equivalents in nuclear decommissioning trust funds to fund future decommissioning costs for its nuclear plants. Virginia Power’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair (millions) December 31, 2019 Equity securities: (1) U.S. $894 $1,144 $(11) $2,027 Fixed income securities: (2) Corporate debt instruments 241 15 — 256 Government securities 534 14 (2) 546 Common/collective trust funds 51 — — 51 Cash equivalents and other 1 — — 1 Total $1,721 $1,173 $(13) (4) $2,881 December 31, 2018 Equity securities: (1) U.S. $ 858 $751 $(24) $1,585 Fixed income securities: (2) Corporate debt instruments 224 2 (5) 221 Government securities 504 7 (5) 506 Common/collective trust funds 51 — — 51 Cash equivalents and other (3) 6 — — 6 Total $1,643 $760 $(34) (4) $2,369 (1) Unrealized gains and losses on equity securities, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (3) Includes pending sales of securities of $6 million at December 31, 2018. (4) The fair value of securities in an unrealized loss position was $185 million and $404 million at December 31, 2019 and 2018, respectively. The portion of unrealized gains and losses that relates to equity securities held within Virginia Power’s nuclear decommissioning trusts is summarized below: Year Ended December 31, 2019 2018 (millions) Net gains (losses) recognized during the period $ 423 $ (105 ) Less: Net gains recognized during the period on securities sold during the period (20 ) (32 ) Unrealized gains (losses) recognized during the period on securities still held at December 31, 2019 and 2018 (1) $ 403 $ (137 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. The fair value of Virginia Power’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at December 31, 2019, by contractual maturity is as follows: Amount (millions) Due in one year or less $ 91 Due after one year through five years 175 Due after five years through ten years 206 Due after ten years 381 Total $853 Presented below is selected information regarding Virginia Power’s equity and fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds. Year Ended December 31, 2019 2018 2017 (millions) Proceeds from sales $ 858 $ 887 $ 849 Realized gains (1) 58 60 75 Realized losses (1) 22 27 30 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2. Virginia Power recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows: Year Ended December 31, 2019 2018 2017 (millions) Total other-than-temporary impairment losses (1) $ 2 $ 15 $ 20 Losses recorded to the nuclear decommissioning trust regulatory liability — — (16 ) Losses recognized in other comprehensive income (before taxes) (2 ) (15 ) (2 ) Net impairment losses recognized in earnings $ — $ — $ 2 (1) Amounts include other-than-temporary impairment losses for fixed income securities of $2 million at December 31, 2017. Equity Method Investments Dominion Energy Investments that Dominion Energy account for under the equity method of accounting are as follows: Company Ownership% Investment Balance Description As of December 31, 2019 2018 (millions) Atlantic Coast Pipeline 48 % $ 1,123 $ 820 Gas transmission system Iroquois 50 % 276 302 Gas transmission system Fowler Ridge 50 % 74 82 Wind-powered merchant generation facility Wrangler 20 % 77 — Nonregulated retail energy marketing Other (1)(2) various 96 74 Total $ 1,646 $ 1,278 (1) Liability of less than $1 million associated with NedPower recorded to other deferred credits and other liabilities, on the Consolidated Balance Sheets as of December 31, 2018. See additional discussion of NedPower below. (2) Dominion Energy has an $ 80 2 Dominion Energy’s equity earnings on its investments totaled $168 million, $197 million and $14 million in 2019, 2018 and 2017, respectively, included in other income in Dominion Energy’s Consolidated Statements of Income. Dominion Energy received distributions from these investments of $112 million, $209 million and $419 million in 2019, 2018 and 2017, respectively. As of December 31, 2019 and 2018 , , , Atlantic Coast Pipeline In September 2014, Dominion Energy, along with Duke and Southern, announced the formation of Atlantic Coast Pipeline. The Atlantic Coast Pipeline partnership agreement includes provisions to allow Dominion Energy an option to purchase additional ownership interest in Atlantic Coast Pipeline to maintain a leading ownership percentage. As of December 31, 2019, the members hold the following membership interests: Dominion Energy, 48%; Duke, 47%; and Southern, 5%. Atlantic Coast Pipeline is focused on constructing an approximately 600-mile 20-year Dominion Energy recorded contributions of $186 million, $414 million and $310 million during 2019, 2018 and 2017, respectively, to Atlantic Coast Pipeline. At December 31, 2019, Dominion Energy had $7 million of contributions payable to Atlantic Coast Pipeline included within other current liabilities in the Consolidated Balance Sheets. Dominion Energy did not receive distributions from Atlantic Coast Pipeline during 2019 and received distributions of $36 million and $270 million during 2018 and 2017, respectively. In October 2017, Dominion Energy entered into a guarantee agreement to support a portion of Atlantic Coast Pipeline’s obligation under its credit facility. See Note 23 for more information. The Atlantic Coast Pipeline Project is the subject of challenges in federal courts including, among others, challenges of the Atlantic Coast Pipeline Project’s biological opinion and incidental take statement, permits providing right of way crossings of certain federal lands, the U.S. Army Corps of Engineers 404 permit, the air permit for a compressor station at Buckingham, Virginia, and the FERC order approving the CPCN. Each of these challenges alleges non-compliance right-of-way. preparation for a reissuance of the biological opinion and incidental take statement. In June 2019, the Solicitor General of the U.S. and Atlantic Coast Pipeline filed petitions requesting that the Supreme Court of the U.S. hear the case regarding the Appalachian Trail crossing. In February 2020, the Supreme Court of the U.S. heard oral arguments in the case and is expected to issue a ruling no later than June 2020. If a favorable ruling is not received, Atlantic Coast Pipeline is also evaluating possible legislative and administrative remedies to this issue. Given the legal challenges described above and ongoing discussions with customers, project construction is expected to be completed by the end of 2021, with full in-service major In February 2020, Dominion Energy entered into agreements with Southern to acquire its 5% membership interest in Atlantic Coast Pipeline and its 100% ownership interest in Pivotal LNG, Inc., for approximately $175 million in aggregate, plus certain purchase price adjustments. Pivotal LNG, Inc. includes a 50% noncontrolling interest in JAX LNG, LLC, an LNG supplier in Florida serving the growing marine and truck LNG markets. The acquisitions are expected to close by the second quarter of 2020. Following completion of the acquisition, Dominion Energy will own a 53% noncontrolling membership interest in Atlantic Coast Pipeline which will continue to be reflected as an equity method investment as the power to direct the activities most significant to Atlantic Coast Pipeline is shared with Duke. Blue Racer In December 2018, Dominion Energy sold its 50% limited partnership interest in Blue Racer for up-front after-tax), and, as a result, Dominion Energy will not recognize any additional gain unless such consideration is realizable. In the first quarter of 2019, Dominion Energy received $151 million of additional consideration, including applicable interest, in connection with this sale. Blue Racer did not achieve the 2019 financial performance milestones set forth in the sale agreement. Fowler Ridge & NedPower In the fourth quarter of 2017, Dominion Energy recorded a charge of $126 million ($76 million after-tax) As a result of the impairment recorded by NedPower, Dominion Energy evaluated its equity method investment in Fowler Ridge, a similar wind-powered merchant generation facility, determined its fair value was other than-temporarily impaired and recorded an impairment charge of $32 million ($20 million after-tax) Wrangler In September 2019, Dominion Energy entered into an agreement to form Wrangler, a partnership with Interstate Gas Supply, Inc. Wrangler will operate a nonregulated natural gas retail energy marketing business with Dominion Energy contributing its nonregulated retail energy marketing operations and Interstate Gas Supply, Inc. contributing cash. Dominion Energy has a 20% noncontrolling ownership interest in Wrangler which is accounted for as an equity method investment as Dominion Energy has the ability to exercise significant influence, but not control, over the investee. The initial contribution, consisting of SEMI, closed in December 2019 for which Dominion Energy received $301 million in cash proceeds and a 20% noncontrolling ownership interest in Wrangler with an write-off As of December 31, 2019, $41 million of assets associated with Dominion Energy’s residential contracts to be contributed to Wrangler in December 2020 were classified as held for sale and were included in other current assets on the Consolidated Balance Sheet. The related disposal group is primarily comprised of customer receivables and inventories. All activity relating to Wrangler is recorded within Gas Transmission & Storage. Other – Catalyst Old River Hydroelectric Limited Partnership In September 2018, Dominion Energy completed the sale of its 25% limited partnership interest in Catalyst Old River Hydroelectric Limited Partnership and received proceeds of $91 million. The sale resulted in a gain of $87 million ($63 million after-tax), Dominion Energy Gas Investments that Dominion Energy Gas account for under the equity method of accounting are as follows: Company Ownership% Investment Description As of December 31, 2019 2018 (millions) Iroquois 50 % $276 $302 Gas transmission system White River Hub 50 % 36 37 Gas transmission system Total $312 $339 Dominion Energy Gas’ equity earnings on its investment totaled $43 million, $54 million and $47 million in 2019, 2018 and 2017, respectively. Dominion Energy Gas received distributions from its investment of $74 million, $64 million and $55 million in 2019, 2018 and 2017, respectively. As of December 31, 2019 and 2018, the carrying amount of Dominion Energy Gas’ investment exceeded its share of underlying equity in net assets by $146 million. The difference reflects equity method goodwill and is not being amortized. Summarized financial information provided to Dominion Energy Gas by Iroquois for 100% of Iroquois at December 31, 2019 and 2018 , , At December 31, 2019 At December 31, 2018 (millions) Current assets $ 79 $ 112 Noncurrent assets 586 588 Current liabilities 37 165 Noncurrent liabilities 334 193 Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 (millions) Revenues $180 $194 $194 Operating income 93 108 110 Net income 82 94 93 Summarized financial information provided to Dominion Energy Gas by White River Hub for 100% of White River Hub at December 31, 2019 and 2018 and for the years ended December 31, 2019, 2018 and 2017 is presented below. At December 31, 2019 At December 31, 2018 (millions) Current assets $ 3 $ 3 Noncurrent assets 39 41 Current liabilities 2 2 Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 (millions) Revenues $10 $12 $10 Operating income 6 8 7 Net income 6 8 7 Atlantic Coast Pipeline DETI provides services to Atlantic Coast Pipeline which totaled $103 million, $203 million and $129 million in 2019, 2018 and 2017, respectively, included in operating revenue in Dominion Energy and Dominion Energy Gas’ Consolidated Statements of Income. Amounts receivable related to these services were $7 million and $13 million at December 31, 2019 and 2018, respectively, composed entirely of accrued unbilled revenue, included in other receivables in Dominion Energy Gas’ Consolidated Balance Sheets.

Property Plant And Equipment

Property Plant And Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property Plant And Equipment	Note 10. Property, Plant and Major classes of property, plant and equipment and their respective balances for the Companies are as follows: At December 31, 2019 2018 (millions) Dominion Energy Utility: Generation $ 25,317 $ 18,896 Transmission 20,486 16,666 Distribution 25,748 18,535 Storage 3,227 2,906 Nuclear fuel 2,296 1,626 Oil and gas 1,792 1,763 General and other 2,413 1,783 Plant under construction 2,956 2,348 Total utility 84,235 64,523 Non-jurisdictional—including plant under construction 854 407 Nonutility: Merchant generation-nuclear 1,652 1,550 Merchant generation-other 3,985 3,802 Nuclear fuel 930 1,025 Gas gathering and processing 190 185 LNG facility 4,425 3,977 Other—including plant under construction 1,195 1,109 Total nonutility 12,377 11,648 Total property, plant and equipment $ 97,466 $ 76,578 Virginia Power Utility: Generation $ 19,552 $ 18,896 Transmission 10,229 9,391 Distribution 12,095 11,771 Nuclear fuel 1,688 1,626 General and other 825 820 Plant under construction 1,784 1,602 Total utility 46,173 44,106 Non-jurisdictional—including plant under construction 854 407 Other 11 11 Total property, plant and equipment $ 47,038 $ 44,524 Dominion Energy Gas Utility: Transmission $ 7,014 $ 6,790 Storage 2,799 2,615 General and other 219 210 Plant under construction 574 732 Total utility 10,606 10,347 Nonutility: LNG facility 4,425 3,977 Other—including plant under construction 135 376 Total nonutility 4,560 4,353 Total property, plant and equipment $ 15,166 $ 14,700 Jointly-Owned Power Stations Dominion Energy and Virginia Power’s proportionate share of jointly-owned power stations at December 31, 2019 is as follows Bath (1) North (1) Clover (1) Millstone (2) Summer (2) (millions, except Ownership interest 60 % 88.4 % 50 % 93.5 % 66.7 % Plant in service 1,058 2,564 610 1,267 1,394 Accumulated depreciation (661 ) (1,321 ) (247 ) (449 ) (659 ) Nuclear fuel — 793 — 483 608 Accumulated amortization of nuclear fuel — (634 ) — (390 ) (389 ) Plant under construction 7 143 5 87 77 (1) Units jointly owned by Virginia Power. (2) Unit jointly owned by Dominion Energy. The co-owners Sale of Certain Retail Energy Marketing Assets In October 2017, Dominion Energy entered into an agreement to sell certain assets associated with its nonregulated retail energy marketing operations for total consideration of $143 million, subject to customary approvals and certain adjustments. In December 2017, the first phase of the agreement closed for $79 million, which resulted in the recognition of a $78 million ($48 million after-tax) after-tax) ten-year Sale of Certain Merchant Generation Facilities In December 2018, Dominion Energy completed the sale of Fairless and Manchester for total consideration of $1.2 billion, subject to customary closing adjustments. Dominion Energy recognized a gain of $210 million ($198 million after-tax) after-tax more-likely-than-not Acquisition of Solar Projects The following table presents acquisitions by Virginia Power of solar projects. Virginia Power has claimed or expects to claim federal investment tax credits on the projects. Date Agreement Entered Date Agreement Closed Project Location Project Name Project Cost (millions) (1) Date of Commercial Operations MW Capacity September 2017 October 2018 North Carolina Pecan $140 December 2018 75 September 2017 June 2019 North Carolina Gutenberg 142 September 2019 80 June 2018 February 2019 Virginia Gloucester 37 April 2019 20 August 2018 May 2019 Virginia Grasshopper 130 Expected 2020 80 August 2018 May 2019 North Carolina Chestnut 130 Expected 2020 75 June 2019 June 2019 Virginia Ft. Powhatan 270 Expected 2021 150 June 2019 August 2019 Virginia Belcher 160 Expected 2020 88 August 2019 November 2019 Virginia Bedford 110 Expected 2021 70 October 2019 October 2019 Virginia Maplewood 190 Expected 2022 120 December 2019 January 2020 Virginia Rochambeau 35 Expected 2021 20 (1) Includes acquisition costs. The following table presents acquisitions by Dominion Energy of solar projects. Dominion Energy expects to claim federal investment tax credits on the projects. Date Agreement Entered Date Agreement Closed Project Location Project Project Cost (millions) (1) Date of Commercial Operations MW Capacity August 2019 August 2019 Virginia Greensville $130 Expected 2020 80 August 2019 August 2019 Virginia Myrtle 35 Expected 2020 15 September 2019 September 2019 South Carolina Seabrook 103 December 2019 72 November 2019 November 2019 North Carolina Wilkinson 153 December 2019 74 (1) Includes acquisition costs. Assignment of Tower Rental Portfolio Virginia Power rents space on certain of its electric transmission towers to various wireless carriers for communications antennas and other equipment. In March 2017, Virginia Power sold its rental portfolio to Vertical Bridge Towers II, LLC for $91 million in cash. The proceeds are subject to Virginia Power’s FERC-regulated tariff, under which it is required to return half of the proceeds to customers. Virginia Power recorded $7 million and $6 million in operating revenue in 2019 and 2018, respectively, and $11 million in other income in Assignments of Shale Development Rights In December 2013, Dominion Energy Gas closed on agreements with two natural gas producers to convey over time approximately 100,000 acres of Marcellus Shale development rights underneath several of its natural gas storage fields. The agreements provided for payments to Dominion Energy Gas, subject to customary adjustments, of approximately $200 million over a period of nine years, and an overriding royalty interest in gas produced from the acreage. In 2013 through 2016, Dominion Energy Gas received approximately $116 million of cash proceeds and through amendments closed on the immediate conveyance of approximately 9,000 acres and a 32% partial interest in the 70,000 acres of Marcellus Shale development rights, which resulted in the recognition of $78 million of gains. In August 2017, Dominion Energy Gas and the natural gas producer signed an amendment to the agreement, which included the finalization of contractual matters on previous conveyances, the conveyance of Dominion Energy Gas’ remaining 68% interest in approximately 70,000 acres and the elimination of Dominion Energy Gas’ overriding royalty interest in gas produced from all acreage. Dominion Energy Gas received total consideration of $130 million, with $65 million received in 2017 and $65 million received in September 2018 in connection with the final conveyance. As a result of this amendment, in 2017, Dominion Energy Gas recognized a $56 million ($33 million after-tax) after-tax) after-tax) approximately $70 million in proceeds on the conveyance of approximately 12,000 acres and as well as a 50% interest in approximately 4,000 acres along with an overriding royalty interest, which resulted in the recognition of $70 million of gains. In July 2017, in connection with the existing agreement, Dominion Energy Gas conveyed an additional 50% interest in approximately 2,000 acres of Marcellus Shale development rights and received proceeds of $5 million and an overriding royalty interest in gas produced from the acreage. This transaction resulted in a $5 million ($3 million after-tax) after-tax) In March 2018, Dominion Energy Gas closed an agreement with a natural gas producer to convey approximately 11,000 acres of Utica and Point Pleasant Shale development rights underneath one of its natural gas storage fields. The agreement provided for a payment to Dominion Energy Gas, subject to customary adjustments, of $16 million. In March 2018, Dominion Energy Gas received cash proceeds of $16 million associated with the conveyance of the acreage, resulting in a $16 million ($12 million after-tax) In June 2018, Dominion Energy Gas closed an amendment to an agreement with a natural gas producer for the elimination of Dominion Energy Gas’ overriding royalty interest in gas produced from approximately 9,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields previously conveyed in December 2013. In June 2018, Dominion Energy Gas received proceeds of $6 million associated with the transaction, resulting in a $6 million ($4 million after-tax) All activity related to shale development rights is recorded within Gas Transmission & Storage.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 11. Goodwill and Intangible Assets Goodwill During the fourth quarter of 2019, Dominion Energy realigned its segments which resulted in the formation of five primary operating segments and Dominion Energy Gas finalized a restructuring that was accounted for as a reorganization of entities under common control. The historical information presented herein has been recast to the current segment presentation and the current structure of Dominion Energy Gas. With respect to the segment realignment, goodwill has been reassigned to the affected reporting units and operating segments using a relative fair value allocation approach. The changes in Dominion Energy’s and Dominion Energy Gas’ carrying amount and segment allocation of goodwill are presented below: Dominion Gas Gas Dominion Contracted Corporate Total (millions) Dominion Energy Balance at December 31, 2017 (1) $ 2,106 $ 1,561 $ 2,496 $ — $ 242 $— $ 6,405 Purchase Accounting Adjustment — 4 1 — — — 5 Balance at December 31, 2018 (1) $ 2,106 $ 1,565 $ 2,497 $ — $ 242 $— $ 6,410 SCANA Combination (2) — 73 1,015 1,521 — — 2,609 Contribution of SEMI to Wrangler (3) — (73 ) — — — — (73 ) Balance at December 31, 2019 (1) $ 2,106 $ 1,565 $ 3,512 $ 1,521 $ 242 $— $ 8,946 Dominion Energy Gas Balance at December 31, 2017 (1) $ — $ 1,466 $ — $ — $ — $— $ 1,466 Purchase Accounting Adjustment — 5 — — — — 5 Balance at December 31, 2018 (1) $ — $ 1,471 $ — $ — $ — $— $ 1,471 No events affecting goodwill — — — — — — — Balance at December 31, 2019 (1) $ — $ 1,471 $ — $ — $ — $— $ 1,471 (1) Goodwill amounts do not contain any accumulated impairment losses. (2) See Note 3 for discussion of Dominion Energy’s acquisitions. (3) See Note 9 for additional information. Other Intangible Assets The Companies’ other intangible assets are subject to amortization over their estimated useful lives. Dominion Energy’s amortization expense for intangible assets was $106 million, $82 million and $80 million for 2019, 2018 and 2017, respectively. In 2019 , in addition to intangible assets acquired in the SCANA Combination , right-of-use right-of-use The components of intangible assets are as follows: 2019 2018 At December 31, Gross Accumulated Gross Accumulated (millions) Dominion Energy Software, licenses and other $ 1,340 $549 $ 1,033 $363 Virginia Power Software, licenses and other $ 406 $135 $ 384 $134 Dominion Energy Gas Software, licenses and other $ 178 $ 72 $ 179 $ 64 Annual amortization expense for these intangible assets is estimated to be as follows: 2020 2021 2022 2023 2024 (millions) Dominion Energy $ 88 $ 78 $ 70 $ 56 $ 49 Virginia Power $ 25 $ 19 $ 15 $ 8 $ 6 Dominion Energy Gas $ 9 $ 8 $ 8 $ 5 $ 4

Regulatory Assets and Liabiliti

Regulatory Assets and Liabilities	12 Months Ended
	Dec. 31, 2019
Regulated Operations [Abstract]
Regulatory Assets and Liabilities	Note 12. Regulatory Assets And Liabilities Regulatory assets and liabilities include the following: At December 31, 2019 2018 (millions) Dominion Energy Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred project costs and DSM programs for gas utilities (2) 21 17 Unrecovered gas costs (3) 102 14 Deferred rate adjustment clause costs for Virginia electric utility (4)(5) 109 78 Deferred nuclear refueling outage costs (6) 68 69 NND Project costs (7) 138 — PJM transmission rates (8) 121 45 Other 272 99 Regulatory assets-current 879 496 Deferred cost of fuel used in electric generation (1) — 83 P (9) 1,431 1,497 Deferred rate adjustment clause costs for Virginia electric utility (4)(5)(10) 235 230 PJM transmission rates (8) 85 192 Deferred project costs for gas utilities (2) 521 335 Interest rate hedges (11) 741 184 AROs and related funding (12) 311 — Cost of reacquired debt (13)(14) 262 3 NND Project costs (7) 2,503 — Ash pond and landfill closure costs (15) 1,016 27 Other 582 125 Regulatory assets-noncurrent 7,687 2,676 Total regulatory assets $ 8,566 $ 3,172 Regulatory liabilities: Provision for future cost of removal and AROs (16) $ 142 $ 117 Reserve for refunds and rate credits to electric utility customers (17) 143 71 Cost-of-service (18) 4 104 Income taxes refundable through future rates (19) 77 — Monetization of guarantee settlement (20) 67 — Other 64 64 Regulatory liabilities-current 497 356 Income taxes refundable through future rates (19) 5,088 4,071 Provision for future cost of removal and AROs (16) 2,302 1,409 Nuclear decommissioning trust (21) 1,471 1,070 Monetization of guarantee settlement (20) 970 — Reserve for refunds and rate credits to electric utility customers (17) 656 — Overrecovered other postretirement benefit costs (22) 189 120 Other 325 170 Regulatory liabilities-noncurrent 11,001 6,840 Total regulatory liabilities $ 11,498 $ 7,196 (1) Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations. (2) Primarily reflects amounts expected to be collected from or owed to gas customers in Dominion Energy’s service territories associated with current and prospective rider projects, including CEP, PIR and pipeline integrity management. See Note 13 for more information. (3) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (4) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (5) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (6) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (7) Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year (8) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (9) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries. (10) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (11) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 27 years as of December 31, 2019. (12) Represents deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 (13) Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be (14) During 2019, DESC purchased certain of its first mortgage bonds as discussed in Note 18. As a result of these transactions, DESC incurred net costs, including write-offs of unamortized discount, premium and debt issuance costs, of $270 million. (15) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCRs to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (16) Rates charged to customers by Dominion Energy’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (17) Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year one-time (18) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at the Companies’ regulated electric generation and electric and natural gas distribution operations. See Notes 3 and 13 for additional information. (19) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (20) Reflects amounts to be refunded to DESC electric service customers over a 20-year (21) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs. (22) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. At December 31, 2019 2018 (millions) Virginia Power Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred rate adjustment clause costs (2)(3) 109 78 Deferred nuclear refueling outage costs (4) 68 69 PJM transmission rates (5) 121 45 Other 87 58 Regulatory assets-current 433 424 Deferred rate adjustment clause costs (2)(3)(6) 235 230 PJM transmission rates (5) 85 192 Interest rate hedges (7) 404 151 Deferred cost of fuel used in electric generation (1) — 83 Ash pond and landfill closure costs (8) 1,016 27 Other 123 54 Regulatory assets-noncurrent 1,863 737 Total regulatory assets $ 2,296 $ 1,161 Regulatory liabilities: Provision for future cost of removal (9) $ 103 $ 92 Cost-of-service (10) — 95 Reserve for rate credits to electric utility customers (11`) — 71 Income taxes refundable through future rates (12) 54 — Other 10 41 Regulatory liabilities-current 167 299 Income taxes refundable through future rates (12) 2,438 2,579 Nuclear decommissioning trust (13) 1,471 1,070 Provision for future cost of removal (9) 1,054 940 Other 111 58 Regulatory liabilities-noncurrent 5,074 4,647 Total regulatory liabilities $ 5,241 $ 4,946 (1) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations. (2) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (3) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (4) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (5) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (6) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (7) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 24 years as of December 31, 2019. (8) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (9) Rates charged to customers by Virginia Power’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (10) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at regulated electric generation and distribution operations. See Note 13 for additional information. (11) Charge associated with Virginia legislation enacted in March 2018 that required one-time (12) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (13) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs. At December 31, 2019 2018 (millions) Dominion Energy Gas Regulatory assets: Unrecovered gas costs (1) $ 2 $ 1 Other 6 7 Regulatory assets-current (2) 8 8 Unrecognized pension and other postretirement benefit costs (3) — 15 Interest rate hedges (4) 32 33 Other 8 4 Regulatory assets-noncurrent 40 52 Total regulatory assets $ 48 $ 60 Regulatory liabilities: Provision for future cost of removal and AROs (5) $ 18 $ 9 Overrecovered gas costs (1) 8 7 Other 15 8 Regulatory liabilities-current (6) 41 24 Income taxes refundable through future rates (7) 560 530 Provision for future cost of removal and AROs (6) 95 113 Overrecovered other postretirement benefit costs (8) 133 106 Other 12 16 Regulatory liabilities-noncurrent 800 765 Total regulatory liabilities $ 841 $ 789 (1) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (2) Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets. (3) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy Gas’ rate-regulated subsidiaries. (4) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted average useful life of approximately 30 years. (5) Rates charged to customers by Dominion Energy Gas’ regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (6) Current regulatory liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. (7) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (8) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. At December 31, 2019, Dominion Energy, Virginia Power and Dominion Energy Gas’ regulatory assets include $3.3 billion, $1.8 billion and $46 million, respectively, on which they do not expect to earn a return during the applicable recovery period. With the exception of certain items discussed above, the majority of these expenditures are expected to be recovered within the next two years.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2019
Regulated Operations [Abstract]
Regulatory Matters	N ote Regulatory Matters Involving Potential Loss Contingencies As a result of issues generated in the ordinary course of business, the Companies are involved in various regulatory matters. Certain regulatory matters may ultimately result in a loss; however, as such matters are in an initial procedural phase, involve uncertainty as to the outcome of pending reviews or orders, and/or involve significant factual issues that need to be resolved, it is not possible for the Companies to estimate a range of possible loss. For regulatory matters that the Companies cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the regulatory process such that the Companies are able to estimate a range of possible loss. For regulatory matters that the Companies are able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any estimated range is based on currently available information, involves elements of judgment and significant uncertainties and may not represent the Companies’ maximum possible loss exposure. The circumstances of such regulatory matters will change from time to time and actual results may vary significantly from the current estimate. For current matters not specifically reported below, management does not anticipate that the outcome from such matters would have a material effect on the Companies’ financial position, liquidity or results of operations. FERC Electric Under the Federal Power Act, FERC regulates wholesale sales and transmission of electricity in interstate commerce by public utilities. Virginia Power purchases and, under its market based rate authority, sells electricity in the PJM wholesale market and to wholesale purchasers in Virginia and North Carolina. DESC sells electricity to wholesale purchasers in its balancing authority area under its electric cost based tariff and to wholesale purchasers outside of its balancing authority area under its market based rate authority. Dominion Energy’s merchant generators sell electricity in the PJM, CAISO and ISO-NE Rates In April 2008, FERC granted an application for Virginia Power’s electric transmission operations to establish a forward-looking formula rate mechanism that updates transmission rates on an annual basis and approved an ROE effective as of January 1, 2008. The formula rate is designed to recover the expected revenue requirement for each calendar year and is updated based on actual costs. The FERC-approved formula method, which is based on projected costs, allows Virginia Power to earn a current return on its investment in electric transmission infrastructure. In March 2010, ODEC and North Carolina Electric Membership Corporation filed a complaint with FERC against Virginia Power claiming, among other issues, that the incremental costs of undergrounding certain transmission line projects were unjust, unreasonable and unduly discriminatory or preferential and should be excluded from Virginia Power’s transmission formula rate. A settlement of the other issues raised in the complaint was approved by FERC in May 2012. In March 2014, FERC issued an order excluding from Virginia Power’s transmission rates for wholesale transmission customers located outside Virginia the incremental costs of undergrounding certain transmission line projects. FERC found it is not just and reasonable for non-Virginia In October 2017, FERC issued an order determining the calculation of the incremental costs of undergrounding the transmission projects and affirming that the costs are to be recovered from the wholesale transmission customers with loads located in Virginia. FERC directed Virginia Power to rebill all wholesale transmission customers retroactively to March 2010 within 30 days of when the proceeding becomes final and no longer subject to rehearing. In November 2017, Virginia Power, North Carolina Electric Membership Corporation and the wholesale transmission customers filed petitions for rehearing. In July 2018, FERC denied the rehearing requests related to the October 2017 order determining the calculation of the undergrounding costs. Several parties have appealed FERC’s decision to the U.S. Court of Appeals for the D.C. Circuit. In December 2019, the U.S. Court of Appeals for the D.C. Circuit denied the appeal. In January 2019, FERC issued an order denying PJM’s request to waive certain provisions of the PJM Tariff regarding the liquidation of a portfolio of FTRs owned by GreenHat who had defaulted on its financial obligations. As a result of FERC’s order, PJM is required to use the existing tariff provisions to liquidate GreenHat’s FTR portfolio and allocate the resulting costs to PJM members. In February 2019, PJM filed a request for clarification and rehearing with FERC. Also in February 2019, Virginia Power and certain other PJM members filed a request for rehearing with FERC. In June 2019, FERC established a hearing and settlement proceedings to address the issues raised in PJM’s request for clarification and rehearing. In October 2019, PJM submitted a settlement offer to FERC which was approved by FERC in December 2019. Based on the terms of the settlement, the impact to Virginia Power is expected to be immaterial. FERC—G as In July 2017, FERC audit staff communicated to DETI that it had substantially completed an audit of DETI’s compliance with the accounting and reporting requirements of FERC’s Uniform System of Accounts and provided a description of matters and preliminary recommendations. In November 2017, the FERC audit staff issued its audit report which could have the potential to result in adjustments which could be material to Dominion Energy and Dominion Energy Gas’ results of operations. In December 2017, DETI provided its response to the audit report. DETI requested FERC review of contested findings and submitted its plan for compliance with the uncontested portions of the report. In connection with one uncontested issue, DETI recognized a charge of $15 million ($9 million after-tax) (reflected in the Corporate and Other segment) write-off after-tax) (reflected in the Corporate and Other segment) 2017 Tax Reform Act Subsequent to the enactment of the 2017 Tax Reform Act, the Companies’ state regulators issued orders requesting that public utilities evaluate the total tax impact on the entity’s cost of service and accrue a regulatory liability attributable to the benefits of the reduction in the corporate income tax rate. Certain of the orders requested that the public utilities submit a response to the state regulatory commissions detailing the total tax impact on the utility’s cost of service. The Companies began to reserve the impacts of the cost-of-service In September 2018, the Virginia Commission issued an order directing Virginia Power to submit a filing quantifying the impacts of the 2017 Tax Reform Act in advance of the April 1, 2019 implementation as required by legislation, which filing was submitted in October 2018. In January 2019, Virginia Power filed updated testimony with a proposed annual revenue reduction of approximately $171 million. Additionally, Virginia Power proposed to issue a one-time true-up one-time In August 2018, Virginia Power filed with FERC to waive protocols and begin reflecting projected tax reform benefits of approximately $100 million through the transmission formula rate prior to the normal formula rate process. FERC granted the waiver and the amounts began being reflected in customer billings in November 2018 reflecting the adjustment effective January 1, 2018. In October 2018, the North Carolina Commission issued an order requesting companies file to reduce base rates expeditiously. Virginia Power made its compliance filing in October 2018 and submitted an annual base rate revenue decrease of approximately $14 million effective in early 2019. Virginia Power also proposed to issue a one-time one-time In March 2019, Questar Gas filed with the Utah and Wyoming Commissions as to the impact of excess deferred income taxes resulting from the 2017 Tax Reform Act. Questar Gas proposed to return the 2018 amortization of excess deferred income taxes to customers and to incorporate the remaining excess deferred income tax impact in its next general rate cases in each jurisdiction. In May 2019, the Utah Commission issued an order approving Questar Gas’ proposal to pass back the 2018 amortization of excess deferred income taxes over twelve months beginning in June 2019. The matter with the Wyoming Commission is pending. In October 2018, the Ohio Commission issued an order requiring rate-regulated utilities to file an application reflecting the impact of the 2017 Tax Reform Act on current rates by January 1, 2019. In December 2018, East Ohio filed its application proposing an approach to establishing rates and charges by and through which to return tax reform benefits to its customers. In December 2019, the Ohio Commission issued an order approving customer credits of approximately $600 million that will be shared with customers primarily over the remaining book life of the property to which the excess deferred income taxes relate. In addition, East Ohio will reduce rates approximately $19 million per year to account for the 2017 Tax Reform Act’s impact on its equity return component of rates charged to customers. In connection with the SCANA Merger Approval Order, the South Carolina Commission approved DESC’s provision of approximately $100 million in bill credits related to the 2017 Tax Reform Act’s impact on retail electric customer rates for the period beginning January 2018 through January 2019. These credits have been included in bills rendered on and after the first billing cycle of February 2019. In addition, the South Carolina Commission approved a tax rider whereby the effects of the reduction in the corporate income tax rate resulting from the 2017 Tax Reform Act will benefit retail electric customers. This tax rider reduced base rates to retail electric customers by approximately $63 million in 2019 and is expected to reduce these rates by $67 million in 2020. In October 2018, the South Carolina Commission issued an order approving adjustment to DESC’s natural gas rate schedules, under the terms of the Natural Gas Rate Stabilization Act, to reflect the reduction in the federal corporate tax rate arising from the 2017 Tax Reform Act. The approved natural gas rate schedules also included a tax reform rate rider to refund certain income tax amounts previously collected from customers. These lower rates, representing a $20 million decreased revenue requirement, became effective for bills rendered on and after the first billing cycle in November 2018. In December 2018, the North Carolina Commission issued an order approving PSNC’s proposed adjustments to customer rates, representing a $13 million decreased revenue requirement, to reflect the reduction in the federal corporate tax rate arising from the 2017 Tax Reform Act. These lower rates became effective for service rendered on and after January 1, 2019. Amounts collected in customer rates during 2018 and amounts arising from excess deferred income taxes have been recorded in regulatory liabilities and must be considered in PSNC’s next general rate case proceeding or in three years, whichever is sooner. The reduction in the federal corporate tax rate and its impact on PSNC’s various rate riders will be addressed in future proceedings related to those riders. During 2018, Dominion Energy’s FERC-regulated pipelines, including those accounted for as equity method investments, filed the Form 501-G 501-G Other Regulatory Matters V irginia egulation The Regulation Act enacted in 2007 instituted a cost-of-service The Regulation Act authorizes stand-alone rate adjustment clauses for recovery of costs for new generation projects, FERC-approved transmission costs, underground distribution lines, environmental compliance, conservation and energy efficiency programs, renewable energy programs and nuclear license renewals, and also contains statutory provisions directing Virginia Power to file annual fuel cost recovery cases with the Virginia Commission. As amended, it provides for enhanced returns on capital expenditures on specific newly-proposed generation projects. If the Virginia Commission’s future rate decisions, including actions relating to Virginia Power’s rate adjustment clause filings, differ materially from Virginia Power’s expectations, it may adversely affect its results of operations, financial condition and cash flows. Grid Transformation and Security Act of 2018 In March 2018, the GTSA reinstated base rate reviews on a triennial basis, other than the first review which will be a quadrennial review, occurring for Virginia Power in 2021 for the four successive 12-month In the triennial review proceedings, earnings that are more than 70 basis points above the utility’s authorized ROE that might have been refunded to customers and served as the basis for a reduction in future rates, may be reduced by Virginia Commission - The legislation also includes provisions requiring Virginia Power to provide current customers one-time after-tax) non-jurisdictional 2018 and January 2019, Virginia Power credited $138 million and $77 million, respectively, to current customers’ bills. In addition, Virginia Power reduced base rates on an annual basis by $125 million effective July 2018, to reflect the estimated effect of the 2017 Tax Reform Act. In March 2019, the Virginia Commission directed an annual revenue reduction of $183 million in rates for generation and distribution services pursuant to the GTSA effective April 2019. In July 2018, Virginia Power filed a petition with the Virginia Commission for approval of the first three years of its ten-year In September 2019, Virginia Power filed a revised plan which includes six components: (i) smart meters; (ii) customer information platform; (iii) grid improvement projects; (iv) telecommunications infrastructure; (v) cyber security; and (vi) a smart charging electric vehicle infrastructure pilot program (Phase IB). For Phase IB, the total proposed capital investment during 2019 – 2021 is $503 million and the proposed operations and maintenance investment is $78 million. This matter is pending. Regulation Act In March 2019, Virginia Power filed an application for the Virginia Commission to determine the general ROE for Virginia Power’s non-transmission 12-month Virginia Fuel Expenses In May 2019, Virginia Power filed its annual fuel factor with the Virginia Commission to recover an estimated $1.5 billion in Virginia jurisdictional projected fuel expenses for the rate year beginning July 1, 2019 and the projected June 30, 2019 under recovered balance of $124 million. Virginia Power’s proposed fuel rate represented a fuel revenue decrease of $192 million when applied to projected kilowatt-hour sales for the period July 1, 2019 to June 30, 2020. Subsequently in May 2019, Virginia Power revised its fuel factor filing to reduce the projected June 30, 2019 underrecovered balance to $107 million and a fuel revenue decrease of $254 million. In August 2019, the Virginia Commission approved Virginia Power’s fuel rate. In February 2020, Virginia Power filed its annual fuel factor with the Virginia Commission to recover an estimated $1.2 billion in Virginia jurisdictional projected fuel expenses for the rate year beginning July 1, 2020 and a projected over-recovery of approximately $81 million for the prior year balance as of June 30, 2020. Virginia Power requested that the new fuel factor rate be implemented on an interim basis two months early, beginning on May 1, 2020. Virginia Power’s proposed fuel rate represents a fuel revenue decrease of approximately $393 million when applied to projected kilowatt-hour sales for the rate year beginning May 1, 2020. This matter is pending. Battery Storage Pilot In August 2019, Virginia Power filed an application with the Virginia Commission to participate in a pilot program for electric power storage batteries, which includes three projects for deployment of battery energy storage systems. Virginia Power also requested an amended CPCN to construct and operate a battery energy storage system at Scott Solar. The projects are estimated to cost approximately $35 million. In February 2020, the Virginia Commission approved the request. Solar Facility Projects • In July 2018, Virginia Power filed an application with the Virginia Commission for CPCNs to construct two solar facilities. Colonial Trail West and Spring Grove 1 are estimated to cost approximately $410 million, excluding financing costs. Colonial Trail West commenced commercial operations in December 2019 and Spring Grove 1 is expected to commence commercial operations in the fourth quarter of 2020. Virginia Power also applied for approval of Rider US-3 20-year US-3. • In July 2019, Virginia Power filed an application with the Virginia Commission for a CPCN to construct Sadler Solar, which is estimated to cost approximately $146 million, excluding financing costs. Sadler Solar is expected to commence commercial operations, subject to regulatory approvals associated with the project, in the fourth quarter of 2020. Virginia Power also applied for approval of Rider US-4 20- US-4 Rate Adjustment Clauses Below is a discussion of significant riders associated with various Virginia Power projects: • The Virginia Commission previously approved Rider T1 concerning transmission rates. In May 2019, Virginia Power proposed a $920 million total revenue requirement consisting of $474 million for the transmission component of Virginia Power’s base rates and $446 million for Rider T1 for the rate year beginning September 1, 2019. This total revenue requirement represents a $271 million increase versus the revenues to be produced during the rate year under current rates. In July 2019, the Virginia Commission approved the filing. • The Virginia Commission previously approved Rider U in conjunction with cost recovery to move certain electric distribution facilities underground as authorized by Virginia legislation. In October 2019, the Virginia Commission approved Virginia Power’s proposed fourth phase of conversions totaling $123 million and a total $52 million revenue requirement for the rate year beginning February 1, 2020 for continuing recovery of the previously approved phase conversions and the proposed fourth phase conversions. • The Virginia Commission previously approved Riders C1A, C2A and C3A in connection with cost recovery for DSM programs. In December 2019, Virginia Power filed a petition to approve an additional 10 new energy efficiency programs and one new demand response DSM program for five years, subject to future extension, with a $186 million cost cap, and proposed a total $60 million revenue requirement for the rate year beginning September 1, 2020. This total revenue requirement represents an $11 million increase over the previous year. • In December 2018, Virginia Power filed a petition requesting approval of Rider E and proposed a $114 million total revenue requirement for the rate year beginning November 1, 2019. In August 2019, the Virginia Commission issued an order approving in part and denying in part the petition. As a result, Virginia Power recorded a $21 million ($16 million after-tax) write-off true-up, • Additional significant riders associated with various Virginia Power projects are as follows: Rider Name Application Approval Date Rate Year Beginning Total Increase Rider S May 2019 February 2020 April 2020 $195 $(20 ) Rider GV May 2019 February 2020 April 2020 132 12 Rider W May 2019 February 2020 April 2020 106 1 Rider R May 2019 February 2020 April 2020 44 (13 ) Rider B May 2019 February 2020 April 2020 32 (6 ) Rider US-3 July 2019 Pending June 2020 31 21 Rider BW October 2019 Pending September 2020 120 1 Rider US-2 October 2019 Pending September 2020 10 (5 ) Rider E January 2020 Pending November 2020 88 (16 ) Coastal Virginia Offshore Wind Project In November 2018, Virginia Power received approval from the Virginia Commission for its petition seeking a prudency determination as provided in the GTSA with respect to the proposed Coastal Virginia Offshore Wind Pilot project consisting of two 6 MW wind turbine generators located approximately 27 miles off the coast of Virginia Beach, Virginia in federal waters, and for a CPCN, for the generation tie line connecting the generators to shore. This project is expected to cost approximately $300 million and to be placed into service by the end of 2020. Electric Transmission Projects In November 2013, the Virginia Commission issued an order granting Virginia Power a CPCN to construct approximately 7 miles of new overhead 500 kV transmission line from the existing Surry switching station in Surry County to a new Skiffes Creek switching station in James City County, and approximately 20 miles of new 230 kV transmission line in James City County, York County, and the City of Newport News from the proposed new Skiffes Creek switching station to Virginia Power’s existing Whealton substation in the City of Hampton. In February 2019, the transmission line project was placed into service. In March 2019, the U.S. Court of Appeals for the D.C. Circuit issued an order vacating the permit from the U.S. Army Corps of Engineers issued in July 2017 and ordered the U.S. Army Corps of Engineers to do a full environmental impact study of the project. In April 2019, Virginia Power and the U.S. Army Corps of Engineers filed petitions for rehearing with the U.S. Court of Appeals for the D.C. Circuit, asking that the permit from the U.S. Army Corps of Engineers remain in effect while an environmental impact study is performed. In May 2019, the U.S. Court of Appeals for the D.C. Circuit denied the request for rehearing and ordered the U.S. District Court for the D.C. Circuit to consider and issue a ruling on whether the permit should be vacated during the U.S. Army Corps of Engineers’ preparation of an environmental impact statement. In November 2019, the U.S. District Court for the D.C. Circuit issued an order allowing the permit to remain in effect while an environmental impact study is performed. This matter is pending. Additional significant Virginia Power electric transmission projects approved or Description and Location of Project Application Date Approval Date Type of Line Miles Lines Cost (millions) Rebuild and operate transmission line between Lanexa and the Northern Neck June 2018 February 2019 230 kV 3 $ 30 Build a new substation and connect three existing October 2018 June 2019 230 kV <1 30 Rebuild and operate the Glebe March 2019 September 2019 230 kV <1 125 Rebuild and operate transmission line between Valley, Virginia and April 2019 November 2019 500 kV 65 290 Rebuild and operate transmission line between the Suffolk substation and May 2019 November 2019 230 kV 11 20 Rebuild and operate five segments between the Loudoun August 2019 Pending 230 kV 19 70 Build new Evergreen Mills switching station and line loops in Loudoun County, December 2019 Pending 230 kV 2 30 Build new Lockridge substation and line loop in Loudoun County, Virginia December 2019 Pending 230 kV <1 35 North Carolina Regulation North Carolina Base Rate Case In March 2019, Virginia Power filed its base rate case and schedules with the North Carolina Commission. Virginia Power proposed a non-fuel, non-fuel In February 2020, the North Carolina Commission issued its final order relating to base rates. Virginia Power is reviewing the order and assessing its options. North Carolina Fuel Filing In August 2019, Virginia Power submitted its annual filing to the North Carolina Commission to adjust the fuel component of its electric rates. Virginia Power proposed a total $18 million decrease to the fuel component of its electric rates for the rate year beginning February 1, 2020. In January 2020, the North Carolina Commission approved Virginia Power’s proposed fuel change adjustment. South Carolina Regulation DSM Programs DESC has approval for a DSM rider through which it recovers expenditures related to its DSM programs. In January 2019, DESC filed an application with the South Carolina Commission seeking approval to recover $30 million of costs and net lost revenues associated with these programs, along with an incentive to invest in such programs. In April 2019, the South Carolina Commission approved the request for the rate year beginning with the first billing cycle of May 2019. In January 2020, DESC filed an application with the South Carolina Commission seeking approval to recover $40 million of costs and net lost revenues associated with these programs, along with an incentive to invest in such programs. This matter is pending. Natural Gas Rate Stabilization Act In June 2019, DESC filed with the South Carolina Commission its monitoring report for the 12-month Cost of Fuel DESC’s retail electric rates include a cost of fuel component approved by the South Carolina Commission which may be adjusted periodically to reflect changes in the price of fuel purchased by DESC. In April 2019, the South Carolina Commission approved DESC’s proposal to decrease the total fuel cost component of retail electric rates. DESC’s proposal included maintaining its base fuel component at the current level to produce a projected under-recovered balance of $35 million at the end of the 12-month In February 2020, DESC filed a proposal with the South Carolina Commission to decrease the total fuel cost component of retail electric rates. DESC’s proposed decrease would reduce annual base fuel component recoveries by approximately $44 million and is projected to return to customers the existing over-collected balance while recovering DESC’s current base fuel costs over the 12-month period beginning with the first billing cycle of May 2020. In addition, DESC proposed an increase to its variable environmental and distributed energy resource components. This matter is pending. Electric Transmission Projects In 2020, DESC expects to begin several electric transmission projects in connection with two new nuclear plants under development by Southern. These transmission projects are required to be in place prior to these plants beginning operations to maintain reliability. DESC anticipates the projects to go into service in phases, costing approximately $75 million in aggregate. In February 2020, DESC filed an application with the South Carolina Commission requesting approval to construct and operate 28 miles of 230 kV transmission lines in Aiken County, South Carolina estimated to cost approximately $30 million. This matter is pending. Ohio Regulation PIR Program In 2008, East Ohio began PIR, aimed at replacing approximately 25% of its pipeline system. In September 2016, the Ohio Commission approved a stipulation filed jointly by East Ohio and the Staff of the Ohio Commission to continue the PIR program and associated cost recovery for another five-year term, calendar years 2017 through 2021, and to permit East Ohio to increase its annual capital expenditures to $200 million by 2018 and 3% per year thereafter subject to the cost recovery rate increase caps proposed by East Ohio. In April 2019, the Ohio Commission approved East Ohio’s application to adjust the PIR cost recovery rates for 2018 costs. The filing reflects gross plant investment for 2018 of $202 million, cumulative gross plant investment of $1.6 billion and a revenue requirement of $190 million. CEP Program In 2011, East Ohio began CEP which enables East Ohio to defer depreciation expense, property tax expense and carrying costs at the debt rate of 6.5% on capital investments not covered by its PIR program to expand, upgrade or replace its pipeline system and information technology systems as well as investments necessary to comply with the Ohio Commission or other government regulation. In May 2019, East Ohio filed an application for an alternative rate plan to establish a CEP rider to recover existing CEP-related West Virginia Regulation PREP In May 2019, Hope filed a PREP application with the West Virginia Commission requesting approval to recover PREP costs related to $29 million and $39 million of projected capital investment for 2019 and 2020, respectively. The application also includes a true-up Utah And Wyoming Regulation LNG Storage Facility In April 2019, Questar Gas filed a request with the Utah Commission for pre-approval pre-approval Utah Base Rate Case In July 2019, Questar Gas filed its base rate case and schedules with the Utah Commission. Questar Gas proposed a non-fuel, In February 2020, the Utah Commission approved a non-fuel, base rate increase of $3 million effective March 2020. This revenue requirement increase is based on an approved ROE of 9.50%. Wyoming Base Rate Case In November 2019, Questar Gas filed its base rate case and schedules with the Wyoming Commission. Questar Gas proposed a non-fuel, base rate increase of $4 million effective September 2020. The base rate increase was proposed to replace aging infrastructure and expand its system. Questar Gas presented an earned return of 7.46%, based upon a fully-adjusted test period, compared to its authorized 9.5% return, and proposed a 10.5% ROE. This matter is pending. Rural Expansion Program In December 2019, Questar Gas filed an application with the Utah Commission for a CPCN to construct natural gas infrastructure to extend service to Eureka, Utah. The project is expected to include 11 miles of high-pressure pipeline and up to 360 service lines and to be in service in late 2021. Questar Gas also requested approval of a rural expansion rate adjustment tracker to recover the construction costs of the project. This matter is pending. FERC—GAS Cove Point In February 2019, Cove Point submitted its annual electric power cost adjustment to FERC requesting approval to recover $24 million. FERC approved the adjustment in March 2019. In June 2015, Cove Point executed two binding precedent agreements for the approximately $150 million Eastern Market Access Project. In January 2018, Cove Point received FERC authorization to construct and operate the project facilities. In October 2018, Cove Point announced it was evaluating alternatives to a proposed Charles County, Maryland compressor station that was initially part of this project and in December 2018, after working with project customers for alternative solutions, decided not to pursue further construction at this location resulting in a revised project estimate of approximately $45 million and a write-off after-tax). In connection with the Eastern Market Access Project, in August 2019, Cove Point filed to update its annual electric power cost adjustment requesting FERC approval to recover $25 million, representing an increase of $1 million from the adjustment approved in March 2019. FERC approved the adjustment in August 2019. In January 2020, pursuant to the terms of a previous settlement, Cove Point filed a general rate case for its FERC-jurisdictional services, with proposed rates to be effective March 1, 2020. Cove Point proposed an annual cost-of-service DETI In , DETI submitted its annual transportation cost rate adjustment to FERC requesting approval to recover $ million. Also in , DETI submitted its annual electric power cost adjustment to FERC requesting approval to recover $ million. In , FERC approved these adjustments. In December 2019, DETI filed an application to request FERC authorization to construct, operate and maintain the Tri-West project to provide 120,000 Dth per day of firm transportation service in from Pennsylvania to Ohio for delivery to Tennessee Gas Pipeline Company. The project facilities are expected to cost approximately $25 million and be in service by the end of 2020. In August 2018, DETI executed a binding precedent agreement with a customer for the West Loop project. The project is expected to cost approximately $95 million and provide 150,000 Dth per day of firm transportation service from Pennsylvania to Ohio for delivery to a proposed combined-cycle, natural gas-fired In January 2018, DETI filed an application to request FERC authorization to construct and operate certain facilities located in Ohio and Pennsylvania for the Sweden Valley project. In June 2019, DETI withdrew its application for the project due to certain regulatory delays. As a result of the project abandonment, during the second quarter of 2019, DETI recorded a charge of $13 million ($10 million

Asset Retirement Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Note 14. Asset Retirement Obligations AROs represent obligations that result from laws, statutes, contracts and regulations related to the eventual retirement of certain of the Companies’ long-lived assets. Dominion Energy and Virginia Power’s AROs are primarily associated with the decommissioning of their nuclear generation facilities and ash pond and landfill closures. Dominion Energy Gas’ AROs primarily include plugging and abandonment of gas and oil wells and the interim retirement of natural gas gathering, transmission, distribution and storage pipeline components. The Companies have also identified, but not recognized, AROs related to the retirement of the Cove Point LNG Facility, Dominion Energy and Dominion Energy Gas’ storage wells in their underground natural gas storage network, certain Virginia Power electric transmission and distribution assets located on property with easements, rights of way, franchises and lease agreements, Virginia Power’s hydroelectric generation facilities and the abatement of certain asbestos not expected to be disturbed in Dominion Energy and Virginia Power’s generation facilities. The Companies currently do not have sufficient information to estimate a reasonable range of expected retirement dates for any of these assets since the economic lives of these assets can be extended indefinitely through regular repair and maintenance and they currently have no plans to retire or dispose of any of these assets. As a result, a settlement date is not determinable for these assets and AROs for these assets will not be reflected in the Consolidated Financial Statements until sufficient information becomes available to determine a reasonable estimate of the fair value of the activities to be performed. The Companies continue to monitor operational and strategic developments to identify if sufficient information exists to reasonably estimate a retirement date for these assets. The changes to AROs during 2018 and 2019 were as follows: Amount (millions) Dominion Energy AROs at December 31, 2017 $ 2,432 Obligations incurred during the period 20 Obligations settled during the period (159 ) Revisions in estimated cash flows (2) 120 Accretion 119 AROs at December 31, 2018 (1) $ 2,532 Obligations incurred during the period (2) 2,413 Obligations settled during the period (137 ) AROs acquired in the SCANA Combination 577 Revisions in estimated cash flows (3) (324 ) Accretion 213 AROs at December 31, 2019 (1) $ 5,274 Virginia Power AROs at December 31, 2017 $ 1,365 Obligations incurred during the period 14 Obligations settled during the period (119 ) Revisions in estimated cash flows (2) 120 Accretion 65 AROs at December 31, 2018 $ 1,445 Obligations incurred during the period ( 2 ) 2,408 Obligations settled during the period (81 ) Revisions in estimated cash flows (3) (323 ) Accretion 132 AROs at December 31, 2019 $ 3,581 Dominion Energy Gas AROs at December 31, 2017 $ 85 Obligations incurred during the period 3 Obligations settled during the period (6 ) Accretion 6 AROs at December 31, 2018 ( 4 ) $ 88 Obligations settled during the period (3 ) Accretion 4 AROs at December 31, 2019 ( 4 ) $ 89 (1) Includes $282 million and $408 million reported in other current liabilities at December 31, 2018, and 2019, respectively. (2) Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information. (3) Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities as well as revisions for 20 year license extensions for regulated nuclear power stations in Virginia. (4) Includes $74 million and $75 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and 2019, respectively. Dominion Energy’s AROs at December 31, 2019 and 2018, include $1.7 billion and $1.6 billion, respectively, with $0.8 billion and $0.9 billion recorded by Virginia Power, related to the future decommissioning of their nuclear facilities. Dominion Energy and Virginia Power have established trusts dedicated to funding the future decommissioning activities. At December 31, 2019 and 2018, the aggregate fair value of Dominion Energy’s trusts, consisting primarily of equity and debt securities, totaled $6.2 billion and $4.9 billion, respectively. At December 31, 2019 and 2018, the aggregate fair value of Virginia Power’s trusts, consisting primarily of debt and equity securities, totaled $2.9 billion and $2.4 billion, respectively. In addition, AROs at December 31, 2019 include $2.6 billion related to Virginia Power’s future ash pond and landfill closure costs. Regulatory mechanisms, primar ily

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	Note 15. Leases At December 31, 2019, the Companies had the following lease assets and liabilities recorded in the Consolidated Balance Sheets: December 31, 2019 (millions) Dominion Energy Lease assets: Operating lease assets (1) $ 499 Finance lease assets (2) 140 Total lease assets $ 639 Lease liabilities: Operating lease liabilities (3) $ 59 Finance lease liabilities (4) 29 Total lease liabilities—current 88 Operating lease liabilities (5) 442 Finance lease liabilities 105 Total lease liabilities—noncurrent 547 Total lease liabilities $ 635 Virginia Power Operating lease assets (1) $ 212 Finance lease assets (2) 19 Total lease assets $ 231 Lease liabilities: Operating lease liabilities (3) $ 30 Finance lease liabilities (4) 3 Total lease liabilities—current 33 Operating lease liabilities (5) 180 Finance lease liabilities 16 Total lease liabilities—noncurrent 196 Total lease liabilities $ 229 Dominion Energy Gas Operating lease assets (1) $ 37 Finance lease assets (2) 6 Total lease assets $ 43 Lease liabilities: Operating lease liabilities (3) $ 6 Finance lease liabilities (4) 1 Total lease liabilities—current 7 Operating lease liabilities (5) 29 Finance lease liabilities 5 Total lease liabilities—noncurrent 34 Total lease liabilities $ 41 (1) Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets. (2) Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $27 million, $4 million and $1 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at December 31, 2019. (3) Included in other current liabilities in the Companies’ Consolidated Balance Sheets. (4) Included in securities due within one year in the Companies’ Consolidated Balance Sheets. (5) Included in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets. In addition to the amounts disclosed above, Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 includes property plant and equipment and accumulated depreciation of $2.8 billion and $364 million, respectively, related to facilities subject to power purchase agreements under which Dominion Energy is the lessor. For the year ended December 31, 2019, total lease cost associated with the Companies’ leasing arrangements consisted of the following: Year Ended December 31, 2019 (millions) Dominion Energy Finance lease cost: Amortization $ 20 Interest 4 Operating lease cost 87 Short-term lease cost 30 Variable lease cost 6 Total lease cost $ 147 Virginia Power Operating lease cost $ 41 Short-term lease cost 13 Variable lease cost 2 Total lease cost $ 56 Dominion Energy Gas Operating lease cost $ 7 Short-term lease cost 7 Total lease cost $ 14 For the year ended December 31, 2019, cash paid for amounts included in the measurement of the lease liabilities consisted of the following amounts, included in the Companies’ Consolidated Statements of Cash Flows: Year Ended December 31, (millions) Dominion Energy Operating cash flows for finance leases $ 4 Operating cash flows for operating leases 121 Financing cash flows for finance leases 20 Virginia Power Operating cash flows for operating leases 56 Dominion Energy Gas Operating cash flows for operating leases 14 In addition to the amounts disclosed above, Dominion Energy’s Consolidated Statement of Income for the year ended December 31, 2019 includes $174 million of rental revenue included in operating revenue and $94 million of depreciation expense, included in depreciation, depletion and amortization, related to facilities subject to power purchase agreements under which Dominion Energy is the lessor. At December 31, 2019, the weighted average remaining lease term and weighted discount rate for the Companies’ finance and operating leases were as follows: December 31, 2019 Dominion Energy Weighted average remaining lease term—finance leases 5 years Weighted average remaining lease term—operating leases 21 years Weighted average discount rate—finance leases 3.84 % Weighted average discount rate—operating leases 4.47 % Virginia Power Weighted average remaining lease term—finance leases 6 years Weighted average remaining lease term—operating leases 20 years Weighted average discount rate—finance leases 4.12 % Weighted average discount rate—operating leases 4.29 % Dominion Energy Gas Weighted average remaining lease term—finance leases 6 years Weighted average remaining lease term—operating leases 11 years Weighted average discount rate—finance leases 4.08 % Weighted average discount rate—operating leases 4.37 % The Companies’ lease liabilities have the following maturities: Maturity of Lease Liabilities Dominion Energy Virginia Power Dominion Energy Operating Finance Operating Finance Operating Finance (millions) 2020 $ 72 $ 34 $ 34 $ 4 $ 7 $ 2 2021 65 31 30 4 6 1 2022 55 29 24 4 5 1 2023 45 26 19 3 4 1 2024 36 19 14 3 3 1 After 2024 582 9 205 4 20 1 Total undiscounted lease payments 855 148 326 22 45 7 Present value adjustment (377 ) (14 ) (139 ) (3 ) (10 ) (1 ) Present value of lease liabilities $ 478 $ 134 $ 187 $ 19 $ 35 $ 6 Corporate Office Leasing Arrangements In July 2016, Dominion Energy signed an agreement with a lessor to construct and lease a new corporate office property in Richmond, Virginia. The lessor provided equity and obtained financing commitments from debt investors, totaling $365 million, which funded total project costs. The project became substantially complete in August 2019 at which point the facility was available for Dominion Energy’s use and the five-year lease term commenced. Upon commencement, the lease for the facility was classified as a finance lease. At the end of the initial lease term, Dominion Energy can (i) extend the term of the lease for an additional five years, subject to the approval of the participants, at current market terms, (ii) purchase the property for an amount equal to the project costs or, (iii) subject to certain terms and conditions, sell the property on behalf of the lessor to a third party using commercially reasonable efforts to obtain the highest cash purchase price for the property. If the project is sold and the proceeds from the sale are insufficient to repay the investors for the project costs, Dominion Energy may be required to make a payment to the lessor, up to 87% of project costs, for the difference between the project costs and sale proceeds. No end-of-term right-of-use In December 2019, Dominion Energy signed an agreement with a lessor to construct and lease a new corporate office property in Richmond, Virginia. The lessor is providing equity and has obtained financing commitments from debt investors, totaling $465 million, to fund the estimated project costs. If Dominion Energy ultimately proceeds with the through completion, it not earlier than mid-2023. The 51-month Dominion Energy is not considered the owner during construction for financial accounting purposes and, therefore, will not reflect the construction activity in its consolidated financial statements. Dominion Energy expects to recognize a right-of-use

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 16. Variable Interest Entities The primary beneficiary of a VIE is required to consolidate the VIE and to disclose certain information about its significant variable interests in the VIE. The primary beneficiary of a VIE is the entity that has both 1) the power to direct the activities that most significantly impact the entity’s economic performance and 2) the obligation to absorb losses or receive benefits from the entity that could potentially be significant to the VIE. Dominion Energy At December 31, 2019, Dominion Energy owns the manager and 67% of the membership interest in certain merchant solar facilities, as discussed in Note 2. Dominion Energy has concluded that these entities are VIEs due to the members lacking the characteristics of a controlling financial interest. In addition, in 2016 Dominion Energy created a wholly owned subsidiary, SBL Holdco, as a holding company of its interest in the VIE merchant solar facilities and accordingly SBL Holdco is a VIE. Dominion Energy is the primary beneficiary of SBL Holdco and the merchant solar facilities, as it has the power to direct the activities that most significantly impact their economic performance as well as the obligation to absorb losses and benefits which could be significant to them. Dominion Energy’s securities due within one year and long-term debt include $31 million and $267 million, respectively, of debt issued by SBL Holdco net of issuance costs that is nonrecourse to Dominion Energy and is secured by SBL Holdco’s interest in certain merchant solar facilities. Dominion Energy owns a 48% membership interest in Atlantic Coast Pipeline. See Note 9 for more details regarding the nature of this entity. Dominion Energy concluded that Atlantic Coast Pipeline is a VIE because it has insufficient equity to finance its activities without additional subordinated financial support. Dominion Energy has concluded that it is not the primary beneficiary of Atlantic Coast Pipeline as it does not have the power to direct the activities of Atlantic Coast Pipeline that most significantly impact its economic performance, as the power to direct is shared among multiple unrelated parties. In February 2020, Dominion Energy entered an agreement to acquire Southern’s 5% membership interest which is expected to close by the second quarter of 2020. Following completion of the acquisition, Dominion Energy will own a 53% noncontrolling membership interest in Atlantic Coast Pipeline which is not expected to change Dominion Energy’s conclusion that it is not the primary beneficiary as the power to direct the activities most significant to Atlantic Coast Pipeline will be shared with Duke. Dominion Energy is obligated to provide capital contributions based on its ownership percentage. Dominion Energy’s maximum exposure to loss is limited to its current and future investment as well as any obligations under a guarantee provided. See Note 23 for more information. Dominion Energy previously concluded that Dominion Energy Midstream was a VIE due to the limited partners lacking the characteristics of a controlling financial interest and that it was the primary beneficiary as it had the power to direct the activities that most significantly impact the economic performance as well as to absorb losses and benefits which could be significant to Dominion Energy Midstream. In January 2019, Dominion Energy acquired all outstanding partnership interests not owned by Dominion Energy and Dominion Energy Midstream became a wholly-owned subsidiary of Dominion Energy. As a result, Dominion Energy concluded that Dominion Energy Midstream is no longer a VIE. Dominion Energy and Virginia Power Dominion Energy and Virginia Power’s nuclear decommissioning trust funds and Dominion Energy’s rabbi trusts hold investments in limited partnerships or similar type entities (see Note 9 for further details). Dominion Energy and Virginia Power concluded that these partnership investments are VIEs due to the limited partners lacking the characteristics of a controlling financial interest. Dominion Energy and Virginia Power have concluded neither is the primary beneficiary as they do not have the power to direct the activities that most significantly impact these VIEs’ economic performance. Dominion Energy and Virginia Power are obligated to provide capital contributions to the partnerships as required by each partnership agreement based on their ownership percentages. Dominion Energy and Virginia Power’s maximum exposure to loss is limited to their current and future investments. Virginia Power Virginia Power had a long-term power and capacity contract with one non-utility non-utility after-tax) non-utility non-utility Dominion Energy and Dominion Energy Gas As part of the Dominion Energy Gas Restructuring, Dominion Energy contributed to Dominion Energy Gas a 75% controlling limited partner interest in Cove Point. In December 2019, Dominion Energy sold its retained 25% noncontrolling limited partner interest in Cove Point. Dominion Energy Gas concluded that Cove Point is a VIE due to the limited partners lacking the characteristics of a controlling financial interest. Dominion Energy Gas is the primary beneficiary of Cove Point as it has the power to direct the activities that most significantly impact its economic performance as well as the obligation to absorb losses and benefits which could be significant to it. Dominion Energy Gas DETI has been engaged to oversee the construction of, and to subsequently operate and maintain, the projects undertaken by Atlantic Coast Pipeline based on the overall direction and oversight of Atlantic Coast Pipeline’s members. An affiliate of DETI holds a membership interest in Atlantic Coast Pipeline, therefore DETI is considered to have a variable interest in Atlantic Coast Pipeline. The members of Atlantic Coast Pipeline hold the power to direct the construction, operations and maintenance activities of the entity. DETI has concluded it is not the primary beneficiary of Atlantic Coast Pipeline as it does not have the power to direct the activities of Atlantic Coast Pipeline that most significantly impact its economic performance. DETI has no obligation to absorb any losses of the VIE. See Note 25 for information about associated related party receivable balances. Dominion Energy Gas purchased shared services from DECGS and DEQPS, affiliated VIEs, of $49 million, $45 million and $45 million for the years ended December 31, 2019, 2018 and 2017, respectively. Dominion Energy Gas’ Consolidated Balance Sheets included amounts due to DECGS and DEQPS of $15 million and $6 million at December 31, 2019 and at December 31, 2018, respectively. Gas determined that neither it nor any of its consolidated entities is the primary beneficiary of DECGS or DEQPS, as neither it nor any of its consolidated entities has both the power to direct the activities that most significantly impact their economic performance as well as the obligation to absorb losses and benefits which could be significant to them. DECGS and DEQPS provide marketing and operation al Virginia Power and Dominion Energy Gas Virginia Power and Dominion Energy Gas purchased shared services from DES, an affiliated VIE, of $387 million and $119 million, $335 million and $106 million, and $340 million and $106 million for the years ended December 31, 2019, 2018 and 2017, respectively. Virginia Power and Dominion Energy Gas’ Consolidated Balance Sheets included amounts due to DES of $102 million and $27 million, respectively, at December 31, 2019, and $107 million and $43 million, respectively, at December 31, 2018, recorded in payables to affiliates in the Consolidated Balance Sheets. Virginia Power and Dominion Energy Gas determined that neither is the primary beneficiary of DES as neither has both the power to direct the activities that most significantly impact its economic performance as well as the obligation to absorb losses and benefits which could be significant to it. DES provides accounting, legal, finance and certain administrative and technical services to all Dominion Energy subsidiaries, including Virginia Power and Dominion Energy Gas. Virginia Power and Dominion Energy Gas have no obligation to absorb more than their allocated shares of DES costs.

Short Term Debt And Credit Agre

Short Term Debt And Credit Agreements	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Short-Term Debt And Credit Agreements	Note 17. Short-term Debt and Credit Agreements The Companies use short-term debt to fund working capital requirements and as a bridge to long-term debt financings. The levels of borrowing may vary significantly during the course of the year, depending upon the timing and amount of cash requirements not satisfied by cash from operations. In addition, Dominion Energy utilizes cash and letters of credit to fund collateral requirements. Collateral requirements are impacted by commodity prices, hedging levels, Dominion Energy’s credit ratings and the credit quality of its counterparties. Dominion Energy Dominion Energy’s short-term financing is supported through its access to the joint revolving credit facility described below. Commercial paper and letters of credit outstanding, as well as capacity available under the credit facility were as follows: Facility Outstanding (1) Outstanding Facility (millions) At December 31, 2019 Joint revolving credit facility (2) $ 6,000 $836 $89 $ 5,075 At December 31, 2018 Joint revolving credit facility (2) $ 6,000 $324 $88 $ 5,588 (1) The weighted-average interest rates of the outstanding commercial paper supported by Dominion Energy’s credit facility was 2.10% and 2.93% at December 31, 2019 and 2018, respectively. (2) This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit. In March 2019, DESC’s $700 million credit facility was terminated and DESC was added as a borrower to the joint revolving credit facility discussed above with Dominion Energy, Virginia Power, Dominion Energy Gas and Questar Gas. DESC’s short-term financing is supported through its access as co-borrower sub-limit Questar Gas’ short-term financing is supported through its access as co-borrower sub-limit South Carolina Fuel Company, Inc.’s credit facility was terminated in February 2019. SCANA and PSNC’s credit facilities were terminated in March 2019. Liquidity needs for these entities may be satisfied through short-term intercompany borrowings from Dominion Energy. In April 2019, DESC renewed its FERC authority through April 2020 to issue short-term indebtedness (pursuant to Section 204 of the Federal Power Act) in amounts not to exceed $2.2 billion outstanding with maturity dates of one year or less. In addition, in April 2019, GENCO renewed its FERC authority through April 2020 to issue short-term indebtedness not to exceed $200 million outstanding with maturity dates of one year or less. In January 2020, DESC and GENCO applied to FERC for a two-year short-term borrowing authorization. The applications are pending. In addition to the credit facilities mentioned above, SBL Holdco has $30 million of credit facilities which had an original stated maturity date of December 2017 with automatic one-year one-year In February 2019, Dominion Energy Midstream terminated its $500 million revolving credit facility subsequent to repaying the outstanding balance of $73 million, plus accrued interest. In addition to the joint revolving credit facility mentioned above, Dominion Energy also has a credit facility with a maturity date in June 2020 which allows Dominion Energy to issue up to approximately $21 million in letters of credit. At December 31, 2019, Dominion Energy had $21 million in letters of credit outstanding under this agreement. In September 2019, Dominion Energy Questar borrowed $3.0 billion under a 364-Day Term Loan Agreement that accrued interest at a variable rate. The proceeds from the borrowing were used to repay the principal of Cove Point’s $3.0 billion term loan due in 2021. Dominion Energy provided a guarantee to support Dominion Energy Questar’s obligation under the 364-Day Virginia Power Virginia Power’s short-term financing is supported through its access as co-borrower Virginia Power’s share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Dominion Energy Gas, Questar Gas and DESC were as follows: Facility Outstanding (1) Outstanding (millions) At December 31, 2019 Joint revolving credit facility (2) $6,000 $243 $ 7 At December 31, 2018 Joint revolving credit facility (2) $6,000 $314 $16 (1) The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 2.10% and 2.94% at December 31, 2019 and 2018, respectively. (2) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers sub-limit sub-limit sub-limit, sub-limit sub-limit, Dominion Energy Gas Dominion Energy Gas’ short-term financing is supported by its access as co-borrower Dominion Energy Gas’ share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Virginia Power, Questar Gas and DESC were as follows: Facility Outstanding (1) Outstanding (millions) At December 31, 2019 Joint revolving credit facility (2) $1,500 $62 $— At December 31, 2018 Joint revolving credit facility (2) $1,500 $10 $— (1) The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 1.98% and 2.58% at December 31, 2019 and 2018, respectively. (2) A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers sub-limit sub-limit sub-limit, sub-limit sub-limit,

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Note 18. Long-term Debt At December 31, 2019 Weighted- average Coupon (1) 2019 2018 (millions, except percentages) Dominion Energy Gas Holdings, LLC: Unsecured senior notes: Variable rate, due 2021 2.49 % $ 500 $ 500 2.5% to 4.8%, due 2019 to 2049 (2) 3.44 % 4,631 3,587 Cove Point, term loan, due 2021 (3) — 3,000 Dominion Energy Midstream: Term loan, variable rate, due 2019 — 300 Revolving credit agreement, variable rate, due 2021 (4) — 73 Dominion Energy Questar Pipeline, unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 4.23 % 430 430 Dominion Energy Gas Holdings, LLC total principal $ 5,561 $ 7,890 Securities due within one year 2.80 % (699 ) (748 ) Credit facility borrowings (4) — (73 ) Unamortized discount and debt issuance costs (41 ) (47 ) Finance leases 5 — Dominion Energy Gas Holdings, LLC total long-term debt $ 4,826 $ 7,022 Virginia Electric and Power Company: Unsecured senior notes: 2.75% to 8.875%, due 2019 to 2049 4.27 % $ 11,789 $ 11,090 Tax- (5) (6) 2.02 % 625 664 Virginia Electric and Power Company total principal $ 12,414 $ 11,754 Securities due within one year 4.29 % (1 ) (350 ) Unamortized discount, premium and debt issuances costs, net (88 ) (83 ) Finance leases 16 — Virginia Electric and Power Company total long-term debt $ 12,341 $ 11,321 Dominion Energy, Inc.: Unsecured senior notes: Variable rates, due 2019 and 2020 2.31 % $ 300 $ 800 1.6% to 7.0%, due 2019 to 2049 (7) 4.15 % 7,688 7,488 Unsecured junior subordinated notes: 2.579% to 4.104%, due 2019 to 2024 3.01 % 2,950 2,100 Payable to affiliated trust, 8.4%, due 2031 8.40 % 10 10 Enhanced junior subordinated notes: Variable rates, due 2066 (8) 4.41 % 397 422 5.25% and 5.75%, due 2054 and 2076 5.48 % 1,485 1,485 Remarketable subordinated notes, 2.0%, due 2021 and 2024 — 1,400 Questar Gas, unsecured senior notes, 2.98% to 7.20%, due 2024 to 2051 4.25 % 750 750 SCANA: Unsecured medium term notes, 4.125% to 6.25%, due 2020 to 2022 (9)(10) 5.06 % 508 — Unsecured senior notes, variable rate, due 2034 (11) 2.61 % 66 — PSNC, senior debentures and notes, 4.13% to 7.45%, due 2020 to 2047 5.05 % 700 — DESC: First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 (12) 5.42 % 3,267 — Tax- (13) Variable rate due 2038 1.65 % 35 — GENCO, variable rates due 2038 (14) 1.65 % 33 — 3.625% and 4.00%, due 2028 and 2033 3.90 % 54 — Other 3.69 % 1 — Secured senior notes, 4.82%, due 2042 (15) 4.82 % 345 362 Term loans, variable rates, due 2023 and 2024 (15) 4.24 % 527 582 Tax- 1.70 % 27 27 Dominion Energy Gas Holdings, LLC total principal (from above) 5,561 7,890 Virginia Electric and Power Company total principal (from above) 12,414 11,754 Dominion Energy, Inc. total principal $ 37,118 $ 35,070 Fair value hedge valuation (16) 4 (20 ) Securities due within one year (8)(10)(11)(17) 3.41 % (3,133 ) (3,624 ) Credit facility borrowings (4) — (73 ) Unamortized discount, premium and debt issuance costs, net (270 ) (248 ) Finance leases 105 39 Dominion Energy, Inc. total long-term debt $ 33,824 $ 31,144 (1) Represents weighted-average coupon rates for debt outstanding as of December 31, 2019. (2) Amount includes foreign currency remeasurement adjustments. (3) In September 2019, Cove Point repaid its $3.0 billion term loan due in 2021. (4) In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018. (5) These financings relate to certain pollution control equipment at Virginia Power’s generating facilities. (6) In May 2019, Virginia Power redeemed its $40 million 5.0% Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 at the principal outstanding plus accrued interest. (7) Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary. (8) In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (9) In March 2019, SCANA purchased certain of its medium term notes having an aggregate purchase price of $300 million pursuant to tender offer that expired in the first quarter of 2019. (10) In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (11) In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (12) In February, March and September 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.8 billion pursuant to tender offers. The February and March tender offers expired in the first quarter of 2019 and the September tender offer expired in the third quarter of 2019. (13) Industrial revenue bonds totaling $68 million are secured by letters of credit that (1 4 In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released. (1 5 Represents debt associated with Eagle Solar, SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s, SBL Holdco’s and Dominion Solar Projects III, Inc’s interest in certain solar facilities. (1 6 Represents the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt. (1 7 Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc. Based on stated maturity dates rather than early redemption dates that could be elected by instrument holders, the scheduled principal payments of long-term debt at December 31, 2019, were as follows: 2020 2021 2022 2023 2024 Thereafter Total (millions, except percentages) Dominion Energy Gas $ 700 $ 500 $ — $ 650 $ 1,050 $ 2,661 $ 5,561 Weighted-average coupon 2.80 % 2.49 % — 3.29 % 2.97 % 3.95 % Virginia Power Unsecured senior notes $ — $ — $ 750 $ 700 $ 350 $ 9,989 $ 11,789 Tax- — — — — 625 625 Total $ — $ — $ 750 $ 700 $ 350 $ 10,614 $ 12,414 Weighted-average coupon — — 3.15 % 2.75 % 3.45 % 4.35 % Dominion Energy Term loans (1 ) $ 35 $ 35 $ 34 $ 259 $ 164 $ — $ 527 First mortgage bonds — 33 — — — 3,234 3,267 Unsecured senior notes (2)(3) 1,275 1,237 1,659 2,355 1,745 19,092 27,363 Secured senior notes 15 17 19 16 17 261 345 Tax- — — — — — 774 774 Unsecured junior subordinated notes payable to affiliated trusts — — — — — 10 10 Unsecured junior subordinated notes 1,000 1,250 — — 700 — 2,950 Enhanced junior subordinated notes (4) — — — — — 1,882 1,882 Total $ 2,325 $ 2,572 $ 1,712 $ 2,630 $ 2,626 $ 25,253 $ 37,118 Weighted-average coupon 3.09 % 3.15% 3.10 % 2.95% 3.19% 4.62 % (1) Excludes mandatory prepayments associated with SBL Holdco and Dominion Solar Projects III, Inc. based on cash flows in excess of debt service. At December 31, 2019, $20 million of estimated mandatory prepayments due within one year were included in securities due within one year in Dominion Energy’s Consolidated Balance Sheets. (2) In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. (3) In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. (4) In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within current liabilities in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. The Companies’ short-term credit facility and long-term debt agreements contain customary covenants and default provisions. As of December 31, 2019, there were no events of default under these covenants. Senior Note Redemptions In November 2018 and December 2018, Dominion Energy redeemed the following outstanding series of senior notes: 2011 Series A 4.45% Senior Notes due 2021, 2014 Series B 2.50% Senior Notes due 2019, 2014 Series C 3.625% Senior Notes due 2024 and 2018 Series A Floating Rate Senior Notes due 2020 with an aggregate outstanding principal of $2.2 billion. The aggregate redemption price paid was $2.2 billion and represents the principal amount outstanding, accrued and unpaid interest and the applicable make-whole premium of $34 million. Total charges of $69 million, including the make-whole premium, were recognized and recorded in interest expense in Dominion Energy’s Consolidated Statements of Income. Enhanced Junior Subordinated Notes In June 2006 and September 2006, Dominion Energy issued $300 million of June 2006 hybrids and $500 million of September 2006 hybrids, respectively. The June 2006 hybrids and the September 2006 hybrids bore interest at the three-month LIBOR plus 2.825%, reset quarterly and at the three-month LIBOR plus 2.3%, reset quarterly, respectively. Dominion Energy executed RCCs in connection with its issuance of the June 2006 hybrids and the September 2006 hybrids. Under the terms of the RCCs, redemptions of the hybrids were subject to certain conditions. In 2019, Dominion Energy purchased and cancelled $12 million and $13 million of its June 2006 hybrids and September 2006 hybrids, respectively. In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. All purchases were conducted in compliance with the applicable RCC, each of which was terminated in February 2020. In October 2014, Dominion Energy issued $685 million of October 2014 hybrids that will bear interest at 5.75% per year until October 1, 2024. Thereafter, they will bear interest at the three-month LIBOR plus 3.057%, reset quarterly. In July 2016, Dominion Energy issued $800 million of 5.25% July 2016 hybrids. The July 2016 hybrids are listed on the NYSE under the symbol DRUA. Dominion Energy may defer interest payments on the hybrids on one or more occasions for up to 10 consecutive years. If the interest payments on the hybrids are deferred, Dominion Energy may not make distributions related to its capital stock, including dividends, redemptions, repurchases, liquidation payments or guarantee payments during the deferral period. Also, during the deferral period, Dominion Energy may not make any payments on or redeem or repurchase any debt securities that are equal in right of payment with, or subordinated to, the hybrids. Remarketable Subordinated Notes In July 2014, Dominion Energy issued $1.0 billion of 2014 Series A 6.375% Equity Units, initially in the form of Corporate Units. In August 2016, Dominion Energy issued $1.4 billion of 2016 Series A 6.75% Equity Units, initially in the form of Corporate Units. The Corporate Units were listed on the NYSE under the symbols DCUC and DCUD, respectively. Each 2014 Series A Corporate Unit consisted of a stock purchase contract and 1/20 interest in a RSN issued by Dominion Energy. Each 2016 Series A Corporate Unit consisted of a stock purchase contract, a 1/40 interest in a 2016 Series A-1 A-2 In May 2017, Dominion Energy successfully remarketed the $1.0 billion 2014 Series A 1.50% RSNs due 2020 pursuant to the terms of the related 2014 Equity Units. In connection with the remarketing, the interest rate on the junior subordinated notes was reset to 2.579%, payable on a semi-annual basis and Dominion Energy ceased to have the ability to redeem the notes at its option or defer interest payments. In June 2019, Dominion Energy successfully remarketed the $700 million 2016 Series A-1 A-2 A-1 A-2 At December 31, 2019, the securities are included in junior subordinated notes in Dominion Energy’s Consolidated Balance Sheets. Dominion Energy did not receive any proceeds from the remarketings. Remarketing proceeds belonged to the investors holding the related equity units and were temporarily used to purchase a portfolio of treasury securities. Upon maturity of each portfolio, the proceeds were applied on behalf of investors on the related stock purchase contract settlement date to pay the purchase price to Dominion Energy for issuance of 12.5 million shares of its common stock in July 2017 and 18.5 million shares of its common stock in August 2019.

Preferred Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Preferred Stock	Note 19. Preferred Stock Dominion Energy is authorized to issue up to 20 million shares of preferred stock, which may be designated into separate classes. At December 31, 2019, Dominion Energy had issued and outstanding 2.4 million shares preferred stock, 1.6 million and 0.8 million of which were designated as the Series A Preferred Stock and the Series B Preferred Stock, respectively. No shares of preferred stock were outstanding at December 31, 2018. DESC is authorized to issue up to 20 million shares of preferred stock. At December 31, 2019, DESC had issued and outstanding 1,000 shares of preferred stock, all of which were held by SCANA and are eliminated in consolidation. 2019 Corporate Units In June 2019, Dominion Energy issued $1.6 billion of 2019 Equity Units, initially in the form of 2019 Series A Corporate Units. The Corporate Units are listed on the NYSE under the symbol DCUE. The net proceeds were used for general corporate purposes and to repay short-term debt, including commercial paper. Each 2019 Series A Corporate Unit consists of a stock purchase contract and a 1/10, or 10%, undivided beneficial ownership interest in one share of Series A Preferred Stock. Beginning in June 2022, the Series A Preferred Stock is convertible at the option of the holder into Dominion Energy common stock under a formula based upon the average closing price of Dominion Energy common stock prior to the conversion date. The Series A Preferred Stock is redeemable in cash by Dominion Energy beginning September 2022 at the liquidation preference. Settlement of any conversion is payable in cash, common stock or a combination thereof, at Dominion Energy’s election. The stock purchase contracts obligate the holders to purchase shares of Dominion Energy common stock in June 2022. The purchase price to be paid under the stock purchase contracts is $100 per Corporate Unit and the number of shares to be purchased will be determined under a formula based upon the average closing price of Dominion Energy common stock near the settlement date. The Series A Preferred Stock was pledged upon issuance as collateral to secure the purchase of common stock under the related stock purchase contracts. Dominion Energy pays cumulative dividends on the Series A Preferred Stock and quarterly contract adjustment payments on the stock purchase contracts, at the rates described below. Dominion Energy may elect to pay such dividends and/or payments in cash, shares of Dominion Energy common stock or a combination of cash and shares of Dominion Energy common stock. Dominion Energy may defer the contract adjustment payments for one or more consecutive periods but generally not beyond the purchase contract settlement date. If payments are deferred, Dominion Energy may not make any distributions related to its capital stock, including dividends, redemptions, repurchases or liquidation payments. Also, during the deferral period, Dominion Energy may not make any payments on or redeem, repay or repurchase any debt securities that are equal in right of payment with, or subordinated to, the contract adjustment payments or make any payment on any guarantee of a security of a subsidiary if the guarantee ranks equal or junior to the contract adjustment payments. Unless all accumulated and unpaid dividends on the Series A Preferred Stock have been declared and paid, Dominion Energy may not make any distributions on any of its capital stock ranking equal or junior to the Series A Preferred Stock as to dividends or upon liquidation, as applicable, including dividends, redemptions, repurchases or liquidation payments. In such circumstances, Dominion Energy also may not make any contract adjustment payments or other similar types of payments, subject to certain exceptions. Dominion Energy has recorded the present value of the stock purchase contract payments as a liability offset to common stock. Stock purchase contract payments are recorded against this liability. Accretion of the stock purchase contract liability is recorded as imputed interest expense. In calculating diluted EPS, Dominion Energy applies the treasury stock method to the stock purchase contracts and the if-converted Selected information about Dominion Energy’s 2019 Equity Units is presented below: Issuance Date Units Total Net Proceeds (1) Total (2) Cumulative Dividend Rate Stock Purchase Contract Annual Stock Purchase Contract Liability (3) Stock Purchase Contract Settlement Date (millions except interest rates) 6/14/2019 16 $ 1,582 $1,610 1.75 % 5.5 % $250 6/1/2022 (1) Issuance costs of $28 million were recorded as a reduction to preferred stock ($14 million) and common stock ($14 million) in the Consolidated Balance Sheets. (2) Dominion Energy recorded dividends of $15 million ($9.479 per share) for the year ended December 31, 2019. (3) Payments of $38 million were made in 2019. The stock purchase contract liability was $212 million at December 31, 2019. Series B Preferred Stock In December 2019, Dominion Energy issued 800,000 shares of Series B Preferred Stock for $791 million, net of $9 million of issuance costs. The preferred stock has a liquidation preference of $1,000 per share and currently pays a 4.65% dividend per share on the liquidation preference. Dividends are paid cumulatively on a semi-annual basis, commencing June 15, 2020. Dominion Energy recorded dividends of $2 million ($1.9375 per share) for the year ended December 31, 2019. The dividend rate for the Series B Preferred Stock will be reset every five years beginning on December 15, 2024 to equal the then-current five-year U.S. Treasury rate plus a spread of 2.993%. Unless all accumulated and unpaid dividends on the Series B Preferred Stock have been declared and paid, Dominion Energy may not make any dis tributions on any of its capital stock ranking equal or junior to the Series B Preferred Stock as to dividends or upon liquidation, including through dividends, redemptions, repurchases or otherwise. Dominion Energy may, at its option, redeem the Series B Preferred Stock in whole or in part on December 15, 2024 or on any subsequent fifth anniversary of such date at a price equal to $1,000 per share plus any accumulated and unpaid dividends. Dominion Energy may also, at its option, redeem the Series B Preferred Stock in whole but not in part at a price equal to $1,020 per share plus any accumulated and unpaid dividends at any time within a certain period of time following any change in the criteria ratings agencies use to assign equity credit to securities such as the Series B Preferred Stock that has certain adverse effects on the equity credit actually received by the Series B Preferred Stock. Holders of the Series B Preferred Stock have no voting rights except in the limited circumstances provided for in the terms of the Series B Preferred Stock or as otherwise required by applicable law. The Series B Preferred Stock is not subject to any sinking fund or other obligation of ours to redeem, repurchase or retire the Series B Preferred Stock. The preferred stock contains no conversion rights. Virginia Power Virginia Power is authorized to issue up to 10 million shares of preferred stock, $100 liquidation preference; however, none were issued and outstanding at December 31, 2019 or 2018.

Equity

Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Equity	Note 20. Equity Common Stock Dominion Energy During 2019, 2018 and 2017, Dominion Energy recorded, net of fees and commissions, $11.0 billion, $2.5 billion and $1.3 billion from the issuance of approximately 157 million, 36 million and 17 million shares of common stock, respectively, for acquisitions, settlements of stock purchase contracts and through various programs including Dominion Energy Direct ® at-the-market Acquisitions During 2019, Dominion Energy issued 95.6 million shares of common stock in connection with the acquisition of SCANA. At the time of issuance, these common stock shares were valued at $6.8 billion. See Note 3 for further information on the issuance of Dominion Energy common stock in connection with the SCANA Combination. In January 2019, Dominion Energy and Dominion Energy Midstream closed on an agreement and plan of merger pursuant to which Dominion Energy acquired each outstanding common unit representing limited partner interests in Dominion Energy Midstream not already owned by Dominion Energy through the issuance of 22.5 million shares of common stock valued at $1.6 billion. Under the terms of the agreement and plan of merger, each publicly held outstanding common unit representing limited partner interests in Dominion Energy Midstream was converted into the right to receive 0.2492 shares of Dominion Energy common stock. Immediately prior to the closing, each Series A Preferred Unit representing limited partner interests in Dominion Energy Midstream was converted into common units representing limited partner interests in Dominion Energy Midstream in accordance with the terms of Dominion Energy Midstream’s partnership agreement. The merger was accounted for by Dominion Energy following the guidance for a change in a parent company’s ownership interest in a consolidated subsidiary. Because Dominion Energy controls Dominion Energy Midstream both before and after the merger, the changes in Dominion Energy’s ownership interest in Dominion Energy Midstream were accounted for as an equity transaction and no gain or loss was recognized. In connection with the merger, Dominion Energy recognized $40 million of income taxes in equity primarily attributable to establishing additional regulatory liabilities related to excess deferred income taxes and changes in state income taxes. Subsequent to this activity, as a result of the Dominion Energy Gas Restructuring, Dominion Energy Gas is considered to have acquired all of the outstanding partnership interests of Dominion Energy Midstream and Dominion Energy Midstream became a wholly-owned subsidiary of Dominion Energy Gas. Pension Plan Contribution In December 2019, Dominion Energy contributed 6.1 million shares of its common stock valued at $499 million to the qualified defined benefit pension plans. See Note 22 for further information regarding activity surrounding pension plan contributions. Dominion Energy Direct ® Dominion Energy maintains Dominion Energy Direct ® ® Stock Purchase Contracts In August 2019, Dominion Energy issued 18.5 million shares under the related stock purchase contracts entered into as part of Dominion Energy’s 2016 Equity Units and received proceeds of $1.4 billion. In 2017, Dominion Energy issued 12.5 million shares under the related stock purchase contracts entered into as part of Dominion Energy’s 2014 Equity Units and received proceeds of $1.0 billion. See Note 18 for further information surrounding these stock purchase contracts. At-the-Market In June 2017, Dominion Energy filed an SEC shelf registration for the sale of debt and equity securities including the ability to sell common stock through an at-the-market at-the-market at-the-market on the NYSE at market prices or in such other transactions as are agreed upon by Dominion Energy and the sales agents in conformance with applicable securities laws. In the fourth quarter of 2018, Dominion Energy provided sales instructions to two of the sales agents and issued 2.7 million shares through at-the-market Forward Sale Agreements In 2018, Dominion Energy entered into separate forward sale agreements with Goldman Sachs & Co. LLC and Credit Suisse Capital LLC, as forward purchasers, and an underwriting agreement with Credit Suisse Securities (USA) LLC and Goldman Sachs & Co. LLC, as representatives of the several underwriters named therein, relating to an aggregate of 20 million shares of Dominion Energy common stock. The underwriting agreement granted the underwriters a 30-day Repurchase of Common Stock Dominion Energy did not repurchase any shares in 2019 or 2018 and does not plan to repurchase shares during 2020, except for shares tendered by employees to satisfy tax withholding obligations on vested restricted stock, which do not count against its stock repurchase authorization. Virginia Power In 2019, 2018 and 2017, Virginia Power did not issue any shares of its common stock to Dominion Energy. Noncontrolling Interests Sale of Interest in Cove Point In December 2019, Dominion Energy completed the sale of its 25% noncontrolling limited partnership interest in Cove Point to Brookfield in exchange for cash consideration of $2.1 billion, subject to working capital adjustments. See Note 3 for further information on the sale of this interest. Remeasurement of Dominion Energy Midstream Units In May 2018, all of the subordinated units of Dominion Energy Midstream held by Dominion Energy were converted into common units on a 1:1 ratio following the payment of Dominion Energy Midstream’s distribution for the first quarter of 2018. In June 2018, Dominion Energy, as general partner, exercised an incentive distribution right reset as defined in Dominion Energy Midstream’s partnership agreement and received 27 million common units representing limited partner interests in Dominion Energy Midstream. As a result of the increase in its ownership interest in Dominion Energy Midstream, Dominion Energy recorded a decrease in noncontrolling interest, and a corresponding increase in shareholders’ equity, of $375 million reflecting the change in the carrying value of the interest in the net assets of Dominion Energy Midstream held by others. Accumulated Other Comprehensive Income (Loss) Presented in the table below is a summary of AOCI by component: At December 31, 2019 2018 (millions) Dominion Energy Net deferred losses on derivatives-hedging activities, net of $135 and $79 tax $ (407 ) $ (234 ) Net unrealized gains on nuclear decommissioning trust funds, net of $(13) and $— tax 37 2 Net unrecognized pension and other postretirement benefit costs, net of $492 and $519 tax (1,421 ) (1,465 ) Other comprehensive loss from equity method investees, net of $1 and $— tax (2 ) (2 ) Total AOCI, including noncontrolling interests $ (1,793 ) $ (1,699 ) Less other comprehensive income attributable to noncontrolling interests — 1 Total AOCI, excluding noncontrolling interests $ (1,793 ) $ (1,700 ) Virginia Power Net deferred losses on derivatives-hedging activities, net of $11 and $4 tax $ (34 ) $ (13 ) Net unrealized gains on nuclear decommissioning trust funds, net of $(1) and $— tax 5 1 Total AOCI $ (29 ) $ (12 ) Dominion Energy Gas Net deferred losses on derivatives-hedging activities, net of $28 and $8 tax $ (82 ) $ (25 ) Net unrecognized pension costs, net of $41 and $56 tax (106 ) (144 ) Total AOCI, including noncontrolling interests (188 ) (169 ) Less other comprehensive income (loss) attributable to noncontrolling interests (1 ) — Total AOCI, excluding noncontrolling interests $ (187 ) $ (169 ) Dominion Energy The following table presents Dominion Energy’s changes in AOCI by component, net of tax: Deferred Unrealized Unrecognized Other Total (millions) Year Ended December 31, 2019 Beginning balance $(235) $ 2 $(1,465 ) $(2 ) $(1,700) Other comprehensive income before reclassifications: gains (losses) (110) 39 (22) — (93) Amounts reclassified from AOCI: (gains) losses (1) (62) (4) 66 — — Net current period other comprehensive income (loss) (172) 35 44 — (93 ) Ending balance $(407) $37 $(1,421 ) $(2 ) $(1,793 ) Year Ended December 31, 2018 Beginning balance $(302) $747 $(1,101) $(3) $(659 ) Other comprehensive income before reclassifications: gains (losses) 30 (18 ) (215) 1 (202 ) Amounts reclassified from AOCI: (gains) losses (1) 102 5 78 — 185 Net current period other comprehensive income (loss) 132 (13) (137) 1 (17) Cumulative-effect of changes in accounting principle (64) (732) (227) — (1,023 ) Less other comprehensive income (loss) attributable to noncontrolling interests 1 — — — 1 Ending balance $(235) $ 2 $(1,465) $(2) $ (1,700 ) (1) See table below for details about these reclassifications. The following table presents Dominion Energy’s reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $(146) Operating revenue 3 Purchased gas Interest rate contracts 54 Interest and related charges Foreign currency contracts 6 Other Income Total (83 ) Tax 21 Income tax expense Total, net of tax $(62 ) Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $(5) Other income Total (5) Tax 1 Income tax expense Total, net of tax $(4 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $(24) Other income Amortization of actuarial losses 113 Other income Total 89 Tax (23 ) Income tax expense Total, net of tax $66 Year Ended December 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $90 Operating revenue (14 ) Purchased gas Interest rate contracts 48 Interest and related charges Foreign currency contracts 13 Other Income Total 137 Tax (35 ) Income tax expense Total, net of tax $102 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $7 Other income Total 7 Tax (2 ) Income tax expense Total, net of tax $5 Unrecognized pension and other postretirement benefit costs: Prior-service costs (credits) $(21 ) Other income Actuarial losses 120 Other income Total 99 Tax (21 ) Income tax expense Total, net of tax $78 Virginia Power The following table presents Virginia Power’s changes in AOCI by component, net of tax: Deferred Unrealized Total (millions) Year Ended December 31, 2019 Beginning balance $(13 ) $ 1 $(12) Other comprehensive income before reclassifications: gains (losses) (22 ) 5 (17) Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) (21 ) 4 (17) Ending balance $(34 ) $ 5 $(29) Year Ended December 31, 2018 Beginning balance $(12 ) $ 74 $ 62 Other comprehensive income before reclassifications: gains (losses) 1 — 1 Amounts reclassified from AOCI: gains (losses) (1) 1 — 1 Net current period other comprehensive income (loss) 2 — 2 Cumulative-effect of changes in accounting principle (3 ) (73 ) (76) Ending balance $(13 ) $ 1 $ (12) (1) See table below for details about these reclassifications. The following table presents Virginia Power’s reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 (Gains) losses on cash flow hedges: Interest rate contracts $ 1 Interest and related charges Total 1 Tax — Income tax expense Total, net of tax $ 1 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (2) Other income Impairment — Other income Total (2) Tax 1 Income tax expense Total, net of tax $ (1) Year Ended December 31, 2018 (Gains) losses on cash flow hedges: Interest rate contracts $ 1 Interest and related charges Total 1 Tax — Income tax expense Total, net of tax $ 1 Dominion Energy Gas The following table presents Dominion Energy Gas’ changes in AOCI by component, net of tax: Deferred gains Unrecognized Total (millions) Year Ended December 31, 2019 Beginning balance $(25 ) $(144 ) $ (169) Other comprehensive income before reclassifications: gains (losses) (61 ) 33 (28 ) Amounts reclassified from AOCI: (gains) losses (1) 5 5 10 Net current period other comprehensive income (loss) (56 ) 38 (18 ) Dominion Energy Gas Restructuring (1 ) — (1 ) Less other comprehensive income attributable to noncontrolling interests (1 ) — (1 ) Ending balance $(81 ) $(106 ) $ (187 ) Year Ended December 31, 2018 Beginning balance $(23 ) $(75 ) $ (98 ) Other comprehensive income before reclassifications: gains (losses) (16 ) (52 ) (68 ) Amounts reclassified from AOCI: gains (losses) (1) 19 4 23 Net current period other comprehensive income (loss) 3 (48 ) (45 ) Cumulative-effect of changes in accounting principle (5 ) (21 ) (26 ) Ending balance $(25 ) $(144 ) $(169 ) (1) See table below for details about these reclassifications. The following table presents Dominion Energy Gas’ reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (4) Net income from discontinued operations Interest rate contracts 5 Interest and related charges Foreign currency contracts 6 Other income Total 7 Tax (2) Income tax expense Total, net of tax $ 5 Unrecognized pension costs: Actuarial losses $ 7 Other income Total 7 Tax (2) Income tax expense Total, net of tax $ 5 Year Ended December 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 8 Net income from discontinued operations Interest rate contracts 5 Interest and related charges Foreign currency contracts 13 Other income Total 26 Tax (7) Income tax expense Total, net of tax $19 Unrecognized pension costs: Actuarial losses $ 6 Other income Total 6 Tax (2) Income tax expense Total, net of tax $ 4 Stock-Based Awards The 2014 Incentive Compensation Plan permits stock-based awards that include restricted stock, performance grants, goal-based stock, stock options and stock appreciation rights. The Non-Employee non-employee Goal-based stock awards are granted in lieu of cash-based performance grants to certain officers who have not achieved a certain targeted level of share ownership. As of December 31, 2019, unrecognized compensation cost related to nonvested goal-based stock awards was immaterial. Dominion Energy measures and recognizes compensation expense relating to share-based payment transactions over the vesting period based on the fair value of the equity or liability instruments issued. Dominion Energy’s results for the years ended December 31, 2019, 2018 and 2017 include $46 million, $48 million and $45 million, Restricted Stock Restricted stock grants are made to officers under Dominion Energy’s LTIP and may also be granted to certain key non-officer three Shares Weighted—average (thousands) Nonvested at December 31, 2016 886 $71.40 Granted 454 74.24 Vested (287 ) 68.90 Cancelled and forfeited (10 ) 72.37 Nonvested at December 31, 2017 1,043 $73.32 Granted 534 72.92 Vested (316 ) 73.59 Cancelled and forfeited (53 ) 74.25 Nonvested at December 31, 2018 1,208 $73.03 Granted 614 76.49 Vested (324 ) 71.75 Cancelled and forfeited (96 ) 77.16 Nonvested at December 31, 2019 1,402 $74.77 As of December 31, 2019, unrecognized compensation cost related to nonvested restricted stock awards totaled $59 million and is expected to be recognized over a weighted-average period of 2.1 years. The fair value of restricted stock awards that vested was $23 million, $23 million and $21 million in 2019, 2018 and 2017, respectively. Employees may elect to have shares of restricted stock withheld upon vesting to satisfy tax withholding obligations. The number of shares withheld will vary for each employee depending on the vesting date fair market value of Dominion Energy stock and the applicable federal, state and local tax withholding rates. Cash-Based Performance Grants Cash-based performance grants are made to Dominion Energy’s officers under Dominion Energy’s LTIP. The actual payout of cash-based performance grants will vary between zero and 200% of the targeted amount based on the level of performance metrics achieved. In February 2017, two cash-based performance grants were made to officers as Dominion Energy transitioned from a two-year two-year $13 million. Payout The In February 2018, a cash-based performance grant was made to officers. Payout of the performance grant is expected to occur by March 15, 2021 based on the achievement of two performance metrics during 2018, 2019 and 2020: TSR relative to that of companies that are members of Dominion Energy’s compensation peer group and ROIC. There are additional opportunities to earn a portion of the award based on Dominion Energy’s absolute TSR or relative price-earnings ratio performance. At December 31, 2019, the targeted amount of the three-year grant was $15 million and a liability of $8 million had been accrued for this award. In February 2019, a cash-based performance grant was made to officers. Payout of the performance grant is expected to occur by March 15, 2022 based on the achievement of two performance metrics during 2019, 2020 and 2021: TSR relative to that of companies that are members of Dominion Energy’s compensation peer group and ROIC. There are additional opportunities to earn a portion of the award based on Dominion Energy’s absolute TSR or relative price-earnings ratio performance. At December 31, 2019, the targeted amount of the three-year grant was $16 million and a liability of $5 million had been accrued for this award.

Dividend Restrictions

Dividend Restrictions	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Dividend Restrictions	Note 21. Dividend Restrictions The Virginia Commission may prohibit any public service company, including Virginia Power, from declaring or paying a dividend to an affiliate if found to be inconsistent with the public interest. At December 31, 2019, the Virginia Commission had not restricted the payment of dividends by Virginia Power. The North Carolina Commission, in its order approving the SCANA Combination, limited cumulative dividends payable to Dominion Energy by Virginia Power and PSNC to (i) the amount of retained earnings at closing of the SCANA Combination plus (ii) any future earnings recorded by Virginia Power and PSNC after such date. In addition, notice to the North Carolina Commission is required if payment of dividends causes the equity component of Virginia Power and PSNC’s capital structure to fall below 45%. The Ohio Commission may prohibit any public service company, including East Ohio, from declaring or paying a dividend to an affiliate if found to be detrimental to the public interest. At December 31, 2019, the Ohio Commission had not restricted the payment of dividends by East Ohio. Pursuant to the SCANA Merger Approval Order, the amount of any DESC dividends paid must be reasonable and consistent with the long-term payout ratio of the electric utility industry and gas distribution industry. There is no specific restriction on the payment of dividends by DESC. At December 31, 2019, DESC’s retained earnings are below the balance established by the Federal Power Act as a reserve on earnings attributable to hydroelectric generation plants. As a result, DESC is prohibited from the payment of dividends without regulatory approval until the balance of its retained earnings increases. The Utah Commission may prohibit any public service company, including Questar Gas, from declaring or paying a dividend to an affiliate if found to be detrimental to the public interest. At December 31, 2019, the Utah Commission had not restricted the payment of dividends by Questar Gas. Certain agreements associated with the Companies’ credit facility contain restrictions on the ratio of debt to total capitalization. These limitations did not restrict the Companies’ ability to pay dividends or receive dividends from their subsidiaries at December 31, 2019. In connection with the SCANA Combination, under the terms of the merger agreement, Dominion Energy could not declare, set aside or pay any dividends on, or make any other distributions (whether in cash, stock or property) in respect of, any of its capital stock, other than regular quarterly cash dividends from January 2018 through January 2019. As part of the merger agreement with Dominion Energy Midstream from November 2018 through January 2019, Dominion Energy could not declare, set aside or pay any dividends on, or make any other distributions (whether in cash, stock or property) in respect of, any of its capital stock, other than regular quarterly cash dividends. See Notes 18 and 19 for a description of potential restrictions on common stock dividend payments by Dominion Energy in connection with the deferral of contract adjustment payments on the 2019 Equity Units or a failure to pay dividends on the Series A Preferred Stock or Series B Preferred Stock.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Note 22. Employee Benefit Plans Dominion Energy and Dominion Energy Gas—Defined Benefit Plans Dominion Energy provides certain retirement benefits to eligible active employees, retirees and qualifying dependents. Dominion Energy Gas participates in a number of the Dominion Energy-sponsored retirement plans. Under the terms of its benefit plans, Dominion Energy reserves the right to change, modify or terminate the plans. From time to time in the past, benefits have changed, and some of these changes have reduced benefits. Dominion Energy maintains qualified noncontributory defined benefit pension plans covering virtually all employees. Retirement benefits are based primarily on years of service, age and the employee’s compensation. Dominion Energy’s funding policy is to contribute annually an amount that is in accordance with the provisions of ERISA. The pension programs also provide benefits to certain retired executives under company-sponsored nonqualified employee benefit plans. The nonqualified plans are funded through contributions to grantor trusts. Dominion Energy also provides retiree healthcare and life insurance benefits with annual employee premiums based on several factors such as age, retirement date and years of service. Pension benefits for Dominion Energy Gas employees not represented by collective bargaining units are covered by the Dominion Energy Pension Plan, a defined benefit pension plan sponsored by Dominion Energy that provides benefits to multiple Dominion Energy subsidiaries. Pension benefits for Dominion Energy Gas employees represented by collective bargaining units are covered by a sep a Retiree healthcare and life insurance benefits for Dominion Energy Gas employees not represented by collective bargaining units are covered by the Dominion Energy Retiree Health and Welfare Plan, a plan sponsored by Dominion Energy that provides certain retiree healthcare and life insurance benefits to multiple Dominion Energy subsidiaries. Retiree healthcare and life insurance benefits for Dominion Energy Gas employees represented by collective bargaining units are covered by a sep a Dominion Energy Gas included the separate pension and other postretirement benefit plans for East Ohio employees covered by collective bargaining units through November 2019, the effective date of the Dominion Energy Gas Restructuring. See Note 3 for more information on the Dominion Energy Gas Restructuring. Pension and other postretirement benefit costs are affected by employee demographics (including age, compensation levels and years of service), the level of contributions made to the plans and earnings on plan assets. These costs may also be affected by changes in key assumptions, including expected long-term rates of return on plan assets, discount rates, healthcare cost trend rates, mortality rates and the rate of compensation increases. Dominion Energy uses December 31 as the measurement date for all of its employee benefit plans, including those in which Dominion Energy Gas participates. Dominion Energy uses the market-related value of pension plan assets to determine the expected return on plan assets, a component of net periodic pension cost, for all pension plans, including those in which Dominion Energy Gas participates. The market-related value recognizes changes in fair value on a straight-line basis over a four-year period, which reduces year-to-year Dominion Energy’s pension and other postretirement benefit plans hold investments in trusts to fund employee benefit payments. Dominion Energy’s pension and other postretirement plan assets experienced aggregate actual returns (losses) of $2.1 billion and $(605) million in 2019 and 2018, respectively, versus expected returns of $848 million and $806 million, respectively. Dominion Energy Gas’ pension and other postretirement plan assets for employees represented by collective bargaining units experienced aggregate actual returns (losses) of $167 million and $(129) million in 2019 and 2018, respectively, versus expected returns of $70 million and $178 million, respectively. Differences between actual and expected returns on plan assets are accumulated and amortized during future periods. As such, any investment-related declines in these trusts will result in future increases in the net periodic cost recognized for such employee benefit plans and will be included in the determination of the amount of cash to be contributed to the employee benefit plans. Voluntary Retirement Program In March 2019, the Companies announced a voluntary retirement program to employees that meet certain age and service requirements. The voluntary retirement program will not compromise safety or the Companies’ ability to comply with applicable laws and regulations. In 2019, upon the determinations made concerning the number of employees that elected to participate in the program, Dominion Energy recorded a charge of $427 million ($319 million after-tax) after-tax) after-tax) In the second quarter of 2019, Dominion Energy and Dominion Energy Gas remeasured their pension and other postretirement benefit plans as a result of the voluntary retirement program. The remeasurement resulted in an increase in the pension benefit obligation of $484 million and $32 million and an increase in the fair value of the pension plan assets of $671 million and $146 million for Dominion Energy and Dominion Energy Gas, respectively. In addition, the remeasurement resulted in an increase in the accumulated postretirement benefit obligation of $101 million and $8 million and an increase in the fair value of the other postretirement benefit plan assets of $156 million and $29 million for Dominion Energy and Dominion Energy Gas, respectively. The impact of the remeasurement on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The discount rate used for the remeasurement was 4.07%—4.10% for the Dominion Energy pension plans, 4.10% for Dominion Energy Gas pension plans, 4.05%—4.08% for the Dominion Energy other postretirement benefit plans, and 4.05% for the Dominion Energy Gas other postretirement benefit plans. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018. In the third quarter of 2019, Dominion Energy remeasured a pension plan as a result of a settlement from the voluntary retirement program at SCANA. The settlement and related remeasurement resulted in an increase in the pension benefit obligation of $37 million and an increase in the fair value of the pension plan assets of $51 million for Dominion Energy. The impact of the remeasurement on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The discount rate used for the remeasurement was 3.57%. All other assumptions used for the remeasurement were consistent with the measurement as of December 31, 2018. Funded Status The following table summarizes the changes in pension plan and other postretirement benefit plan obligations and plan assets and includes a statement of the plans’ funded status for Dominion Energy and Dominion Energy Gas (for employees represented by collective bargaining units): Pension Benefits Other Postretirement Benefits Year Ended December 31, 2019 2018 2019 2018 (millions, except percentages) Dominion Energy Changes in benefit obligation: Benefit obligation at beginning of year $ 8,500 $ 9,052 $ 1,363 $ 1,529 Dominion Energy SCANA Combination (See Note 3) 854 — 253 — Service cost 162 157 26 27 Interest cost 394 337 68 56 Benefits paid (470 ) (358 ) (96 ) (87 ) Actuarial (gains) losses during the year 1,054 (688 ) 111 (158 ) Plan amendments — — — (4 ) Settlements and curtailments (1) (48 ) — 44 — Benefit obligation at end of year $ 10,446 $ 8,500 $ 1,769 $ 1,363 Changes in fair value of plan assets: Fair value of plan assets at beginning of year $ 7,197 $ 8,062 $ 1,581 $ 1,729 Dominion Energy SCANA Combination (See Note 3) 727 — — — Actual return (loss) on plan assets 1,747 (513 ) 349 (92 ) Employer contributions 557 6 12 12 Benefits paid (470 ) (358 ) (62 ) (68 ) Settlements (2) (127 ) — — — Fair value of plan assets at end of year $ 9,631 $ 7,197 $ 1,880 $ 1,581 Funded status at end of year $ (815 ) $ (1,303 ) $ 111 $ 218 Amounts recognized in the Consolidated Balance Sheets at December 31: Noncurrent pension and other postretirement benefit assets $ 1,266 $ 1,003 $ 442 $ 276 Other current liabilities (29 ) (34 ) (17 ) (2 ) Noncurrent pension and other postretirement benefit liabilities (2,052 ) (2,272 ) (314 ) (56 ) Net amount recognized $ (815 ) $ (1,303 ) $ 111 $ 218 Significant assumptions used to determine benefit obligations as of December 31: Discount rate 3.47%–3.63% 4.42%–4.43% 3.44%–3.52% 4.37%–4.38% Weighted average rate of increase for compensation 4.23% 4.32% n/a n/a Dominion Energy Gas Changes in benefit obligation: Benefit obligation at beginning of year $ 730 $ 773 $ 256 $ 290 Dominion Energy Gas Restructuring (See Note 3) (468 ) — (135 ) — Service cost 6 18 1 4 Interest cost 11 29 5 11 Benefits paid (15 ) (34 ) (8 ) (18 ) Actuarial (gains) losses during the year 30 (56 ) 1 (27 ) Plan amendments — — — (4 ) Settlements and curtailments (1) 1 — 1 — Benefit obligation at end of year $ 295 $ 730 $ 121 $ 256 Changes in fair value of plan assets: Fair value of plan assets at beginning of year $ 1,656 $ 1,803 $ 311 $ 333 Dominion Energy Gas Restructuring (1,084 ) — $ (126 ) — Actual return (loss) on plan assets 129 (113 ) 38 (16 ) Employer contributions — — 12 12 Benefits paid (15 ) (34 ) (8 ) (18 ) Fair value of plan assets at end of year $ 686 $ 1,656 $ 227 $ 311 Funded status at end of year $ 391 $ 926 $ 106 $ 55 Amounts recognized in the Consolidated Balance Sheets at December 31: Noncurrent pension and other postretirement benefit assets $ 391 $ 310 $ 106 $ 63 Noncurrent assets of discontinued operations — 616 — — Noncurrent liabilities of discontinued operations — — — (8 ) Net amount recognized $ 391 $ 926 $ 106 $ 55 Significant assumptions used to determine benefit obligations as of December 31: Discount rate 3.63 % 4.42 % 3.44 % 4.37 % Weighted average rate of increase for compensation 4.64 % 4.55 % n/a n/a (1) 2019 amounts relate primarily to a settlement as a result of the voluntary retirement program. The ABO for all of Dominion Energy’s defined benefit pension plans was $9.7 billion and $7.8 billion at December 31, 2019 and 2018, respectively. The ABO for the defined benefit pension plans covering Dominion Energy Gas employees represented by collective bargaining units was $279 million and $689 million at December 31, 2019 and 2018, respectively. Under its funding policies, Dominion Energy evaluates plan funding requirements annually, usually in the fourth quarter after receiving updated plan information from its actuary. Based on the funded status of each plan and other factors, Dominion Energy determines the amount of contributions for the current year, if any, at that time. During 2019, Dominion Energy made $520 million of contributions to its qualified defined benefit pension plans, including 6.1 million shares of its common stock valued at $499 million. The shares were contributed through a private placement, exempt from registration requirements, with an independent fiduciary and investment manager to a separate account within the qualified defined benefit pension plans. Dominion Energy also entered into a registration rights agreement with the independent fiduciary and investment manager pursuant to which Dominion Energy agreed to provide registrations rights on customary terms with respect to the shares. Dominion Energy Gas did not make any contributions to its qualified defined benefit pension plans in 2019. Dominion Energy expects to make $29 million of the minimum required contributions in 2020, and no contributions are currently expected in 2020 for Dominion Energy Gas. Certain regulatory authorities have held that amounts recovered in utility customers’ rates for other postretirement benefits, in excess of benefits actually paid during the year, must be deposited in trust funds dedicated for the sole purpose of paying such benefits. Accordingly, certain of Dominion Energy’s subsidiaries, including Dominion Energy Gas, fund other postretirement benefit costs through VEBAs. Dominion Energy’s remaining subsidiaries do not prefund other postretirement benefit costs but instead pay claims as presented. Dominion Energy’s contributions to VEBAs, all of which pertained to Dominion Energy Gas employees, totaled $12 million for 2019 and 2018, and Dominion Energy expects to contribute approximately $12 million to the Dominion Energy VEBAs in 2020, all of which pertains to Dominion Energy Gas employees. Dominion Energy and Dominion Energy Gas do not expect any pension or other postretirement plan assets to be returned during 2020. The following table provides information on the benefit obligations and fair value of plan assets for plans with a benefit obligation in excess of plan assets for Dominion Energy and Dominion Energy Gas (for employees represented by collective bargaining units): Pension Benefits Other Postretirement Benefits As of December 31, 2019 2018 2019 2018 (millions) Dominion Energy Benefit obligation $ 9,552 $ 7,705 $ 341 $ 164 Fair value of plan assets 7,471 5,398 10 136 Dominion Energy Gas Benefit obligation $ — $ — $ — $ 134 Fair value of plan assets — — — 126 The following table provides information on the ABO and fair value of plan assets for Dominion Energy’s pension plans with an ABO in excess of plan assets: As of December 31, 2019 2018 (millions) Accumulated benefit obligation $ 8,852 $ 7,056 Fair value of plan assets 7,471 5,398 The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans: Estimated Future Benefit Payments Pension Benefits Other Postretirement Benefits (millions) Dominion Energy 2020 $ 535 $ 120 2021 472 117 2022 511 116 2023 519 114 2024 536 113 2025-2029 2,792 528 Dominion Energy Gas 2020 $ 15 $ 8 2021 15 8 2022 15 8 2023 15 8 2024 15 8 2025-2029 79 36 Plan Assets Dominion Energy’s overall objective for investing its pension and other postretirement plan assets is to achieve appropriate long-term rates of return commensurate with prudent levels of risk. As a participating employer in various pension plans sponsored by Dominion Energy, Dominion Energy Gas is subject to Dominion Energy’s investment policies for such plans. To minimize risk, funds are broadly diversified among asset classes, investment strategies and investment advisors. The strategic target asset allocations for Dominion Energy’s pension funds are 28% U.S. equity, 18% non-U.S. large-cap, mid-cap small-cap Non-U.S. large-cap small-cap non-U.S. Dominion Energy also utilizes common/collective trust funds as an investment vehicle for its defined benefit plans. A common/collective trust fund is a pooled fund operated by a bank or trust company for investment of the assets of various organizations and individuals in a well-diversified portfolio. Common/collective trust funds are funds of grouped assets that follow various investment strategies. Strategic investment policies are established for Dominion Energy’s prefunded benefit plans based upon periodic asset/liability studies. Factors considered in setting the investment policy include employee demographics, liability growth rates, future discount rates, the funded status of the plans and the expected long-term rate of return on plan assets. Deviations from the plans’ strategic allocation are a function of Dominion Energy’s assessments regarding short-term risk and reward opportunities in the capital markets and/or short-term market movements which result in the plans’ actual asset allocations varying from the strategic target asset allocations. Through periodic rebalancing, actual allocations are brought back in line with the target. Future asset/liability studies will focus on strategies to further reduce pension and other postretirement plan risk, while still achieving attractive levels of returns. Financial derivatives may be used to obtain or manage market exposures and to hedge assets and liabilities. For fair value measurement policies and procedures related to pension and other postretirement benefit plan assets, see Note 6. The fair values of Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) pension plan assets by asset category are as follows: At December 31, 2019 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Dominion Energy Cash and cash equivalents $ 22 $ 1 $ — $ 23 $ 17 $ 1 $— $ 18 Common and preferred stocks: U.S. (1) 2,284 — — 2,284 1,645 — — 1,645 International 1,634 — — 1,634 1,061 — — 1,061 Insurance contracts — 360 — 360 — 318 — 318 Corporate debt instruments 273 859 — 1,132 23 729 — 752 Government securities 58 757 — 815 25 605 — 630 Total recorded at fair value $ 4,271 $ 1,977 $— $ 6,248 $ 2,771 $ 1,653 $— $ 4,424 Assets recorded at NAV (2) Common/collective trust funds 2,355 1,849 Alternative investments: Real estate funds 91 108 Private equity funds 787 633 Debt funds 159 155 Hedge funds 14 17 Total recorded at NAV $ 3,406 $ 2,762 Total investments (3) $ 9,654 $ 7,186 Dominion Energy Gas Cash and cash equivalents $ 1 $ — $ — $ 1 $ 4 $ — $— $ 4 Common and preferred stocks: U.S. 177 — — 177 378 — — 378 International 114 — — 114 244 — — 244 Insurance contracts — 28 — 28 — 73 — 73 Corporate debt instruments 3 66 — 69 5 168 — 173 Government securities 2 59 — 61 6 139 — 145 Total recorded at fair value $ 297 $ 153 $— $ 450 $ 637 $ 380 $— $ 1,017 Assets recorded at NAV (2) Common/collective trust funds 157 425 Alternative investments: Real estate funds 7 25 Private equity funds 61 146 Debt funds 12 36 Hedge funds 1 4 Total recorded at NAV $ 238 $ 636 Total investments (4) $ 688 $ 1,653 (1) Includes $508 million of Dominion Energy common stock at December 31, 2019. (2) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. (3) Excludes net assets related to pending sales of securities of $52 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $99 million at December 31, 2019. Excludes net assets related to pending sales of securities of $12 million, net accrued income of $21 million, and includes net assets related to pending purchases of securities of $22 million at December 31, 2018. (4) Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $6 million at December 31, 2019. Excludes net assets related to pending sales of securities of $3 million, net accrued income of $5 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2018. The fair values of Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) other postretirement plan assets by asset category are as follows: At December 31, 2019 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Dominion Energy Cash and cash equivalents $ 2 $ — $— $ 2 $ 1 $ 1 $— $ 2 Common and preferred stocks: U.S. 719 — — 719 554 — — 554 International 206 — — 206 170 — — 170 Insurance contracts — 21 — 21 — 19 — 19 Corporate debt instruments 1 50 — 51 1 44 — 45 Government securities 2 44 — 46 2 37 — 39 Total recorded at fair value $ 930 $ 115 $— $ 1,045 $ 728 $ 101 $— $ 829 Assets recorded at NAV (1) Common/collective trust funds 717 650 Alternative investments: Real estate funds 8 10 Private equity funds 100 80 Debt funds 10 10 Hedge funds 1 1 Total recorded at NAV $ 836 $ 751 Total investments (2) $ 1,881 $ 1,580 Dominion Energy Gas Common and preferred stocks: U.S. $ 86 $ — $— $ 86 $ 113 $ — $— $ 113 International 21 — — 21 30 — — 30 Total recorded at fair value $ 107 $ — $— $ 107 $ 143 $ — $— $ 143 Assets recorded at NAV (1) Common/collective trust funds 105 148 Alternative investments: Real estate funds 1 2 Private equity funds 14 18 Debt funds — — Total recorded at NAV $ 120 $ 168 Total investments $ 227 $ 311 (1) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. (2) Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2019. Excludes net assets related to pending sales of securities of $1 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2018. The Plan’s investments are determined based on the fair values of the investments and the underlying investments, which have been determined as follows: • Cash and Cash Equivalents • Common and Preferred Stocks • Insurance Contracts • Corporate Debt Instruments • Government Securities • Common/Collective Trust Funds • Alternative Investments Net Periodic Benefit (Credit) Cost The service cost component and non-service Pension Benefits Other Postretirement Benefits Year Ended December 31, 2019 2018 2017 2019 2018 2017 (millions, except percentages) Dominion Energy Service cost $ 162 $ 157 $ 138 $ 26 $ 27 $ 26 Interest cost 394 337 345 68 56 60 Expected return on plan assets (708 ) (663 ) (639 ) (140 ) (143 ) (128 ) Amortization of prior service (credit) cost 1 1 1 (52 ) (52 ) (51 ) Amortization of net actuarial loss 172 193 162 10 11 13 Settlements and curtailments 72 — — 42 — — Net periodic benefit (credit) cost $ 93 $ 25 $ 7 $ (46 ) $ (101 ) $ (80 ) Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities: Current year net actuarial (gain) loss $ 16 $ 490 $ 142 $ (98 ) $ 78 $ 12 Prior service (credit) cost — — 5 2 (4 ) (73 ) Settlements and curtailments 6 — 1 — — 2 Less amounts included in net periodic benefit cost: Amortization of net actuarial loss (172 ) (193 ) (162 ) (10 ) (11 ) (13 ) Amortization of prior service credit (cost) (1 ) (1 ) (1 ) 52 52 51 Total recognized in other comprehensive income and regulatory assets and liabilities $ (151 ) $ 296 $ (15 ) $ (54 ) $ 115 $ (21 ) Significant assumptions used to determine periodic cost: Discount rate 3.57%- % 3.80%-3.81 % 3.31%-4.50 % 4.05% - % 3.76 % 3.92%-4.47 % Expected long-term rate of return on plan assets 7.00%- % 8.75 % 8.75 % 8.50 % 8.50 % 8.50 % Weighted average rate of increase for compensation 4.20 % 4.09 % 4.09 % n/a n/a n/a Healthcare cost trend rate (1) 6.50% - % 7.00 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (1) 5.00 % 5.00 % 5.00 % Year that the rate reaches the ultimate trend rate (1) 2023-2025 2022 2021 Dominion Energy Gas (2) Service cost $ 6 $ 18 $ 15 $ 1 $ 4 $ 4 Interest cost 11 29 30 5 11 12 Expected return on plan assets (54 ) (150 ) (141 ) (16 ) (28 ) (24 ) Amortization of prior service (credit) cost — — — (5 ) (4 ) (3 ) Amortization of net actuarial loss 7 19 16 3 3 2 Settlements and curtailments 1 — — 1 — — Net periodic benefit (credit) cost $ (29 ) $ (84 ) $ (80 ) $ (11 ) $ (14 ) $ (9 ) Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities: Current year net actuarial (gain) loss $ (46 ) $ 207 $ (75 ) $ (21 ) $ 16 $ 18 Prior service cost — — — — (4 ) (61 ) Less amounts included in net periodic benefit cost: Amortization of net actuarial loss (7 ) (19 ) (16 ) (3 ) (3 ) (2 ) Amortization of prior service credit (cost) — — — 5 4 3 Total recognized in other comprehensive income and regulatory assets and liabilities $ (53 ) $ 188 $ (91 ) $ (19 ) $ 13 $ (42 ) Significant assumptions used to determine periodic cost: Discount rate 4.10%-4.42 % 3.81 % 4.50 % 4.05%-4.37 % 3.81 % 4.47 % Expected long-term rate of return on plan assets 8.65 % 8.75 % 8.75 % 8.50 % 8.50 % 8.50 % Weighted average rate of increase for compensation 4.55 % 4.11 % 4.11 % n/a n/a n/a Healthcare cost trend rate (1) 6.50 % 7.00 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (1) 5.00 % 5.00 % 5.00 % Year that the rate reaches the ultimate trend rate (1) 2025 2022 2021 (1) Assumptions used to determine net periodic cost for the following year. (2) Amounts related to East Ohio are presented within discontinued operations. The components of AOCI and regulatory assets and liabilities for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans that have not been recognized as components of net periodic benefit (credit) cost are as follows: Pension Benefits Other Postretirement Benefits At December 31, 2019 2018 2019 2018 (millions) Dominion Energy Net actuarial loss $ 3,327 $ 3,477 $ 241 $ 350 Prior service (credit) cost 5 7 (339 ) (393 ) Total (1) $ 3,332 $ 3,484 $ (98 ) $ (43 ) Dominion Energy Gas Net actuarial loss $ 150 $ 555 $ 44 $ 89 Prior service (credit) cost — — (49 ) (52 ) Total (2) $ 150 $ 555 $ (5 ) $ 37 (1) As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. (2) As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in noncurrent assets of discontinued operations; of the , $22 million in noncurrent assets of discontinued operations with the remainder included The following table provides the components of AOCI and regulatory assets and liabilities for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans as of December 31, 2019 that are expected to be amortized as components of net periodic benefit (credit) cost in 2020: Pension Benefits Other Benefits (millions) Dominion Energy Net actuarial loss $194 $5 Prior service (credit) cost 1 (50 ) Dominion Energy Gas Net actuarial loss $7 $2 Prior service (credit) cost — (5 ) The expected long-term rates of return on plan assets, discount rates, healthcare cost trend rates and mortality are critical assumptions in determining net periodic benefit (credit) cost. Dominion Energy develops non-investment Dominion Energy determines the expected long-term rates of return on plan assets for its pension plans and other postretirement benefit plans, including those in which Dominion Energy Gas participates, by using a combination of: • Expected inflation and risk-free interest rate assumptions; • Historical return analysis to determine long term historic returns as well as historic risk premiums for various asset classes; • Expected future risk premiums, asset classes’ volatilities and correlations; • Forward-looking return expectations derived from the yield on long-term bonds and the expected long-term returns of major capital market assumptions; and • Investment allocation of plan assets. Dominion Energy determines discount rates from analyses of AA/Aa rated bonds with cash flows matching the expected payments to be made under its plans, including those in which Dominion Energy Gas participates. Mortality rates are developed from actual and projected plan experience for postretirement benefit plans. Dominion Energy’s actuary conducts an experience study periodically as part of the process to select its best estimate of mortality. Dominion Energy considers both standard mortality tables and improvement factors as well as the plans’ actual experience when selecting a best estimate. Assumed healthcare cost trend rates have a significant effect on the amounts reported for Dominion Energy’s retiree healthcare plans, including those in which Dominion Energy Gas participates. A one percentage point change in assumed healthcare cost trend rates would have had the following effects for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) other postretirement benefit plans: Other Postretirement Benefits One percentage point increase One percentage point decrease (millions) Dominion Energy Effect on net periodic cost for 2020 $20 $(11) Effect on other postretirement benefit obligation at December 31, 2019 153 (128) Dominion Energy Gas Effect on net periodic cost for 2020 $2 $(2) Effect on other postretirement benefit obligation at December 31, 2019 14 (12) Dominion Energy Gas (Employees Not Represented by Collective Bargaining Units) and Virginia Power—Participation in Defined Benefit Plans Virginia Power employees and Dominion Energy Gas employees not represented by collective bargaining units are covered by the Dominion Energy Pension Plan described above. As participating employers, Virginia Power and Dominion Energy Gas are subject to Dominion Energy’s funding policy, which is to contribute annually an amount that is in accordance with ERISA. During 2019, Virginia Power and Dominion Energy Gas made no contributions to the Dominion Energy Pension Plan, and no contributions to this plan are currently expected in 2020. Virginia Power’s net periodic pension cost related to this plan was $152 million, $126 million and $110 million in 2019, 2018 and 2017, respectively. Dominion Energy Gas’ net periodic pension credit related to this plan was $(8) million, $(35) million and $(35) million in 2019, 2018 and 2017, respectively. Net periodic pension (credit) cost is reflected in other operations and maintenance expense in their respective Consolidated Statements of Income, except for $(14) million, $(21) million and $(20) million of Dominion Energy Gas’ costs in 2019, 2018 and 2017, respectively, that are recorded in net income from discontinued operations. The funded status of various Dominion Energy subsidiary groups and employee compensation are the basis for determining the share of total pension costs for participating Dominion Energy subsidiaries. See Note 25 for Virginia Power and Dominion Energy Gas amounts due to/from Dominion Energy related to this plan. Retiree healthcare and life insurance benefits, for Virginia Power employees and for Dominion Energy Gas employees not represented by collective bargaining units, are covered by the Dominion Energy Retiree Health and Welfare Plan described above. Virginia Power’s net periodic benefit (credit) cost related to this plan was $(27) million, $(51) million and $(42) million in 2019, 2018 and 2017, respectively. Dominion Energy Gas’ net periodic benefit (credit) cost related to this plan was $(4) million, $(8) million and $(6) million for 2019, 2018 and 2017, respectively. Net periodic benefit (credit) cost is reflected in other operations and maintenance expenses in their respective Consolidated Statements of Income, except for less than $(1 ) million, $(2) million and $(2) million of Dominion Energy Gas’ costs in 2019, 2018 and 2017, respectively, that are recorded in net income from discontinued operations. Employee headcount is the basis for determining the share of total other postretirement benefit costs for participating Dominion Energy subsidiaries. See Note 25 for Virginia Power and Dominion Energy Gas amounts due to/from Dominion Energy related to this plan. Dominion Energy holds investments in trusts to fund employee benefit payments for the pension and other postretirement benefit plans in which Virginia Power and Dominion Energy Gas’ employees participate. Any investment-related declines in these trusts will result in future increases in the net periodic cost recognized for such employee benefit plans and will be included in the determination of the amount of cash t

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Note 23. Commitments and Contingencies As a result of issues generated in the ordinary course of business, the Companies are involved in legal proceedings before various courts and are periodically subject to governmental examinations (including by regulatory authorities), inquiries and investigations. Certain legal proceedings and governmental examinations involve demands for unspecified amounts of damages, are in an initial procedural phase, involve uncertainty as to the outcome of pending appeals or motions, or involve significant factual issues that need to be resolved, such that it is not possible for the Companies to estimate a range of possible loss. For such matters that the Companies cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the litigation or investigative processes such that the Companies are able to estimate a range of possible loss. For legal proceedings and governmental examinations that the Companies are able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any accrued liability is recorded on a gross basis with a receivable also recorded for any probable insurance recoveries. Estimated ranges of loss are inclusive of legal fees and net of any anticipated insurance recoveries. Any estimated range is based on currently available information and involves elements of judgment and significant uncertainties. Any estimated range of possible loss may not represent the Companies’ maximum possible loss exposure. The circumstances of such legal proceedings and governmental examinations will change from time to time and actual results may vary significantly from the current estimate. For current proceedings not specifically reported below, management does not anticipate that the liabilities, if any, arising from such proceedings would have a material effect on the Companies’ financial position, liquidity or results of operations. Environmental Matters The Companies are subject to costs resulting from a number of federal, state and local laws and regulations designed to protect human health and the environment. These laws and regulations affect future planning and existing operations. They can result in increased capital, operating and other costs as a result of compliance, remediation, containment and monitoring obligations. Air CAA The CAA, as amended, is a comprehensive program utilizing a broad range of regulatory tools to protect and preserve the nation’s air quality. At a minimum, states are required to establish regulatory programs to address all requirements of the CAA. However, states may choose to develop regulatory programs that are more restrictive. Many of the Companies’ facilities are subject to the CAA’s permitting and other requirements. MATS In February 2019, the EPA published a proposed rule to reverse its previous finding that it is appropriate and necessary to regulate toxic emissions from power plants. However, the emissions standards and other requirements of the MATS rule would remain in place as the EPA is not proposing to remove coal and oil-fired Ozone Standards The EPA published final non-attainment Oil and Gas NSPS In August 2012, the EPA issued an NSPS impacting new and modified facilities in the natural gas production and gathering sectors and made revisions to the NSPS for natural gas processing and transmission facilities. These rules establish equipment performance specifications and emissions standards for control of VOC emissions for natural gas production wells, tanks, pneumatic controllers, and compressors in the upstream sector. In June 2016, the EPA issued another NSPS regulation, for the oil and natural gas sector, to regulate methane and VOC emissions from new and modified facilities in transmission and storage, gathering and boosting, production and processing facilities. All projects which commenced construction after September 2015 are required to comply with this regulation. In October 2018, the EPA published a proposed rule reconsidering and amending portions of the 2016 rule, including but not limited to, the fugitive emissions requirements at well sites and compressor stations. The amended portions of the 2016 rule were effective immediately upon publication. Until the proposed rule regarding reconsideration is final, Dominion Energy and Dominion Energy Gas are implementing the 2016 regulation. Dominion Energy and Dominion Energy Gas are still evaluating whether potential impacts on results of operations, financial condition and/or cash flows related to this matter will be material. ACE Rule In July 2019, the EPA published the final rule informally referred to as the ACE Rule, as a replacement for the Clean Power Plan. ACE Rule applies to existing coal-fired power plants. The final rule includes unit-specific performance standards based on the degree of emission reduction levels achievable from unit efficiency improvements to be determined by the permitting agency. The ACE Rule requires states to develop plans by July 2022, to implement these performance standards. These state plans must be approved by the EPA by January 2024. While the impacts of this rule could be material to Dominion Energy and Virginia Power’s results of operations, financial condition and/or cash flows, the existing regulatory frameworks in South Carolina and Virginia provide rate recovery mechanisms that could substantially mitigate any such impacts for the regulated electric utilities. Carbon Regulations In August 2016, the EPA issued a draft rule proposing to reaffirm that a source’s obligation to obtain a PSD or Title V permit for GHGs is triggered only if such permitting requirements are first triggered by non-GHG, In December 2018, the EPA proposed revised Standards of Performance for Greenhouse Gas Emissions from New, Modified, and Reconstructed Stationary Sources. The proposed rule would amend the previous determination that the best system of emission reduction for newly constructed coal-fired steam generating units is no longer partial carbon capture and storage. Instead, the proposed revised best system of emission reduction for this source category is the most efficient demonstrated steam cycle (e.g., supercritical steam conditions for large units and subcritical steam conditions for small units) in combination with the best operating practices. State Regulations In May 2019, VDEQ issued a final rule establishing a state carbon regulation program with a 28.0 million ton initial state-wide carbon cap in 2020. The cap is reduced by approximately three percent per year through 2030, resulting in an ultimate cap of 19.6 million tons. The final rule includes a provision for VDEQ to delay implementation of the rule and possible adjustments to the baseline cap pending authorization from the General Assembly and Governor of Virginia. Once VDEQ is authorized to begin implementation of the rule, the impacts of this program could be material to Dominion Energy and Virginia Power’s results of operations, financial condition and/or cash flows; however, the existing regulatory framework in Virginia provides rate recovery mechanisms that could substantially mitigate any such impact. Water The CWA, as amended, is a comprehensive program requiring a broad range of regulatory tools including a permit program to authorize and regulate discharges to surface waters with strong enforcement mechanisms. The Companies must comply with applicable aspects of the CWA programs at their operating facilities. Regulation 316(b) In October 2014, the final regulations under Section 316(b) of the CWA that govern existing facilities and new units at existing facilities that employ a cooling water intake structure and that have flow levels exceeding a minimum threshold became effective. The rule establishes a national standard for impingement based on seven compliance options, but forgoes the creation of a single technology standard for entrainment. Instead, the EPA has delegated entrainment technology decisions to state regulators. State regulators are to make case-by-case case-by-case Effluent Limitations Guidelines In September 2015, the EPA released a final rule to revise the Effluent Limitations Guidelines for the Steam Electric Power Generating Category. The final rule establishes updated standards for wastewater discharges that apply primarily at coal and oil steam generating stations. Affected facilities are required to convert from wet to dry or closed cycle coal ash management, improve existing wastewater treatment systems and/or install new wastewater treatment technologies in order to meet the new discharge limits. In April 2017, the EPA granted two separate petitions for reconsideration of the Effluent Limitations Guidelines final rule and stayed future compliance dates in the rule. Also in April 2017, the U.S. Court of Appeals for the Fifth Circuit granted the EPA’s request for a stay of the pending consolidated litigation challenging the rule while the EPA addresses the petitions for reconsideration. In September 2017, the EPA signed a rule to postpone the earliest compliance dates for certain waste streams regulations in the Effluent Limitations Guidelines final rule from November 2018 to November 2020; however, the latest date for compliance for these regulations remains December 2023. While the impacts of this rule could be material to Dominion Energy and Virginia Power’s results of operations, financial condition and/or cash flows, the existing regulatory frameworks in South Carolina and Virginia provide rate recovery mechanisms that could substantially mitigate any such impacts for the regulated electric utilities. Waste Management and Remediation The operations of the Companies are subject to a variety of state and federal laws and regulations governing the management and disposal of solid and hazardous waste, and release of hazardous substances associated with current and/or historical operations. The CERCLA, as amended, and similar state laws, may impose joint, several and strict liability for cleanup on potentially responsible parties who owned, operated or arranged for disposal at facilities affected by a release of hazardous substances. In addition, many states have created programs to incentivize voluntary remediation of sites where historical releases of hazardous substances are identified and property owners or responsible parties decide to initiate cleanups. From time to time, Dominion Energy, Virginia Power or Dominion Energy Gas may be identified as a potentially responsible party in connection with the alleged release of hazardous substances or wastes at a site. Under applicable federal and state laws, the Companies could be responsible for costs associated with the investigation or remediation of impacted sites, or subject to contribution claims by other responsible parties for their costs incurred at such sites. The Companies also may identify, evaluate and remediate other potentially impacted sites under voluntary state programs. Remediation costs may be subject to reimbursement under the Companies’ insurance policies, rate recovery mechanisms, or both. Except as described below, the Companies do not believe these matters will have a material effect on results of operations, financial condition and/or cash flows. Dominion Energy has determined that it is associated with former manufactured gas plant sites, including certain sites associated with Virginia Power. At 11 sites associated with Dominion Energy, including certain sites acquired in the SCANA Combination, remediation work has been substantially completed under federal or state oversight. Where required, the sites are following state-approved groundwater monitoring programs. Dominion Energy has proposed or expects to propose remediation plans associated with three sites, including one at Virginia Power, and expects to conduct remediation activities primarily in 2020. As of December 31, 2019, Dominion Energy and Virginia Power have $34 million and $16 million, respectively, of reserves recorded, including a charge of $16 million ($12 million after-tax) that Virginia Power recorded in 2018, in other operations and maintenance expense in the Consolidated Statements of Income. In addition, for one site associated with Dominion Energy, an updated work plan submitted to SCDHEC in September 2018, would increase costs by approximately $8 million if approved. Dominion Energy is associated with 13 additional sites, including two associated with Virginia Power, which are not under investigation by any state or federal environmental agency nor the subject of any current or proposed plans to perform remediation activities. Due to the uncertainty surrounding such sites, Dominion Energy and Virginia Power are unable to make an estimate of the potential financial statement impacts. Ash Pond and Landfill Closure Costs In April 2015, the EPA enacted a final rule regulating CCR landfills, existing ash ponds that still receive and manage CCRs, and inactive ash ponds that do not receive, but still store, CCRs. Dominion Energy currently operates inactive ash ponds, existing ash ponds and CCR landfills subject to the final rule at 11 different facilities, eight of which are at Virginia Power. This rule created a legal obligation for Dominion Energy and Virginia Power to retrofit or close all of its inactive and existing ash ponds over a certain period of time, as well as perform required monitoring, corrective action, and post-closure care activities as necessary. In December 2016, legislation was enacted that creates a framework for EPA- In April 2017, the Governor of Virginia signed legislation into law that placed a moratorium on the VDEQ issuing solid waste permits for closure of ash ponds at Virginia Power’s Bremo, Chesapeake, Chesterfield and Possum Point power stations until May 2018. The law also required Virginia Power to conduct an assessment of closure alternatives for the ash ponds at these four stations, to include an evaluation of excavation for recycling or off-site on-site, after-tax) In March 2019, the Governor of Virginia signed into law legislation which requires any CCR unit located at Virginia Power’s Bremo, Chesapeake, Chesterfield or Possum Point power stations that stop accepting CCR prior to July 2019 be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. The legislation further requires that at least 6.8 million cubic yards of CCR be beneficially reused. Costs associated with the closure of these CCR units are recoverable through a rate adjustment clause approved by the Virginia Commission with a revenue requirement that cannot exceed $225 million in any 12-month after-tax) Other Legal Matters The Companies are defendants in a number of lawsuits and claims involving unrelated incidents of property damage and personal injury. Due to the uncertainty surrounding these matters, the Companies are unable to make an estimate of the potential financial statement impacts; however, they could have a material impact on results of operations, financial condition and/or cash flows. SCANA Legal Proceedings The following describes certain legal proceedings involving Dominion Energy, SCANA or DESC relating to events occurring before closing of the SCANA Combination. Dominion Energy intends to vigorously contest the lawsuits, claims and assessments which have been filed or initiated against SCANA and DESC. No reference to, or disclosure of, any proceeding, item or matter described below shall be construed as an admission or indication that such proceeding, item or matter is material. For certain of these matters, and unless otherwise noted therein, Dominion Energy is unable to estimate a reasonable range of possible loss and the related financial statement impacts, but for any such matter there could be a material impact to its results of operations, financial condition and/or cash flows. For the matters for which Dominion Energy is able to reasonably estimate a probable loss, Dominion Energy’s Consolidated Balance Sheets include reserves of $696 million and insurance receivables of $111 million, included within other receivables at December 31, 2019. Dominion Energy’s Consolidated Statements of Income for the year ended December 31, 2019 includes charges of $641 million ($480 million after-tax Ratepayer Class Actions In May 2018, a consolidated complaint against DESC, SCANA and the State of South Carolina was filed in the State Court of Common Pleas in Hampton County, South Carolina (the DESC Ratepayer Case). In September 2018, the court certified this case as a class action. The plaintiffs allege, among other things, that DESC was negligent and unjustly enriched, breached alleged fiduciary and contractual duties and committed fraud and misrepresentation in failing to properly manage the NND Project, and that DESC committed unfair trade practices and violated state anti-trust laws. The plaintiffs sought a declaratory judgment that DESC may not charge its customers for any past or continuing costs of the NND Project, sought to have SCANA and DESC’s assets frozen and all monies recovered from Toshiba Corporation and other sources be placed in a constructive trust for the benefit of ratepayers and sought specific performance of the alleged implied contract to construct the NND Project. In December 2018, the State Court of Common Pleas in Hampton County entered an order granting preliminary approval of a class action settlement and a stay of pre-trial In September 2017, a purported class action was filed by Santee Cooper ratepayers against Santee Cooper, DESC, Palmetto Electric Cooperative, Inc. and Central Electric Power Cooperative, Inc. in the State Court of Common Pleas in Hampton County, South Carolina (the Santee Cooper Ratepayer Case). The allegations are substantially similar to those in the DESC Ratepayer Case. The plaintiffs seek a declaratory judgment that the defendants may not charge the purported class for reimbursement for past or future costs of the NND Project. In March 2018, the plaintiffs filed an amended complaint including as additional named defendants, including certain then current and former directors of Santee Cooper and SCANA. In June 2018, Santee Cooper filed a Notice of Petition for Original Jurisdiction with the Supreme Court of South Carolina. In December 2018, Santee Cooper filed its answer to the plaintiffs’ fourth amended complaint and filed cross claims against DESC, which was denied. In October 2019, Santee Cooper voluntarily consented to stay its cross claims against DESC pending the outcome of the trial of the underlying case. In November 2019, DESC removed the case to the U.S. District Court for the District of South Carolina. In December 2019, the plaintiffs and Santee Cooper filed a motion to remand the case to state court. In January 2020, the case was remanded to state court. In February 2020, the parties executed a preliminary settlement term sheet relating to this matter as well as the Luquire Case and the Glibowski Case described below. The proposed settlement is expected to be $520 million, of which Dominion Energy’s portion is $320 million. The parties are currently negotiating a settlement agreement based on the preliminary settlement term sheet that will be presented to the court for preliminary approval. This case is pending. In July 2019, a similar purported class action was filed by certain Santee Cooper ratepayers against DESC, SCANA, Dominion Energy and former directors and officers of SCANA in the State Court of Common Pleas in Orangeburg, South Carolina (the Luquire Case). In August 2019, DESC, SCANA and Dominion Energy were voluntarily dismissed from the case. The claims are similar to the Santee Cooper Ratepayer Case. In February 2020, the parties executed a preliminary settlement term sheet as described above relating to this matter as well as the Santee Cooper Ratepayer Case and the Glibowski Case. This case is pending. RICO Class Action In January 2018, a purported class action was filed, and subsequently amended, against SCANA, DESC and certain former executive officers in the U.S. District Court for the District of South Carolina (the Glibowski Case). The plaintiff alleges, among other things, that SCANA, DESC and the individual defendants participated in an unlawful racketeering enterprise in violation of RICO and conspired to violate RICO by fraudulently inflating utility bills to generate unlawful proceeds. The DESC Ratepayer Class Action settlement described previously contemplates dismissal of claims by DESC ratepayers in this case against DESC, SCANA and their officers. In August 2019, the individual defendants filed motions to dismiss. In February 2020, the parties executed a preliminary settlement term sheet as described above relating to this matter as well as the Santee Cooper Ratepayer Case and the Luquire Case. This case is pending. SCANA Shareholder Litigation In September 2017, a purported class action was filed against SCANA and certain former executive officers and directors in the U.S. District Court for the District of South Carolina. Subsequent additional purported class actions were separately filed against all or nearly all of these defendants. In January 2018, the U.S. District Court for the District of South Carolina consolidated these suits, and the plaintiffs filed a consolidated amended complaint in March 2018. The plaintiffs allege, among other things, that the defendants violated §10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 the defendants’ motions to dismiss. In December 2019, the parties executed a settlement agreement pursuant to which SCANA will pay $192.5 million, up to $32.5 million of which can be satisfied through the issuance of shares of Dominion Energy common stock, subject to approval by the U.S. District Court for the District of South Carolina. In February 2020, the U.S. District Court for the District of South Carolina granted preliminary approval of the settlement agreement, pending a fairness hearing. In September 2017, a shareholder derivative action was filed against certain former executive officers and directors of SCANA in the State Court of Common Pleas in Richland County, South Carolina. In September 2018, this action was consolidated with another action in the Business Court Pilot Program in Richland County. The plaintiffs allege, among other things, that the defendants breached their fiduciary duties to shareholders by their gross mismanagement of the NND Project, and that the defendants were unjustly enriched by bonuses they were paid in connection with the project. The defendants have filed a motion to dismiss the consolidated action. In February 2019, one action was voluntarily dismissed. This case is pending. In January 2018, a purported class action was filed against SCANA, Dominion Energy and certain former executive officers and directors of SCANA in the State Court of Common Pleas in Lexington County, South Carolina (the City of Warren Lawsuit). The plaintiff alleges, among other things, that defendants violated their fiduciary duties to shareholders by executing a merger agreement that would unfairly deprive plaintiffs of the true value of their SCANA stock, and that Dominion Energy aided and abetted these actions. Among other remedies, the plaintiff seeks to enjoin and/or rescind the merger. In February 2018, Dominion Energy removed the case to the U.S. District Court for the District of South Carolina, and filed a Motion to Dismiss in March 2018. In June 2018, the case was remanded back to the State Court of Common Pleas in Lexington County. Dominion Energy appealed the decision to remand to the U.S. Court of Appeals for the Fourth Circuit, where the appeal was consolidated with a similar appeal in the Metzler Lawsuit discussed below. In June 2019, the U.S. Court of Appeals for the Fourth Circuit reversed the order remanding the case to state court. The case is pending in the U.S. District Court for the District of South Carolina. In February 2018, a purported class action was filed against Dominion Energy and certain former directors of SCANA and DESC in the State Court of Common Pleas in Richland County, South Carolina (the Metzler Lawsuit). The allegations made and the relief sought by the plaintiffs are substantially similar to that described for the City of Warren Lawsuit. In February 2018, Dominion Energy removed the case to the U.S. District Court for the District of South Carolina, and filed a Motion to Dismiss in March 2018. In August 2018, the case was remanded back to the State Court of Common Pleas in Richland County. Dominion Energy appealed the decision to remand to the U.S. Court of Appeals for the Fourth Circuit, where the appeal was consolidated with the City of Warren Lawsuit. In June 2019, the U.S. Court of Appeals for the Fourth Circuit reversed the order remanding the case to state court. The case is pending in the U.S. District Court for the District of South Carolina. In September 2019, the U.S. District Court for the District of South Carolina granted the plaintiffs’ motion to consolidate the City of Warren Lawsuit and the Metzler Lawsuit. In October 2019, the plaintiffs filed an amended complaint against certain former directors and executive officers of SCANA and DESC, which stated substantially similar allegations to those in the City of Warren Lawsuit and the Metzler Lawsuit. In November 2019, the defendants filed a motion to dismiss. This case is pending. In May 2019, a case was filed against certain former executive officers and directors of SCANA in the State Court of Common Pleas in Richland County, South Carolina. The plaintiffs allege, among other things, that the defendants breached their fiduciary duties to shareholders by their gross mismanagement of the NND Project, were unjustly enriched by the bonuses they were paid in connection with the project and breached their fiduciary duties to non-South Employment Class Actions and Indemnification In August 2017, a case was filed in the U.S. District Court for the District of South Carolina on behalf of persons who were formerly employed at the NND Project. In July 2018, the court certified this case as a class action. In February 2019, certain of these plaintiffs filed an additional case, which case has been dismissed and the plaintiffs have joined the case filed August 2017. The plaintiffs allege, among other things, that SCANA, DESC, Fluor Corporation and Fluor Enterprises, Inc. violated the Worker Adjustment and Retraining Notification Act in connection with the decision to stop construction at the NND Project. The plaintiffs allege that the defendants failed to provide adequate advance written notice of their terminations of employment and are seeking damages, which could be as much as $100 million for 100% of the NND Project. In September 2018, a case was filed in the State Court of Common Pleas in Fairfield County, South Carolina by Fluor Enterprises, Inc. and Fluor Daniel Maintenance Services, Inc. against DESC and Santee Cooper. The plaintiffs make claims for indemnification, breach of contract and promissory estoppel arising from, among other things, the defendants’ alleged failure and refusal to defend and indemnify the Fluor defendants in the aforementioned case. These cases are pending. FILOT Litigation and Related Matters In November 2017, Fairfield County filed a complaint and a motion for temporary injunction against DESC in the State Court of Common Pleas in Fairfield County, South Carolina, making allegations of breach of contract, fraud, negligent misrepresentation, breach of fiduciary duty, breach of implied duty of good faith and fair dealing and unfair trade practices related to DESC’s termination of the FILOT agreement between DESC and Fairfield County related to the NND Project. The plaintiff sought a temporary and permanent injunction to prevent DESC from terminating the FILOT agreement. The plaintiff withdrew the motion for temporary injunction in December 2017. This case is pending. Governmental Proceedings and Investigations In June 2018, DESC received a notice of proposed assessment of approximately $410 million, excluding interest, from the SCDOR following its audit of DESC’s sales and use tax returns for the periods September 1, 2008 through December 31, 2017. The proposed assessment, which includes 100% of the NND Project, is based on the SCDOR’s position that DESC’s sales and use tax exemption for the NND Project does not apply because the facility will not become operational. DESC has protested the proposed assessment, which remains pending. In September and October 2017, SCANA was served with subpoenas issued by the U.S. Attorney’s Office for the District of South Carolina and the Staff of the SEC’s Division of Enforcement seeking documents related to the NND Project. In February 2020, the SEC filed a complaint against SCANA, two of its former executive officers and DESC in the U.S. District Court for the District of South Carolina alleging that the defendants violated federal securities laws by making false and misleading statements about the NND Project. In addition, the South Carolina Law Enforcement Division is conducting a criminal investigation into the handling of the NND Project by SCANA and DESC. These matters are pending. SCANA and DESC are cooperating fully with the investigations, including responding to additional subpoenas and document requests; however, Dominion Energy cannot currently predict whether or to what extent SCANA or DESC may incur a material liability. Other Litigation In December 2018, arbitration proceedings commenced between DESC and Cameco Corporation related to a supply agreement signed in May 2008. This agreement provides the terms and conditions under which DESC agreed to purchase uranium hexafluoride from Cameco Corporation over a period from 2010 to 2020. Cameco Corporation alleges that DESC violated this agreement by failing to purchase the stated quantities of uranium hexafluoride for the 2017 and 2018 delivery years. DESC denies that it is in breach of the agreement and believes that it has reduced its purchase quantity within the terms of the agreement. This matter is pending. Abandoned NND Project DESC, for itself and as agent for Santee Cooper, entered into an engineering, construction and procurement contract with Westinghouse and WECTEC in 2008 for the design and construction of the NND Project, of which DESC’s ownership share is 55%. Various difficulties were encountered in connection with the project. The ability of Westinghouse and WECTEC to adhere to established budgets and construction schedules was affected by many variables, including unanticipated difficulties encountered in connection with project engineering and the construction of project components, constrained financial resources of the contractors, regulatory, legal, training and construction processes associated with securing approvals, permits and licenses and necessary amendments to them within projected time frames, the availability of labor and materials at estimated costs and the efficiency of project labor. There were also contractor and supplier performance issues, difficulties in timely meeting critical regulatory requirements, contract disputes, and changes in key contractors or subcontractors. These matters preceded the filing for bankruptcy protection by Westinghouse and WECTEC in March 2017, and were the subject of comprehensive analyses performed by SCANA and Santee Cooper. Based on the results of SCANA’s analysis, and in light of Santee Cooper’s decision to suspend construction on the NND Project, in July 2017, SCANA determined to stop the construction of the units and to pursue recovery of costs incurred in connection with the construction under the abandonment provisions of the Base Load Review Act or through other means. This decision by SCANA became the focus of numerous legislative, regulatory and legal proceedings. Some of these proceedings remain unresolved and are described above. In September 2017, DESC, for itself and as agent for Santee Cooper, filed with the U.S. Bankruptcy Court for the Southern District of New York Proofs of Claim for unliquidated damages against each of Westinghouse and WECTEC. These Proofs of Claim were based upon the anticipatory repudiation and material breach by Westinghouse and WECTEC of the contract, and assert against Westinghouse and WECTEC any and all claims that are based there

Credit Risk

Credit Risk	12 Months Ended
	Dec. 31, 2019
Risks and Uncertainties [Abstract]
Credit Risk	Note 24. Credit Risk Dominion Energy As a diversified energy company, Dominion Energy transacts primarily with major companies in the energy industry and with commercial and residential energy consumers. These transactions principally occur in the Northeast, mid-Atlantic, Dominion Energy’s exposure to credit risk is concentrated primarily within its energy marketing and price risk management activities, as Dominion Energy transacts with a smaller, less diverse group of counterparties and transactions may involve large notional volumes and potentially volatile commodity prices. Energy marketing and price risk management activities include marketing of merchant generation output, structured transactions and the use of financial contracts for enterprise-wide hedging purposes. Gross credit exposure for each counterparty is calculated as outstanding receivables plus any unrealized on- off-balance non-investment Virginia Power Virginia Power sells electricity and provides distribution and transmission services to customers in Virginia and northeastern North Carolina. Management believes that this geographic concentration risk is mitigated by the diversity of Virginia Power’s customer base, which includes residential, commercial and industrial customers, as well as rural electric cooperatives and municipalities. Credit risk associated with trade accounts receivable from energy consumers is limited due to the large number of customers. Virginia Power’s exposure to potential concentrations of credit risk results primarily from sales to wholesale customers. Virginia Power’s gross credit exposure for each counterparty is calculated as outstanding receivables plus any unrealized on- off-balance Dominion Energy Gas Dominion Energy Gas transacts mainly with major companies in the energy industry. These transactions principally occur in the eastern and Rocky Mountain regions of the U.S. Dominion Energy Gas does not believe that this geographic concentration contributes to its overall exposure to credit risk. In addition, as a result of its large and diverse customer base, Dominion Energy Gas is not exposed to a significant concentration of credit risk for receivables arising from its regulated operations. Dominion Energy Gas’ gross credit exposure for each counterparty is calculated as outstanding receivables plus any unrealized on- off-balance non-investment Upon the Liquefaction Facility commencing commercial operations in April 2018, the majority of Cove Point’s revenue and earnings are expected to be generated from annual reservation payments under certain terminalling, storage and transportation contracts with the Export Customers. If such agreements were terminated and Cove Point was unable to replace such agreements on comparable terms, there could be a material impact on results of operations, financial condition and/or cash flows. The Export Customers comprised approximately 34% and 32% of Dominion Energy Gas’ operating revenues for the years ended December 31, 2019 and 2018, respectively, with Dominion Energy Gas’ largest customer representing approximately 17% and 12% of such amounts. In 2019, DETI provided service to 296 customers with approximately 98% of its storage and transportation revenue being provided through firm services. The ten largest customers provided approximately 38% of the total storage and transportation revenue and the thirty largest provided approximately 72% of the total storage and transportation revenue. Credit-Related Contingent Provisions The majority of Dominion Energy’s derivative instruments contain credit-related contingent provisions. These provisions require Dominion Energy to provide collateral upon the occurrence of specific events, primarily a credit rating downgrade. If the credit-related contingent features underlying these instruments that are in a liability position and not fully collateralized with cash were fully triggered as of December 31, 2019 and 2018, Dominion Energy would have been required to post an additional $10 million and $1 million, respectively, of collateral to its counterparties. The collateral that would be required to be posted includes the impacts of any offsetting asset positions and any amounts already posted for derivatives, non-derivative If the credit-related contingent features underlying these instruments that are in a liability position and not fully collateralized with cash were fully triggered as of December 31, 2019, Virginia Power would have been required to post an additional $8 million of collateral to its counterparties. Credit-related contingent provisions for Virginia Power were not material as of December 31, 2018. Credit-related contingent provisions for Dominion Energy Gas were not material as of December 31, 2019 and 2018. See Note 7 for further information about derivative instruments.

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	Note 25. Related-party Transactions Virginia Power and Dominion Energy Gas engage in related party transactions primarily with other Dominion Energy subsidiaries (affiliates). Virginia Power and Dominion Energy Gas’ receivable and payable balances with affiliates are settled based on contractual terms or on a monthly basis, depending on the nature of the underlying transactions. Virginia Power and Dominion Energy Gas are included in Dominion Energy’s consolidated federal income tax return and, where applicable, combined income tax returns for Dominion Energy are filed in various states. See Note 2 for further information. Dominion Energy’s transactions with equity method investments are described in Note 9. A discussion of significant related party transactions follows. Virginia Power Transactions with Affiliates Virginia Power transacts with affiliates for certain quantities of natural gas and other commodities in the ordinary course of business. Virginia Power also enters into certain commodity derivative contracts with affiliates. Virginia Power uses these contracts, which are principally comprised of forward commodity purchases, to manage commodity price risks associated with purchases of natural gas. See Notes 7 and 19 for more information. As of December 31, 2019, Virginia Power’s derivative assets and liabilities with affiliates were $3 million and $53 million, respectively. As of December 31, 2018, Virginia Power’s derivative assets and liabilities with affiliates were $26 million and $10 million, respectively. Virginia Power participates in certain Dominion Energy benefit plans as described in Note 22. At December 31, 2019 and 2018, Virginia Power’s amounts due to Dominion Energy associated with the Dominion Energy Pension Plan and reflected in noncurrent pension and other postretirement benefit liabilities in the Consolidated Balance Sheets were $782 million and $632 million, respectively. At December 31, 2019 and 2018, Virginia Power’s amounts due from Dominion Energy associated with the Dominion Energy Retiree Health and Welfare Plan and reflected in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $287 million and $254 million, respectively. DES and other affiliates provide accounting, legal, finance and certain administrative and technical services to Virginia Power. In addition, Virginia Power provides certain services to affiliates, including charges for facilities and equipment usage. The financial statements for all years presented include costs for certain general, administrative and corporate expenses assigned by DES to Virginia Power on the basis of direct and allocated methods in accordance with Virginia Power’s services agreements with DES. Where costs incurred cannot be determined by specific identification, the costs are allocated based on the proportional level of effort devoted by DES resources that is attributable to the entity, determined by reference to number of employees, salaries and wages and other similar measures for the relevant DES service. Management believes the assumptions and methodologies underlying the allocation of general corporate overhead expenses are reasonable. Presented below are significant transactions with DES and other affiliates: Year Ended December 31, 2019 2018 2017 (millions) Commodity purchases from affiliates $ 690 $ 930 $ 674 Services provided by affiliates (1) 503 450 453 Services provided to affiliates 24 24 25 (1) Includes capitalized expenditures of $133 million, $145 million and $144 million for the year ended December 31, 2019, 2018 and 2017, respectively. Virginia Power has borrowed funds from Dominion Energy under short-term borrowing arrangements. There were $107 million and $224 million in short-term demand note borrowings from Dominion Energy as of December 31, 2019 and 2018, respectively. The weighted-average interest rate of these borrowings was 3.22% and 2.94% at December 31, 2019 and 2018, respectively. Virginia Power had no outstanding borrowings, net of repayments under the Dominion Energy money pool for its nonregulated subsidiaries as of December 31, 2019 and 2018. Interest charges related to Virginia Power’s borrowings from Dominion Energy were immaterial for the years ended December 31, 2019, 2018 and 2017. There were no issuances of Virginia Power’s common stock to Dominion Energy in 2019, 2018 or 2017. Dominion Energy Gas Transactions with Related Parties Dominion Energy Gas transacts with affiliates for certain quantities of natural gas and other commodities at market prices in the ordinary course of business. Additionally, Dominion Energy Gas provides transportation and storage services to affiliates. Dominion Energy Gas also enters into certain other contracts with affiliates, and related parties, including construction services, which are presented separately from contracts involving commodities or services. As of December 31, 2019 and 2018, Dominion Energy Gas did not have any commodity derivative assets and liabilities. See Notes 7 and 20 for more information. See Note 9 for information regarding transactions with an affiliate. See Note 3 for information regarding the Dominion Energy Gas Restructuring, an affiliated transaction. Dominion Energy Gas participates in certain Dominion Energy benefit plans as described in Note 22. At December 31, 2019 and 2018, Dominion Energy Gas’ amounts due from Dominion Energy associated with the Dominion Energy Pension Plan and reflected in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $326 million and $319 million, respectively. Dominion Energy Gas’ amounts due from Dominion Energy associated with the Dominion Energy Retiree Health and Welfare Plan and reflected in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $17 million and $13 million at December 31, 2019 and 2018, respectively. DES, DECGS, DEQPS and other affiliates provide accounting, legal, finance and certain administrative and technical services to Dominion Energy Gas. Dominion Energy Gas provides certain services to related parties, including technical services. The financial statements for all years presented include costs for certain general, administrative and corporate expenses assigned by DES, DECGS and DEQPS to Dominion Energy Gas on the basis of direct and allocated methods in accordance with Dominion Energy Gas’ services agreements with DES, DECGS and DEQPS. Where costs incurred cannot be determined by specific identification, the costs are allocated based on the proportional level of effort devoted by DES, DECGS and DEQPS resources that is attributable to the entity, determined by reference to number of employees, salaries and wages and other similar measures for the relevant DES service. Management believes the assumptions and methodologies underlying the allocation of general corporate overhead expenses are reasonable. The costs of these services follow: Year Ended December 31, 2019 2018 2017 (millions) Sales of natural gas and transportation and storage services $ 249 $ 168 $ 173 Purchases of natural gas and transportation and storage services 12 — 10 Services provided by related parties (1) 226 169 193 Services provided to related parties (2) 164 260 190 (1) Includes capitalized expenditures of $19 million, $37 million and $53 million for the year ended December 31, 2019, 2018 and 2017, respectively. (2) Amounts primarily attributable to Atlantic Coast Pipeline, a related party VIE. The following table presents affiliated and related party balances reflected in Dominion Energy Gas’ Consolidated Balance Sheets: At December 31, 2019 2018 (millions) Other receivables (1) $ 7 $ 13 Imbalances receivable from affiliates 8 16 Imbalances payable from affiliates (2) 1 4 Other deferred charges and other assets 12 — (1) Represents amounts due from Atlantic Coast Pipeline, a related party VIE. (2) Amounts are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. Affiliated receivables at December 31, 2019 and December 31, 2018 included $22 million and $7 million of accrued unbilled revenue, respectively. This revenue is based on estimated amounts of services provided but not yet billed to various affiliates. Affiliated notes receivable from East Ohio and DGP borrowings under an IRCA with Dominion Energy Gas were $704 million at December 31, 2018. Interest income on the IRCAs was $14 million, $15 million and $5 million for the years ended December 31, 2019, 2018 and 2017, respectively. In 2016, DMLPHCII issued a five-year $15.0 million promissory note to Dominion Energy. The interest rate is a fixed 2.75% per annum. Interest income earned on the promissory note was immaterial for the years ended December 31, 2019, 2018 and 2017. In 2018, in connection with the closing of a $3.0 billion term loan, Cove Point loaned Dominion Energy $3.0 billion in exchange for a promissory note. The promissory note had an annual interest rate of 3.6% which was payable quarterly and was scheduled to mature in 2021. Interest income related to Dominion Energy’s borrowing was $82 million and $21 million for the years ended December 31, 2019 and December 31, 2018, respectively, presented in other income in the Consolidated Statements of Income and accrued interest was immaterial at December 31, 2018, presented in affiliated receivables in the Consolidated Balance Sheets. In September 2019, Dominion Energy repaid the promissory note to Cove Point and the proceeds were used by Cove Point to repay its $3.0 billion term loan. In November 2019, Dominion Energy Gas issued a five-year promissory note to Dominion Energy under which it may lend up to $3.0 billion. Dominion Energy Gas’ affiliated notes receivable from Dominion Energy totaled $1.8 billion at December 31, 2019. The promissory note has a fixed annual interest rate of 2.5% payable quarterly . Interest income on the promissory note was $5 million for the year ended December 31, 2019. At December 31, 2019 and 2018, Dominion Energy Gas’ affiliated notes receivable from East Ohio totaled $1.7 billion and $1.4 billion, respectively. These promissory notes have fixed annual interest rates between 3.67% to 4.90% which are payable semi-annually. Interest income on these promissory notes was $72 million for the year ended December 31, 2019 and $64 million for both the years ended December 31, 2018 and 2017. Dominion Energy Gas’ borrowings under the IRCA with Dominion Energy totaled $251 million and $218 million as of December 31, 2019 and 2018, respectively. The weighted-average interest rate of these borrowings was 2.02% and 2.78% at December 31, 2019 and 2018, respectively. Interest charges related to Dominion Energy Gas’ total borrowings from Dominion Energy were $3 million for December 31, 2019 and less than $1 million for December 31, 2018 and 2017, respectively. DCP had borrowings under an IRCA with Dominion Energy of $2.8 billion at December 31, 2018. The weighted-average interest rate for these borrowings was 3.43% at December 31, 2018. In October 2019, DCP repaid the outstanding balance and accrued interest utilizing funds from a capital contribution from Dominion Energy. Interest charges related to DCP’s total borrowings from Dominion Energy totaled $94 million, $96 million and $82 million for the years ended December 31, 2019, 2018 and 2017, respectively. In addition, DCP had borrowings of $9 million and $57 million with DES as of December 31, 2019 and 2018 respectively. The weighted-average interest rate for these borrowings was 3.85% and 3.45% at December 31, 2019 and 2018, respectively. Interest related to DCP’s total borrowings from DES totaled $3 million, $1 million and less than $1 million for the years ended December 31, 2019, 2018 and 2017, respectively. DMLPHCII had borrowings under an IRCA with Dominion Energy of $22 million December 31, 2018. The weighted-average interest rate for these borrowings was 3.43% at December 31, 2018. In October 2019, DMLPHCII repaid the outstanding balance and accrued interest utilizing funds from a capital contribution from Dominion Energy. Interest charges related to DMLPHCII’s total borrowings from Dominion Energy were less than $1 million for each of the years ended December 31, 2019, 2018 and 2017. In the first quarter of 2019, Dominion Energy Midstream borrowed $395 million from Dominion Energy under a $400 million promissory note with Dominion Energy that was scheduled to mature in 2022. The interest rate was fixed 3.5% per annum. In October 2019, Dominion Energy Midstream repaid the outstanding balance and accrued interest utilizing funds from a capital contribution from Dominion Energy. Interest charges of $10 million were incurred for the year ended December 31, 2019. For the periods ending December 31, 2019, 2018 and 2017, Dominion Energy Gas, including entities acquired in the Dominion Energy Gas Restructuring, distributed $603 million, $230 million and $239 million to Dominion Energy, respectively.

Operating Segments

Operating Segments	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Operating Segments	Note 26. Operating Segments The Companies are organized primarily on the basis of products and services sold in the U.S. A description of the operations included in the Companies’ primary operating segments is as follows: Primary Operating Description of Operations Dominion Virginia Dominion Dominion Energy Virginia Regulated electric distribution X X Regulated electric transmission X X Regulated electric generation fleet (1) X X Gas Transmission & Storage Regulated gas transmission and storage (2) X X LNG terminalling and storage X X Nonregulated retail energy marketing X Gas Distribution Regulated gas distribution and storage (3) X Dominion Energy South Carolina Regulated electric distribution X Regulated electric transmission X Regulated electric generation fleet X Regulated gas distribution and storage X Contracted Generation Merchant electric generation fleet X (1) Includes Virginia Power’s nonjurisdictional generation operations. (2) Includes gathering and processing activities. (3) Includes Wexpro’s natural gas development and production operations. In addition to the operating segments above, the Companies also report a Corporate and Other segment. Dominion Energy The Corporate and Other Segment of Dominion Energy In 2019, Dominion Energy reported after-tax The net expenses for specific items in 2019 primarily related to the impact of the following items: • A $1.0 billion ($756 million after-tax) • $641 million ($480 million after-tax) • $484 million ($315 million after-tax) after-tax) • Dominion Energy Virginia ($151 million after-tax); • Gas Distribution ($56 million after-tax); • Dominion Energy South Carolina ($75 million after-tax); • Contracted Generation ($38 million after-tax); • Gas Transmission & Storage ($5 million after-tax • A $346 million ($257 million after-tax) • A $194 million tax charge for $258 million of income tax-related • A $160 million ($119 million after-tax) • A $135 million ($100 million after-tax) non-utility • A $114 million ($86 million after-tax) • A $553 million ($411 million after-tax) • Dominion Energy Virginia ($49 million after-tax); • Contracted Generation ($362 million after-tax); • A $113 million ($84 million after-tax) In 2018, Dominion Energy reported after-tax The net expenses for specific items in 2018 primarily related to the impact of the following items: • A $219 million ($164 million after-tax) • A $215 million ($160 million after-tax) one-time • A $170 million ($134 million after-tax) • Dominion Energy Virginia ($14 million after-tax); • Contracted Generation ($120 million after-tax); • A $124 million ($88 million after-tax) • An $81 million ($60 million after-tax) • A $70 million ($52 million after-tax) • An $828 million ($619 million after-tax) • Contracted Generation ($229 million after-tax); • Gas Transmission & Storage ($390 million after-tax). In 2017, Dominion Energy reported after-tax The net benefits for specific items in 2017 primarily related to the impact of the following items: • A $1.0 billion tax benefit resulting from the remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act, primarily attributable to: • Dominion Energy Virginia ($83 million); • Gas Transmission & Storage ($302 million); • Gas Distribution ($56 million); • Contracted Generation ($569 million); partially offset by • $158 million ($96 million after-tax) The following table presents segment information pertaining to Dominion Energy’s operations: Year Ended December 31, Dominion Gas Gas Dominion Contracted Corporate and Other Adjustments & Eliminations Consolidated Total (millions) 2019 Total revenue from external customers $8,170 $3,074 $2,367 $2,948 $1,135 $(1,122 ) $ — $16,572 Intersegment revenue (13 ) 247 18 4 15 1,199 (1,470 ) — Total operating revenue 8,157 3,321 2,385 2,952 1,150 77 (1,470 ) 16,572 Depreciation, depletion and amortization 1,216 400 335 452 179 73 — 2,655 Equity in earnings of equity method investees — 161 2 (4 ) (1 ) 10 — 168 Interest income 11 211 4 9 92 160 (386 ) 101 Interest and related charges 530 405 116 242 98 768 (386 ) 1,773 Income tax expense (benefit) 482 262 114 163 20 (690 ) — 351 Net income (loss) attributable to Dominion Energy 1,786 934 488 430 276 (2,556 ) — 1,358 Investment in equity method investees — 1,517 32 — 74 23 — 1,646 Capital expenditures 3,002 431 848 562 367 111 — 5,321 Total assets (billions) 43.7 20.9 16.0 15.8 10.2 6.9 (9.7 ) 103.8 2018 Total revenue from external customers $8,401 $1,867 $1,769 $ — $1,487 $ (249 ) $ 91 $13,366 Intersegment revenue (552 ) 723 16 — 8 723 (918 ) — Total operating revenue 7,849 2,590 1,785 — 1,495 474 (827 ) 13,366 Depreciation, depletion and amortization 1,158 348 263 — 213 18 — 2,000 Equity in earnings of equity method investees — 178 — — 18 1 — 197 Interest income 10 143 — — 80 122 (271 ) 84 Interest and related charges 516 262 79 — 124 784 (272 ) 1,493 Income tax expense (benefit) 380 236 95 — 75 (206 ) — 580 Net income (loss) attributable to Dominion Energy 1,596 844 373 — 245 (611 ) — 2,447 Investment in equity method investees — 1,159 — — 82 37 — 1,278 Capital expenditures 2,640 765 647 — 247 106 — 4,405 Total assets (billions) 39.1 22.6 11.8 — 9.0 8.3 (12.9 ) 77.9 2017 Total revenue from external customers $8,254 $1,054 $1,778 $ — $1,345 $ (27 ) $ 182 $12,586 Intersegment revenue (688 ) 946 17 — 9 724 (1,008 ) — Total operating revenue 7,566 2,000 1,795 — 1,354 697 (826 ) 12,586 Depreciation, depletion and amortization 1,141 260 258 — 200 46 — 1,905 Equity in earnings of equity method investees — 158 — — (171 ) (5 ) — (18 ) Interest income 19 114 — — 77 94 (222 ) 82 Interest and related charges 497 100 72 — 110 648 (222 ) 1,205 Income tax expense (benefit) 865 291 195 — (160 ) (1,221 ) — (30 ) Net income (loss) attributable to Dominion Energy 1,466 552 351 — 253 377 — 2,999 Capital expenditures 2,726 1,489 452 — 979 263 — 5,909 Intersegment sales and transfers for Dominion Energy are based on contractual arrangements and may result in intersegment profit or loss that is eliminated in consolidation. Virginia Power The Corporate and Other Segment of Virginia Power In 2019, Virginia Power reported after-tax The net expenses for specific items in 2019 primarily related to the impact of the following items: • A $346 million ($257 million after-tax) • A $198 million ($146 million after-tax) • A $160 million ($119 million after-tax) • A $135 million ($100 million after-tax) non-utility • A $62 million ($46 million after-tax) • A $113 million ($84 million after-tax) In 2018, Virginia Power reported after-tax ere The net expenses for specific items in 2018 primarily related to the impact of the following items: • A $215 million ($160 million after-tax) one-time • An $81 million ($60 million after-tax) • A $70 million ($52 million after-tax) In 2017, Virginia Power reported an after-tax The net benefit for specific items in 2017 primarily related to the impact of the following item: • A $93 million tax benefit resulting from the remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act. The following table presents segment information pertaining to Virginia Power’s operations: Year Ended December 31, Dominion Energy Virginia Corporate Consolidated Total (millions) 2019 Operating revenue $8,137 $ (29 ) $8,108 Depreciation and amortization 1,215 8 1,223 Interest income 11 — 11 Interest expense (benefit) and related charges 529 (5 ) 524 Income tax expense (benefit) 481 (217 ) 264 Net income (loss) 1,783 (634 ) 1,149 Capital expenditures 2,981 — 2,981 Total assets (billions) 41.4 — 41.4 2018 Operating revenue $7,835 $(216 ) $7,619 Depreciation and amortization 1,157 (25 ) 1,132 Interest income (expense) 10 — 10 Interest expense (benefit) and related charges 516 (5 ) 511 Income tax expense (benefit) 378 (78 ) 300 Net income (loss) 1,594 (312 ) 1,282 Capital expenditures 2,542 — 2,542 Total assets (billions) 37.0 (0.1 ) 36.9 2017 Operating revenue $7,556 $ — $7,556 Depreciation and amortization 1,141 — 1,141 Interest income (expense) 19 — 19 Interest expense (benefit) and related charges 497 (3 ) 494 Income tax expense (benefit) 868 (94 ) 774 Net income 1,466 74 1,540 Capital expenditures 2,729 — 2,729 Dominion Energy Gas The Corporate and Other Segment of Dominion Energy Gas In 2019, Dominion Energy Gas reported an after-tax expense The net expense for specific items in 2019 primarily related to the impact of the following items: • A $48 million tax benefit resulting from changes in tax status of certain subsidiaries in connection with the Dominion Energy Gas Restructuring ; and • A $42 million ($31 million after-tax) In 2018, Dominion Energy Gas reported after-tax The net expense for specific items in 2018 primarily related to a $124 million ($88 million after-tax) In 2017, Dominion Energy Gas reported an after-tax benefit The net benefit for specific items in 2017 primarily related to a $169 million tax benefit resulting from the remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act. The following table presents segment information pertaining to Dominion Energy Gas’ operations: Year Ended December 31, Gas Corporate and Other Consolidated Total (millions) 2019 Operating revenue $2,186 $ (17 ) $2,169 Depreciation and amortization 367 — 367 Equity in earnings of equity method investees 43 — 43 Interest income 105 — 105 Interest and related charges 309 2 311 Income tax expense (benefit) 170 (69 ) 101 Net Income from discontinued operations — 141 141 Net Income attributable to Dominion Energy Gas 594 127 721 Investment in equity method investees 312 — 312 Capital expenditures 391 313 704 Total assets (billions) 18.8 — 18.8 2018 Operating revenue $1,996 $ — $1,996 Depreciation and amortization 333 — 333 Equity in earnings of equity method investees 54 — 54 Interest income 26 — 26 Interest and related charges 173 1 174 Income tax expense (benefit) 226 (102 ) 124 Net Income from discontinued operations — 24 24 Net Income (loss) attributable to Dominion Energy Gas 571 (90 ) 481 Investment in equity method investees 339 — 339 Capital expenditures 749 360 1,109 Total assets (billions) 19.9 6.9 26.8 2017 Operating revenue $1,523 $ — $1,523 Depreciation and amortization 242 — 242 Equity in earnings of equity method investees 47 — 47 Interest income 4 — 4 Interest and related charges 60 — 60 Income tax expense (benefit) 189 (254 ) (65 ) Net Income from discontinued operations — 163 163 Net Income attributable to Dominion Energy Gas 314 389 703 Capital expenditures 1,459 356 1,815

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	N ote 27. Quarterly Financial Data (Unaudited) A summary of the Companies’ quarterly results of operations for the years ended December 31, 2019 and 2018 follows. Amounts reflect all adjustments necessary in the opinion of management for a fair statement of the results for the interim periods. Results for interim periods may fluctuate as a result of weather conditions, changes in rates and other factors. Dominion Energy First Second Third Fourth (millions) 2019 Operating revenue $ 3,858 $ 3,970 $ 4,269 $ 4,475 Income (loss) from operations (482 ) 461 1,314 1,221 Net income (loss) including noncontrolling interests (677 ) 58 985 1,010 Net income (loss) attributable to Dominion Energy (680 ) 54 975 1,009 Basic EPS: Net income (loss) attributable to Dominion Energy (0.86 ) 0.07 1.19 1.22 Diluted EPS: Net income (loss) attributable to Dominion Energy (0.86 ) 0.05 1.17 1.21 Dividends per share (Series A Preferred Stock) — 0.729 4.375 4.375 Dividends per share (Series B Preferred Stock) — — — 1.9375 Dividends declared per common share 0.9175 0.9175 0.9175 0.9175 2018 Operating revenue $ 3,466 $ 3,088 $ 3,451 $ 3,361 Income from operations 875 742 1,150 834 Net income including noncontrolling interests 526 478 883 662 Net income attributable to Dominion Energy 503 449 854 641 Basic EPS: Net income attributable to Dominion Energy 0.77 0.69 1.31 0.97 Diluted EPS: Net income attributable to Dominion Energy 0.77 0.69 1.30 0.97 Dividends declared per common share 0.835 0.835 0.835 0.835 Dominion Energy’s 2019 results include the impact of the following significant items: • Fourth quarter results include a $244 million after-tax charge related to litigation acquired in the SCANA Combination, offset by a $150 million net gain related to nuclear decommissioning trust funds. • Second quarter results include a $316 million after-tax charge related to a voluntary retirement program, a $100 million after-tax charge related to a contract termination with a non-utility generator and a $75 million after-tax charge for litigation acquired in the SCANA Combination. • First quarter results include $1.3 billion of after-tax merger and integration-related costs related to the SCANA Combination (inclusive of a $756 million after-tax charge for refunds of amounts previously collected from retail electric customers of DESC for the NND Project, a $277 million after-tax charge for certain regulatory assets and property, plant and equipment acquired in the SCANA Combination for which Dominion Energy committed to forego recovery and $134 million after-tax charge for litigation acquired in the SCANA Combination) and a $409 million after-tax charge for the planned early retirement of certain Virginia Power electric generation facilities and automated metering reading infrastructure Dominion Energy’s 2018 results include the impact of the following significant items: • Fourth quarter results include $536 million of after-tax after-tax • Second quarter results include an $89 million after-tax • First quarter results include a $160 million after-tax one-time Virginia Power Virginia Power’s quarterly results of operations were as follows: First Second Third Fourth (millions) 2019 Operating revenue $ 1,965 $ 1,938 $ 2,264 $ 1,941 Income from operations 122 238 820 659 Net income 20 100 602 427 2018 Operating revenue $ 1,748 $ 1,829 $ 2,232 $ 1,810 Income from operations 364 533 756 418 Net income 184 339 520 239 Virginia Power’s 2019 results include the impact of the following significant item: • Second quarter results include a $144 million after-tax charge related to a voluntary retirement program, a $100 million after-tax charge related to a contract termination with a non-utility generator and a $47 million after-tax charge for the abandonment of a project at an electric generation facility. • First quarter results include a $409 million after-tax for the planned early retirement of certain electric generation facilities and automated metering reading infrastructure, partially offset by an $84 million after-tax revision to future ash ponds and landfill closure costs. Virginia Power’s 2018 results include the impact of the following significant item: • First quarter results include a $160 million after-tax one-time Dominion Energy Gas Dominion Energy Gas’ quarterly results of operations were as follows: First Second Third Fourth (millions) 2019 Operating revenue $566 $530 $502 $571 Income from continuing operations 247 179 202 276 Net income from continuing operations 172 123 130 276 Net income from discontinued operations 54 26 45 16 Net income including noncontrolling interests 226 149 175 292 Net income attributable to 190 119 151 261 2018 Operating revenue $389 $508 $533 $566 Income from continuing operations 167 90 302 228 Net income from continuing operations 157 84 209 182 Net income (loss) from discontinued operations 56 45 33 (110 ) Net income including noncontrolling interests 213 129 242 72 Net income attributable to Dominion Energy Gas 180 83 191 27 Dominion Energy Gas’s 2019 results include the impact of the following significant items: • Second quarter results include a $58 million after-tax charge related to a voluntary retirement program , including $32 million in discontinued operations. Dominion Energy Gas’s 2018 results include the impact of the following significant items: • Fourth quarter results include a $165 million after-tax • Second quarter results include an $89 million after-tax

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Estimates	The Companies make certain estimates and assumptions in preparing their Consolidated Financial Statements in accordance with GAAP. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues, expenses and cash flows for the periods presented. Actual results may differ from those estimates.
Consolidation	The Companies’ Consolidated Financial Statements include, after eliminating intercompany transactions and balances, their accounts, those of their respective majority-owned subsidiaries and non-wholly-owned
Consolidation, consolidated entities and noncontrolling interest	For certain partnership structures, income is allocated based on the liquidation value of the underlying contractual arrangements. At December 31, 2019 Dominion Energy owns 50% of the voting interests in Four Brothers and Three Cedars and has a controlling financial interest over the entities through its right to control operations. In August 2018, NRG’s ownership interest in Four Brothers and Three Cedars was transferred to GIP. GIP’s ownership interest in Four Brothers and Three Cedars, Terra Nova Renewable Partners’ 33% interest in certain Dominion Energy’s merchant solar projects, Brookfield’s 25% interest in Cove Point and the non-Dominion Energy held interest in Dominion Energy Midstream (through January 2019) are reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements.
Reclassifications	Certain amounts in the Companies’ 2018 and 2017 Consolidated Financial Statements and Notes have been reclassified to conform to the 2019 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows.
Operating Revenue	Operating Revenue Operating revenue is recorded on the basis of services rendered, commodities delivered, or contracts settled and includes amounts yet to be billed to customers. Dominion Energy and Virginia Power collect sales, consumption and consumer utility taxes and Dominion Energy Gas collects sales taxes; however, these amounts are excluded from revenue. Dominion Energy’s customer receivables at December 31, 2019 and 2018 included $896 million and $626 million, respectively, of accrued unbilled revenue based on estimated amounts of electricity and natural gas delivered but not yet billed to its utility customers. Virginia Power’s customer receivables at December 31, 2019 and 2018 included $512 million and $392 million, respectively, of accrued unbilled revenue based on estimated amounts of electricity delivered but not yet billed to its customers. Dominion Energy Gas’ customer receivables at December 31, 2019 and 2018 included $104 million and $101 million, respectively, of accrued unbilled revenue based on estimated amounts of natural gas delivered but not yet billed to its customers. See Note 25 for amounts attributable to related parties. The primary types of sales and service activities reported as operating revenue for Dominion Energy, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales • Nonregulated electric sales • Regulated gas sales • Nonregulated gas sales • Regulated gas transportation and storage sales • Nonregulated gas transportation and storage sales • Other regulated revenue • Other nonregulated revenue Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales • Nonregulated electric sales • Regulated gas sales • Nonregulated gas sales • Gas transportation and storage sales • Other revenue The primary types of sales and service activities reported as operating revenue for Virginia Power, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales • Other regulated revenue • Other nonregulated revenue non-jurisdictional Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Virginia Power, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated gas sales—wholesale • Nonregulated gas sales • Regulated gas transportation and storage sales • Nonregulated gas transportation and storage sales • Management service revenue • Other regulated revenue • Other nonregulated revenue Other Revenue • Other revenue The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated gas sales • Nonregulated gas sales • Gas transportation and storage sales • Other revenue O perating revenue for East Ohio and DGP consists primarily of state-regulated natural gas sales and related distribution services, state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of NGL gathering and processing activities, and is included in net income from discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income through November 6, 2019. Dominion Energy and Virginia Power record refunds to customers as required by state commissions as a reduction to regulated electric sales or regulated gas sales, as applicable. Dominion Energy and Virginia Power’s revenue accounted for under the alternative revenue program guidance primarily consists of the equity return for under-recovery of certain riders. Alternative revenue programs compensate Dominion Energy and Virginia Power for certain projects and initiatives. Revenues arising from these programs are presented separately from revenue arising from contracts with customers in the categories above. Revenues from electric and gas sales are recognized over time, as the customers of the Companies consume gas and electricity as it is delivered. Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. LNG terminalling services are also stand-ready service contracts, primarily consisting of fixed fees, offset by service credits associated with the start-up Dominion Energy and Dominion Energy Gas typically receive or retain NGLs and natural gas from customers when providing natural gas processing, transportation or storage services. Dominion Energy and Dominion Energy Gas record the fair value of NGLs received during natural gas processing as service revenue recognized over time, and continue to recognize revenue from the subsequent sale of the NGLs to customers upon delivery. Dominion Energy and Dominion Energy Gas typically retain natural gas under certain transportation service arrangements that are intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the allowance is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue.
Electric Fuel, Purchased Energy and Purchased Gas-Deferred Costs	Electric Fuel, Purchased Energy and Purchased Gas-Deferred Where permitted by regulatory authorities, the differences between Dominion Energy and Virginia Power’s actual electric fuel and purchased energy expenses and Dominion Energy and Dominion Energy Gas’ purchased gas expenses and the related levels of recovery for these expenses in current rates are deferred and matched against recoveries in future periods. The deferral of costs in excess of current period fuel rate recovery is recognized as a regulatory asset, while rate recovery in excess of current period fuel expenses is recognized as a regulatory liability. Of the cost of fuel used in electric generation and energy purchases to serve Virginia utility customers, at December 31, 2019, approximately 84% is subject to Virginia Power’s deferred fuel accounting, while substantially all of the remaining amount is subject to recovery through similar mechanisms. Virtually all of East Ohio, Questar Gas, Hope, DESC and PSNC’s natural gas purchases are either subject to deferral accounting or are recovered from the customer in the same accounting period as the sale.
Income Taxes	Income Taxes A consolidated federal income tax return is filed for Dominion Energy and its subsidiaries, including Virginia Power and Dominion Energy Gas’ subsidiaries. In addition, where applicable, combined income tax returns for Dominion Energy and its subsidiaries are filed in various states; otherwise, separate state income tax returns are filed. Although Dominion Energy Gas and certain of its subsidiaries are disregarded for income tax purposes, a provision for income taxes is recognized to reflect the inclusion of its business activities in the tax returns of its parent, Dominion Energy. Virginia Power and Dominion Energy Gas participate in intercompany tax sharing agreements with Dominion Energy and its subsidiaries. Current income taxes are based on taxable income or loss and credits determined on a separate company basis. Under the agreements, if a subsidiary incurs a tax loss or earns a credit, recognition of current income tax benefits is limited to refunds of prior year taxes obtained by the carryback of the net operating loss or credit or to the extent the tax loss or credit is absorbed by the taxable income of other Dominion Energy consolidated group members. Otherwise, the net operating loss or credit is carried forward and is recognized as a deferred tax asset until realized. The 2017 Tax Reform Act included a broad range of tax reform provisions affecting the Companies, including changes in corporate tax rates and business deductions. The 2017 Tax Reform Act reduces the corporate income tax rate from 35% to 21% for tax years beginning after December 31, 2017. Deferred tax assets and liabilities are classified as noncurrent in the Consolidated Balance Sheets and measured at the enacted tax rate expected to apply when temporary differences are realized or settled. Thus, at the date of enactment, federal deferred taxes were remeasured based upon the new 21% tax rate. The total effect of tax rate changes on deferred tax balances was recorded as a component of the income tax provision related to continuing operations for the period in which the law is enacted, even if the assets and liabilities relate to other components of the financial statements, such as items of accumulated other comprehensive income. For Dominion Energy subsidiaries that are not rate-regulated utilities, existing deferred income tax assets or liabilities were adjusted for the reduction in the corporate income tax rate and allocated to continuing operations. Dominion Energy’s rate-regulated utility subsidiaries likewise were required to adjust deferred income tax assets and liabilities for the change in income tax rates. However, if it is probable that the effect of the change in income tax rates will be recovered or refunded in future rates, the regulated utility recorded a regulatory asset or liability instead of an increase or decrease to deferred income tax expense. Accounting for income taxes involves an asset and liability approach. Deferred income tax assets and liabilities are provided, representing future effects on income taxes for temporary differences between the bases of assets and liabilities for financial reporting and tax purposes. Accordingly, deferred taxes are recognized for the future consequences of different treatments used for the reporting of transactions in financial accounting and income tax returns. The Companies establish a valuation allowance when it is more-likely-than-not The Companies recognize positions taken, or expected to be taken, in income tax returns that are more-likely-than-not If it is not more-likely-than-not The Companies recognize interest on underpayments and overpayments of income taxes in interest expense and other income, respectively. Penalties are also recognized in other income. Interest expense for the Companies was immaterial in 2019 and 2018. Dominion Energy and Virginia Power both recognized interest income of $11 million in 2017. Dominion Energy Gas’ interest was immaterial in 2017. The Companies’ penalties were immaterial in 2019, 2018 and 2017. At December 31, 2019, Virginia Power had an income tax-related In addition, Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 included $10 million of state income taxes receivable. State income taxes receivable at Virginia Power were immaterial at December 31, 2019. At December 31, 2018, Virginia Power had an income tax-related In addition, Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 included $15 million of state income taxes receivable. State income taxes receivable at Virginia Power were immaterial at December 31, 2018. Investment tax credits are recognized by nonregulated operations in the year qualifying property is placed in service. For regulated operations, investment tax credits are deferred and amortized over the service lives of the properties giving rise to the credits. Production tax credits are recognized as energy is generated and sold.
Cash, Restricted Cash and Equivalents	Cash, Restricted Cash and Equivalents Cash, restricted cash and equivalents include cash on hand, cash in banks and temporary investments purchased with an original maturity of three months or less. Current banking arrangements generally do not require checks to be funded until they are presented for payment. The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies: At December 31, 2019 2018 (millions) Dominion Energy $ 29 $ 35 Virginia Power 9 16 Dominion Energy Gas 6 7 Restricted Cash and Equivalents The Companies hold restricted cash and equivalent balances that primarily consist of amounts held for litigation settlements, customer deposits and future debt payments on SBL Holdco and Dominion Solar Projects III, Inc.’s term loan agreements and on Eagle Solar’s senior note agreement. The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within the Companies’ Consolidated Balance Sheets to the corresponding amounts reported within the Companies’ Consolidated Statements of Cash Flows for the years ended December 31, 2019, 2018 and 2017: Cash, Restricted Cash and Equivalents at December 31, December 31, December 31, December 31, (millions) Dominion Energy Cash and cash equivalents $166 $268 $120 $261 Restricted cash and equivalents (1) 103 123 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $269 $391 $185 $322 Virginia Power Cash and cash equivalents $ 17 $ 29 $ 14 $ 11 Restricted cash and equivalents (1) 7 9 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 24 $ 38 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents (2) $ 27 $108 $ 18 $ 76 Restricted cash and equivalents (1) 12 90 39 45 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $198 $ 57 $121 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. (2) At December 31, 2018, 2017 and 2016, Dominion Energy Gas had $9 million, $3 million and $14 million of cash and cash equivalents included in current assets of discontinued operations, respectively. Distributions from Equity Method Investees Dominion Energy and Dominion Energy Gas each hold investments that are accounted for under the equity method of accounting. Dominion Energy and Dominion Energy Gas classify distributions from equity method investees as either cash flows from operating activities or cash flows from investing activities in the Consolidated Statements of Cash Flows according to the nature of the distribution. Distributions received are classified on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment (classified as cash flows from operating activities) or a return of an investment (classified as cash flows from investing activities) when such information is available to Dominion Energy and Dominion Energy Gas.
Derivative Instruments	Derivative Instruments The Companies are exposed to the impact of market fluctuations in the price of electricity, natural gas and other energy-related products they market and purchase, as well as interest rate and foreign currency exchange rate risks of their business operations. Dominion Energy uses derivative instruments such as physical and financial forwards, futures, swaps, options and FTRs to manage the commodity, interest rate and foreign currency exchange rate risks of its business operations. Virginia Power uses derivative instruments such as physical and financial forwards, futures, swaps, options and FTRs to manage commodity and interest rate risks. Dominion Energy Gas uses derivative instruments such as physical and financial forwards, futures and swaps to manage commodity, interest rate and foreign currency exchange rate risks. All derivatives, except those for which an exception applies, are required to be reported in the Consolidated Balance Sheets at fair value. Derivative contracts representing unrealized gain positions and purchased options are reported as derivative assets. Derivative contracts representing unrealized losses and options sold are reported as derivative liabilities. One of the exceptions to fair value accounting, normal purchases and normal sales, may be elected when the contract satisfies certain criteria, including a requirement that physical delivery of the underlying commodity is probable. Expenses and revenues resulting from deliveries under normal purchase contracts and normal sales contracts, respectively, are included in earnings at the time of contract performance. The Companies do not offset amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. Dominion Energy had margin assets of $42 million and $95 million associated with cash collateral at December 31, 2019 and 2018, respectively. Dominion Energy’s margin liabilities of $2 million and less than $1 million associated with cash collateral at December 31, 2019 and 2018, respectively. Virginia Power had margin assets of less than $1 million associated with cash collateral at December 31, 2019. Virginia Power had no margin assets associated with cash collateral at December 31, 2018 and no margin liabilities associated with cash collateral at December 31, 2019 and 2018. Dominion Energy Gas had no margin assets or liabilities associated with cash collateral at December 31, 2019 and 2018. See Note 7 for further information about derivatives. To manage price risk, the Companies hold derivative instruments that are not designated as hedges for accounting purposes. However, to the extent the Companies do not hold offsetting positions for such derivatives, they believe these instruments represent economic hedges that mitigate their exposure to fluctuations in commodity prices. All income statement activity, including amounts realized upon settlement, is presented in operating revenue, operating expenses, interest and related charges or other income based on the nature of the underlying risk. Changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities for jurisdictions subject to cost-based rate regulation. Realized gains or losses on the derivative instruments are generally recognized when the related transactions impact earnings. Derivative Instruments Designated as Hedging Instruments In accordance with accounting guidance pertaining to derivatives and hedge accounting, the Companies designate a portion of their derivative instruments as either cash flow or fair value hedges for accounting purposes. For derivative instruments that are accounted for as cash flow hedges or fair value hedges, the cash flows from the derivatives and from the related hedged items are classified in operating cash flows. Cash Flow Hedges Dominion Energy entered into interest rate derivative instruments to hedge its forecasted interest payments related to planned debt issuances in 2014. These interest rate derivatives were designated by Dominion Energy as cash flow hedges prior to the formation of Dominion Energy Gas. For the purposes of the Dominion Energy Gas financial statements, the derivative balances, AOCI balance, and any income statement impact related to these interest rate derivative instruments entered into by Dominion Energy have been, and will continue to be, included in the Dominion Energy Gas’ Consolidated Financial Statements as the forecasted interest payments related to the debt issuances now occur at Dominion Energy Gas. Fair Value Hedges
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is recorded at lower of original cost or fair value, if impaired. Capitalized costs include labor, materials and other direct and indirect costs such as asset retirement costs, capitalized interest and, for certain operations subject to cost-of-service In 2019, 2018 and 2017, Dominion Energy capitalized interest costs and AFUDC to property, plant and equipment of $89 million, $134 million and $236 million, respectively. In 2019, 2018 and 2017, Virginia Power capitalized AFUDC to property, plant and equipment of $34 million, $56 million and $37 million, respectively. In 2019, 2018 and 2017, Dominion Energy Gas capitalized AFUDC to property, plant and equipment of $31 million, $25 million and $34 million, respectively. Under Virginia law, certain Virginia jurisdictional projects qualify for current recovery of AFUDC through rate adjustment clauses. AFUDC on these projects is calculated and recorded as a regulatory asset and is not capitalized to property, plant and equipment. In 2019, 2018 and 2017, Virginia Power recorded $11 million, $4 million and $22 million of AFUDC related to these projects, respectively. For property subject to cost-of-service cost-of-service plant-in-service In 2019, Virginia Power had the following charges, primarily recorded in impairment of assets and other charges in the Consolidated Statements of Income (reflected in the Corporate and Other segment), related to early retirements: • In January 2019, Virginia Power committed to a plan to retire certain automated metering reading infrastructure associated with its electric operations before the end of its estimated useful life and replace such equipment with more current AMI technology. As a result, Virginia Power recorded a charge of $160 million ($119 million after-tax). • In March 2019, Virginia Power committed to retire certain electric generating units before the end of their useful lives and completed the retirement of certain units at six facilities representing 1,292 MW of electric generating capacity, which had previously been placed in cold reserve. An additional unit at Possum Point power station will be retired after it meets its capacity obligation to PJM in 2021. As a result, Virginia Power recorded a charge of $346 million ($257 million after-tax • In May 2019, Virginia Power abandoned a coal rail project at its Mt. Storm generating facility. As a result, Virginia Power recorded a charge of $62 million ($46 million after-tax). • In September 2019, Dominion Energy and Virginia Power abandoned certain property, plant and equipment before the end of its useful life. As a result, Dominion Energy recorded a charge of $26 million ($19 million after-tax) after-tax). For property that is not subject to cost-of-service Depreciation of property, plant and equipment is computed on the straight-line method based on projected service lives. The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows: Year Ended December 31, 2019 2018 2017 (percent) Dominion Energy Generation 2.84 2.71 2.94 Transmission 2.47 2.54 2.55 Distribution 2.80 2.97 3.00 Storage 2.40 2.40 2.48 General and other 4.04 4.20 4.38 Virginia Power Generation 2.94 2.71 2.94 Transmission 2.54 2.52 2.54 Distribution 3.14 3.31 3.32 General and other 4.40 4.52 4.68 Dominion Energy Gas (1) Transmission 2.43 2.66 2.67 Storage 2.53 2.42 2.51 General and other 4.59 4.18 5.08 (1) Excludes rates for depreciation reported as discontinued operations. Virginia Power expects to receive an updated depreciation study for its nuclear plants in the first quarter of 2020, which is anticipated to reflect lower depreciation rates as a result of expected approval of license extensions from the NRC. In 2018, Virginia Power revised depreciation rates for regulated nuclear plants to comply with Virginia Commission requirements. For the year ended December 31, 2018, this adjustment resulted in a decrease of $60 million ($44 million after-tax) after-tax). In 2017, Virginia Power revised the depreciation rates for its assets to reflect the results of a new depreciation study. This change resulted in an increase in annual depreciation expense of $40 million ($25 million after-tax) after-tax) Virginia Power’s non-jurisdictional property, plant and equipment is depreciated using the straight-line method over an estimated useful life of 30 years. Capitalized costs of development wells and leaseholds are amortized on a field-by-field unit-of-production Dominion Energy’s nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives: Asset Estimated Useful Lives Merchant generation-nuclear 44 years Merchant generation-other 15-30 Nonutility gas gathering and processing 3-50 LNG facility 40 years General and other 5-59 Depreciation and amortization related to Virginia Power and Dominion Energy Gas’ nonutility property, plant and equipment and exploration and production properties was immaterial for the years ended December 31, 2019, 2018 and 2017, except for Dominion Energy Gas’ nonutility LNG facility which is depreciated using the straight-line method over an estimated useful life of 40 years. Nuclear fuel used in electric generation is amortized over its estimated service life on a units-of-production
Long-Lived and Intangible Assets	Long-Lived and Intangible Assets The Companies perform an evaluation for impairment whenever events or changes in circumstances indicate that the carrying amount of long-lived assets or intangible assets with finite lives may not be recoverable. A long-lived or intangible asset is written down to fair value if the sum of its expected future undiscounted cash flows is less than its carrying amount. Intangible assets with finite lives are amortized over their estimated useful lives. See Note 6 for further discussion on the impairment of long-lived assets.
Regulatory Assets and Liabilities	Regulatory Assets and Liabilities The accounting for the Companies’ regulated electric and gas operations differs from the accounting for nonregulated operations in that the Companies are required to reflect the effect of rate regulation in their Consolidated Financial Statements. For regulated businesses subject to federal or state cost-of-service The Companies evaluate whether or not recovery of its regulatory assets through future rates is probable as well as whether a regulatory liability due to customers is probable and makes various assumptions in its analyses. These analyses are generally based on: • Orders issued by regulatory commissions, legislation and judicial actions; • Past experience; • Discussions with applicable regulatory authorities and legal counsel; • Forecasted earnings; and • Considerations around the likelihood of impacts from events such as unusual weather conditions, extreme weather events and other natural disasters and unplanned outages of facilities. Generally, regulatory assets and liabilities are amortized into income over the period authorized by the regulator. If recovery of a regulatory asset is determined to be less than probable, it will be written off in the period such assessment is made. A regulatory liability, if considered probable, will be recorded in the period such assessment is made or reversed into earnings if no longer probable. See Notes 12 and 13 to the Consolidated Financial Statements for additional information
Leases	Leases The Companies lease certain assets including vehicles, real estate, office equipment and other operational assets under both operating and finance leases. For the Companies’ operating leases, rent expense is recognized on a straight-line basis over the term of the lease agreement, subject to regulatory framework. Rent expense associated with operating leases, short-term leases and variable leases is primarily recorded in other operations and maintenance expense in the Companies’ Consolidated Statements of Income. Rent expense associated with finance leases results in the separate presentation of interest expense on the lease liability and amortization expense of the related right-of-use Certain of the Companies’ leases include one or more options to renew, with renewal terms that can extend the lease from one right-of-use The determination of the discount rate utilized has a significant impact on the calculation of the present value of the lease liability included in the Companies’ Consolidated Balance Sheets. For the Companies’ fleet of leased vehicles, the discount rate is equal to the prevailing borrowing rate earned by the lessor. For the Companies’ remaining leased assets, the discount rate implicit in the lease is generally unable to be determined from a lessee perspective. As such, the Companies use internally-developed incremental borrowing rates as a discount rate in the calculation of the present value of the lease liability. The incremental borrowing rates are determined based on an analysis of the Companies’ publicly available unsecured borrowing rates, adjusted for a collateral discount, over various lengths of time that most closely correspond to the Companies’ lease maturities. In addition, Dominion Energy acts as lessor under certain power purchase agreements in which the counterparty or counterparties purchase substantially all of the output of certain solar facilities. These leases are considered operating in nature. For such leasing arrangements, rental revenue and an associated accounts receivable are recorded when the monthly output of the solar facility is determined. Depreciation on these solar facilities is computed on a straight-line basis over an estimated useful life of 30 years.
Asset Retirement Obligations	Asset Retirement Obligations The Companies recognize AROs at fair value as incurred or when sufficient information becomes available to determine a reasonable estimate of the fair value of future retirement activities to be performed, for which a legal obligation exists. These amounts are generally capitalized as costs of the related tangible long-lived assets. Since relevant market information is not available, fair value is estimated using discounted cash flow analyses. Quarterly, the Companies assess their AROs to determine if circumstances indicate that estimates of the amounts or timing of future cash flows associated with retirement activities have changed. AROs are adjusted when significant changes in the amounts or timing of future cash flows are identified. Dominion Energy and Dominion Energy Gas report accretion of AROs and depreciation on asset retirement costs associated with their natural gas pipeline and storage well assets as an adjustment to the related regulatory liabilities when revenue is recoverable from customers for AROs. Dominion Energy and Virginia Power report accretion of AROs and depreciation on asset retirement costs associated with decommissioning its nuclear power stations as an adjustment to the regulatory liability for certain jurisdictions. Additionally, Dominion Energy and Virginia Power report accretion of AROs and depreciation on asset retirement costs associated with certain rider and prospective rider projects as an adjustment to the regulatory asset for certain jurisdictions. Accretion of all other AROs and depreciation of all other asset retirement costs are reported in other operations and maintenance expense and depreciation expense, respectively, in the Consolidated Statements of Income.
Debt Issuance Costs	Debt Issuance Costs The Companies defer and amortize debt issuance costs and debt premiums or discounts over the expected lives of the respective debt issues, considering maturity dates and, if applicable, redemption rights held by others. Deferred debt issuance costs are recorded as a reduction in long-term debt in the Consolidated Balance Sheets. Amortization of the issuance costs is reported as interest expense. Unamortized costs associated with redemptions of debt securities prior to stated maturity dates are generally recognized and recorded in interest expense immediately. As permitted by regulatory authorities, gains or losses resulting from the refinancing or redemption of debt allocable to utility operations subject to cost-based rate regulation are deferred and amortized.
Investments	Investments Debt and Equity Securities with Readily Determinable Fair Values Dominion Energy accounts for and classifies investments in debt securities as trading or available-for-sale available-for-sale • Debt securities classified as trading securities tain deferred compensation plans. These securities are reported in other investments in the Consolidated Balance Sheets at fair value with net realized and unrealized gains and losses included in other income in the Consolidated Statements of Income. • Debt securities classified as available-for-sale securities available-for-sale after-tax. In determining realized gains and losses for debt securities, the cost basis of the security is based on the specific identification method. Equity securities with readily determinable fair values include securities held by Dominion Energy in rabbi trusts associated with certain deferred compensation plans and securities held by Dominion Energy and Virginia Power in the nuclear decommissioning trusts. Dominion Energy and Virginia Power record all equity securities with a readily determinable fair value, or for which they are permitted to estimate fair value using NAV (or its equivalent), at fair value in nuclear decommissioning trust funds and other investments in the Consolidated Balance Sheets. However, Dominion Energy and Virginia Power may elect a measurement alternative for equity securities without a readily determinable fair value. Under the measurement alternative, equity securities are reported at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Dominion Energy and Virginia Power qualitatively assess equity securities reported using the measurement alternative to determine whether an investment is impaired on an ongoing basis. Net realized and unrealized gains and losses on equity securities held in Virginia Power’s nuclear decommissioning trusts are recorded to a regulatory liability for certain jurisdictions subject to cost-based regulation. For all other equity securities, including those held in Dominion Energy’s merchant generation nuclear decommissioning trusts and rabbi trusts, net realized and unrealized gains and losses are included in other income in the Consolidated Statements of Income. Equity Securities without Readily Determinable Fair Values The Companies account for illiquid and privately held securities without readily determinable fair values under either the equity method or cost method. Equity securities without readily determinable fair values include: • Equity method investments investee. Dominion Energy and Dominion Energy Gas’ investments are included in investments in equity method affiliates in their Consolidated Balance Sheets. Dominion Energy and Dominion Energy Gas record equity method adjustments in other income and earnings from equity method investees, respectively, in their Consolidated Statements of Income, including their proportionate share of investee income or loss, gains or losses resulting from investee capital transactions, amortization of certain differences between the carrying value and the equity in the net assets of the investee at the date of investment and other adjustments required by the equity method. • Cost method investments Other-Than-Temporary Impairment The Companies periodically review their investments in debt securities and equity method investments to determine whether a decline in fair value should be considered other-than-temporary. If a decline in the fair value of any security is determined to be other-than-temporary, the security is written down to its fair value at the end of the reporting period. Decommissioning Trust Investments —Special Considerations for Debt Securities • The recognition provisions of other-than-temporary impairment guidance apply only to debt securities classified as available-for-sale held-to-maturity. • Using information obtained from their nuclear decommissioning trust fixed-income investment managers, Dominion Energy and Virginia Power record in earnings any unrealized loss for a debt security when the manager intends to sell the debt security or it is more-likely-than-not non-performance
Inventories	Inventories Materials and supplies and fossil fuel inventories are valued primarily using the weighted-average cost method. Stored gas inventory is valued using the weighted-average cost method, except for East Ohio gas distribution operations, which are valued using the LIFO method. Under the LIFO method, current stored gas inventory was valued at $19 million and $12 million at December 31, 2019 and December 31, 2018, respectively. Based on the average price of gas purchased during 2019 and 2018, the cost of replacing the current portion of stored gas inventory exceeded the amount stated on a LIFO basis by $60 million and $87 million, respectively. As a result of the Dominion Energy Gas Restructuring, at December 31, 2018, East Ohio’s stored gas inventory is reported in current assets of discontinued operations in the Consolidated Balance Sheets of Dominion Energy Gas.
Gas Imbalances	Gas Imbalances Natural gas imbalances occur when the physical amount of natural gas delivered from, or received by, a pipeline system or storage facility differs from the contractual amount of natural gas delivered or received. Dominion Energy and Dominion Energy Gas value these imbalances due to, or from, shippers and operators at an appropriate index price at period end, subject to the terms of its tariff for regulated entities. Imbalances are primarily settled in-kind.
Goodwill	Goodwill Dominion Energy and Dominion Energy Gas evaluate goodwill for impairment annually as of April 1 and whenever an event occurs or circumstances change in the interim that would more- likely-than-not
New Accounting Standards	New Accounting Standards Revenue Recognition In May 2014, the FASB issued revised accounting guidance for revenue recognition from contracts with customers. The Companies adopted this revised accounting guidance for interim and annual reporting periods beginning January 1, 2018 using the modified retrospective method. Upon the adoption of the standard, Dominion Energy and Dominion Energy Gas recorded the cumulative-effect of a change in accounting principle of $3 million to retained earnings and membership interests, respectively, and to establish a contract asset related to changes in the timing of revenue recognition for three existing contracts with customers at DETI. As a result of adopting this revised accounting guidance, Dominion Energy records offsetting operating revenue and other energy-related purchases for non-cash Financial Instruments In January 2016, the FASB issued revised accounting guidance for the recognition, measurement, presentation and disclosure of financial instruments. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018 and the Companies adopted the standard using the modified retrospective method. Upon adoption of this guidance for equity securities held at January 1, 2018, Dominion Energy and Virginia Power recorded the cumulative-effect of a change in accounting principle to reclassify net unrealized gains from AOCI to retained earnings and to recognize equity securities previously categorized as cost method investments at fair value (using NAV) in nuclear decommissioning trust funds in the Consolidated Balance Sheets and a cumulative-effect adjustment to retained earnings. Dominion Energy and Virginia Power reclassified approximately $1.1 billion ($734 million after-tax) after-tax), after-tax) after-tax) after-tax) Leases In February 2016, the FASB issued revised accounting guidance for the recognition, measurement, presentation and disclosure of leasing arrangements. The update requires that a liability and corresponding right-of-use The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2019. The Companies adopted this revised accounting guidance using a modified retrospective approach, which requires lessees and lessors to recognize and measure leases at the date of adoption. Under this approach, the Companies utilized the transition practical expedient to maintain historical presentation for periods before January 1, 2019. The Companies also applied the other practical expedients, which required no reassessment of whether existing contracts are or contain leases, no reassessment of lease classification for existing leases and no reassessment of existing or expired land easements that were not previously accounted for as leases. In connection with the adoption of this revised accounting guidance, Dominion Energy, Virginia Power and Dominion Energy Gas recorded $504 million, $209 million and $64 million, respectively, of offsetting right-of-use right-of-use at Dominion Energy Gas were associated with discontinued operations. See Note 15 for additional information. Derecognition And Partial Sales Of Nonfinancial Assets In February 2017, the FASB issued revised accounting guidance clarifying the scope of asset derecognition guidance and accounting for partial sales of nonfinancial assets. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018, and the Companies adopted the standard using the modified retrospective method. Upon adoption of the standard, Dominion Energy recorded the cumulative-effect of a change in accounting principle to reclassify $127 million from noncontrolling interests to common stock related to the sale of a noncontrolling interest in certain merchant solar projects completed in December 2015 and January 2016. Net Periodic Pension And Other Postretirement Benefit Costs In March 2017, the FASB issued revised accounting guidance for the presentation of net periodic pension and other postretirement benefit costs. This guidance became effective for the Companies beginning January 1, 2018 and requires that the service cost component of net periodic pension and other postretirement benefit costs be classified in the same line item as other compensation costs arising from services rendered by employees, while all other components of net periodic pension and other postretirement costs are classified outside of income from operations. In addition, only the service cost component remains eligible for capitalization during construction. These changes do not impact the accounting by participants in a multi-employer plan. The standard also recognizes that in the event that a regulator continues to require capitalization of all net periodic benefit costs prospectively, the difference would result in recognition of a regulatory asset or liability. For costs not capitalized for which regulators are expected to provide recovery, a regulatory asset will be established. As such, the amounts eligible for capitalization in the Consolidated Financial Statements of Virginia Power and Dominion Energy Gas, as subsidiary participants in Dominion Energy’s multi-employer plans, will differ from the amounts eligible for capitalization in the Consolidated Financial Statements of Dominion Energy, the plan administrator. These differences will result in a regulatory asset or liability recorded in the Consolidated Financial Statements of Dominion Energy. Tax Reform In December 2017, the staff of the SEC issued guidance which clarifies accounting for income taxes if information is not yet available or complete and provided for up to a one-year Reform Act being enacted. The Companies have accounted for the effects of the 2017 Tax Reform Act, although additional changes could occur as guidance is issued and finalized as described below. In addition, the major states in which the Companies operate have addressed conformity with some or all of the provisions of the 2017 Tax Reform Act, although some states have modified certain of these provisions. In August 2018, the U.S. Department of Treasury issued proposed regulations addressing the availability of federal bonus depreciation for the period beginning after September 27, 2017 through December 31, 2017. The application of these changes decreased Dominion Energy’s net operating loss carryforward utilization on its 2017 tax return. The impacts of proposed and final regulations issued in 2019 on the applicability of accelerated depreciation were immaterial at the Companies, as discussed in Note 5. In November 2018, the U.S. Department of Treasury issued proposed regulations defining interest as any amounts associated with the time value of money or use of funds. These proposed regulations provide guidance for purposes of the exception to the interest limitation for regulated public utilities, the application of the interest limitation to consolidated groups, such as Dominion Energy, and the interest limitation with respect to partnerships and partners in those partnerships. It is unclear when the guidance may be finalized, or whether that guidance could result in a disallowance of a portion of the Companies’ interest deductions in the future. In February 2018, the FASB issued revised accounting guidance to provide clarification on the application of the 2017 Tax Reform Act for balances recorded within AOCI. The revised guidance provides for stranded amounts within AOCI from the impacts of the 2017 Tax Reform Act to be reclassified to retained earnings. The Companies adopted this guidance for interim and annual reporting periods beginning January 1, 2018 on a prospective basis. In connection with the adoption of this guidance, Dominion Energy reclassified a benefit of $289 million from AOCI to retained earnings, Virginia Power reclassified a benefit of $3 million from AOCI to retained earnings and Dominion Energy Gas reclassified a benefit of $26 million from AOCI to membership interests. The amounts reclassified reflect the reduction in the federal income tax rate, and the federal benefit of state income taxes, on the components of the Companies’ AOCI.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of Checks Outstanding but Not Yet Presented for Payment	The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies: At December 31, 2019 2018 (millions) Dominion Energy $ 29 $ 35 Virginia Power 9 16 Dominion Energy Gas 6 7
Reconciliation of Total Cash, Restricted Cash and Equivalents	The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within the Companies’ Consolidated Balance Sheets to the corresponding amounts reported within the Companies’ Consolidated Statements of Cash Flows for the years ended December 31, 2019, 2018 and 2017: Cash, Restricted Cash and Equivalents at December 31, December 31, December 31, December 31, (millions) Dominion Energy Cash and cash equivalents $166 $268 $120 $261 Restricted cash and equivalents (1) 103 123 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $269 $391 $185 $322 Virginia Power Cash and cash equivalents $ 17 $ 29 $ 14 $ 11 Restricted cash and equivalents (1) 7 9 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 24 $ 38 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents (2) $ 27 $108 $ 18 $ 76 Restricted cash and equivalents (1) 12 90 39 45 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $198 $ 57 $121 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. (2) At December 31, 2018, 2017 and 2016, Dominion Energy Gas had $9 million, $3 million and $14 million of cash and cash equivalents included in current assets of discontinued operations, respectively.
Schedule of Depreciation Rates	The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows: Year Ended December 31, 2019 2018 2017 (percent) Dominion Energy Generation 2.84 2.71 2.94 Transmission 2.47 2.54 2.55 Distribution 2.80 2.97 3.00 Storage 2.40 2.40 2.48 General and other 4.04 4.20 4.38 Virginia Power Generation 2.94 2.71 2.94 Transmission 2.54 2.52 2.54 Distribution 3.14 3.31 3.32 General and other 4.40 4.52 4.68 Dominion Energy Gas (1) Transmission 2.43 2.66 2.67 Storage 2.53 2.42 2.51 General and other 4.59 4.18 5.08 (1) Excludes rates for depreciation reported as discontinued operations.
Property, Plant and Equipment	Dominion Energy’s nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives: Asset Estimated Useful Lives Merchant generation-nuclear 44 years Merchant generation-other 15-30 Nonutility gas gathering and processing 3-50 LNG facility 40 years General and other 5-59

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2019
East Ohio
Schedule of Results of Operations Reported As Discontinued Operations	The following table represents selected information regarding the results of operations of East Ohio, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income: Period Ended Year Ended Year Ended (millions) Operating revenue $ 594 $ 729 $ 728 Depreciation and amortization 73 76 71 Other operating expenses 399 444 428 Other income 61 72 50 Interest and related charges 33 37 33 Income tax expense 26 53 86 Net income from discontinued operations 124 191 160
Schedule of Major Classes of Assets and Liabilities Reported As Discontinued Operation	The carrying amounts of major classes of assets and liabilities relating to East Ohio, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets were as follows: At December 31, 2018 (millions) Current assets of discontinued operations (1) $ 423 Investments 2 Property, plant and equipment, net 3,669 Regulatory assets 711 Other deferred charges and other assets, including goodwill and intangible assets 1,275 Noncurrent assets of discontinued operations 5,657 Current liabilities of discontinued operations 1,262 Long-term debt 1,300 Deferred income taxes and investment tax credits 716 Regulatory liabilities 747 Other deferred credits and liabilities 108 Noncurrent liabilities of discontinued operations 2,871 (1) Includes cash and cash equivalents of $9 million as of December 31, 2018.
Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations	Capital expenditures and significant noncash items relating to East Ohio included the following: Period Ended Year Ended Year Ended (millions) Capital expenditures $ 299 $ 352 $ 348 Significant noncash items : Charge related to a voluntary retirement program 20 — — Accrued capital expenditures 2 5 8
DGP
Schedule of Results of Operations Reported As Discontinued Operations	The following table represents selected information regarding the results of operations of DGP, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Statements of Income: Period Ended Year Ended Year Ended (millions) Operating revenue $ 125 $ 220 $ 114 Depreciation and amortization 4 15 15 Impairment of assets and related charges — 219 — Other operating expenses 97 206 91 Income tax expense (benefit) 7 (53 ) 5 Net income (loss) from discontinued operations $ 17 $ (167 ) $ 3
Schedule of Major Classes of Assets and Liabilities Reported As Discontinued Operation	The carrying amounts of major classes of assets and liabilities relating to DGP, which are reported as discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets were as follows: At December 31, 2018 (millions) Current assets of discontinued operations (1) $ 21 Noncurrent assets of discontinued operations (2) 192 Current liabilities of discontinued operations 11 Noncurrent liabilities of discontinued operations 25 (1) Includes cash and cash equivalents of less than $1 million. (2) Primarily property, plant and equipment, net.
Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations	Capital expenditures and significant noncash items of DGP included the following: Period Ended Year Ended Year Ended (millions) Capital expenditures $ 11 $ 6 $ 8 Significant noncash : Impairment of assets and related charges — (219 ) —
SCANA
Schedule of Allocation of Purchase Price to Assets Acquired and Liabilities Assumed	The table below shows the allocation of the purchase price to the assets acquired and liabilities assumed at closing, which reflects certain adjustments related to income taxes, as discussed in Note 5, from the preliminary valuation recognized during the measurement period. Amount (millions) Total current assets (1) $ 1,782 Investments (2) 224 Property, plant and equipment (3)(4) 11,006 Goodwill 2,609 Regulatory assets (5) 3,940 Other deferred charges and other assets, including intangible assets (6) 430 Total Assets 19,991 Total current liabilities (7) 1,556 Long-term debt 6,707 Deferred income taxes 1,068 Regulatory liabilities 2,706 Other deferred credits and other liabilities (8) 1,115 Total Liabilities 13,152 Total purchase price (9) $ 6,839 (1) Includes $389 million of cash, restricted cash and equivalents, of which $115 million is considered restricted. (2) Includes $31 million for equity method investments. The fair value adjustment on the equity method investments is considered to be equity method goodwill and is not amortized. ( 3 Includes $105 million of certain property, plant and equipment associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. As a result, Dominion Energy’s Consolidated Statements of Income for the year ended December 31, 2019 include a charge of $105 million ($79 million after-tax), ( 4 Nonregulated property, plant and equipment, excluding land, will be depreciated on a straight-line basis over the remaining useful lives of such property, primarily ranging from 5 to 78 years. ( 5 Includes $258 million of certain income tax-related ( 6 Intangible assets have an estimated weighted-average amortization period of approximately five years. ( 7 Includes $40 million outstanding under letters of credit advances, which were repaid in January 2019, as well as $173 million outstanding commercial paper under various credit facilities. As discussed in Note 17, all credit facilities were terminated in 2019. ( 8 Includes a $379 million pension and other postretirement benefit liability. ( 9 Includes stock-based compensation awards with a fair value of $21 million.

Operating Revenue (Tables)

Operating Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers	The Companies’ operating revenue, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, consists of the following: Year Ended December 31, 2019 2018 (millions) Dominion Energy Regulated electric sales: Residential $ 4,325 $ 3,413 Commercial 3,219 2,503 Industrial 683 490 Government and other retail 873 854 Wholesale 176 137 Nonregulated electric sales 926 1,294 Regulated gas sales: Residential 1,343 818 Commercial 457 221 Other 117 36 Nonregulated gas sales 496 214 Regulated gas transportation and storage: FERC-regulated 1,057 1,091 State-regulated 742 640 Nonregulated gas transportation and storage 676 442 Other regulated revenues 259 179 Other nonregulated revenues (1)(2) 415 563 Total operating revenue from contracts with customers 15,764 12,895 Other revenues (2)(3) 808 471 Total operating revenue $ 16,572 $ 13,366 Virginia Power Regulated electric sales: Residential $ 3,657 $ 3,413 Commercial 2,712 2,503 Industrial 455 490 Government and other retail 823 854 Wholesale 128 137 Other regulated revenues 190 132 Other nonregulated revenues (1)(2) 71 55 Total operating revenue from contracts with customers 8,036 7,584 Other revenues (1)(3) 72 35 Total operating revenue $ 8,108 $ 7,619 Dominion Energy Gas Regulated gas sales—wholesale $ 9 $ 25 Nonregulated gas sales (1) 6 7 Regulated gas transportation and storage 1,300 1,249 Nonregulated gas transportation and storage 676 442 Management service revenue (1) 162 257 Other regulated revenues (1 )(2 ) 7 19 Other nonregulated revenues (1 )(2 ) 5 3 Total operating revenue from contracts with customers 2,165 2,002 Other revenues 4 (6 ) Total operating revenue $ 2,169 $ 1,996 (1) See Notes 9 and 25 for amounts attributable to related parties and affiliates. (2) Amounts above include sales which are considered to be goods transferred at a point in time. For the years ended December 31, 2019 and 2018, such amounts included $171 million and $241 million, respectively, at Dominion Energy and $5 million and $10 million, respectively, at Dominion Energy Gas, primarily consisting of NGL sales. Additionally, amounts above include sales of renewable energy credits. For the years ended December 31, 2019 and 2018, such sales were $24 million and $ 17 million, respectively, at Dominion Energy and $17 million and $11 million, respectively, at Virginia Power. (3) Includes alternative revenue of $66 million and $52 million for the year ended December 31, 2019 at Dominion Energy and Virginia Power, respectively, and $15 million for year ended December 31, 2018 at both Dominion Energy and Virginia Power.
Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized	The table below discloses the aggregate amount of the transaction price allocated to fixed-price performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period and when the Companies expect to recognize this revenue. These revenues relate to contracts containing fixed prices where the Companies will earn the associated revenue over time as they stand ready to perform services provided. This disclosure does not include revenue related to performance obligations that are part of a contract with original durations of one year or less. In addition, this disclosure does not include expected consideration related to performance obligations for which the Companies elect to recognize revenue in the amount they have a right to invoice. Revenue expected to be recognized on multi-year contracts in place at December 31, 2019 2020 2021 2022 2023 2024 Thereafter Total (millions) Dominion Energy $ 1,569 $ 1,470 $ 1,363 $ 1,216 $ 1,104 $ 12,519 $ 19,241 Virginia Power 3 1 — — — — 4 Dominion Energy Gas 1,723 1,624 1,495 1,325 1,185 12,783 20,135
Subsequent To Adoption of Revised Guidance
Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers	The Companies’ operating revenue, prior to the adoption of revised guidance for revenue recognition from contracts with customers, consisted of the following: Year Ended December 31 2017 (millions) Dominion Energy Electric sales: Regulated $ 7,383 Nonregulated 1,429 Gas sales: Regulated 1,067 Nonregulated 457 Gas transportation and storage 1,786 Other 464 Total operating revenue $ 12,586 Virginia Power Regulated electric sales $ 7,383 Other 173 Total operating revenue $ 7,556 Dominion Energy Gas Gas sales: Regulated $ 6 Nonregulated 6 Gas transportation and storage 1,291 Other 220 Total operating revenue $ 1,523

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense for continuing operations including noncontrolling interests	Continuing Operations Details of income tax expense for continuing operations including noncontrolling interests were as follows: Dominion Energy Virginia Power Dominion Energy Gas Year Ended December 31, 2019 2018 2017 2019 2018 2017 2019 2018 2017 (millions) Current: Federal $ 32 $ (45 ) $ (1 ) $ 286 $ 36 $ 432 $ 130 $ (227 ) $ 75 State 103 108 (26 ) 58 40 73 17 31 13 Total current expense (benefit) 135 63 (27 ) 344 76 505 147 (196 ) 88 Deferred: Federal 2017 Tax Reform Act impact (1) — 46 (851 ) — 21 (93 ) — (6 ) (246 ) Taxes before operating loss carryforwards, investment tax credits and tax reform 182 436 739 (128 ) 199 319 (36 ) 343 88 Tax utilization expense (benefit) of operating loss carryforwards 119 92 174 — — 4 — — — Investment tax credits (51 ) (56 ) (200 ) (34 ) (51 ) (23 ) — — — State (93 ) (1 ) 132 22 55 59 (10 ) (17 ) 5 Total deferred expense (benefit) 157 517 (6 ) (140 ) 224 266 (46 ) 320 (153 ) Investment tax credit-gross deferral 62 2 5 62 2 5 — — — Investment tax credit-amortization (3 ) (2 ) (2 ) (2 ) (2 ) (2 ) — — — Total income tax expense (benefit) $ 351 $ 580 $ (30 ) $ 264 $ 300 $ 774 $ 101 $ 124 $ (65 ) (1) The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.
Effective Income Tax	For continuing operations including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies’ effective income tax rate as follows: Dominion Energy Virginia Power Dominion Energy Gas Year Ended December 31, 2019 2018 2017 2019 2018 2017 2019 2018 2017 U.S. statutory rate 21.0 % 21.0 % 35.0 % 21.0 % 21.0 % 35.0 % 21.0 % 21.0 % 35.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 1.3 3.0 2.0 4.5 4.7 3.7 2.5 3.2 2.6 Investment tax credits (5.7 ) (1.9 ) (6.3 ) (2.9 ) (3.5 ) (0.8 ) — — — Production tax credits (1.1 ) (0.7 ) (0.7 ) (0.7 ) (0.7 ) (0.4 ) — — — Valuation allowances 0.1 0.3 0.2 — — — (0.2 ) — 0.3 Reversal of excess deferred income taxes (2.0 ) (2.0 ) — (3.1 ) (3.2 ) — (0.8 ) (0.6 ) — Federal legislative change — 1.5 (27.5 ) — 1.3 (4.0 ) — (0.5 ) (41.0 ) State legislative change — (0.6 ) — — — — — (2.0 ) (0.7 ) Write-off 10.9 — — — — — — — — Change in tax status (2.8 ) — — — — — (6.0 ) — — AFUDC—equity (1.8 ) (0.8 ) (1.4 ) — (0.5 ) (0.6 ) (0.5 ) (0.3 ) (0.9 ) Employee stock ownership plan deduction (0.7 ) (0.4 ) (0.6 ) — — — — — — Other, net 1.1 (0.9 ) (1.7 ) (0.2 ) (0.1 ) 0.6 (3.4 ) (1) (4.4 ) (1) (6.0 ) (1) Effective tax rate 20.3 % 18.5 % (1.0 )% 18.6 % 19.0 % 33.5 % 12.6 % 16.4 % (10.7 )% (1) Includes (3.2)%, (4.6)% and (6.7)% relating to the absence of tax on noncontrolling interest in 2019, 2018 and 2017, respectively.
Deferred income taxes components	The Companies’ deferred income taxes consist of the following: Dominion Energy Virginia Power Dominion Energy At December 31, 2019 2018 2019 2018 2019 2018 (millions) Deferred income taxes: Total deferred income tax assets $ 3,736 $ 2,748 $ 1,207 $ 1,054 $ 206 $ 296 Total deferred income tax liabilities 9,883 7,813 4,058 4,020 1,494 1,626 Total net deferred income tax liabilities $ 6,147 $ 5,065 $ 2,851 $2,966 $1,288 $ 1,330 Total deferred income taxes: Plant and equipment, primarily depreciation method and basis differences $ 6,616 $ 4,933 $ 3,359 $ 3,367 $ 742 $ 671 Excess deferred income taxes (1,306 ) (993 ) (672 ) (678 ) (149 ) (156 ) Unrecovered NND Project costs 553 — — — — — DESC rate refund (169 ) — — — — — Toshiba Settlement (219 ) — — — — — Nuclear decommissioning 909 815 290 273 — — Deferred state income taxes 863 626 302 284 199 203 Federal benefit of deferred state income taxes (184 ) (132 ) (63 ) (60 ) (42 ) (43 ) Deferred fuel, purchased energy and gas costs 30 60 1 59 — (1 ) Pension benefits 174 81 (153 ) (132 ) 154 134 Other postretirement benefits (37 ) (5 ) 62 55 (6 ) (3 ) Loss and credit carryforwards (1,832 ) (1,546 ) (280 ) (183 ) (1 ) (5 ) Valuation allowances 161 158 5 5 1 6 Partnership basis differences 823 1,135 — — 423 570 Other (235 ) (67 ) — (24 ) (33 ) (46 ) Total net deferred income tax liabilities $ 6,147 $ 5,065 $ 2,851 $2,966 $1,288 $ 1,330 Deferred Investment Tax Credits – Regulated Operations 130 51 111 51 — — Total Deferred Taxes and Deferred Investment Tax Credits $ 6,277 $ 5,116 $ 2,962 $3,017 $1,288 $ 1,330
Summary of deductible loss and credit carryforwards	At December 31, 2019, Dominion Energy had the following deductible loss and credit carryforwards: Deductible Deferred Valuation Expiration (millions) Federal losses $ 1,361 $ 286 $ — 2037 Federal investment credits — 922 — 2035-2039 Federal production credits — 126 — 2035-2039 Other federal credits — 40 — 2035-2038 State losses 3,074 173 (57 ) 2020-2038 State minimum tax credits — 165 — No expiration State investment and other credits — 144 (98 ) 2020-2031 Total $4,435 $ 1,856 $(155) At December 31, 2019, Virginia Power had the following deductible loss and credit carryforwards: Deductible Deferred Valuation Expiration (millions) Federal investment credits $ — $ 213 $ — 2035-2039 Federal production and other credits — 58 — 2035-2039 State investment credits — 9 (5 ) 2024 Total $ — $ 280 $ (5 )
Reconciliation of changes in unrecognized tax benefits	A reconciliation of changes in the Companies’ unrecognized tax benefits follows: Dominion Energy Virginia Power Dominion Energy 2019 2018 2017 2019 2018 2017 2019 2018 2017 (millions) Balance at January 1 $ 44 $ 38 $ 64 $ 2 $ 4 $ 13 $2 $ 2 $9 Acquired unrecognized tax benefits 129 (1) — — — — — — — — Increases-prior period positions — 10 1 — — — — — — Decreases-prior period positions — — (9 ) — — (1 ) — — — Increases-current period positions 9 10 5 — — — — — — Settlements with tax authorities (7 ) (6 ) (23 ) (2 ) (1 ) (8 ) — — (7 ) Expiration of statutes of limitations — (8 ) — — (1 ) — — — — Balance at December 31 $ 175 $ 44 $ 38 $ — $ 2 $ 4 $2 $ 2 $2 (1) Acquired unrecognized tax benefits reflect $106 million plus increases in prior period positions of $76 million and decreases in prior period positions of $53 million that were recorded through purchase accounting.
Earliest tax year remaining	For each of the major states in which Dominion Energy operates, the earliest tax year remaining open for examination is as follows: State Earliest Pennsylvania (1) 2012 Connecticut 2016 Virginia (2) 2016 West Virginia (1) 2016 New York (1) 2015 Utah 2016 South Carolina 2012

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Inputs, Assets, Quantitative Information	The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at December 31, 2019. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value Valuation Techniques Unobservable Input Range Weighted (1) Assets Physical and financial forwards: Natural gas (2) $ 13 Discounted cash flow Market price (per Dth) (3) (1) - — FTRs 6 Discounted cash flow Market price (per MWh) (3) (1) - 5 1 Total assets $ 19 Liabilities Physical and financial forwards: Natural gas (2) $ 43 Discounted cash flow Market price (per Dth) (3) (2) - 4 (1 ) FTRs 5 Discounted cash flow Market price (per MWh) (3) (4) - 4 — Physical options: Natural gas 8 Option model Market price (per Dth) (3) 1 - 4 3 Price volatility (4) 24% - 66% 37 % Total liabilities $ 56 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets.
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Position Change to Input Impact on Fair Market price Buy Increase (decrease) Gain (loss) Market price Sell Increase (decrease) Loss (gain) Price volatility Buy Increase (decrease) Gain (loss) Price volatility Sell Increase (decrease) Loss (gain)
Fair Value, by Balance Sheet Grouping	The following table presents Dominion Energy’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Derivatives: Commodity $ — $ 55 $ 19 $ 74 Interest rate — 11 — 11 Foreign currency — 8 — 8 Investments (1) Equity securities: U.S. 4,195 — — 4,195 Fixed income: Corporate debt instruments — 463 — 463 Government securities 473 719 — 1,192 Cash equivalents and other 19 1 — 20 Total assets $ 4,687 $ 1,257 $ 19 $ 5,963 Liabilities Derivatives: Commodity $ — $ 75 $ 56 $ 131 Interest rate — 606 — 606 Foreign currency — 3 — 3 Total liabilities $ — $ 684 $56 $ 740 December 31, 2018 Assets Derivatives: Commodity $ — $ 180 $ 70 $ 250 Interest rate — 18 — 18 Foreign currency — 26 — 26 Investments (1) Equity securities: U.S. 3,277 — — 3,277 Fixed income: Corporate debt instruments — 431 — 431 Government securities 455 688 — 1,143 Cash equivalents and other 11 — — 11 Total assets $ 3,743 $ 1,343 $ 70 $ 5,156 Liabilities Derivatives: Commodity $ — $ 129 $ 6 $ 135 Interest rate — 142 — 142 Foreign currency — 2 — 2 Total liabilities $ — $ 273 $ 6 $ 279 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $274 million and $220 million of assets at December 31, 2019 and 2018, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the net change in Dominion Energy’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category: 2019 2018 2017 (millions) Balance at January 1, $ 64 $ 150 $ 139 Total realized and unrealized gains (losses): Included in earnings: Operating Revenue (1 ) (2 ) 3 Electric fuel and other energy-related purchases (22 ) (15 ) (42 ) Purchased gas 2 — 1 Included in other comprehensive income (loss) — 1 (2 ) Included in regulatory assets/liabilities (90 ) (44 ) 42 Settlements 17 (27 ) 6 Purchases (10 ) — — Sales 6 — — Transfers out of Level 3 (3 ) 1 3 Balance at December 31, $ (37 ) $ 64 $ 150 The amount of total gains (losses) for the period included in earnings Operating Revenue $ — $ — $ 2
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	For the Companies’ financial instruments that are not recorded at fair value, the carrying amounts and estimated fair values are as follows: December 31, 2019 2018 Carrying Amount Estimated (1) Carrying Amount Estimated (1) (millions) Dominion Energy Long-term debt (2) $ 32,055 $36,155 $ 29,952 $31,045 Credit facility borrowings — — 73 73 Junior subordinated notes (3) 4,797 4,953 3,430 3,358 Remarketable subordinated notes (3) — — 1,386 1,340 Virginia Power Long-term debt (3) $ 12,326 $14,281 $ 11,671 $12,400 Dominion Energy Gas Long-term debt (4) $ 5,520 $5,738 $ 7,770 $7,803 Credit facility borrowings — — 73 73 (1) Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value. (2) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At December 31, 2019 and 2018, includes the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt of $4 million and $(20) million, respectively. (3) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium. (4) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.
Virginia Electric and Power Company
Fair Value Inputs, Assets, Quantitative Information	VIRGINIA POWER The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at December 31, 2019. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value Valuation Techniques Unobservable Input Range Weighted (1) Assets Physical and financial forwards: Natural gas (2) $ 13 Discounted cash flow Market price (per Dth) (3) (1) - — FTRs 6 Discounted cash flow Market price (per MWh) (3) (1) - 1 Total assets $ 19 Liabilities Physical and financial forwards: Natural gas (2) $ 43 Discounted cash flow Market price (per Dth) (3) (2) - (1 ) FTRs 5 Discounted cash flow Market price (per MWh) (3) (4) - — Physical options: Natural gas 8 Option model Market price (per Dth) (3) 1 - 4 3 Price volatility (4) 24%—66% 37 % Total liabilities $ 56 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets.
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Position Change to Input Impact on Fair Market price Buy Increase (decrease) Gain (loss) Market price Sell Increase (decrease) Loss (gain) Price volatility Buy Increase (decrease) Gain (loss) Price volatility Sell Increase (decrease) Loss (gain)
Fair Value, by Balance Sheet Grouping	The following table presents Virginia Power’s assets and liabilities that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Derivatives: Commodity $ — $ 3 $19 $ 22 Interest rate — 2 — 2 Investments (1) Equity securities: U.S. 1,920 — — 1,920 Fixed income: Corporate debt instruments — 256 — 256 Government securities 186 361 — 547 Cash equivalents and other — 1 — 1 Total assets $ 2,106 $623 $19 $ 2,748 Liabilities Derivatives: Commodity $ — $ 47 $56 $ 103 Interest rate — 363 — 363 Total liabilities $ — $410 $56 $ 466 December 31, 2018 Assets Derivatives: Commodity $ — $ 24 $66 $ 90 Interest rate — 3 — 3 Investments (1) Equity securities: U.S. 1,476 — — 1,476 Fixed income: Corporate debt instruments — 221 — 221 Government securities 164 343 — 507 Total assets $ 1,640 $591 $66 $ 2,297 Liabilities Derivatives: Commodity $ — $ 9 $ 6 $ 15 Interest rate — 88 — 88 Total liabilities $ — $ 97 $ 6 $ 103 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $159 million and $160 million of assets at December 31, 2019 and 2018, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the net change in Virginia Power’s assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category: 2019 2018 2017 (millions) Balance at January 1, $ 60 $ 147 $ 143 Total realized and unrealized gains (losses): Included in earnings: Electric fuel and other energy-related purchases (22 ) (17 ) (43 ) Included in regulatory assets/liabilities (88 ) (45 ) 40 Settlements 13 (25 ) 7 Balance at December 31, $ (37 ) $ 60 $ 147
Dominion Energy Gas Holdings, LLC
Fair Value, by Balance Sheet Grouping	The following table presents Dominion Energy Gas’ assets and liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions: Level 1 Level 2 Level 3 Total (millions) December 31, 2019 Assets Foreign currency $ — $8 $ — $8 Total assets $ — $8 $ — $8 Liabilities Interest rate $ — $83 $ — $83 Foreign currency — 3 — 3 Total liabilities $ — $86 $ — $86 December 31, 2018 Assets Commodity $ — $3 $ — $3 Interest rate — 2 — 2 Foreign currency — 26 — 26 Total assets $ — $31 $ — $31 Liabilities Interest rate $ — $17 $ — $17 Foreign currency — 2 — 2 Total liabilities $ — $ 19 $ — $ 19
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the net change in Dominion Energy Gas’ derivative assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category. There were no changes in assets and liabilities measure at fair value on a recurring basis and included in the Level 3 fair value category during the year ended December 31, 2019. 2018 2017 (millions) Balance at January 1, $(2 ) $(2 ) Total realized and unrealized gains (losses): Included in other comprehensive income (loss) 1 (3 ) Transfers out of Level 3 1 3 Balance at December 31, $— $(2 )

Derivatives and Hedge Account_2

Derivatives and Hedge Accounting Activities (Tables)	12 Months Ended
	Dec. 31, 2019
Offsetting Assets	The tables below present Dominion Energy’s derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset Gross Amounts Not Offset Gross Assets (1) Financial Cash Net Gross Assets (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $35 $21 $— $14 $175 $12 $— $163 Exchange 37 21 — 16 68 68 — — Interest rate contracts: Over-the-counter 11 3 — 8 18 1 — 17 Foreign currency contracts: Over-the-counter 8 8 — — 26 2 — 24 Total derivatives, subject to a master netting or similar arrangement $91 $53 $— $38 $287 $83 $— $204 (1) Excludes $2 million and $7 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.
Offsetting Liabilities	December 31, 2019 December 31, 2018 Gross Amounts Not Gross Amounts Not Gross Liabilities (1) Financial Cash Net Gross Liabilities (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $105 $21 $— $ 84 $ 19 $12 $— $ 7 Exchange 21 21 — — 115 68 47 — Interest rate contracts: Over-the-counter 606 8 35 563 142 1 — 141 Foreign currency contracts: Over-the-counter 3 3 — — 2 2 — — Total derivatives, subject to a master netting or similar arrangement $735 $53 $35 $647 $278 $83 $47 $148 (1) Excludes $5 million and $1 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.
Schedule of Volume of Derivative Activity	The following table presents the volume of Dominion Energy’s derivative activity as of December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 79 34 Basis 227 495 Electricity (MWh): Fixed price (1) 3,810,015 — FTRs 46,585,304 — Liquids (Gal) (2) 52,374,000 — Interest rate (3) $ 2,450,000,000 $ 3,976,014,497 Foreign currency (3) — € 250,000,000 € (1) Includes options. (2) Includes NGLs. (3) Maturity is determined based on final settlement period.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy’s Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected to be After-Tax Maximum Term (millions) Commodities: Gas $ (4 ) $ (4 ) 24 months Electricity 19 19 12 months Other 1 1 12 months Interest rate (426 ) (64 ) 384 months Foreign currency 3 (2 ) 78 months Total $ (407 ) $ (50 )
Schedule of Amounts Recorded on Balance Sheet Related to Cumulative Basis Adjustments for Fair Value Hedges	The following table presents the amounts recorded on the balance sheet related to cumulative basis adjustments for fair value hedges: Carrying Amount of the Hedged Asset (Liability) (1) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (2) December 31, December 31, December 31, December 31, (millions) Long-term $ (1,154 ) $ (1,631 ) $ (4 ) $20 (1) Includes $(397) million and $(892) million related to discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively. (2) Includes $3 million and $8 million of hedging adjustments on discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively.
Fair Value of Derivatives	The following tables present the fair values of Dominion Energy’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Fair Value – Total (millions) At December 31, 2019 ASSETS Current Assets Commodity $ 30 $37 $ 67 Interest rate 1 — 1 Total current derivative assets (1) 31 37 68 Noncurrent Assets Commodity 1 6 7 Interest rate 10 — 10 Foreign currency 8 — 8 Total noncurrent derivative assets (2) 19 6 25 Total derivative assets $ 50 $43 $ 93 LIABILITIES Current Liabilities Commodity $ 6 $77 $ 83 Interest rate 321 1 322 Foreign currency 3 — 3 Total current derivative liabilities (3) 330 78 408 Noncurrent Liabilities Commodity 1 47 48 Interest rate 267 17 284 Total noncurrent derivative liabilities (4) 268 64 332 Total derivative liabilities $598 $142 $ 740 At December 31, 2018 ASSETS Current Assets Commodity $ 55 $154 $ 209 Interest rate 14 — 14 Total current derivative assets (1) 69 154 223 Noncurrent Assets Commodity 6 35 41 Interest rate 4 — 4 Foreign currency 26 — 26 Total noncurrent derivative assets (2) 36 35 71 Total derivative assets $105 $189 $ 294 LIABILITIES Current Liabilities Commodity $ 17 $112 $ 129 Interest rate 26 — 26 Foreign currency 2 — 2 Total current derivative liabilities (3) 45 112 157 Noncurrent Liabilities Commodity 5 1 6 Interest rate 116 — 116 Total noncurrent derivative liabilities (4) 121 1 122 Total derivative liabilities $166 $113 $ 279 (1) Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets. (3) Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets. (4) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables present the gains and losses on Dominion Energy’s derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) (1) Amount of Gain (Loss) Increase (2) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Commodity: Operating revenue $146 Purchased gas (3 ) Total commodity $125 $143 $ — Interest rate (3) (252 ) (54 ) (255 ) Foreign currency (4) (18 ) (6 ) — Total $(145 ) $ 83 $(255 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Commodity: Operating revenue $(90 ) Electric fuel and other energy-related purchases 14 Total commodity $ 64 $(76 ) $ — Interest rate (3) (18 ) (48 ) 39 Foreign currency (4) (6 ) (13 ) — Total $ 40 $(137 ) $ 39 Year Ended December 31, 2017 Derivative type and location of gains (losses): Commodity: Operating revenue $ 81 Purchased gas (2 ) Total commodity $ 1 $ 79 $ — Interest rate (3) (8 ) (52 ) (58 ) Foreign currency (4) 18 20 — Total $ 11 $ 47 $ (58 ) (1) Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income. (3) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance	Derivatives not designated as hedging instruments Amount of Gain (Loss) Recognized in (1) Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ 45 $ (28 ) $ 18 Purchased gas (28 ) 11 (3 ) Electric fuel and other energy-related purchases (46 ) (9 ) (59 ) Other operations & maintenance — — (1 ) Interest rate 3 — — Total $ (26 ) $ (26 ) $ (45 ) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income.
Virginia Electric and Power Company
Offsetting Assets	The tables below present Virginia Power’s derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Gross Amounts Not Offset in the Gross Assets (1) Financial Cash Net Gross Assets (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $19 $18 $— $1 $64 $6 $— $58 Interest rate contracts: Over-the-counter 2 — — 2 3 — — 3 Total derivatives, subject to a master netting or similar arrangement $21 $18 $— $3 $67 $6 $— $61 (1) Excludes $3 million and $26 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.
Offsetting Liabilities	December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Gross Amounts Not Offset in the Gross Liabilities (1) Financial Cash Net Gross Liabilities (1) Financial Cash Net (millions) Commodity contracts: Over-the-counter $ 59 $18 $— $ 41 $ 6 $6 $— $— Interest rate contracts: Over-the-counter 363 — — 363 88 — — 88 Total derivatives, subject to a master netting or similar arrangement $422 $18 $— $404 $94 $6 $— $88 (1) Excludes $44 million and $9 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.
Schedule of Volume of Derivative Activity	The following table presents the volume of Virginia Power’s derivative activity at December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 41 9 Basis 132 448 Electricity (MWh): FTRs 46,585,304 — Interest rate (2) $ 900,000,000 $ 950,000,000 (1) Includes options. (2) Maturity is determined based on final settlement period.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to losses on cash flow hedges included in AOCI in Virginia Power’s Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected to be After-Tax Maximum (millions) Interest rate $ (34 ) $ (1 ) 384 months Total $ (34 ) $ (1 )
Fair Value of Derivatives	The following tables present the fair values of Virginia Power’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Fair Value – Total (millions) At December 31, 2019 ASSETS Current Assets Commodity $ — $ 20 $ 20 Total current derivative assets (1) — 20 20 Noncurrent Assets Commodity — 2 2 Interest rate 2 — 2 Total noncurrent derivative assets (2) 2 2 4 Total derivative assets $ 2 $ 22 $ 24 LIABILITIES Current Liabilities Commodity $ — $ 58 $ 58 Interest rate 185 — 185 Total current derivative liabilities 185 58 243 Noncurrent Liabilities Commodity — 45 45 Interest rate 178 — 178 Total noncurrent derivatives liabilities (3) 178 45 223 Total derivative liabilities $363 $103 $ 466 At December 31, 2018 ASSETS Current Assets Commodity $ — $ 60 $ 60 Interest rate 3 — 3 Total current derivative assets (1) 3 60 63 Noncurrent Assets Commodity — 30 30 Total noncurrent derivative assets (2) — 30 30 Total derivative assets $ 3 $ 90 $ 93 LIABILITIES Current Liabilities Commodity $ — $ 15 $ 15 Interest rate 10 — 10 Total current derivative liabilities 10 15 25 Noncurrent Liabilities Interest rate 78 — 78 Total noncurrent derivative liabilities (3) 78 — 78 Total derivative liabilities $ 88 $ 15 $ 103 (1) Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets. (3) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables present the gains and losses on Virginia Power’s derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging Amount of (1) Amount of Increase (2) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Interest rate (3) $(30 ) $(1 ) $(259 ) Total $(30 ) $(1 ) $(259 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Interest rate (3) $ 2 $(1 ) $ 39 Total $ 2 $(1 ) $ 39 Year Ended December 31, 2017 Derivative type and location of gains (losses): Interest rate (3) $ (8 ) $(1 ) $(58 ) Total $ (8 ) $(1 ) $(58 ) (1) Amounts deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (3) Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance	Derivatives not designated as hedging instruments Amount of Gain (Loss) (1) Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity (2) $ (45 ) $2 $(57) Total $ (45 ) $2 $(57) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.
Dominion Energy Gas Holdings, LLC
Offsetting Assets	The tables below present Dominion Energy Gas’ derivative asset and liability balances by type of financial instrument, if the gross amounts recognized in its Consolidated Balance Sheets were netted with derivative instruments and cash collateral received or paid: December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Not Offset in the Consolidated Gross Assets Financial Cash Net Amounts Gross Assets Financial Cash Net (millions) Commodity contracts: Over-the-counter $ — $ — $ — $ — $ 3 $ — $ — $ 3 Interest rate contracts: Over-the-counter — — — — 2 — — 2 Foreign currency contracts: Over-the-counter 8 8 — — 26 2 — 24 Total derivatives, subject to a master netting or similar arrangement $ 8 $ 8 $ — $ — $ 31 $ 2 $ — $ 29
Offsetting Liabilities	December 31, 2019 December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Not Offset in the Consolidated Gross Liabilities Financial Cash Net Gross Liabilities Financial Cash Net (millions) Interest rate contracts: Over-the-counter $ 83 $ 5 $ — $ 78 $ 17 $ — $ — $ 17 Foreign currency contracts: Over-the-counter 3 3 — — 2 2 — — Total derivatives, subject to a master netting or similar arrangement $ 86 $ 8 $ — $ 78 $ 19 $ 2 $ — $ 17
Schedule of Volume of Derivative Activity	The following table presents the volume of Dominion Energy Gas’ derivative activity at December 31, 2019. These volumes are based on open derivative positions and represent the combined absolute value of their long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of their long and short positions. Current Noncurrent Interest rate (1) $ 250,000,000 $ 1,050,000,000 Foreign currency (1) € — € 250,000,000 (1) Maturity is determined based on final settlement period.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019: AOCI After-Tax Amounts Expected After-Tax Maximum Term (millions) Interest rate $(84 ) $ 15 300 months Foreign currency 3 (2 ) 78 months Total $(81 ) $ 13
Fair Value of Derivatives	The following table presents the fair values of Dominion Energy Gas’ derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – under Fair Value – not under Total (millions) At December 31, 2019 ASSETS Noncurrent Assets Foreign currency $ 8 $ — $ 8 Total noncurrent derivative assets (1) 8 — 8 Total derivative assets $ 8 $ — $ 8 LIABILITIES Current Liabilities Interest rate $30 $ — $ 30 Foreign currency 3 — 3 Total current derivative liabilities (2) 33 — 33 Noncurrent Liabilities Interest rate 53 — 53 Total noncurrent derivative (3) 53 — 53 Total derivative liabilities $86 $ — $ 86 At December 31, 2018 ASSETS Current Assets Commodity $ 3 $ — $ 3 Interest rate 2 — 2 Total current derivative assets (4) 5 — 5 Noncurrent Assets Foreign currency 26 — 26 Total noncurrent derivative assets (1) 26 — 26 Total derivative assets $31 $ — $ 31 LIABILITIES Current Liabilities Interest rate $ 9 $ — $ 9 Foreign currency 2 — 2 Total current derivative liabilities (2) 11 — 11 Noncurrent Liabilities Interest rate 8 — 8 Total noncurrent derivative (3) 8 — 8 Total derivative liabilities $19 $ — $ 19 (1) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets. (2) Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets . (3) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. (4) Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables present the gains and losses on Dominion Energy Gas’ derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives Portion) (1) Amount of Gain (Loss) (millions) Year Ended December 31, 2019 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ 4 Total commodity $ 1 $ 4 Interest rate (2) (68 ) (5 ) Foreign currency (3) (18 ) (6 ) Total $ (85 ) $ (7 ) Year Ended December 31, 2018 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ (8 ) Total commodity $ 1 $ (8 ) Interest rate (2) (16 ) (5 ) Foreign currency (3) (6 ) (13 ) Total $ (21 ) $ (26 ) Year Ended December 31, 2017 Derivative type and location of gains (losses): Commodity: Net income from discontinued operations $ (8 ) Total commodity $ (10 ) $ (8 ) Interest rate (2) 1 (6 ) Foreign currency (3) 18 20 Total $ 9 $ 6 (1) Amounts deferred into AOCI have no associated effect in Dominion Energy Gas’ Consolidated Statements of Income. (2) Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges. (3) Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in other income.
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance	Derivatives not designated as hedging Amount of Gain (Loss) Recognized in Income on Derivatives Year Ended December 31, 2019 2018 2017 (millions) Derivative type and location of gains (losses): Commodity Operating revenue $— $(11 ) $— Total $— $(11 ) $—

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share Computation	The following table presents the calculation of Dominion Energy’s basic and diluted EPS: 2019 2018 2017 (millions, except EPS) Net income attributable to Dominion Energy $ 1,358 $ 2,447 $ 2,999 Preferred stock dividends (see Note 19) (17 ) — — Net income attributable to Dominion Energy – Basic 1,341 2,447 2,999 Dilutive effect of Series A Preferred Stock (28 ) — — Net income attributable to Dominion Energy – Diluted 1,313 2,447 2,999 Average shares of common stock outstanding – Basic 808.8 654.2 636.0 Net effect of dilutive securities (1) 0.1 0.7 — Average shares of common stock outstanding – Diluted 808.9 654.9 636.0 Earnings Per Common Share – Basic $ 1.66 $ 3.74 $ 4.72 Earnings Per Common Share – Diluted $ 1.62 $ 3.74 $ 4.72 (1) Dilutive securities for 2018 consist primarily of forward sale agreements, effective April 2018 to December 2018. See Notes 17 and 19 for more information.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds	Dominion Energy’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) December 31, 2019 Equity securities: (1) U.S. $ 1,807 $ 2,451 $ (20 ) $ 4,238 Fixed income securities: (2) Corporate debt instruments 434 29 — 463 Government securities 1,108 39 (2 ) 1,145 Common/collective trust funds 115 4 — 119 Insurance contracts 214 — — 214 Cash equivalents and other (3) 13 — — 13 Total $ 3,691 $ 2,523 $ (22 ) (4) $ 6,192 December 31, 2018 Equity securities: (1) U.S. $1,741 $1,640 $(51) $3,330 Fixed income securities: (2) Corporate debt instruments 435 5 (9) 431 Government securities 1,092 17 (12) 1,097 Common/collective trust funds 76 — — 76 Cash equivalents and other 4 — — 4 Total $3,348 $1,662 $(72) (4) $4,938 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (3) Includes pending purchases of securities of $1 million at December 31, 2019. (4) The fair value of securities in an unrealized loss position was $298 million and $833 million at December 31, 2019 and 2018, respectively.
Unrealized Gain Loss on Equity	The portion of unrealized gains and losses that relates to equity securities held within Dominion Energy’s nuclear decommissioning trusts is summarized below: Year Ended December 31, 2019 2018 (millions) Net gains (losses) recognized during the period $ 919 $ (245 ) Less: Net gains recognized during the period on securities sold during the period (80 ) (58 ) Unrealized gains (losses) recognized during the period on securities still held at December 31, 2019 and 2018 (1) $ 839 $ (303 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Investments Classified by Contractual Maturity Date	The fair value of Dominion Energy’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at December 31, 2019 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 198 Due after one year through five years 412 Due after five years through ten years 390 Due after ten years 727 Total $ 1,727
Marketable Securities	Presented below is selected information regarding Dominion Energy’s equity and fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds. Year Ended December 31, 2019 2018 2017 (millions) Proceeds from sales $ 1,712 $ 1,804 $ 1,831 Realized gains (1) 195 140 166 Realized losses (1) 96 91 71 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Other-Than-Temporary Impairment Losses	Dominion Energy recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows: Year Ended December 31, 2019 2018 2017 (millions) Total other-than-temporary impairment losses (1) $ 3 $ 30 $ 44 Losses recorded to the nuclear decommissioning trust regulatory liability — — (16 ) Losses recognized in other comprehensive income (before taxes) (3 ) (30 ) (5 ) Net impairment losses recognized in earnings $ — $ — $ 23 (1) Amounts include other-than-temporary impairment losses for fixed income securities of $5 million at December 31, 2017.
Investments Accounts Under Equity Method of Accounting	Investments that Dominion Energy account for under the equity method of accounting are as follows: Company Ownership% Investment Balance Description As of December 31, 2019 2018 (millions) Atlantic Coast Pipeline 48 % $ 1,123 $ 820 Gas transmission system Iroquois 50 % 276 302 Gas transmission system Fowler Ridge 50 % 74 82 Wind-powered merchant generation facility Wrangler 20 % 77 — Nonregulated retail energy marketing Other (1)(2) various 96 74 Total $ 1,646 $ 1,278 (1) Liability of less than $1 million associated with NedPower recorded to other deferred credits and other liabilities, on the Consolidated Balance Sheets as of December 31, 2018. See additional discussion of NedPower below. (2) Dominion Energy has an $ 80 2
Virginia Electric and Power Company
Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds	Virginia Power’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair (millions) December 31, 2019 Equity securities: (1) U.S. $894 $1,144 $(11) $2,027 Fixed income securities: (2) Corporate debt instruments 241 15 — 256 Government securities 534 14 (2) 546 Common/collective trust funds 51 — — 51 Cash equivalents and other 1 — — 1 Total $1,721 $1,173 $(13) (4) $2,881 December 31, 2018 Equity securities: (1) U.S. $ 858 $751 $(24) $1,585 Fixed income securities: (2) Corporate debt instruments 224 2 (5) 221 Government securities 504 7 (5) 506 Common/collective trust funds 51 — — 51 Cash equivalents and other (3) 6 — — 6 Total $1,643 $760 $(34) (4) $2,369 (1) Unrealized gains and losses on equity securities, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (3) Includes pending sales of securities of $6 million at December 31, 2018. (4) The fair value of securities in an unrealized loss position was $185 million and $404 million at December 31, 2019 and 2018, respectively.
Unrealized Gain Loss on Equity	The portion of unrealized gains and losses that relates to equity securities held within Virginia Power’s nuclear decommissioning trusts is summarized below: Year Ended December 31, 2019 2018 (millions) Net gains (losses) recognized during the period $ 423 $ (105 ) Less: Net gains recognized during the period on securities sold during the period (20 ) (32 ) Unrealized gains (losses) recognized during the period on securities still held at December 31, 2019 and 2018 (1) $ 403 $ (137 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Investments Classified by Contractual Maturity Date	The fair value of Virginia Power’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at December 31, 2019, by contractual maturity is as follows: Amount (millions) Due in one year or less $ 91 Due after one year through five years 175 Due after five years through ten years 206 Due after ten years 381 Total $853
Marketable Securities	Presented below is selected information regarding Virginia Power’s equity and fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds. Year Ended December 31, 2019 2018 2017 (millions) Proceeds from sales $ 858 $ 887 $ 849 Realized gains (1) 58 60 75 Realized losses (1) 22 27 30 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Other-Than-Temporary Impairment Losses	Virginia Power recorded other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds as follows: Year Ended December 31, 2019 2018 2017 (millions) Total other-than-temporary impairment losses (1) $ 2 $ 15 $ 20 Losses recorded to the nuclear decommissioning trust regulatory liability — — (16 ) Losses recognized in other comprehensive income (before taxes) (2 ) (15 ) (2 ) Net impairment losses recognized in earnings $ — $ — $ 2 (1) Amounts include other-than-temporary impairment losses for fixed income securities of $2 million at December 31, 2017.
Dominion Energy Gas Holdings, LLC
Investments Accounts Under Equity Method of Accounting	Investments that Dominion Energy Gas account for under the equity method of accounting are as follows: Company Ownership% Investment Description As of December 31, 2019 2018 (millions) Iroquois 50 % $276 $302 Gas transmission system White River Hub 50 % 36 37 Gas transmission system Total $312 $339
Dominion Energy Gas Holdings, LLC | Iroquois
Investments Accounts Under Equity Method of Accounting	Summarized financial information provided to Dominion Energy Gas by Iroquois for 100% of Iroquois at December 31, 2019 and 2018 , , At December 31, 2019 At December 31, 2018 (millions) Current assets $ 79 $ 112 Noncurrent assets 586 588 Current liabilities 37 165 Noncurrent liabilities 334 193 Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 (millions) Revenues $180 $194 $194 Operating income 93 108 110 Net income 82 94 93
Dominion Energy Gas Holdings, LLC | White River Hub LLC
Investments Accounts Under Equity Method of Accounting	Summarized financial information provided to Dominion Energy Gas by White River Hub for 100% of White River Hub at December 31, 2019 and 2018 and for the years ended December 31, 2019, 2018 and 2017 is presented below. At December 31, 2019 At December 31, 2018 (millions) Current assets $ 3 $ 3 Noncurrent assets 39 41 Current liabilities 2 2 Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 (millions) Revenues $10 $12 $10 Operating income 6 8 7 Net income 6 8 7

Property Plant And Equipment (T

Property Plant And Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment	Major classes of property, plant and equipment and their respective balances for the Companies are as follows: At December 31, 2019 2018 (millions) Dominion Energy Utility: Generation $ 25,317 $ 18,896 Transmission 20,486 16,666 Distribution 25,748 18,535 Storage 3,227 2,906 Nuclear fuel 2,296 1,626 Oil and gas 1,792 1,763 General and other 2,413 1,783 Plant under construction 2,956 2,348 Total utility 84,235 64,523 Non-jurisdictional—including plant under construction 854 407 Nonutility: Merchant generation-nuclear 1,652 1,550 Merchant generation-other 3,985 3,802 Nuclear fuel 930 1,025 Gas gathering and processing 190 185 LNG facility 4,425 3,977 Other—including plant under construction 1,195 1,109 Total nonutility 12,377 11,648 Total property, plant and equipment $ 97,466 $ 76,578 Virginia Power Utility: Generation $ 19,552 $ 18,896 Transmission 10,229 9,391 Distribution 12,095 11,771 Nuclear fuel 1,688 1,626 General and other 825 820 Plant under construction 1,784 1,602 Total utility 46,173 44,106 Non-jurisdictional—including plant under construction 854 407 Other 11 11 Total property, plant and equipment $ 47,038 $ 44,524 Dominion Energy Gas Utility: Transmission $ 7,014 $ 6,790 Storage 2,799 2,615 General and other 219 210 Plant under construction 574 732 Total utility 10,606 10,347 Nonutility: LNG facility 4,425 3,977 Other—including plant under construction 135 376 Total nonutility 4,560 4,353 Total property, plant and equipment $ 15,166 $ 14,700
Schedule of Jointly Owned Utility Plants	Dominion Energy and Virginia Power’s proportionate share of jointly-owned power stations at December 31, 2019 is as follows Bath (1) North (1) Clover (1) Millstone (2) Summer (2) (millions, except Ownership interest 60 % 88.4 % 50 % 93.5 % 66.7 % Plant in service 1,058 2,564 610 1,267 1,394 Accumulated depreciation (661 ) (1,321 ) (247 ) (449 ) (659 ) Nuclear fuel — 793 — 483 608 Accumulated amortization of nuclear fuel — (634 ) — (390 ) (389 ) Plant under construction 7 143 5 87 77 (1) Units jointly owned by Virginia Power. (2) Unit jointly owned by Dominion Energy.
Dominion Energy And Virginia Electric And Power Company
Schedule of Business Acquisitions, by Acquisition	The following table presents acquisitions by Virginia Power of solar projects. Virginia Power has claimed or expects to claim federal investment tax credits on the projects. Date Agreement Entered Date Agreement Closed Project Location Project Name Project Cost (millions) (1) Date of Commercial Operations MW Capacity September 2017 October 2018 North Carolina Pecan $140 December 2018 75 September 2017 June 2019 North Carolina Gutenberg 142 September 2019 80 June 2018 February 2019 Virginia Gloucester 37 April 2019 20 August 2018 May 2019 Virginia Grasshopper 130 Expected 2020 80 August 2018 May 2019 North Carolina Chestnut 130 Expected 2020 75 June 2019 June 2019 Virginia Ft. Powhatan 270 Expected 2021 150 June 2019 August 2019 Virginia Belcher 160 Expected 2020 88 August 2019 November 2019 Virginia Bedford 110 Expected 2021 70 October 2019 October 2019 Virginia Maplewood 190 Expected 2022 120 December 2019 January 2020 Virginia Rochambeau 35 Expected 2021 20 (1) Includes acquisition costs.
Dominion Energy
Schedule of Business Acquisitions, by Acquisition	The following table presents acquisitions by Dominion Energy of solar projects. Dominion Energy expects to claim federal investment tax credits on the projects. Date Agreement Entered Date Agreement Closed Project Location Project Project Cost (millions) (1) Date of Commercial Operations MW Capacity August 2019 August 2019 Virginia Greensville $130 Expected 2020 80 August 2019 August 2019 Virginia Myrtle 35 Expected 2020 15 September 2019 September 2019 South Carolina Seabrook 103 December 2019 72 November 2019 November 2019 North Carolina Wilkinson 153 December 2019 74 (1) Includes acquisition costs.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Segment allocation of goodwill	The changes in Dominion Energy’s and Dominion Energy Gas’ carrying amount and segment allocation of goodwill are presented below: Dominion Gas Gas Dominion Contracted Corporate Total (millions) Dominion Energy Balance at December 31, 2017 (1) $ 2,106 $ 1,561 $ 2,496 $ — $ 242 $— $ 6,405 Purchase Accounting Adjustment — 4 1 — — — 5 Balance at December 31, 2018 (1) $ 2,106 $ 1,565 $ 2,497 $ — $ 242 $— $ 6,410 SCANA Combination (2) — 73 1,015 1,521 — — 2,609 Contribution of SEMI to Wrangler (3) — (73 ) — — — — (73 ) Balance at December 31, 2019 (1) $ 2,106 $ 1,565 $ 3,512 $ 1,521 $ 242 $— $ 8,946 Dominion Energy Gas Balance at December 31, 2017 (1) $ — $ 1,466 $ — $ — $ — $— $ 1,466 Purchase Accounting Adjustment — 5 — — — — 5 Balance at December 31, 2018 (1) $ — $ 1,471 $ — $ — $ — $— $ 1,471 No events affecting goodwill — — — — — — — Balance at December 31, 2019 (1) $ — $ 1,471 $ — $ — $ — $— $ 1,471 (1) Goodwill amounts do not contain any accumulated impairment losses. (2) See Note 3 for discussion of Dominion Energy’s acquisitions. (3) See Note 9 for additional information.
Components of intangible assets	The components of intangible assets are as follows: 2019 2018 At December 31, Gross Accumulated Gross Accumulated (millions) Dominion Energy Software, licenses and other $ 1,340 $549 $ 1,033 $363 Virginia Power Software, licenses and other $ 406 $135 $ 384 $134 Dominion Energy Gas Software, licenses and other $ 178 $ 72 $ 179 $ 64
Annual amortization expense of intangible assets	Annual amortization expense for these intangible assets is estimated to be as follows: 2020 2021 2022 2023 2024 (millions) Dominion Energy $ 88 $ 78 $ 70 $ 56 $ 49 Virginia Power $ 25 $ 19 $ 15 $ 8 $ 6 Dominion Energy Gas $ 9 $ 8 $ 8 $ 5 $ 4

Regulatory Assets and Liabili_2

Regulatory Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Regulated Operations [Abstract]
Schedule of Regulatory Assets	Regulatory assets and liabilities include the following: At December 31, 2019 2018 (millions) Dominion Energy Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred project costs and DSM programs for gas utilities (2) 21 17 Unrecovered gas costs (3) 102 14 Deferred rate adjustment clause costs for Virginia electric utility (4)(5) 109 78 Deferred nuclear refueling outage costs (6) 68 69 NND Project costs (7) 138 — PJM transmission rates (8) 121 45 Other 272 99 Regulatory assets-current 879 496 Deferred cost of fuel used in electric generation (1) — 83 P (9) 1,431 1,497 Deferred rate adjustment clause costs for Virginia electric utility (4)(5)(10) 235 230 PJM transmission rates (8) 85 192 Deferred project costs for gas utilities (2) 521 335 Interest rate hedges (11) 741 184 AROs and related funding (12) 311 — Cost of reacquired debt (13)(14) 262 3 NND Project costs (7) 2,503 — Ash pond and landfill closure costs (15) 1,016 27 Other 582 125 Regulatory assets-noncurrent 7,687 2,676 Total regulatory assets $ 8,566 $ 3,172 Regulatory liabilities: Provision for future cost of removal and AROs (16) $ 142 $ 117 Reserve for refunds and rate credits to electric utility customers (17) 143 71 Cost-of-service (18) 4 104 Income taxes refundable through future rates (19) 77 — Monetization of guarantee settlement (20) 67 — Other 64 64 Regulatory liabilities-current 497 356 Income taxes refundable through future rates (19) 5,088 4,071 Provision for future cost of removal and AROs (16) 2,302 1,409 Nuclear decommissioning trust (21) 1,471 1,070 Monetization of guarantee settlement (20) 970 — Reserve for refunds and rate credits to electric utility customers (17) 656 — Overrecovered other postretirement benefit costs (22) 189 120 Other 325 170 Regulatory liabilities-noncurrent 11,001 6,840 Total regulatory liabilities $ 11,498 $ 7,196 (1) Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations. (2) Primarily reflects amounts expected to be collected from or owed to gas customers in Dominion Energy’s service territories associated with current and prospective rider projects, including CEP, PIR and pipeline integrity management. See Note 13 for more information. (3) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (4) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (5) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (6) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (7) Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year (8) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (9) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries. (10) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (11) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 27 years as of December 31, 2019. (12) Represents deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 (13) Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be (14) During 2019, DESC purchased certain of its first mortgage bonds as discussed in Note 18. As a result of these transactions, DESC incurred net costs, including write-offs of unamortized discount, premium and debt issuance costs, of $270 million. (15) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCRs to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (16) Rates charged to customers by Dominion Energy’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (17) Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year one-time (18) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at the Companies’ regulated electric generation and electric and natural gas distribution operations. See Notes 3 and 13 for additional information. (19) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (20) Reflects amounts to be refunded to DESC electric service customers over a 20-year (21) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs. (22) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. At December 31, 2019 2018 (millions) Virginia Power Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred rate adjustment clause costs (2)(3) 109 78 Deferred nuclear refueling outage costs (4) 68 69 PJM transmission rates (5) 121 45 Other 87 58 Regulatory assets-current 433 424 Deferred rate adjustment clause costs (2)(3)(6) 235 230 PJM transmission rates (5) 85 192 Interest rate hedges (7) 404 151 Deferred cost of fuel used in electric generation (1) — 83 Ash pond and landfill closure costs (8) 1,016 27 Other 123 54 Regulatory assets-noncurrent 1,863 737 Total regulatory assets $ 2,296 $ 1,161 Regulatory liabilities: Provision for future cost of removal (9) $ 103 $ 92 Cost-of-service (10) — 95 Reserve for rate credits to electric utility customers (11`) — 71 Income taxes refundable through future rates (12) 54 — Other 10 41 Regulatory liabilities-current 167 299 Income taxes refundable through future rates (12) 2,438 2,579 Nuclear decommissioning trust (13) 1,471 1,070 Provision for future cost of removal (9) 1,054 940 Other 111 58 Regulatory liabilities-noncurrent 5,074 4,647 Total regulatory liabilities $ 5,241 $ 4,946 (1) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations. (2) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (3) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (4) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (5) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (6) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (7) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 24 years as of December 31, 2019. (8) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (9) Rates charged to customers by Virginia Power’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (10) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at regulated electric generation and distribution operations. See Note 13 for additional information. (11) Charge associated with Virginia legislation enacted in March 2018 that required one-time (12) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (13) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs. At December 31, 2019 2018 (millions) Dominion Energy Gas Regulatory assets: Unrecovered gas costs (1) $ 2 $ 1 Other 6 7 Regulatory assets-current (2) 8 8 Unrecognized pension and other postretirement benefit costs (3) — 15 Interest rate hedges (4) 32 33 Other 8 4 Regulatory assets-noncurrent 40 52 Total regulatory assets $ 48 $ 60 Regulatory liabilities: Provision for future cost of removal and AROs (5) $ 18 $ 9 Overrecovered gas costs (1) 8 7 Other 15 8 Regulatory liabilities-current (6) 41 24 Income taxes refundable through future rates (7) 560 530 Provision for future cost of removal and AROs (6) 95 113 Overrecovered other postretirement benefit costs (8) 133 106 Other 12 16 Regulatory liabilities-noncurrent 800 765 Total regulatory liabilities $ 841 $ 789 (1) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (2) Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets. (3) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy Gas’ rate-regulated subsidiaries. (4) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted average useful life of approximately 30 years. (5) Rates charged to customers by Dominion Energy Gas’ regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (6) Current regulatory liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. (7) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (8) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.
Schedule of Regulatory Liabilities	Regulatory assets and liabilities include the following: At December 31, 2019 2018 (millions) Dominion Energy Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred project costs and DSM programs for gas utilities (2) 21 17 Unrecovered gas costs (3) 102 14 Deferred rate adjustment clause costs for Virginia electric utility (4)(5) 109 78 Deferred nuclear refueling outage costs (6) 68 69 NND Project costs (7) 138 — PJM transmission rates (8) 121 45 Other 272 99 Regulatory assets-current 879 496 Deferred cost of fuel used in electric generation (1) — 83 P (9) 1,431 1,497 Deferred rate adjustment clause costs for Virginia electric utility (4)(5)(10) 235 230 PJM transmission rates (8) 85 192 Deferred project costs for gas utilities (2) 521 335 Interest rate hedges (11) 741 184 AROs and related funding (12) 311 — Cost of reacquired debt (13)(14) 262 3 NND Project costs (7) 2,503 — Ash pond and landfill closure costs (15) 1,016 27 Other 582 125 Regulatory assets-noncurrent 7,687 2,676 Total regulatory assets $ 8,566 $ 3,172 Regulatory liabilities: Provision for future cost of removal and AROs (16) $ 142 $ 117 Reserve for refunds and rate credits to electric utility customers (17) 143 71 Cost-of-service (18) 4 104 Income taxes refundable through future rates (19) 77 — Monetization of guarantee settlement (20) 67 — Other 64 64 Regulatory liabilities-current 497 356 Income taxes refundable through future rates (19) 5,088 4,071 Provision for future cost of removal and AROs (16) 2,302 1,409 Nuclear decommissioning trust (21) 1,471 1,070 Monetization of guarantee settlement (20) 970 — Reserve for refunds and rate credits to electric utility customers (17) 656 — Overrecovered other postretirement benefit costs (22) 189 120 Other 325 170 Regulatory liabilities-noncurrent 11,001 6,840 Total regulatory liabilities $ 11,498 $ 7,196 (1) Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations. (2) Primarily reflects amounts expected to be collected from or owed to gas customers in Dominion Energy’s service territories associated with current and prospective rider projects, including CEP, PIR and pipeline integrity management. See Note 13 for more information. (3) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (4) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (5) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (6) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (7) Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year (8) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (9) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries. (10) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (11) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 27 years as of December 31, 2019. (12) Represents deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 (13) Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be (14) During 2019, DESC purchased certain of its first mortgage bonds as discussed in Note 18. As a result of these transactions, DESC incurred net costs, including write-offs of unamortized discount, premium and debt issuance costs, of $270 million. (15) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCRs to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (16) Rates charged to customers by Dominion Energy’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (17) Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year one-time (18) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at the Companies’ regulated electric generation and electric and natural gas distribution operations. See Notes 3 and 13 for additional information. (19) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (20) Reflects amounts to be refunded to DESC electric service customers over a 20-year (21) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs. (22) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. At December 31, 2019 2018 (millions) Virginia Power Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 48 $ 174 Deferred rate adjustment clause costs (2)(3) 109 78 Deferred nuclear refueling outage costs (4) 68 69 PJM transmission rates (5) 121 45 Other 87 58 Regulatory assets-current 433 424 Deferred rate adjustment clause costs (2)(3)(6) 235 230 PJM transmission rates (5) 85 192 Interest rate hedges (7) 404 151 Deferred cost of fuel used in electric generation (1) — 83 Ash pond and landfill closure costs (8) 1,016 27 Other 123 54 Regulatory assets-noncurrent 1,863 737 Total regulatory assets $ 2,296 $ 1,161 Regulatory liabilities: Provision for future cost of removal (9) $ 103 $ 92 Cost-of-service (10) — 95 Reserve for rate credits to electric utility customers (11`) — 71 Income taxes refundable through future rates (12) 54 — Other 10 41 Regulatory liabilities-current 167 299 Income taxes refundable through future rates (12) 2,438 2,579 Nuclear decommissioning trust (13) 1,471 1,070 Provision for future cost of removal (9) 1,054 940 Other 111 58 Regulatory liabilities-noncurrent 5,074 4,647 Total regulatory liabilities $ 5,241 $ 4,946 (1) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations. (2) Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information. (3) As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) (4) Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months. (5) Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year (6) During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) write-off (7) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 24 years as of December 31, 2019. (8) Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information. (9) Rates charged to customers by Virginia Power’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (10) Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at regulated electric generation and distribution operations. See Note 13 for additional information. (11) Charge associated with Virginia legislation enacted in March 2018 that required one-time (12) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (13) Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs. At December 31, 2019 2018 (millions) Dominion Energy Gas Regulatory assets: Unrecovered gas costs (1) $ 2 $ 1 Other 6 7 Regulatory assets-current (2) 8 8 Unrecognized pension and other postretirement benefit costs (3) — 15 Interest rate hedges (4) 32 33 Other 8 4 Regulatory assets-noncurrent 40 52 Total regulatory assets $ 48 $ 60 Regulatory liabilities: Provision for future cost of removal and AROs (5) $ 18 $ 9 Overrecovered gas costs (1) 8 7 Other 15 8 Regulatory liabilities-current (6) 41 24 Income taxes refundable through future rates (7) 560 530 Provision for future cost of removal and AROs (6) 95 113 Overrecovered other postretirement benefit costs (8) 133 106 Other 12 16 Regulatory liabilities-noncurrent 800 765 Total regulatory liabilities $ 841 $ 789 (1) Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority. (2) Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets. (3) Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy Gas’ rate-regulated subsidiaries. (4) Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted average useful life of approximately 30 years. (5) Rates charged to customers by Dominion Energy Gas’ regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. (6) Current regulatory liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets. (7) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity. (8) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Summary of Additional Significant Riders Associated with Virginia Power Projects	• Additional significant riders associated with various Virginia Power projects are as follows: Rider Name Application Approval Date Rate Year Beginning Total Increase Rider S May 2019 February 2020 April 2020 $195 $(20 ) Rider GV May 2019 February 2020 April 2020 132 12 Rider W May 2019 February 2020 April 2020 106 1 Rider R May 2019 February 2020 April 2020 44 (13 ) Rider B May 2019 February 2020 April 2020 32 (6 ) Rider US-3 July 2019 Pending June 2020 31 21 Rider BW October 2019 Pending September 2020 120 1 Rider US-2 October 2019 Pending September 2020 10 (5 ) Rider E January 2020 Pending November 2020 88 (16 )
Summary of Additional Significant Virginia Power Electric Transmission Projects Approved and Applied	Additional significant Virginia Power electric transmission projects approved or Description and Location of Project Application Date Approval Date Type of Line Miles Lines Cost (millions) Rebuild and operate transmission line between Lanexa and the Northern Neck June 2018 February 2019 230 kV 3 $ 30 Build a new substation and connect three existing October 2018 June 2019 230 kV <1 30 Rebuild and operate the Glebe March 2019 September 2019 230 kV <1 125 Rebuild and operate transmission line between Valley, Virginia and April 2019 November 2019 500 kV 65 290 Rebuild and operate transmission line between the Suffolk substation and May 2019 November 2019 230 kV 11 20 Rebuild and operate five segments between the Loudoun August 2019 Pending 230 kV 19 70 Build new Evergreen Mills switching station and line loops in Loudoun County, December 2019 Pending 230 kV 2 30 Build new Lockridge substation and line loop in Loudoun County, Virginia December 2019 Pending 230 kV <1 35

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]
Changes to Asset Retirement Obligations	The changes to AROs during 2018 and 2019 were as follows: Amount (millions) Dominion Energy AROs at December 31, 2017 $ 2,432 Obligations incurred during the period 20 Obligations settled during the period (159 ) Revisions in estimated cash flows (2) 120 Accretion 119 AROs at December 31, 2018 (1) $ 2,532 Obligations incurred during the period (2) 2,413 Obligations settled during the period (137 ) AROs acquired in the SCANA Combination 577 Revisions in estimated cash flows (3) (324 ) Accretion 213 AROs at December 31, 2019 (1) $ 5,274 Virginia Power AROs at December 31, 2017 $ 1,365 Obligations incurred during the period 14 Obligations settled during the period (119 ) Revisions in estimated cash flows (2) 120 Accretion 65 AROs at December 31, 2018 $ 1,445 Obligations incurred during the period ( 2 ) 2,408 Obligations settled during the period (81 ) Revisions in estimated cash flows (3) (323 ) Accretion 132 AROs at December 31, 2019 $ 3,581 Dominion Energy Gas AROs at December 31, 2017 $ 85 Obligations incurred during the period 3 Obligations settled during the period (6 ) Accretion 6 AROs at December 31, 2018 ( 4 ) $ 88 Obligations settled during the period (3 ) Accretion 4 AROs at December 31, 2019 ( 4 ) $ 89 (1) Includes $282 million and $408 million reported in other current liabilities at December 31, 2018, and 2019, respectively. (2) Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information. (3) Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities as well as revisions for 20 year license extensions for regulated nuclear power stations in Virginia. (4) Includes $74 million and $75 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and 2019, respectively.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lease Assets and Liabilities Recorded in Consolidated Balance Sheets	At December 31, 2019, the Companies had the following lease assets and liabilities recorded in the Consolidated Balance Sheets: December 31, 2019 (millions) Dominion Energy Lease assets: Operating lease assets (1) $ 499 Finance lease assets (2) 140 Total lease assets $ 639 Lease liabilities: Operating lease liabilities (3) $ 59 Finance lease liabilities (4) 29 Total lease liabilities—current 88 Operating lease liabilities (5) 442 Finance lease liabilities 105 Total lease liabilities—noncurrent 547 Total lease liabilities $ 635 Virginia Power Operating lease assets (1) $ 212 Finance lease assets (2) 19 Total lease assets $ 231 Lease liabilities: Operating lease liabilities (3) $ 30 Finance lease liabilities (4) 3 Total lease liabilities—current 33 Operating lease liabilities (5) 180 Finance lease liabilities 16 Total lease liabilities—noncurrent 196 Total lease liabilities $ 229 Dominion Energy Gas Operating lease assets (1) $ 37 Finance lease assets (2) 6 Total lease assets $ 43 Lease liabilities: Operating lease liabilities (3) $ 6 Finance lease liabilities (4) 1 Total lease liabilities—current 7 Operating lease liabilities (5) 29 Finance lease liabilities 5 Total lease liabilities—noncurrent 34 Total lease liabilities $ 41 (1) Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets. (2) Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $27 million, $4 million and $1 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at December 31, 2019. (3) Included in other current liabilities in the Companies’ Consolidated Balance Sheets. (4) Included in securities due within one year in the Companies’ Consolidated Balance Sheets. (5) Included in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.
Summary of Total Lease Cost	For the year ended December 31, 2019, total lease cost associated with the Companies’ leasing arrangements consisted of the following: Year Ended December 31, 2019 (millions) Dominion Energy Finance lease cost: Amortization $ 20 Interest 4 Operating lease cost 87 Short-term lease cost 30 Variable lease cost 6 Total lease cost $ 147 Virginia Power Operating lease cost $ 41 Short-term lease cost 13 Variable lease cost 2 Total lease cost $ 56 Dominion Energy Gas Operating lease cost $ 7 Short-term lease cost 7 Total lease cost $ 14
Cash Paid for Amounts Included in Measurement of Lease Liabilities	For the year ended December 31, 2019, cash paid for amounts included in the measurement of the lease liabilities consisted of the following amounts, included in the Companies’ Consolidated Statements of Cash Flows: Year Ended December 31, (millions) Dominion Energy Operating cash flows for finance leases $ 4 Operating cash flows for operating leases 121 Financing cash flows for finance leases 20 Virginia Power Operating cash flows for operating leases 56 Dominion Energy Gas Operating cash flows for operating leases 14
Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases	At December 31, 2019, the weighted average remaining lease term and weighted discount rate for the Companies’ finance and operating leases were as follows: December 31, 2019 Dominion Energy Weighted average remaining lease term—finance leases 5 years Weighted average remaining lease term—operating leases 21 years Weighted average discount rate—finance leases 3.84 % Weighted average discount rate—operating leases 4.47 % Virginia Power Weighted average remaining lease term—finance leases 6 years Weighted average remaining lease term—operating leases 20 years Weighted average discount rate—finance leases 4.12 % Weighted average discount rate—operating leases 4.29 % Dominion Energy Gas Weighted average remaining lease term—finance leases 6 years Weighted average remaining lease term—operating leases 11 years Weighted average discount rate—finance leases 4.08 % Weighted average discount rate—operating leases 4.37 %
Scheduled Maturities of Lease Liabilities	The Companies’ lease liabilities have the following maturities: Maturity of Lease Liabilities Dominion Energy Virginia Power Dominion Energy Operating Finance Operating Finance Operating Finance (millions) 2020 $ 72 $ 34 $ 34 $ 4 $ 7 $ 2 2021 65 31 30 4 6 1 2022 55 29 24 4 5 1 2023 45 26 19 3 4 1 2024 36 19 14 3 3 1 After 2024 582 9 205 4 20 1 Total undiscounted lease payments 855 148 326 22 45 7 Present value adjustment (377 ) (14 ) (139 ) (3 ) (10 ) (1 ) Present value of lease liabilities $ 478 $ 134 $ 187 $ 19 $ 35 $ 6

Short-Term Debt And Credit Agre

Short-Term Debt And Credit Agreements (Tables)	12 Months Ended
	Dec. 31, 2019
Schedule of Line of Credit Facilities	Commercial paper and letters of credit outstanding, as well as capacity available under the credit facility were as follows: Facility Outstanding (1) Outstanding Facility (millions) At December 31, 2019 Joint revolving credit facility (2) $ 6,000 $836 $89 $ 5,075 At December 31, 2018 Joint revolving credit facility (2) $ 6,000 $324 $88 $ 5,588 (1) The weighted-average interest rates of the outstanding commercial paper supported by Dominion Energy’s credit facility was 2.10% and 2.93% at December 31, 2019 and 2018, respectively. (2) This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
Virginia Electric and Power Company
Schedule of Line of Credit Facilities	Virginia Power’s share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Dominion Energy Gas, Questar Gas and DESC were as follows: Facility Outstanding (1) Outstanding (millions) At December 31, 2019 Joint revolving credit facility (2) $6,000 $243 $ 7 At December 31, 2018 Joint revolving credit facility (2) $6,000 $314 $16 (1) The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 2.10% and 2.94% at December 31, 2019 and 2018, respectively. (2) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers sub-limit sub-limit sub-limit, sub-limit sub-limit,
Dominion Energy Gas Holdings, LLC
Schedule of Line of Credit Facilities	Dominion Energy Gas’ share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Virginia Power, Questar Gas and DESC were as follows: Facility Outstanding (1) Outstanding (millions) At December 31, 2019 Joint revolving credit facility (2) $1,500 $62 $— At December 31, 2018 Joint revolving credit facility (2) $1,500 $10 $— (1) The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 1.98% and 2.58% at December 31, 2019 and 2018, respectively. (2) A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers sub-limit sub-limit sub-limit, sub-limit sub-limit,

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Long term Debt	At December 31, 2019 Weighted- average Coupon (1) 2019 2018 (millions, except percentages) Dominion Energy Gas Holdings, LLC: Unsecured senior notes: Variable rate, due 2021 2.49 % $ 500 $ 500 2.5% to 4.8%, due 2019 to 2049 (2) 3.44 % 4,631 3,587 Cove Point, term loan, due 2021 (3) — 3,000 Dominion Energy Midstream: Term loan, variable rate, due 2019 — 300 Revolving credit agreement, variable rate, due 2021 (4) — 73 Dominion Energy Questar Pipeline, unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 4.23 % 430 430 Dominion Energy Gas Holdings, LLC total principal $ 5,561 $ 7,890 Securities due within one year 2.80 % (699 ) (748 ) Credit facility borrowings (4) — (73 ) Unamortized discount and debt issuance costs (41 ) (47 ) Finance leases 5 — Dominion Energy Gas Holdings, LLC total long-term debt $ 4,826 $ 7,022 Virginia Electric and Power Company: Unsecured senior notes: 2.75% to 8.875%, due 2019 to 2049 4.27 % $ 11,789 $ 11,090 Tax- (5) (6) 2.02 % 625 664 Virginia Electric and Power Company total principal $ 12,414 $ 11,754 Securities due within one year 4.29 % (1 ) (350 ) Unamortized discount, premium and debt issuances costs, net (88 ) (83 ) Finance leases 16 — Virginia Electric and Power Company total long-term debt $ 12,341 $ 11,321 Dominion Energy, Inc.: Unsecured senior notes: Variable rates, due 2019 and 2020 2.31 % $ 300 $ 800 1.6% to 7.0%, due 2019 to 2049 (7) 4.15 % 7,688 7,488 Unsecured junior subordinated notes: 2.579% to 4.104%, due 2019 to 2024 3.01 % 2,950 2,100 Payable to affiliated trust, 8.4%, due 2031 8.40 % 10 10 Enhanced junior subordinated notes: Variable rates, due 2066 (8) 4.41 % 397 422 5.25% and 5.75%, due 2054 and 2076 5.48 % 1,485 1,485 Remarketable subordinated notes, 2.0%, due 2021 and 2024 — 1,400 Questar Gas, unsecured senior notes, 2.98% to 7.20%, due 2024 to 2051 4.25 % 750 750 SCANA: Unsecured medium term notes, 4.125% to 6.25%, due 2020 to 2022 (9)(10) 5.06 % 508 — Unsecured senior notes, variable rate, due 2034 (11) 2.61 % 66 — PSNC, senior debentures and notes, 4.13% to 7.45%, due 2020 to 2047 5.05 % 700 — DESC: First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 (12) 5.42 % 3,267 — Tax- (13) Variable rate due 2038 1.65 % 35 — GENCO, variable rates due 2038 (14) 1.65 % 33 — 3.625% and 4.00%, due 2028 and 2033 3.90 % 54 — Other 3.69 % 1 — Secured senior notes, 4.82%, due 2042 (15) 4.82 % 345 362 Term loans, variable rates, due 2023 and 2024 (15) 4.24 % 527 582 Tax- 1.70 % 27 27 Dominion Energy Gas Holdings, LLC total principal (from above) 5,561 7,890 Virginia Electric and Power Company total principal (from above) 12,414 11,754 Dominion Energy, Inc. total principal $ 37,118 $ 35,070 Fair value hedge valuation (16) 4 (20 ) Securities due within one year (8)(10)(11)(17) 3.41 % (3,133 ) (3,624 ) Credit facility borrowings (4) — (73 ) Unamortized discount, premium and debt issuance costs, net (270 ) (248 ) Finance leases 105 39 Dominion Energy, Inc. total long-term debt $ 33,824 $ 31,144 (1) Represents weighted-average coupon rates for debt outstanding as of December 31, 2019. (2) Amount includes foreign currency remeasurement adjustments. (3) In September 2019, Cove Point repaid its $3.0 billion term loan due in 2021. (4) In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018. (5) These financings relate to certain pollution control equipment at Virginia Power’s generating facilities. (6) In May 2019, Virginia Power redeemed its $40 million 5.0% Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 at the principal outstanding plus accrued interest. (7) Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary. (8) In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (9) In March 2019, SCANA purchased certain of its medium term notes having an aggregate purchase price of $300 million pursuant to tender offer that expired in the first quarter of 2019. (10) In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (11) In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. (12) In February, March and September 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.8 billion pursuant to tender offers. The February and March tender offers expired in the first quarter of 2019 and the September tender offer expired in the third quarter of 2019. (13) Industrial revenue bonds totaling $68 million are secured by letters of credit that (1 4 In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released. (1 5 Represents debt associated with Eagle Solar, SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s, SBL Holdco’s and Dominion Solar Projects III, Inc’s interest in certain solar facilities. (1 6 Represents the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt. (1 7 Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc.
Scheduled Principal Payments of Long-Term Debt	Based on stated maturity dates rather than early redemption dates that could be elected by instrument holders, the scheduled principal payments of long-term debt at December 31, 2019, were as follows: 2020 2021 2022 2023 2024 Thereafter Total (millions, except percentages) Dominion Energy Gas $ 700 $ 500 $ — $ 650 $ 1,050 $ 2,661 $ 5,561 Weighted-average coupon 2.80 % 2.49 % — 3.29 % 2.97 % 3.95 % Virginia Power Unsecured senior notes $ — $ — $ 750 $ 700 $ 350 $ 9,989 $ 11,789 Tax- — — — — 625 625 Total $ — $ — $ 750 $ 700 $ 350 $ 10,614 $ 12,414 Weighted-average coupon — — 3.15 % 2.75 % 3.45 % 4.35 % Dominion Energy Term loans (1 ) $ 35 $ 35 $ 34 $ 259 $ 164 $ — $ 527 First mortgage bonds — 33 — — — 3,234 3,267 Unsecured senior notes (2)(3) 1,275 1,237 1,659 2,355 1,745 19,092 27,363 Secured senior notes 15 17 19 16 17 261 345 Tax- — — — — — 774 774 Unsecured junior subordinated notes payable to affiliated trusts — — — — — 10 10 Unsecured junior subordinated notes 1,000 1,250 — — 700 — 2,950 Enhanced junior subordinated notes (4) — — — — — 1,882 1,882 Total $ 2,325 $ 2,572 $ 1,712 $ 2,630 $ 2,626 $ 25,253 $ 37,118 Weighted-average coupon 3.09 % 3.15% 3.10 % 2.95% 3.19% 4.62 % (1) Excludes mandatory prepayments associated with SBL Holdco and Dominion Solar Projects III, Inc. based on cash flows in excess of debt service. At December 31, 2019, $20 million of estimated mandatory prepayments due within one year were included in securities due within one year in Dominion Energy’s Consolidated Balance Sheets. (2) In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. (3) In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. (4) In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within current liabilities in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.

Preferred Stock (Tables)

Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2019
Preferred Stock [Member]
Preferred Stock	Selected information about Dominion Energy’s 2019 Equity Units is presented below: Issuance Date Units Total Net Proceeds (1) Total (2) Cumulative Dividend Rate Stock Purchase Contract Annual Stock Purchase Contract Liability (3) Stock Purchase Contract Settlement Date (millions except interest rates) 6/14/2019 16 $ 1,582 $1,610 1.75 % 5.5 % $250 6/1/2022 (1) Issuance costs of $28 million were recorded as a reduction to preferred stock ($14 million) and common stock ($14 million) in the Consolidated Balance Sheets. (2) Dominion Energy recorded dividends of $15 million ($9.479 per share) for the year ended December 31, 2019. (3) Payments of $38 million were made in 2019. The stock purchase contract liability was $212 million at December 31, 2019.

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Schedule of Accumulated Other Comprehensive Income (Loss)	Presented in the table below is a summary of AOCI by component: At December 31, 2019 2018 (millions) Dominion Energy Net deferred losses on derivatives-hedging activities, net of $135 and $79 tax $ (407 ) $ (234 ) Net unrealized gains on nuclear decommissioning trust funds, net of $(13) and $— tax 37 2 Net unrecognized pension and other postretirement benefit costs, net of $492 and $519 tax (1,421 ) (1,465 ) Other comprehensive loss from equity method investees, net of $1 and $— tax (2 ) (2 ) Total AOCI, including noncontrolling interests $ (1,793 ) $ (1,699 ) Less other comprehensive income attributable to noncontrolling interests — 1 Total AOCI, excluding noncontrolling interests $ (1,793 ) $ (1,700 ) Virginia Power Net deferred losses on derivatives-hedging activities, net of $11 and $4 tax $ (34 ) $ (13 ) Net unrealized gains on nuclear decommissioning trust funds, net of $(1) and $— tax 5 1 Total AOCI $ (29 ) $ (12 ) Dominion Energy Gas Net deferred losses on derivatives-hedging activities, net of $28 and $8 tax $ (82 ) $ (25 ) Net unrecognized pension costs, net of $41 and $56 tax (106 ) (144 ) Total AOCI, including noncontrolling interests (188 ) (169 ) Less other comprehensive income (loss) attributable to noncontrolling interests (1 ) — Total AOCI, excluding noncontrolling interests $ (187 ) $ (169 ) Dominion Energy The following table presents Dominion Energy’s changes in AOCI by component, net of tax: Deferred Unrealized Unrecognized Other Total (millions) Year Ended December 31, 2019 Beginning balance $(235) $ 2 $(1,465 ) $(2 ) $(1,700) Other comprehensive income before reclassifications: gains (losses) (110) 39 (22) — (93) Amounts reclassified from AOCI: (gains) losses (1) (62) (4) 66 — — Net current period other comprehensive income (loss) (172) 35 44 — (93 ) Ending balance $(407) $37 $(1,421 ) $(2 ) $(1,793 ) Year Ended December 31, 2018 Beginning balance $(302) $747 $(1,101) $(3) $(659 ) Other comprehensive income before reclassifications: gains (losses) 30 (18 ) (215) 1 (202 ) Amounts reclassified from AOCI: (gains) losses (1) 102 5 78 — 185 Net current period other comprehensive income (loss) 132 (13) (137) 1 (17) Cumulative-effect of changes in accounting principle (64) (732) (227) — (1,023 ) Less other comprehensive income (loss) attributable to noncontrolling interests 1 — — — 1 Ending balance $(235) $ 2 $(1,465) $(2) $ (1,700 ) (1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents Dominion Energy’s reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $(146) Operating revenue 3 Purchased gas Interest rate contracts 54 Interest and related charges Foreign currency contracts 6 Other Income Total (83 ) Tax 21 Income tax expense Total, net of tax $(62 ) Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $(5) Other income Total (5) Tax 1 Income tax expense Total, net of tax $(4 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $(24) Other income Amortization of actuarial losses 113 Other income Total 89 Tax (23 ) Income tax expense Total, net of tax $66 Year Ended December 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $90 Operating revenue (14 ) Purchased gas Interest rate contracts 48 Interest and related charges Foreign currency contracts 13 Other Income Total 137 Tax (35 ) Income tax expense Total, net of tax $102 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $7 Other income Total 7 Tax (2 ) Income tax expense Total, net of tax $5 Unrecognized pension and other postretirement benefit costs: Prior-service costs (credits) $(21 ) Other income Actuarial losses 120 Other income Total 99 Tax (21 ) Income tax expense Total, net of tax $78
Summary of Restricted Stock Activity	The following table provides a summary of restricted stock activity for the years ended December 31, 2019, 2018 and 2017: Shares Weighted—average (thousands) Nonvested at December 31, 2016 886 $71.40 Granted 454 74.24 Vested (287 ) 68.90 Cancelled and forfeited (10 ) 72.37 Nonvested at December 31, 2017 1,043 $73.32 Granted 534 72.92 Vested (316 ) 73.59 Cancelled and forfeited (53 ) 74.25 Nonvested at December 31, 2018 1,208 $73.03 Granted 614 76.49 Vested (324 ) 71.75 Cancelled and forfeited (96 ) 77.16 Nonvested at December 31, 2019 1,402 $74.77
Virginia Electric and Power Company
Schedule of Accumulated Other Comprehensive Income (Loss)	Virginia Power The following table presents Virginia Power’s changes in AOCI by component, net of tax: Deferred Unrealized Total (millions) Year Ended December 31, 2019 Beginning balance $(13 ) $ 1 $(12) Other comprehensive income before reclassifications: gains (losses) (22 ) 5 (17) Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) (21 ) 4 (17) Ending balance $(34 ) $ 5 $(29) Year Ended December 31, 2018 Beginning balance $(12 ) $ 74 $ 62 Other comprehensive income before reclassifications: gains (losses) 1 — 1 Amounts reclassified from AOCI: gains (losses) (1) 1 — 1 Net current period other comprehensive income (loss) 2 — 2 Cumulative-effect of changes in accounting principle (3 ) (73 ) (76) Ending balance $(13 ) $ 1 $ (12) (1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents Virginia Power’s reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 (Gains) losses on cash flow hedges: Interest rate contracts $ 1 Interest and related charges Total 1 Tax — Income tax expense Total, net of tax $ 1 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (2) Other income Impairment — Other income Total (2) Tax 1 Income tax expense Total, net of tax $ (1) Year Ended December 31, 2018 (Gains) losses on cash flow hedges: Interest rate contracts $ 1 Interest and related charges Total 1 Tax — Income tax expense Total, net of tax $ 1
Dominion Energy Gas Holdings, LLC
Schedule of Accumulated Other Comprehensive Income (Loss)	Dominion Energy Gas The following table presents Dominion Energy Gas’ changes in AOCI by component, net of tax: Deferred gains Unrecognized Total (millions) Year Ended December 31, 2019 Beginning balance $(25 ) $(144 ) $ (169) Other comprehensive income before reclassifications: gains (losses) (61 ) 33 (28 ) Amounts reclassified from AOCI: (gains) losses (1) 5 5 10 Net current period other comprehensive income (loss) (56 ) 38 (18 ) Dominion Energy Gas Restructuring (1 ) — (1 ) Less other comprehensive income attributable to noncontrolling interests (1 ) — (1 ) Ending balance $(81 ) $(106 ) $ (187 ) Year Ended December 31, 2018 Beginning balance $(23 ) $(75 ) $ (98 ) Other comprehensive income before reclassifications: gains (losses) (16 ) (52 ) (68 ) Amounts reclassified from AOCI: gains (losses) (1) 19 4 23 Net current period other comprehensive income (loss) 3 (48 ) (45 ) Cumulative-effect of changes in accounting principle (5 ) (21 ) (26 ) Ending balance $(25 ) $(144 ) $(169 ) (1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents Dominion Energy Gas’ reclassifications out of AOCI by component: Details about AOCI components Amounts Affected line item in the (millions) Year Ended December 31, 2019 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (4) Net income from discontinued operations Interest rate contracts 5 Interest and related charges Foreign currency contracts 6 Other income Total 7 Tax (2) Income tax expense Total, net of tax $ 5 Unrecognized pension costs: Actuarial losses $ 7 Other income Total 7 Tax (2) Income tax expense Total, net of tax $ 5 Year Ended December 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 8 Net income from discontinued operations Interest rate contracts 5 Interest and related charges Foreign currency contracts 13 Other income Total 26 Tax (7) Income tax expense Total, net of tax $19 Unrecognized pension costs: Actuarial losses $ 6 Other income Total 6 Tax (2) Income tax expense Total, net of tax $ 4

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Pension plan and other postretirement benefit plan obligations and plan assets and includes a statement of the plans funded status	The following table summarizes the changes in pension plan and other postretirement benefit plan obligations and plan assets and includes a statement of the plans’ funded status for Dominion Energy and Dominion Energy Gas (for employees represented by collective bargaining units): Pension Benefits Other Postretirement Benefits Year Ended December 31, 2019 2018 2019 2018 (millions, except percentages) Dominion Energy Changes in benefit obligation: Benefit obligation at beginning of year $ 8,500 $ 9,052 $ 1,363 $ 1,529 Dominion Energy SCANA Combination (See Note 3) 854 — 253 — Service cost 162 157 26 27 Interest cost 394 337 68 56 Benefits paid (470 ) (358 ) (96 ) (87 ) Actuarial (gains) losses during the year 1,054 (688 ) 111 (158 ) Plan amendments — — — (4 ) Settlements and curtailments (1) (48 ) — 44 — Benefit obligation at end of year $ 10,446 $ 8,500 $ 1,769 $ 1,363 Changes in fair value of plan assets: Fair value of plan assets at beginning of year $ 7,197 $ 8,062 $ 1,581 $ 1,729 Dominion Energy SCANA Combination (See Note 3) 727 — — — Actual return (loss) on plan assets 1,747 (513 ) 349 (92 ) Employer contributions 557 6 12 12 Benefits paid (470 ) (358 ) (62 ) (68 ) Settlements (2) (127 ) — — — Fair value of plan assets at end of year $ 9,631 $ 7,197 $ 1,880 $ 1,581 Funded status at end of year $ (815 ) $ (1,303 ) $ 111 $ 218 Amounts recognized in the Consolidated Balance Sheets at December 31: Noncurrent pension and other postretirement benefit assets $ 1,266 $ 1,003 $ 442 $ 276 Other current liabilities (29 ) (34 ) (17 ) (2 ) Noncurrent pension and other postretirement benefit liabilities (2,052 ) (2,272 ) (314 ) (56 ) Net amount recognized $ (815 ) $ (1,303 ) $ 111 $ 218 Significant assumptions used to determine benefit obligations as of December 31: Discount rate 3.47%–3.63% 4.42%–4.43% 3.44%–3.52% 4.37%–4.38% Weighted average rate of increase for compensation 4.23% 4.32% n/a n/a Dominion Energy Gas Changes in benefit obligation: Benefit obligation at beginning of year $ 730 $ 773 $ 256 $ 290 Dominion Energy Gas Restructuring (See Note 3) (468 ) — (135 ) — Service cost 6 18 1 4 Interest cost 11 29 5 11 Benefits paid (15 ) (34 ) (8 ) (18 ) Actuarial (gains) losses during the year 30 (56 ) 1 (27 ) Plan amendments — — — (4 ) Settlements and curtailments (1) 1 — 1 — Benefit obligation at end of year $ 295 $ 730 $ 121 $ 256 Changes in fair value of plan assets: Fair value of plan assets at beginning of year $ 1,656 $ 1,803 $ 311 $ 333 Dominion Energy Gas Restructuring (1,084 ) — $ (126 ) — Actual return (loss) on plan assets 129 (113 ) 38 (16 ) Employer contributions — — 12 12 Benefits paid (15 ) (34 ) (8 ) (18 ) Fair value of plan assets at end of year $ 686 $ 1,656 $ 227 $ 311 Funded status at end of year $ 391 $ 926 $ 106 $ 55 Amounts recognized in the Consolidated Balance Sheets at December 31: Noncurrent pension and other postretirement benefit assets $ 391 $ 310 $ 106 $ 63 Noncurrent assets of discontinued operations — 616 — — Noncurrent liabilities of discontinued operations — — — (8 ) Net amount recognized $ 391 $ 926 $ 106 $ 55 Significant assumptions used to determine benefit obligations as of December 31: Discount rate 3.63 % 4.42 % 3.44 % 4.37 % Weighted average rate of increase for compensation 4.64 % 4.55 % n/a n/a (1) 2019 amounts relate primarily to a settlement as a result of the voluntary retirement program.
Benefit obligation in excess of plan asset	The following table provides information on the benefit obligations and fair value of plan assets for plans with a benefit obligation in excess of plan assets for Dominion Energy and Dominion Energy Gas (for employees represented by collective bargaining units): Pension Benefits Other Postretirement Benefits As of December 31, 2019 2018 2019 2018 (millions) Dominion Energy Benefit obligation $ 9,552 $ 7,705 $ 341 $ 164 Fair value of plan assets 7,471 5,398 10 136 Dominion Energy Gas Benefit obligation $ — $ — $ — $ 134 Fair value of plan assets — — — 126
Accumulated benefit obligation in excess of plan assets	The following table provides information on the ABO and fair value of plan assets for Dominion Energy’s pension plans with an ABO in excess of plan assets: As of December 31, 2019 2018 (millions) Accumulated benefit obligation $ 8,852 $ 7,056 Fair value of plan assets 7,471 5,398
Benefit payments expected future service	The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans: Estimated Future Benefit Payments Pension Benefits Other Postretirement Benefits (millions) Dominion Energy 2020 $ 535 $ 120 2021 472 117 2022 511 116 2023 519 114 2024 536 113 2025-2029 2,792 528 Dominion Energy Gas 2020 $ 15 $ 8 2021 15 8 2022 15 8 2023 15 8 2024 15 8 2025-2029 79 36
Fair values of pension and post retirement plan assets by asset category	The fair values of Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) pension plan assets by asset category are as follows: At December 31, 2019 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Dominion Energy Cash and cash equivalents $ 22 $ 1 $ — $ 23 $ 17 $ 1 $— $ 18 Common and preferred stocks: U.S. (1) 2,284 — — 2,284 1,645 — — 1,645 International 1,634 — — 1,634 1,061 — — 1,061 Insurance contracts — 360 — 360 — 318 — 318 Corporate debt instruments 273 859 — 1,132 23 729 — 752 Government securities 58 757 — 815 25 605 — 630 Total recorded at fair value $ 4,271 $ 1,977 $— $ 6,248 $ 2,771 $ 1,653 $— $ 4,424 Assets recorded at NAV (2) Common/collective trust funds 2,355 1,849 Alternative investments: Real estate funds 91 108 Private equity funds 787 633 Debt funds 159 155 Hedge funds 14 17 Total recorded at NAV $ 3,406 $ 2,762 Total investments (3) $ 9,654 $ 7,186 Dominion Energy Gas Cash and cash equivalents $ 1 $ — $ — $ 1 $ 4 $ — $— $ 4 Common and preferred stocks: U.S. 177 — — 177 378 — — 378 International 114 — — 114 244 — — 244 Insurance contracts — 28 — 28 — 73 — 73 Corporate debt instruments 3 66 — 69 5 168 — 173 Government securities 2 59 — 61 6 139 — 145 Total recorded at fair value $ 297 $ 153 $— $ 450 $ 637 $ 380 $— $ 1,017 Assets recorded at NAV (2) Common/collective trust funds 157 425 Alternative investments: Real estate funds 7 25 Private equity funds 61 146 Debt funds 12 36 Hedge funds 1 4 Total recorded at NAV $ 238 $ 636 Total investments (4) $ 688 $ 1,653 (1) Includes $508 million of Dominion Energy common stock at December 31, 2019. (2) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. (3) Excludes net assets related to pending sales of securities of $52 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $99 million at December 31, 2019. Excludes net assets related to pending sales of securities of $12 million, net accrued income of $21 million, and includes net assets related to pending purchases of securities of $22 million at December 31, 2018. (4) Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $6 million at December 31, 2019. Excludes net assets related to pending sales of securities of $3 million, net accrued income of $5 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2018. The fair values of Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) other postretirement plan assets by asset category are as follows: At December 31, 2019 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (millions) Dominion Energy Cash and cash equivalents $ 2 $ — $— $ 2 $ 1 $ 1 $— $ 2 Common and preferred stocks: U.S. 719 — — 719 554 — — 554 International 206 — — 206 170 — — 170 Insurance contracts — 21 — 21 — 19 — 19 Corporate debt instruments 1 50 — 51 1 44 — 45 Government securities 2 44 — 46 2 37 — 39 Total recorded at fair value $ 930 $ 115 $— $ 1,045 $ 728 $ 101 $— $ 829 Assets recorded at NAV (1) Common/collective trust funds 717 650 Alternative investments: Real estate funds 8 10 Private equity funds 100 80 Debt funds 10 10 Hedge funds 1 1 Total recorded at NAV $ 836 $ 751 Total investments (2) $ 1,881 $ 1,580 Dominion Energy Gas Common and preferred stocks: U.S. $ 86 $ — $— $ 86 $ 113 $ — $— $ 113 International 21 — — 21 30 — — 30 Total recorded at fair value $ 107 $ — $— $ 107 $ 143 $ — $— $ 143 Assets recorded at NAV (1) Common/collective trust funds 105 148 Alternative investments: Real estate funds 1 2 Private equity funds 14 18 Debt funds — — Total recorded at NAV $ 120 $ 168 Total investments $ 227 $ 311 (1) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy. (2) Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2019. Excludes net assets related to pending sales of securities of $1 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2018.
Net periodic benefit (credit) cost and amounts recognized in other comprehensive income and regulatory assets and liabilities	The components of the provision for net periodic benefit (credit) cost and amounts recognized in other comprehensive income and regulatory assets and liabilities for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans are as follows: Pension Benefits Other Postretirement Benefits Year Ended December 31, 2019 2018 2017 2019 2018 2017 (millions, except percentages) Dominion Energy Service cost $ 162 $ 157 $ 138 $ 26 $ 27 $ 26 Interest cost 394 337 345 68 56 60 Expected return on plan assets (708 ) (663 ) (639 ) (140 ) (143 ) (128 ) Amortization of prior service (credit) cost 1 1 1 (52 ) (52 ) (51 ) Amortization of net actuarial loss 172 193 162 10 11 13 Settlements and curtailments 72 — — 42 — — Net periodic benefit (credit) cost $ 93 $ 25 $ 7 $ (46 ) $ (101 ) $ (80 ) Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities: Current year net actuarial (gain) loss $ 16 $ 490 $ 142 $ (98 ) $ 78 $ 12 Prior service (credit) cost — — 5 2 (4 ) (73 ) Settlements and curtailments 6 — 1 — — 2 Less amounts included in net periodic benefit cost: Amortization of net actuarial loss (172 ) (193 ) (162 ) (10 ) (11 ) (13 ) Amortization of prior service credit (cost) (1 ) (1 ) (1 ) 52 52 51 Total recognized in other comprehensive income and regulatory assets and liabilities $ (151 ) $ 296 $ (15 ) $ (54 ) $ 115 $ (21 ) Significant assumptions used to determine periodic cost: Discount rate 3.57%- % 3.80%-3.81 % 3.31%-4.50 % 4.05% - % 3.76 % 3.92%-4.47 % Expected long-term rate of return on plan assets 7.00%- % 8.75 % 8.75 % 8.50 % 8.50 % 8.50 % Weighted average rate of increase for compensation 4.20 % 4.09 % 4.09 % n/a n/a n/a Healthcare cost trend rate (1) 6.50% - % 7.00 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (1) 5.00 % 5.00 % 5.00 % Year that the rate reaches the ultimate trend rate (1) 2023-2025 2022 2021 Dominion Energy Gas (2) Service cost $ 6 $ 18 $ 15 $ 1 $ 4 $ 4 Interest cost 11 29 30 5 11 12 Expected return on plan assets (54 ) (150 ) (141 ) (16 ) (28 ) (24 ) Amortization of prior service (credit) cost — — — (5 ) (4 ) (3 ) Amortization of net actuarial loss 7 19 16 3 3 2 Settlements and curtailments 1 — — 1 — — Net periodic benefit (credit) cost $ (29 ) $ (84 ) $ (80 ) $ (11 ) $ (14 ) $ (9 ) Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities: Current year net actuarial (gain) loss $ (46 ) $ 207 $ (75 ) $ (21 ) $ 16 $ 18 Prior service cost — — — — (4 ) (61 ) Less amounts included in net periodic benefit cost: Amortization of net actuarial loss (7 ) (19 ) (16 ) (3 ) (3 ) (2 ) Amortization of prior service credit (cost) — — — 5 4 3 Total recognized in other comprehensive income and regulatory assets and liabilities $ (53 ) $ 188 $ (91 ) $ (19 ) $ 13 $ (42 ) Significant assumptions used to determine periodic cost: Discount rate 4.10%-4.42 % 3.81 % 4.50 % 4.05%-4.37 % 3.81 % 4.47 % Expected long-term rate of return on plan assets 8.65 % 8.75 % 8.75 % 8.50 % 8.50 % 8.50 % Weighted average rate of increase for compensation 4.55 % 4.11 % 4.11 % n/a n/a n/a Healthcare cost trend rate (1) 6.50 % 7.00 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (1) 5.00 % 5.00 % 5.00 % Year that the rate reaches the ultimate trend rate (1) 2025 2022 2021 (1) Assumptions used to determine net periodic cost for the following year. (2) Amounts related to East Ohio are presented within discontinued operations.
Components of AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost	The components of AOCI and regulatory assets and liabilities for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans that have not been recognized as components of net periodic benefit (credit) cost are as follows: Pension Benefits Other Postretirement Benefits At December 31, 2019 2018 2019 2018 (millions) Dominion Energy Net actuarial loss $ 3,327 $ 3,477 $ 241 $ 350 Prior service (credit) cost 5 7 (339 ) (393 ) Total (1) $ 3,332 $ 3,484 $ (98 ) $ (43 ) Dominion Energy Gas Net actuarial loss $ 150 $ 555 $ 44 $ 89 Prior service (credit) cost — — (49 ) (52 ) Total (2) $ 150 $ 555 $ (5 ) $ 37 (1) As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. (2) As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in noncurrent assets of discontinued operations; of the , $22 million in noncurrent assets of discontinued operations with the remainder included
Components of AOCI and regulatory assets and liabilities that are expected to be amortized as components of periodic benefit cost in 2020	The following table provides the components of AOCI and regulatory assets and liabilities for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) plans as of December 31, 2019 that are expected to be amortized as components of net periodic benefit (credit) cost in 2020: Pension Benefits Other Benefits (millions) Dominion Energy Net actuarial loss $194 $5 Prior service (credit) cost 1 (50 ) Dominion Energy Gas Net actuarial loss $7 $2 Prior service (credit) cost — (5 )
Effect of one percentage point change on benefit plans	A one percentage point change in assumed healthcare cost trend rates would have had the following effects for Dominion Energy and Dominion Energy Gas’ (for employees represented by collective bargaining units) other postretirement benefit plans: Other Postretirement Benefits One percentage point increase One percentage point decrease (millions) Dominion Energy Effect on net periodic cost for 2020 $20 $(11) Effect on other postretirement benefit obligation at December 31, 2019 153 (128) Dominion Energy Gas Effect on net periodic cost for 2020 $2 $(2) Effect on other postretirement benefit obligation at December 31, 2019 14 (12)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Nuclear Insurance	The current levels of nuclear property insurance coverage for Dominion Energy and Virginia Power’s nuclear units are as follows: Coverage (billions) Dominion Energy Millstone $ 1.70 Kewaunee 0.05 Summer 2.75 Virginia Power (1) Surry $ 1.70 North Anna 1.70 (1) Surry and North Anna share a blanket property limit of $200 million.
Schedule Of Subsidiary Guarantees	At December 31, 2019, Dominion Energy had issued the following subsidiary guarantees: Maximum Exposure (millions) Commodity transactions (1) $ 2,215 Nuclear obligations (2) 182 Cove Point (3) 1,900 Solar (4) 477 Other (5) 377 Total (6) $ 5,151 (1) Guarantees related to commodity commitments of certain subsidiaries. These guarantees were provided to counterparties in order to facilitate physical and financial transaction related commodities and services. (2) Guarantees primarily related to certain DGI subsidiaries’ regarding all aspects of running a nuclear facility. (3) Guarantees related to Cove Point, in support of terminal services, transportation and construction. Cove Point has two guarantees that have no maximum limit and, therefore, are not included in this amount. (4) Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects. (5) Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of worker’s compensation claims, the parental guarantee has no stated limit. (6) Excludes Dominion Energy’s guarantees for the new corporate office properties discussed further within Note 15.
Virginia Electric and Power Company
Long-term Purchase Commitment	At December 31, 2019, Dominion Energy had the following long-term commitments that are noncancelable or are cancelable only under certain conditions, and that a third party has used to secure financing for the facility that will provide the contracted goods or services: 2020 2021 2022 2023 2024 Thereafter Total (millions) Purchased electric capacity (1) $45 $44 $44 $44 $44 $494 $715 (1) Commitments represent estimated amounts payable for energy under power purchase contracts with qualifying facilities which expire at various dates through 2046. Energy payments are generally based on fixed dollar amounts per month and totaled $29 million for the year ended December 31, 2019.

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
Virginia Electric and Power Company
Schedule of Related Party Transactions	Presented below are significant transactions with DES and other affiliates: Year Ended December 31, 2019 2018 2017 (millions) Commodity purchases from affiliates $ 690 $ 930 $ 674 Services provided by affiliates (1) 503 450 453 Services provided to affiliates 24 24 25 (1) Includes capitalized expenditures of $133 million, $145 million and $144 million for the year ended December 31, 2019, 2018 and 2017, respectively.
Dominion Energy Gas Holdings, LLC
Schedule of Related Party Transactions	The costs of these services follow: Year Ended December 31, 2019 2018 2017 (millions) Sales of natural gas and transportation and storage services $ 249 $ 168 $ 173 Purchases of natural gas and transportation and storage services 12 — 10 Services provided by related parties (1) 226 169 193 Services provided to related parties (2) 164 260 190 (1) Includes capitalized expenditures of $19 million, $37 million and $53 million for the year ended December 31, 2019, 2018 and 2017, respectively. (2) Amounts primarily attributable to Atlantic Coast Pipeline, a related party VIE.
Schedule of Related Party Transactions	The following table presents affiliated and related party balances reflected in Dominion Energy Gas’ Consolidated Balance Sheets: At December 31, 2019 2018 (millions) Other receivables (1) $ 7 $ 13 Imbalances receivable from affiliates 8 16 Imbalances payable from affiliates (2) 1 4 Other deferred charges and other assets 12 — (1) Represents amounts due from Atlantic Coast Pipeline, a related party VIE. (2) Amounts are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

Operating Segments (Tables)

Operating Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting Information [Line Items]
Schedule of Primary Operating Segments	The Companies are organized primarily on the basis of products and services sold in the U.S. A description of the operations included in the Companies’ primary operating segments is as follows: Primary Operating Description of Operations Dominion Virginia Dominion Dominion Energy Virginia Regulated electric distribution X X Regulated electric transmission X X Regulated electric generation fleet (1) X X Gas Transmission & Storage Regulated gas transmission and storage (2) X X LNG terminalling and storage X X Nonregulated retail energy marketing X Gas Distribution Regulated gas distribution and storage (3) X Dominion Energy South Carolina Regulated electric distribution X Regulated electric transmission X Regulated electric generation fleet X Regulated gas distribution and storage X Contracted Generation Merchant electric generation fleet X (1) Includes Virginia Power’s nonjurisdictional generation operations. (2) Includes gathering and processing activities. (3) Includes Wexpro’s natural gas development and production operations.
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Dominion Energy’s operations: Year Ended December 31, Dominion Gas Gas Dominion Contracted Corporate and Other Adjustments & Eliminations Consolidated Total (millions) 2019 Total revenue from external customers $8,170 $3,074 $2,367 $2,948 $1,135 $(1,122 ) $ — $16,572 Intersegment revenue (13 ) 247 18 4 15 1,199 (1,470 ) — Total operating revenue 8,157 3,321 2,385 2,952 1,150 77 (1,470 ) 16,572 Depreciation, depletion and amortization 1,216 400 335 452 179 73 — 2,655 Equity in earnings of equity method investees — 161 2 (4 ) (1 ) 10 — 168 Interest income 11 211 4 9 92 160 (386 ) 101 Interest and related charges 530 405 116 242 98 768 (386 ) 1,773 Income tax expense (benefit) 482 262 114 163 20 (690 ) — 351 Net income (loss) attributable to Dominion Energy 1,786 934 488 430 276 (2,556 ) — 1,358 Investment in equity method investees — 1,517 32 — 74 23 — 1,646 Capital expenditures 3,002 431 848 562 367 111 — 5,321 Total assets (billions) 43.7 20.9 16.0 15.8 10.2 6.9 (9.7 ) 103.8 2018 Total revenue from external customers $8,401 $1,867 $1,769 $ — $1,487 $ (249 ) $ 91 $13,366 Intersegment revenue (552 ) 723 16 — 8 723 (918 ) — Total operating revenue 7,849 2,590 1,785 — 1,495 474 (827 ) 13,366 Depreciation, depletion and amortization 1,158 348 263 — 213 18 — 2,000 Equity in earnings of equity method investees — 178 — — 18 1 — 197 Interest income 10 143 — — 80 122 (271 ) 84 Interest and related charges 516 262 79 — 124 784 (272 ) 1,493 Income tax expense (benefit) 380 236 95 — 75 (206 ) — 580 Net income (loss) attributable to Dominion Energy 1,596 844 373 — 245 (611 ) — 2,447 Investment in equity method investees — 1,159 — — 82 37 — 1,278 Capital expenditures 2,640 765 647 — 247 106 — 4,405 Total assets (billions) 39.1 22.6 11.8 — 9.0 8.3 (12.9 ) 77.9 2017 Total revenue from external customers $8,254 $1,054 $1,778 $ — $1,345 $ (27 ) $ 182 $12,586 Intersegment revenue (688 ) 946 17 — 9 724 (1,008 ) — Total operating revenue 7,566 2,000 1,795 — 1,354 697 (826 ) 12,586 Depreciation, depletion and amortization 1,141 260 258 — 200 46 — 1,905 Equity in earnings of equity method investees — 158 — — (171 ) (5 ) — (18 ) Interest income 19 114 — — 77 94 (222 ) 82 Interest and related charges 497 100 72 — 110 648 (222 ) 1,205 Income tax expense (benefit) 865 291 195 — (160 ) (1,221 ) — (30 ) Net income (loss) attributable to Dominion Energy 1,466 552 351 — 253 377 — 2,999 Capital expenditures 2,726 1,489 452 — 979 263 — 5,909
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Virginia Power’s operations: Year Ended December 31, Dominion Energy Virginia Corporate Consolidated Total (millions) 2019 Operating revenue $8,137 $ (29 ) $8,108 Depreciation and amortization 1,215 8 1,223 Interest income 11 — 11 Interest expense (benefit) and related charges 529 (5 ) 524 Income tax expense (benefit) 481 (217 ) 264 Net income (loss) 1,783 (634 ) 1,149 Capital expenditures 2,981 — 2,981 Total assets (billions) 41.4 — 41.4 2018 Operating revenue $7,835 $(216 ) $7,619 Depreciation and amortization 1,157 (25 ) 1,132 Interest income (expense) 10 — 10 Interest expense (benefit) and related charges 516 (5 ) 511 Income tax expense (benefit) 378 (78 ) 300 Net income (loss) 1,594 (312 ) 1,282 Capital expenditures 2,542 — 2,542 Total assets (billions) 37.0 (0.1 ) 36.9 2017 Operating revenue $7,556 $ — $7,556 Depreciation and amortization 1,141 — 1,141 Interest income (expense) 19 — 19 Interest expense (benefit) and related charges 497 (3 ) 494 Income tax expense (benefit) 868 (94 ) 774 Net income 1,466 74 1,540 Capital expenditures 2,729 — 2,729
Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Dominion Energy Gas’ operations: Year Ended December 31, Gas Corporate and Other Consolidated Total (millions) 2019 Operating revenue $2,186 $ (17 ) $2,169 Depreciation and amortization 367 — 367 Equity in earnings of equity method investees 43 — 43 Interest income 105 — 105 Interest and related charges 309 2 311 Income tax expense (benefit) 170 (69 ) 101 Net Income from discontinued operations — 141 141 Net Income attributable to Dominion Energy Gas 594 127 721 Investment in equity method investees 312 — 312 Capital expenditures 391 313 704 Total assets (billions) 18.8 — 18.8 2018 Operating revenue $1,996 $ — $1,996 Depreciation and amortization 333 — 333 Equity in earnings of equity method investees 54 — 54 Interest income 26 — 26 Interest and related charges 173 1 174 Income tax expense (benefit) 226 (102 ) 124 Net Income from discontinued operations — 24 24 Net Income (loss) attributable to Dominion Energy Gas 571 (90 ) 481 Investment in equity method investees 339 — 339 Capital expenditures 749 360 1,109 Total assets (billions) 19.9 6.9 26.8 2017 Operating revenue $1,523 $ — $1,523 Depreciation and amortization 242 — 242 Equity in earnings of equity method investees 47 — 47 Interest income 4 — 4 Interest and related charges 60 — 60 Income tax expense (benefit) 189 (254 ) (65 ) Net Income from discontinued operations — 163 163 Net Income attributable to Dominion Energy Gas 314 389 703 Capital expenditures 1,459 356 1,815

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Data	A summary of the Companies’ quarterly results of operations for the years ended December 31, 2019 and 2018 follows. Amounts reflect all adjustments necessary in the opinion of management for a fair statement of the results for the interim periods. Results for interim periods may fluctuate as a result of weather conditions, changes in rates and other factors. Dominion Energy First Second Third Fourth (millions) 2019 Operating revenue $ 3,858 $ 3,970 $ 4,269 $ 4,475 Income (loss) from operations (482 ) 461 1,314 1,221 Net income (loss) including noncontrolling interests (677 ) 58 985 1,010 Net income (loss) attributable to Dominion Energy (680 ) 54 975 1,009 Basic EPS: Net income (loss) attributable to Dominion Energy (0.86 ) 0.07 1.19 1.22 Diluted EPS: Net income (loss) attributable to Dominion Energy (0.86 ) 0.05 1.17 1.21 Dividends per share (Series A Preferred Stock) — 0.729 4.375 4.375 Dividends per share (Series B Preferred Stock) — — — 1.9375 Dividends declared per common share 0.9175 0.9175 0.9175 0.9175 2018 Operating revenue $ 3,466 $ 3,088 $ 3,451 $ 3,361 Income from operations 875 742 1,150 834 Net income including noncontrolling interests 526 478 883 662 Net income attributable to Dominion Energy 503 449 854 641 Basic EPS: Net income attributable to Dominion Energy 0.77 0.69 1.31 0.97 Diluted EPS: Net income attributable to Dominion Energy 0.77 0.69 1.30 0.97 Dividends declared per common share 0.835 0.835 0.835 0.835
Virginia Electric and Power Company
Quarterly Financial Data	Virginia Power’s quarterly results of operations were as follows: First Second Third Fourth (millions) 2019 Operating revenue $ 1,965 $ 1,938 $ 2,264 $ 1,941 Income from operations 122 238 820 659 Net income 20 100 602 427 2018 Operating revenue $ 1,748 $ 1,829 $ 2,232 $ 1,810 Income from operations 364 533 756 418 Net income 184 339 520 239
Dominion Energy Gas Holdings, LLC
Quarterly Financial Data	Dominion Energy Gas’ quarterly results of operations were as follows: First Second Third Fourth (millions) 2019 Operating revenue $566 $530 $502 $571 Income from continuing operations 247 179 202 276 Net income from continuing operations 172 123 130 276 Net income from discontinued operations 54 26 45 16 Net income including noncontrolling interests 226 149 175 292 Net income attributable to 190 119 151 261 2018 Operating revenue $389 $508 $533 $566 Income from continuing operations 167 90 302 228 Net income from continuing operations 157 84 209 182 Net income (loss) from discontinued operations 56 45 33 (110 ) Net income including noncontrolling interests 213 129 242 72 Net income attributable to Dominion Energy Gas 180 83 191 27

Nature of Operations (Narrative

Nature of Operations (Narrative) (Detail)	Dec. 31, 2019
White Rive Hub [Member]
Subsidiary, Sale of Stock [Line Items]
Minority Interest Ownership Percentage By Parent	50.00%

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)	May 31, 2019USD ($)	Mar. 31, 2019USD ($)FacilityMW	Jan. 31, 2019USD ($)	Dec. 31, 2018USD ($)MWh	Dec. 31, 2019USD ($)MWh		Dec. 31, 2018USD ($)MWh$ / shares	Dec. 31, 2017USD ($)	Jan. 01, 2019USD ($)
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					$ 626	$ 896		$ 626
Percentage of fuel currently subject to deferred fuel accounting						84.00%
Federal statutory income tax rate						21.00%		21.00%	35.00%
Recognized interest income									$ 11
Margin deposit assets					$ 95	$ 42		$ 95
Margin liabilities						2
Capitalized interest costs and Capitalized interest costs and AFUDC						89		134	236
Impairment of assets and other charges						$ 1,535		$ 403	15
Estimated proved developed or proved gas and oil reserves rate per unit | MWh					1.89	1.80		1.89
Unrealized gains reclassified from AOCI to retained earnings					$ 1,100			$ 1,100
Unrealized gains reclassified from AOCI to retained earnings after-tax								734
Net unrealized gains on equity securities previously classified as cost method investments					36			36
Net unrealized gains on equity securities previously classified as cost method investments, after tax								22
Net unrealized losses in other income								190
Net unrealized losses in other income, after tax								$ 142
Gain per share from unrealized loss on securities | $ / shares								$ 0.22
Operating lease assets						$ 499	[1]			$ 504
Operating lease liabilities						$ 478
Tax reform, reclassification of tax benefit from AOCI to retained earnings								$ 289
Finite Lived Intangible Asset Useful Life						30 years
Accounting Standards Update 2014-09 [Member] | Cumulative Effect Of Changes In Accounting Principle [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interests					3			3
Accounting Standards Update 2017-05 [Member] | Cumulative Effect Of Changes In Accounting Principle [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interests						$ 127
Current Regulatory Liabilities [Member]
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments						33
Retained Earnings
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments						$ 3
Maximum [Member]
Significant Accounting Policies [Line Items]
Margin liabilities					1			$ 1
Lessee Operating Lease Renewal Term						70 years
Maximum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						50 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Lessee Operating Lease Renewal Term						1 year
Minimum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						3 years
Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase (decrease) in EPS | $ / shares								$ 0.07
Change in Estimated Useful Life [Member] | Merchant generation assets
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense								$ (30)	26
Increase (decrease) in depreciation expense, after tax								(23)	16
Performing Processing And Fractionation Services [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Other energy-related purchases								107
Transportation And Storage Arrangements [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Purchased gas									$ 111
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					392	$ 512		$ 392
Federal statutory income tax rate						21.00%		21.00%	35.00%
Recognized interest income									$ 11
Margin deposit assets					0			$ 0
Margin liabilities					0	$ 0		0
Capitalized interest costs and Capitalized interest costs and AFUDC						34		56	37
AFUCD recorded as regulatory asset					4	11		4	22
Impairment of assets and other charges				$ 160		757
Asset Impairment Charges After Tax				$ 119
Unrealized gains reclassified from AOCI to retained earnings					119			119
Unrealized gains reclassified from AOCI to retained earnings after-tax								73
Net unrealized losses in other income								24
Net unrealized losses in other income, after tax								18
Operating lease assets						212	[1]			209
Operating lease liabilities						187
Tax reform, reclassification of tax benefit from AOCI to retained earnings								3
MW capacity | MW			1,292
Number Of Facilities In Cold Reserve Units Retired | Facility			6
Virginia Electric and Power Company | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					36	35		36
Virginia Electric and Power Company | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	$ 17	$ 62	$ 346
Asset Impairment Charges After Tax	12	$ 46	$ 257
Virginia Electric and Power Company | Maximum [Member]
Significant Accounting Policies [Line Items]
Margin deposit assets						1
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense								60	(40)
Increase (decrease) in depreciation expense, after tax								(44)	$ 25
Virginia Electric and Power Company | Federal | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					34	15		34
Virginia Electric and Power Company | State | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					2	20		2
Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					101	$ 104		$ 101
Federal statutory income tax rate						21.00%		21.00%	35.00%
Margin deposit assets					0	$ 0		$ 0
Margin liabilities					0			0
Capitalized interest costs and Capitalized interest costs and AFUDC						31		25	$ 34
Impairment of assets and other charges					219	13		163	15
Inventory under LIFO method					12	19		12
Amount exceeded on LIFO basis					87	60		87
Operating lease assets						37	[1]			$ 64
Operating lease liabilities						35
Tax reform, reclassification of tax benefit from AOCI to retained earnings								26
Dominion Energy Gas Holdings, LLC | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable						$ 209
Receivable from affiliate					271			271
Dominion Energy Gas Holdings, LLC | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	26
Dominion Energy Gas Holdings, LLC | Maximum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						40 years
Dominion Energy Gas Holdings, LLC | Transportation And Storage Arrangements [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Purchased gas									$ 71
Dominion Energy Gas Holdings, LLC | Federal
Significant Accounting Policies [Line Items]
Federal income taxes receivable					277			277
Dominion Energy Gas Holdings, LLC | Federal | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					6	$ 212		6
Dominion Energy Gas Holdings, LLC | State
Significant Accounting Policies [Line Items]
Noncurrent income taxes receivable					$ 15	10		$ 15
Dominion Energy Gas Holdings, LLC | State | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable						3
Dominion Energy Gas Holdings, LLC | Discontinued Operations [Member]
Significant Accounting Policies [Line Items]
Operating lease assets						25
Operating lease liabilities						$ 25
Dominion Energy | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Asset Impairment Charges After Tax	$ 19
Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						50.00%
Terra Nova Renewable Partners | Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners						33.00%
Dominion Energy Midstream Partners, LP
Significant Accounting Policies [Line Items]
Federal statutory income tax rate								21.00%	35.00%
Dominion Energy Midstream Partners, LP | Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Percentage ownership in total units						25.00%
Merchant Solar Projects | Dominion Energy Midstream Partners, LP | Call Option
Significant Accounting Policies [Line Items]
Percentage ownership in total units						67.00%
[1]	Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.

Significant Accounting Polici_5

Significant Accounting Policies (Checks the Outstanding Accounts Payable but not yet Presented for Payment and Recorded) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable [Line Items]
Accounts payable for checks outstanding	$ 29	$ 35
Virginia Electric and Power Company
Accounts Payable [Line Items]
Accounts payable for checks outstanding	9	16
Dominion Energy Gas Holdings, LLC
Accounts Payable [Line Items]
Accounts payable for checks outstanding	$ 6	$ 7

Significant Accounting Polici_6

Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		$ 166		$ 268	$ 120		$ 261
Restricted cash and equivalents	[1]	103		123	65		61
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		269		391	185		322
Virginia Electric and Power Company
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		17		29	14		11
Restricted cash and equivalents	[1]	7		9	10
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		24		38	24		11
Dominion Energy Gas Holdings, LLC
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		27	[2]	99	18	[2]	76	[2]
Restricted cash and equivalents	[1]	12		90	39		45
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		$ 39		$ 198	$ 57		$ 121
[1]	Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[2]	At December 31, 2018, 2017 and 2016, Dominion Energy Gas had $9 million, $3 million and $14 million of cash and cash equivalents included in current assets of discontinued operations, respectively.

Significant Accounting Polici_7

Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dominion Energy Gas Holdings, LLC
Cash, restricted cash and equivalents classified as discontinued operations	$ 9	$ 3	$ 14

Significant Accounting Polici_8

Significant Accounting Policies (Depreciation Rates and Estimated Useful Life) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Merchant Generation Nuclear
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	44 years
LNG Facility [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Minimum | Merchant Generation-Other
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Minimum | Nonutility Gas Gathering and Processing
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Minimum | General and Other
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Maximum | Merchant Generation-Other
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Maximum | Nonutility Gas Gathering and Processing
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	50 years
Maximum | Nonutility Gas Gathering and Processing | Dominion Energy Gas Holdings, LLC
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Maximum | General and Other
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	59 years
Generation
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.84%	2.71%	2.94%
Generation | Virginia Electric and Power Company
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.94%	2.71%	2.94%
Transmission
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.47%	2.54%	2.55%
Transmission | Virginia Electric and Power Company
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.54%	2.52%	2.54%
Transmission | Dominion Energy Gas Holdings, LLC
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.43%	2.66%	2.67%
Distribution
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.80%	2.97%	3.00%
Distribution | Virginia Electric and Power Company
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	3.14%	3.31%	3.32%
Storage
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.40%	2.40%	2.48%
Storage | Dominion Energy Gas Holdings, LLC
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	2.53%	2.42%	2.51%
General and Other
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	4.04%	4.20%	4.38%
General and Other | Virginia Electric and Power Company
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	4.40%	4.52%	4.68%
General and Other | Dominion Energy Gas Holdings, LLC
Public Utility, Property, Plant and Equipment [Line Items]
Average composite depreciation rates on utility property, plant and equipment (percentage)	4.59%	4.18%	5.08%

Acquisitions and Dispositions_2

Acquisitions and Dispositions (Acquisition Of Scana) (Narrative) (Detail) - USD ($) $ in Millions	Sep. 16, 2016	Jan. 31, 2019	Oct. 31, 2017	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Business Acquisition And Dispositions [Line Items]
Stock issued during period for acquisition, value		$ 1,600											$ 6,818
Regulatory Liabilities				$ 11,498					$ 7,196				11,498		$ 7,196
Regulatory liabilities-current				497					356				497		356
After tax charge in statements of income				1,009		$ 975	$ 54	$ (680)	$ 641	$ 854	$ 449	$ 503	1,358		$ 2,447	$ 2,999
SCANA
Other Commitment, Fiscal Year Maturity [Abstract]
Charitable contributions, annual committed increase for next five years													$ 1
SCANA | Minimum
Other Commitment, Fiscal Year Maturity [Abstract]
Charitable contributions, period committed for annual increase	5 years
SCANA
Business Acquisition And Dispositions [Line Items]
Stock issued during period for acquisition, shares		95,600,000											95,600,000
Stock issued during period for acquisition, value		$ 6,800											$ 6,800
Common stock agreed to issue		0.669%
Total outstanding debt		$ 6,900		6,707									6,707
Business combination, refund to customers		$ 2,000
Period to provide refund to customer		20 years	20 years					11 years
Regulatory Liabilities			$ 1,100
Regulatory liabilities-current			67					$ 137
Refund Liability to electric service customers			1,000
Reduction in operating revenue								$ 1,000
After tax charge in statements of income													756
Business combination cost related to exclusion from rate recovery		$ 2,400
Remaining regulatory asset		2,800		$ 3,940	[1]								$ 3,940	[1]
Remaining regulatory asset current		138
SCANA | Toshiba Corporation
Business Acquisition And Dispositions [Line Items]
Cash consideration			$ 1,100
SCANA | Columbia Energy
Business Acquisition And Dispositions [Line Items]
Business combination cost related to exclusion from rate recovery		$ 180
[1]	Includes $258 million of certain income tax-related regulatory assets associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. See Note 5 for additional information.

Acquisitions and Dispositions_3

Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	[1]	$ 8,946			$ 6,410	$ 6,405
SCANA
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Total current assets	[2]	1,782
Investments	[3]	224
Property, plant and equipment, net	[4],[5]	11,006
Goodwill		2,609
Regulatory assets		3,940	[6]	$ 2,800
Other deferred charges and other assets, including intangible assets	[7]	430
Total Assets		19,991
Total current liabilities	[8]	1,556
Long-term debt		6,707		$ 6,900
Deferred income taxes		1,068
Regulatory liabilities		2,706
Other deferred credits and other liabilities	[9]	1,115
Total Liabilities		13,152
Total purchase price	[10]	$ 6,839
[1]	Goodwill amounts do not contain any accumulated impairment losses.
[2]	Includes $389 million of cash, restricted cash and equivalents, of which $115 million is considered restricted.
[3]	Includes $31 million for equity method investments. The fair value adjustment on the equity method investments is considered to be equity method goodwill and is not amortized.
[4]	Includes $105 million of certain property, plant and equipment associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. As a result, Dominion Energy’s Consolidated Statements of Income for the year ended December 31, 2019 include a charge of $105 million ($79 million after-tax), included in impairment of assets and other charges (reflected in the Corporate and Other segment).
[5]	Nonregulated property, plant and equipment, excluding land, will be depreciated on a straight-line basis over the remaining useful lives of such property, primarily ranging from 5 to 78 years.
[6]	Includes $258 million of certain income tax-related regulatory assets associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. See Note 5 for additional information.
[7]	Intangible assets have an estimated weighted-average amortization period of approximately five years.
[8]	Includes $40 million outstanding under letters of credit advances, which were repaid in January 2019, as well as $173 million outstanding commercial paper under various credit facilities. As discussed in Note 17, all credit facilities were terminated in 2019.
[9]	Includes a $379 million pension and other postretirement benefit liability.
[10]	Includes stock-based compensation awards with a fair value of $21 million.

Acquisitions and Dispositions_4

Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Parenthetical) (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash, restricted cash and equivalents		$ 269	$ 391	$ 185	$ 322
Pension and other postretirement benefit liability		2,366	2,328
Impairment of assets and other charges		$ 1,535	$ 403	$ 15
Intangible assets, estimated weighted-average amortization period		10 years
SCANA
Business Acquisition [Line Items]
Equity method investment		$ 31
Cash, restricted cash and equivalents		389
Restricted cash		115
Income tax regulatory assets		258
Pension and other postretirement benefit liability		379
Stock based compensation awards estimated fair value		$ 21
Repayment of letter of credit advances	$ 40
Repayments of Commercial Paper	$ 173
Intangible assets, estimated weighted-average amortization period		5 years
SCANA | Minimum
Business Acquisition [Line Items]
Property, plant and equipment, estimated useful lives		5 years
SCANA | Maximum
Business Acquisition [Line Items]
Property, plant and equipment, estimated useful lives		78 years
SCANA | Dominion Energy | Property plant and equipment committed to forgo recovery
Business Acquisition [Line Items]
Property, plant and equipment with NND project		$ 105
Impairment of assets and other charges		105
Asset impairment charges, after tax		$ 79

Acquisitions and Dispositions_5

Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - SCANA - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Operating Revenue	[1]	$ 17,579	$ 17,505
Net income attributable to Dominion Energy	[1]	$ 3,266	$ 2,081
Earnings Per Common Share - Basic	[1]	$ 4.04	$ 2.78
Earnings Per Common Share - Diluted	[1]	$ 4	$ 2.77
[1]	Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.

Acquisitions and Dispositions_6

Acquisitions and Dispositions (Sale of Interest in Cove Point) (Narrative) (Detail) - USD ($) $ in Billions	1 Months Ended
	Dec. 31, 2019	Oct. 31, 2019	Dec. 31, 2018
Business Acquisition And Dispositions [Line Items]
Cash consideration from sale of noncontrolling interest	$ 2.1
Cove Point [Member]
Business Acquisition And Dispositions [Line Items]
Ownership interest percentage of limited partner interests		25.00%	25.00%
Cash consideration from sale of noncontrolling interest		$ 2.1

Acquisitions and Dispositions_7

Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - SCANA [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Increase in operating revenue		$ 3,100
Decrease in net income		(1,100)
Merger and integration-related costs	$ 1,300	484
Dominion Energy [Member]
Business Acquisition [Line Items]
Merger and integration-related costs		646	$ 27
Dominion Energy [Member] | Voluntary Retirement Program [Member]
Business Acquisition [Line Items]
Merger and integration-related costs		427
Dominion Energy [Member] | Other operations and maintenance
Business Acquisition [Line Items]
Merger and integration-related costs		210
Dominion Energy [Member] | Interest And Related Charges
Business Acquisition [Line Items]
Merger and integration-related costs		$ 9

Acquisitions and Dispositions_8

Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Detail) $ in Millions		1 Months Ended						12 Months Ended
		Oct. 31, 2017USD ($)ProjectMW	Sep. 30, 2017USD ($)ProjectMW	Jun. 30, 2017USD ($)ProjectMW	May 31, 2017USD ($)ProjectMW	Mar. 31, 2017USD ($)ProjectMW	Feb. 28, 2017USD ($)ProjectMW	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Project Cost								$ 341	$ 151	$ 405
Community Energy Solar, Inc
Business Acquisition [Line Items]
Number of Projects | Project							1
Total consideration	[1]						$ 29
Project Cost	[2]						$ 205
MW capacity | MW							100
Solar Frontier Americas Holding, LLC
Business Acquisition [Line Items]
Number of Projects | Project	[3]					1
Total consideration	[1]					$ 77
Project Cost	[2]					$ 78
MW capacity | MW						30
Cypress Creek Renewables, LLC
Business Acquisition [Line Items]
Number of Projects | Project					1
Total consideration	[1]				$ 154
Project Cost	[2]				$ 160
MW capacity | MW					79
Hecate Energy Virginia C&C LLC
Business Acquisition [Line Items]
Number of Projects | Project			1	1
Total consideration	[1]		$ 40	$ 16
Project Cost	[2]		$ 41	$ 16
MW capacity | MW			20	10
Strata Solar Development, LLC/Moorings Farm 2 Holdco, LLC
Business Acquisition [Line Items]
Number of Projects | Project				2
Total consideration	[1]			$ 20
Project Cost	[2]			$ 20
MW capacity | MW				10
Strata Solar Development, LLC
Business Acquisition [Line Items]
Number of Projects | Project		2
Total consideration	[1]	$ 20
Project Cost	[2]	$ 21
MW capacity | MW		10
[1]	The purchase price was primarily allocated to property, plant and equipment.
[2]	Includes acquisition cost.
[3]	In April 2017, Dominion Energy discontinued efforts on the acquisition of the additional 20 MW solar project from Solar Frontier Americas Holding LLC.

Acquisitions and Dispositions_9

Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Parenthetical) (Detail)	1 Months Ended
	Apr. 30, 2017MW
Business Combinations Discontinued Operations And Disposal Groups [Abstract]
Discontinued efforts on acquisition of additional MW capacity	20

Acquisitions and Disposition_10

Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)ProjectMW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Project Cost	$ 341	$ 151	$ 405
Solar Development Projects
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired				100.00%
Number of Projects | Project				7
Aggregate purchase price				$ 32
Project Cost				$ 421
MW capacity | MW				221

Acquisitions and Disposition_11

Acquisitions and Dispositions (Dominion Energy Gas Restructuring) (Narrative) (Detail)	Dec. 31, 2019
Cove Point
Business Acquisition And Dispositions [Line Items]
Percentage Of Controlling Ownership	75.00%
White River Hub
Business Acquisition And Dispositions [Line Items]
Minority Interest Ownership Percentage By Parent	50.00%
Iroquois
Business Acquisition And Dispositions [Line Items]
Minority Interest Ownership Percentage By Parent	25.93%
Cove Point
Business Acquisition And Dispositions [Line Items]
Minority Interest Ownership Percentage By Parent	25.00%

Acquisitions and Disposition_12

Acquisitions and Dispositions (Schedule of Results of Operations Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions	Nov. 06, 2019	Dec. 31, 2018	Dec. 31, 2017
East Ohio
Business Acquisition [Line Items]
Operating revenue	$ 594	$ 729	$ 728
Depreciation and amortization	73	76	71
Other operating expenses	399	444	428
Other income	61	72	50
Interest and related charges	33	37	33
Income tax expense (benefit)	26	53	86
Net income (loss) from discontinued operations	124	191	160
DGP
Business Acquisition [Line Items]
Operating revenue	125	220	114
Depreciation and amortization	4	15	15
Impairment of assets and other charges		219
Other operating expenses	97	206	91
Income tax expense (benefit)	7	(53)	5
Net income (loss) from discontinued operations	$ 17	$ (167)	$ 3

Acquisitions and Disposition_13

Acquisitions and Dispositions (Schedule of Major Classes of Assets and Liabilities Reported As Discontinued Operation) (Detail) $ in Millions	Dec. 31, 2018USD ($)
East Ohio
Business Acquisition [Line Items]
Current assets of discontinued operations	$ 423	[1]
Investments	2
Property, plant and equipment, net	3,669
Regulatory assets	711
Other deferred charges and other assets, including goodwill and intangible assets	1,275
Noncurrent assets of discontinued operations	5,657
Current liabilities of discontinued operations	1,262
Long-term debt	1,300
Deferred income taxes and investment tax credits	716
Regulatory liabilities	747
Other deferred credits and other liabilities	108
Noncurrent liabilities of discontinued operations	2,871
DGP
Business Acquisition [Line Items]
Current assets of discontinued operations	21	[2],[3]
Noncurrent assets of discontinued operations	192	[4]
Current liabilities of discontinued operations	11
Noncurrent liabilities of discontinued operations	$ 25
[1]	Includes cash and cash equivalents of $9 million as of December 31, 2018.
[2]	Includes cash and cash equivalents of less than $1 million.
[3]	Includes cash and cash equivalents of less than a million dollars as of December 31, 2018.
[4]	Primarily property, plant and equipment, net.

Acquisitions and Disposition_14

Acquisitions and Dispositions (Schedule of Major Classes of Assets and Liabilities Reported As Discontinued Operation) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
East Ohio
Business Acquisition [Line Items]
Cash, restricted cash and equivalents of discontinued operations	$ 9
DGP
Business Acquisition [Line Items]
Cash, restricted cash and equivalents of discontinued operations	cash and cash equivalents of less than $1 million.

Acquisitions and Disposition_15

Acquisitions and Dispositions (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		Nov. 06, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant noncash items
Charge related to a voluntary retirement program			$ 213	$ 119
Accrued capital expenditures	[1],[2],[3],[4],[5]		$ 555	307	$ 343
East Ohio
Business Acquisition [Line Items]
Capital expenditures		$ 299		352	348
Significant noncash items
Charge related to a voluntary retirement program		20		0		$ 0
Accrued capital expenditures		2		5	8
DGP
Business Acquisition [Line Items]
Capital expenditures		11		6	8
Significant noncash items
Impairment of assets and related charges		$ 0		$ (219)	$ 0
[1]	See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.
[2]	See Note 3 for noncash investing and financing activities related to the SCANA Combination.
[3]	See Note 5 for noncash activities related to the sale of a noncontrolling interest in Cove Point.
[4]	See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler.
[5]	See Notes 18,19 and 20 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream, the remarketing of RSNs, the issuance of stock purchase contracts associated with the 2019 Equity Units and the contribution of stock to Dominion Energy’s qualified defined benefit pension plan.

Operating Revenue (Schedule of

Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - Adjustments for New Accounting Pronouncement - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Public Utilities General Disclosures [Line Items]
Operating revenue		$ 15,764	$ 12,895
Operating revenue		16,572	13,366
Other
Public Utilities General Disclosures [Line Items]
Operating revenue		4
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue		4,325	3,413
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue		3,219	2,503
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue		683	490
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue		873	854
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue		176	137
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue		926	1,294
Other
Public Utilities General Disclosures [Line Items]
Operating revenue	[1],[2]	808	471
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue		1,343	818
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue		457	221
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue		117	36
Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue		496	214
Regulated Gas Transportation and Storage | FERC-regulated
Public Utilities General Disclosures [Line Items]
Operating revenue		1,057	1,091
Regulated Gas Transportation and Storage | State-regulated
Public Utilities General Disclosures [Line Items]
Operating revenue		742	640
Nonregulated Gas Transportation And Storage
Public Utilities General Disclosures [Line Items]
Operating revenue		676	442
Other Regulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue		259	179
Other Nonregulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue	[1],[3]	415	563
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue		8,036	7,584
Operating revenue		8,108	7,619
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue		3,657	3,413
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue		2,712	2,503
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue		455	490
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue		823	854
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue		128	137
Virginia Electric and Power Company | Other
Public Utilities General Disclosures [Line Items]
Operating revenue	[2],[3]	72	35
Virginia Electric and Power Company | Other Regulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue		190	132
Virginia Electric and Power Company | Other Nonregulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue	[1],[3]	71	55
Dominion Energy Gas Holdings, LLC
Public Utilities General Disclosures [Line Items]
Operating revenue		2,165	2,002
Operating revenue		2,169	1,996
Dominion Energy Gas Holdings, LLC | Other
Public Utilities General Disclosures [Line Items]
Operating revenue			(6)
Dominion Energy Gas Holdings, LLC | Regulated Gas Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue		9	25
Dominion Energy Gas Holdings, LLC | Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue	[3]	6	7
Dominion Energy Gas Holdings, LLC | Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue		1,300	1,249
Dominion Energy Gas Holdings, LLC | Nonregulated Gas Transportation And Storage
Public Utilities General Disclosures [Line Items]
Operating revenue		676	442
Dominion Energy Gas Holdings, LLC | Management Service Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue	[3]	162	257
Dominion Energy Gas Holdings, LLC | Other Regulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue	[1],[3]	7	19
Dominion Energy Gas Holdings, LLC | Other Nonregulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue	[1],[3]	$ 5	$ 3
[1]	Amounts above include sales which are considered to be goods transferred at a point in time. For the years ended December 31, 2019 and 2018, such amounts included $171 million and $241 million, respectively, at Dominion Energy and $5 million and $10 million, respectively, at Dominion Energy Gas, primarily consisting of NGL sales. Additionally, amounts above include sales of renewable energy credits. For the years ended December 31, 2019 and 2018, such sales were $24 million and $ 17 million, respectively, at Dominion Energy and $17 million and $11 million, respectively, at Virginia Power.
[2]	Includes alternative revenue of $66 million and $52 million for the year ended December 31, 2019 at Dominion Energy and Virginia Power, respectively, and $15 million for year ended December 31, 2018 at both Dominion Energy and Virginia Power.
[3]	See Notes 9 and 25 for amounts attributable to related parties and affiliates.

Operating Revenue (Schedule o_2

Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Public Utilities General Disclosures [Line Items]
Alternative revenue	$ 66	$ 15
NGL Midstream
Public Utilities General Disclosures [Line Items]
Sales revenue	171	241
Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Sales revenue	24	17
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Alternative revenue	52	15
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Sales revenue	17	11
Dominion Energy Gas Holdings, LLC | NGL Midstream
Public Utilities General Disclosures [Line Items]
Sales revenue	$ 5	$ 10

Operating Revenue (Schedule o_3

Operating Revenue (Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 19,241
Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	4
Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	20,135
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,569
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 3
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,723
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,470
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,624
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,363
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 0
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,495
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,216
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 0
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,325
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,104
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 0
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,185
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 12,519
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01 | Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 0
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01 | Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 12,783
Revenue, expected to be recognized on multi-year contracts, period	1 year

Operative Revenue (Narrative) (

Operative Revenue (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues From Contract With Customer [Line Items]
Contract asset balances	$ 28	$ 42
Contract liability balances	123	106
Revenue recognized from contract liability balances	94
Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Contract asset balances	40	58
Contract liability balances	20	28
Revenue recognized from contract liability balances	8	3
Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Contract liability balances	24	22
Revenue recognized from contract liability balances	$ 22	$ 25

Operating Revenue (Schedule o_4

Operating Revenue (Schedule of Operating Revenue Prior to Revised Guidance of Revenue Recognition From Contracts with Customers) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Public Utilities General Disclosures [Line Items]
Total operating revenue	$ 4,475	$ 4,269	$ 3,970	$ 3,858	$ 3,361	$ 3,451	$ 3,088	$ 3,466	$ 16,572	[1]	$ 13,366	[1]	$ 12,586	[1]
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total operating revenue	1,941	2,264	1,938	1,965	1,810	2,232	1,829	1,748	8,108	[2]	7,619	[2]	7,556	[2]
Dominion Energy Gas Holdings, LLC
Public Utilities General Disclosures [Line Items]
Total operating revenue	$ 571	$ 502	$ 530	$ 566	$ 566	$ 533	$ 508	$ 389	$ 2,169	[3]	$ 1,996	[3]	1,523	[3]
Prior to adoption of revised guidance
Public Utilities General Disclosures [Line Items]
Nonregulated electric sales													1,429
Regulated gas sales													1,067
Nonregulated gas sales													457
Total operating revenue													12,586
Prior to adoption of revised guidance | Regulated Electric Sales
Public Utilities General Disclosures [Line Items]
Revenue													7,383
Prior to adoption of revised guidance | Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Revenue													1,786
Prior to adoption of revised guidance | Other
Public Utilities General Disclosures [Line Items]
Revenue													464
Prior to adoption of revised guidance | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total operating revenue													7,556
Prior to adoption of revised guidance | Virginia Electric and Power Company | Regulated Electric Sales
Public Utilities General Disclosures [Line Items]
Revenue													7,383
Prior to adoption of revised guidance | Virginia Electric and Power Company | Other
Public Utilities General Disclosures [Line Items]
Revenue													173
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC
Public Utilities General Disclosures [Line Items]
Regulated gas sales													6
Nonregulated gas sales													6
Total operating revenue													1,523
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Revenue													1,291
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Other
Public Utilities General Disclosures [Line Items]
Revenue													$ 220
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to affiliates.
[3]	See Note 25 for amounts attributable to related parties.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Detail) - USD ($) $ in Millions		1 Months Ended	10 Months Ended	12 Months Ended
		Jun. 30, 2017	Oct. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Federal statutory income tax rate				21.00%	21.00%	35.00%
State deferred income tax expense				$ (93)	$ (1)	$ 132
Current federal income taxes				135	63	(27)
Taxes charged to common shareholders' equity				215
Deferred income tax expense	[1]				46	(851)
Increase (Decrease) to deferred income tax expense					23
Increase (Decrease) in regulatory liabilities					35	4,200
Decrease in unrecognized tax benefits due to settlement				7	6	23
Unrecognized tax benefits that would impact effective tax rate				141	37	31
Decrease in accumulated deferred income tax liability						3,100
Increase (decrease) in deferred tax asset						1,100
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits				3	5	(9)
Operating Loss Carryforwards				4,435
Income tax expense (benefit)				351	580	(30)
Deferred tax liabilities noncurrent				6,277	5,116
Regulatory liability noncurrent				11,001	6,840
Dominion Cove Point L N G L P [Member]
Income Taxes [Line Items]
Current federal income taxes				362
Benefit for deferred income taxes				147
Federal tax credits				$ 208
Ownership interest percentage of limited partner interests				25.00%
SCANA
Income Taxes [Line Items]
Deferred income tax expense				$ 194
Noncurrent Liabilities [Member]
Income Taxes [Line Items]
Increase (Decrease) in regulatory liabilities					$ 23
Discontinued Operations [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			$ 33			5
Deferred tax liabilities noncurrent						$ 0.4
Carryback claim for specified liability losses involving prior tax years
Income Taxes [Line Items]
Current federal income taxes				47
Maximum
Income Taxes [Line Items]
State deferred income tax expense				1
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations				86
Amount that earnings could potentially increase if changes were to occur				23
Federal
Income Taxes [Line Items]
Operating Loss Carryforwards				$ 1,361
Virginia Electric and Power Company
Income Taxes [Line Items]
Federal statutory income tax rate				21.00%	21.00%	35.00%
State deferred income tax expense				$ 22	$ 55	$ 59
Current federal income taxes				344	76	505
Deferred income tax expense	[1]			0	21	(93)
Increase (Decrease) to deferred income tax expense					23
Increase (Decrease) in regulatory liabilities					31	2,600
Decrease in unrecognized tax benefits due to settlement		$ 8		2	1	8
Unrecognized tax benefits that would impact effective tax rate		2		1	2	3
Interest income		$ 11
Decrease in accumulated deferred income tax liability						1,900
Increase (decrease) in deferred tax asset						700
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits				(2)		(6)
Income tax expense (benefit)				264	300	$ 774
Deferred tax liabilities noncurrent				2,962	3,017
Regulatory liability noncurrent				$ 5,074	$ 4,647
Dominion Energy Gas Holdings, LLC
Income Taxes [Line Items]
Federal statutory income tax rate				21.00%	21.00%	35.00%
State deferred income tax expense				$ (10)	$ (17)	$ 5
Current federal income taxes				147	(196)	88
Deferred income tax expense	[1]				(6)	(246)
Increase (Decrease) to deferred income tax expense					(5)
Increase (Decrease) in regulatory liabilities					(8)	1,100
Decrease in unrecognized tax benefits due to settlement				0	0	7
Decrease in accumulated deferred income tax liability						800
Increase (decrease) in deferred tax asset						300
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits					(1)	(5)
Operating Loss Carryforwards				1
Income tax expense (benefit)				101	124	(65)
Deferred tax liabilities noncurrent				1,288	1,330
Regulatory liability noncurrent				800	765
Dominion Energy Gas Holdings, LLC | Discontinued Operations [Member]
Income Taxes [Line Items]
Increase (Decrease) to deferred income tax expense					8
Increase (Decrease) in regulatory liabilities					10
Income tax expense (benefit)					91
Deferred tax liabilities noncurrent						0.1
Regulatory liability noncurrent						0.5
Dominion Energy Gas Holdings, LLC | Maximum
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate				2	2	$ 2
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations				1
Amount that earnings could potentially increase if changes were to occur				1
Dominion Energy Gas Holdings, LLC | Maximum | Discontinued Operations [Member]
Income Taxes [Line Items]
Income tax expense (benefit)					$ 1
Dominion Energy Gas Holdings, LLC | Federal
Income Taxes [Line Items]
Deferred income tax expense				$ 48
[1]	The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal		$ 32	$ (45)	$ (1)
State		103	108	(26)
Total current expense (benefit)		135	63	(27)
Deferred:
2017 Tax Reform Act impact	[1]		46	(851)
Taxes before operating loss carryforwards, investment tax credits and tax reform		182	436	739
Tax utilization expense (benefit) of operating loss carryforwards		119	92	174
Investment tax credits		(51)	(56)	(200)
State		(93)	(1)	132
Total deferred expense (benefit)		157	517	(6)
Investment tax credit-gross deferral		62	2	5
Investment tax credit-amortization		(3)	(2)	(2)
Total income tax expense (benefit)		351	580	(30)
Virginia Electric and Power Company
Current:
Federal		286	36	432
State		58	40	73
Total current expense (benefit)		344	76	505
Deferred:
2017 Tax Reform Act impact	[1]	0	21	(93)
Taxes before operating loss carryforwards, investment tax credits and tax reform		(128)	199	319
Tax utilization expense (benefit) of operating loss carryforwards		0	0	4
Investment tax credits		(34)	(51)	(23)
State		22	55	59
Total deferred expense (benefit)		(140)	224	266
Investment tax credit-gross deferral		62	2	5
Investment tax credit-amortization		(2)	(2)	(2)
Total income tax expense (benefit)		264	300	774
Dominion Energy Gas Holdings, LLC
Current:
Federal		130	(227)	75
State		17	31	13
Total current expense (benefit)		147	(196)	88
Deferred:
2017 Tax Reform Act impact	[1]		(6)	(246)
Taxes before operating loss carryforwards, investment tax credits and tax reform		(36)	343	88
Tax utilization expense (benefit) of operating loss carryforwards		0	0	0
Investment tax credits		0	0	0
State		(10)	(17)	5
Total deferred expense (benefit)		(46)	320	(153)
Investment tax credit-gross deferral		0	0	0
Investment tax credit-amortization		0	0	0
Total income tax expense (benefit)		$ 101	$ 124	$ (65)
[1]	The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

Income Taxes (Income Tax Expe_2

Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Parenthetical) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Tax Reform Act Expense	[1]		$ 46	$ (851)
Dominion Energy Gas Holdings, LLC
Income Tax Contingency [Line Items]
Tax Reform Act Expense	[1]		(6)	$ (246)
Discontinued Operations [Member] | Dominion Energy Gas Holdings, LLC
Income Tax Contingency [Line Items]
Tax Reform Act Expense		$ 93	$ 8
[1]	The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Computation [Line Items]
U.S. statutory rate		21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit		1.30%	3.00%	2.00%
Investment tax credits		(5.70%)	(1.90%)	(6.30%)
Production tax credits		(1.10%)	(0.70%)	(0.70%)
Valuation allowances		0.10%	0.30%	0.20%
Reversal of excess deferred income taxes		(2.00%)	(2.00%)	0.00%
Federal legislative change		0.00%	1.50%	(27.50%)
State legislative change		0.00%	(0.60%)	0.00%
Write-off of regulatory assets		10.90%	0.00%	0.00%
Change in tax status		(2.80%)	0.00%	0.00%
AFUDC-equity		(1.80%)	(0.80%)	(1.40%)
Employee stock ownership plan deduction		(0.70%)	(0.40%)	(0.60%)
Other, net		1.10%	(0.90%)	(1.70%)
Effective tax rate		20.30%	18.50%	(1.00%)
Virginia Electric and Power Company
Effective Income Tax Computation [Line Items]
U.S. statutory rate		21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit		4.50%	4.70%	3.70%
Investment tax credits		(2.90%)	(3.50%)	(0.80%)
Production tax credits		(0.70%)	(0.70%)	(0.40%)
Valuation allowances		0.00%	0.00%	0.00%
Reversal of excess deferred income taxes		(3.10%)	(3.20%)	0.00%
Federal legislative change		0.00%	1.30%	(4.00%)
State legislative change		0.00%	0.00%	0.00%
Write-off of regulatory assets		0.00%	0.00%	0.00%
Change in tax status		0.00%	0.00%	0.00%
AFUDC-equity		0.00%	(0.50%)	(0.60%)
Employee stock ownership plan deduction		0.00%	0.00%	0.00%
Other, net		(0.20%)	(0.10%)	0.60%
Effective tax rate		18.60%	19.00%	33.50%
Dominion Energy Gas Holdings, LLC
Effective Income Tax Computation [Line Items]
U.S. statutory rate		21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit		2.50%	3.20%	2.60%
Investment tax credits		0.00%	0.00%	0.00%
Production tax credits		0.00%	0.00%	0.00%
Valuation allowances		(0.20%)	0.00%	0.30%
Reversal of excess deferred income taxes		(0.80%)	(0.60%)	0.00%
Federal legislative change		0.00%	(0.50%)	(41.00%)
State legislative change		0.00%	(2.00%)
Write-off of regulatory assets		0.00%	0.00%	0.00%
Change in tax status		(6.00%)	0.00%	0.00%
AFUDC-equity		(0.50%)	(0.30%)	(0.90%)
Employee stock ownership plan deduction		0.00%	0.00%	0.00%
Other, net	[1]	(3.40%)	(4.40%)	(6.00%)
Effective tax rate		12.60%	16.40%	(10.70%)
[1]	Includes (3.2)%, (4.6)% and (6.7)% relating to the absence of tax on noncontrolling interest in 2019, 2018 and 2017, respectively.

Income Taxes (Reconciliation _2

Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Noncontrolling Interest Income (Loss), Percent	(3.20%)	(4.60%)	(6.70%)

Income Taxes (Schedule of Defer

Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred income taxes:
Total deferred income tax assets	$ 3,736,000,000	$ 2,748,000,000
Total deferred income tax liabilities	9,883,000,000	7,813,000,000
Total net deferred income tax liabilities	6,147,000,000	5,065,000,000
Plant and equipment, primarily depreciation method and basis differences	6,616,000,000	4,933,000,000
Excess deferred income taxes	(1,306,000,000)	(993,000,000)
Unrecovered NND Project costs	553	0
DESC rate refund	(169)	0
Toshiba Settlement	(219)	0
Nuclear decommissioning	909,000,000	815,000,000
Deferred state income taxes	863,000,000	626,000,000
Federal benefit of deferred state income taxes	(184,000,000)	(132,000,000)
Deferred fuel, purchased energy and gas costs	30,000,000	60,000,000
Pension benefits	174,000,000	81,000,000
Other postretirement benefits	(37,000,000)	(5,000,000)
Loss and credit carryforwards	(1,832,000,000)	(1,546,000,000)
Valuation allowances	161,000,000	158,000,000
Partnership basis differences	823,000,000	1,135,000,000
Other	(235,000,000)	(67,000,000)
Total net deferred income tax liabilities	6,147,000,000	5,065,000,000
Deferred Investment Tax Credits - Regulated Operations	130,000,000	51,000,000
Total Deferred Taxes and Deferred Investment Tax Credits	6,277,000,000	5,116,000,000
Virginia Electric and Power Company
Deferred income taxes:
Total deferred income tax assets	1,207,000,000	1,054,000,000
Total deferred income tax liabilities	4,058,000,000	4,020,000,000
Total net deferred income tax liabilities	2,851,000,000	2,966,000,000
Plant and equipment, primarily depreciation method and basis differences	3,359,000,000	3,367,000,000
Excess deferred income taxes	(672,000,000)	(678,000,000)
Unrecovered NND Project costs	0	0
DESC rate refund	0	0
Toshiba Settlement	0	0
Nuclear decommissioning	290,000,000	273,000,000
Deferred state income taxes	302,000,000	284,000,000
Federal benefit of deferred state income taxes	(63,000,000)	(60,000,000)
Deferred fuel, purchased energy and gas costs	1,000,000	59,000,000
Pension benefits	(153,000,000)	(132,000,000)
Other postretirement benefits	62,000,000	55,000,000
Loss and credit carryforwards	(280,000,000)	(183,000,000)
Valuation allowances	5,000,000	5,000,000
Partnership basis differences	0	0
Other	0	(24,000,000)
Total net deferred income tax liabilities	2,851,000,000	2,966,000,000
Deferred Investment Tax Credits - Regulated Operations	111,000,000	51,000,000
Total Deferred Taxes and Deferred Investment Tax Credits	2,962,000,000	3,017,000,000
Dominion Energy Gas Holdings, LLC
Deferred income taxes:
Total deferred income tax assets	206,000,000	296,000,000
Total deferred income tax liabilities	1,494,000,000	1,626,000,000
Total net deferred income tax liabilities	1,288,000,000	1,330,000,000
Plant and equipment, primarily depreciation method and basis differences	742,000,000	671,000,000
Excess deferred income taxes	(149,000,000)	(156,000,000)
Unrecovered NND Project costs	0	0
DESC rate refund	0	0
Toshiba Settlement	0	0
Nuclear decommissioning	0	0
Deferred state income taxes	199,000,000	203,000,000
Federal benefit of deferred state income taxes	(42,000,000)	(43,000,000)
Deferred fuel, purchased energy and gas costs	0	(1,000,000)
Pension benefits	154,000,000	134,000,000
Other postretirement benefits	(6,000,000)	(3,000,000)
Loss and credit carryforwards	(1,000,000)	(5,000,000)
Valuation allowances	1,000,000	6,000,000
Partnership basis differences	423,000,000	570,000,000
Other	(33,000,000)	(46,000,000)
Total net deferred income tax liabilities	1,288,000,000	1,330,000,000
Deferred Investment Tax Credits - Regulated Operations	0	0
Total Deferred Taxes and Deferred Investment Tax Credits	$ 1,288,000,000	$ 1,330,000,000

Income Taxes (Schedule of Deduc

Income Taxes (Schedule of Deductible Loss and Credit Carryforwards) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Deductible loss and credit carryforwards [Line Items]
Deductible amount	$ 4,435
Losses, Deferred tax asset	1,856
Losses, Valuation allowance	(155)
Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Deferred Tax Asset	280
Valuation Allowance	(5)
Federal
Deductible loss and credit carryforwards [Line Items]
Deductible amount	1,361
Losses, Deferred tax asset	$ 286
Losses, Expiration Period	2037
Tax credits, Deferred tax asset	$ 40
Federal | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Deferred Tax Asset	213
Federal | Investment Credits
Deductible loss and credit carryforwards [Line Items]
Tax credits, Deferred tax asset	922
Federal | Federal production credits
Deductible loss and credit carryforwards [Line Items]
Tax credits, Deferred tax asset	126
Federal | Federal Production And Other Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Deferred Tax Asset	58
State
Deductible loss and credit carryforwards [Line Items]
Deductible amount	3,074
Losses, Deferred tax asset	173
Losses, Valuation allowance	(57)
State minimum tax credits	165
State | Investment Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Deferred Tax Asset	9
Tax Credits, Valuation allowance	$ (5)
Tax Credits, Expiration Period	2024
State | Investment and Other Credit
Deductible loss and credit carryforwards [Line Items]
Tax credits, Deferred tax asset	$ 144
Tax Credits, Valuation allowance	$ (98)
Earliest Tax Year | Federal | Investment Credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2035
Earliest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2035
Earliest Tax Year | Federal | Federal production credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2035
Earliest Tax Year | Federal | Federal Production And Other Credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2035
Earliest Tax Year | Federal | Federal Production And Other Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2035
Earliest Tax Year | State
Deductible loss and credit carryforwards [Line Items]
Losses, Expiration Period	2020
Earliest Tax Year | State | Investment and Other Credit
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2020
Latest Tax Year | Federal | Investment Credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2039
Latest Tax Year | Federal | Investment Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2039
Latest Tax Year | Federal | Federal production credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2039
Latest Tax Year | Federal | Federal Production And Other Credits
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2038
Latest Tax Year | Federal | Federal Production And Other Credits | Virginia Electric and Power Company
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2039
Latest Tax Year | State
Deductible loss and credit carryforwards [Line Items]
Losses, Expiration Period	2038
Latest Tax Year | State | Investment and Other Credit
Deductible loss and credit carryforwards [Line Items]
Tax Credits, Expiration Period	2031

Income Taxes (Unrecognized Tax

Income Taxes (Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1		$ 44		$ 38	$ 64
Acquired unrecognized tax benefits		129	[1]	0	0
Increases-prior period positions		0		10	1
Decreases-prior period positions		0		0	(9)
Increases-current period positions		9		10	5
Settlements with tax authorities		(7)		(6)	(23)
Expiration of statutes of limitations		0		(8)	0
Balance at December 31		175		44	38
Virginia Electric and Power Company
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1		2		4	13
Acquired unrecognized tax benefits		0		0	0
Increases-prior period positions		0		0	0
Decreases-prior period positions		0		0	(1)
Increases-current period positions		0		0	0
Settlements with tax authorities	$ (8)	(2)		(1)	(8)
Expiration of statutes of limitations		0		(1)	0
Balance at December 31		0		2	4
Dominion Energy Gas Holdings, LLC
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1		2		2	9
Acquired unrecognized tax benefits		0		0	0
Increases-prior period positions		0		0	0
Decreases-prior period positions		0		0	0
Increases-current period positions		0		0	0
Settlements with tax authorities		0		0	(7)
Expiration of statutes of limitations		0		0	0
Balance at December 31		$ 2		$ 2	$ 2
[1]	Acquired unrecognized tax benefits reflect $106 million plus increases in prior period positions of $76 million and decreases in prior period positions of $53 million that were recorded through purchase accounting.

Income Taxes (Unrecognized Ta_2

Income Taxes (Unrecognized Tax Benefits) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Acquisition	$ 129	[1]	$ 0	$ 0
Increases-prior period positions	0		10	1
Decreases in prior period position	0		$ 0	$ 9
SCANA
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Acquisition	106
Increases-prior period positions	76
Decreases in prior period position	$ 53
[1]	Acquired unrecognized tax benefits reflect $106 million plus increases in prior period positions of $76 million and decreases in prior period positions of $53 million that were recorded through purchase accounting.

Income Taxes (Earliest Tax Year

Income Taxes (Earliest Tax Year) (Detail)	12 Months Ended
	Dec. 31, 2019
Pennsylvania
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2012	[1]
Connecticut
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2016
Virginia
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2016	[2]
West Virginia
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2016	[1]
New York
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2015	[1]
Utah
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2016
South Carolina
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2012
[1]	Considered a major state for Dominion Energy Gas’ operations.
[2]	Considered a major state for Virginia Power’s operations.

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2019USD ($)$ / DTH$ / MWh	Dec. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 93		$ 294
Fair Value of Derivative Liabilities		740		279
Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		24		93
Fair Value of Derivative Liabilities		466		103
Level 3 | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Assets		19
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Assets		5,963		5,156
Total liabilities		740		279
Fair Value, Measurements, Recurring | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Assets		2,748		2,297
Total liabilities			$ 466	103
Fair Value, Measurements, Recurring | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		74		250
Fair Value of Derivative Liabilities		131		135
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		22		90
Fair Value of Derivative Liabilities		103		15
Fair Value, Measurements, Recurring | Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Assets		19		70
Total liabilities		56		6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Liabilities		0
Total Assets		19		66
Total liabilities		56		6
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		19		70
Fair Value of Derivative Liabilities		56		6
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		19		66
Fair Value of Derivative Liabilities		56		$ 6
Fair Value, Measurements, Recurring | Level 3 | Natural Gas | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[1]	13
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | FTRs [Member] | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Liabilities		5
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | FTRs [Member] | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		6
Fair Value of Derivative Liabilities		5
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | FTRs [Member] | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 6
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Assets | FTRs [Member] | Commodity | Market Price [Member] | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	5
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Assets | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Minimum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Assets | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Maximum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	5
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Assets | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Weighted Average | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Assets | FTRs [Member] | Physical Options [Member] | Market Price [Member] | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[1]	$ 13
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Liabilities	[1]	$ 43
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	2
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Minimum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	2
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Maximum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2],[3]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Commodity | Market Price [Member] | Liabilities | Weighted Average | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2],[3]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | FTRs [Member] | Commodity | Market Price [Member] | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Assets | Commodity | Market Price [Member] | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Assets | Commodity | Market Price [Member] | Minimum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH		1
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Assets | Commodity | Market Price [Member] | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	4
Fair Value, Measurements, Recurring | Discounted Cash Flow [Member] | Level 3 | Natural Gas | Assets | Commodity | Market Price [Member] | Maximum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH		4
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Electricity | Physical Options [Member] | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 8
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Liabilities		$ 8
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	1
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Minimum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	1
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	4
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Maximum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2]	4
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2],[3]	3
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Market Price [Member] | Liabilities | Weighted Average | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / DTH	[2],[3]	3
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	24.00%
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Minimum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	24.00%
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	66.00%
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Maximum | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	66.00%
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[3],[4]	37.00%
Fair Value, Measurements, Recurring | Option Model [Member] | Level 3 | Natural Gas | Physical Options [Member] | Price Volatility [Member] | Liabilities | Weighted Average | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[3],[4]	37.00%
[1]	Includes basis.
[2]	Represents market prices beyond defined terms for Levels 1 and 2.
[3]	Averages weighted by volume.
[4]	Represents volatilities unrepresented in published markets.

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($)		3 Months Ended	12 Months Ended
		Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Oct. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maximum borrowing capacity	[1]	$ 6,000,000,000	$ 6,000,000,000	$ 6,000,000,000
Impairment of assets and other charges			1,535,000,000	403,000,000	$ 15,000,000
Revolving Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maximum borrowing capacity						$ 700,000,000
Revolving Credit Facility | Atlantic Coast Pipeline | Financial Guarantee [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maximum borrowing capacity							$ 3,400,000,000
Guarantee liability							$ 30,000,000
Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt maximum borrowing capacity	[2]	1,500,000,000	1,500,000,000	1,500,000,000
Impairment of assets and other charges		219,000,000	$ 13,000,000	163,000,000	$ 15,000,000
Asset impairment charges, after tax		165,000,000
Property, plant and equipment estimated fair value		$ 190,000,000		$ 190,000,000
[1]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 01, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 93		$ 294
Derivative Liabilities	740		279
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	24		93
Derivative Liabilities	466		103
Virginia Electric and Power Company | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1
Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	8		31
Derivative Liabilities	86		19
Total assets	8		31
Total liabilities	86		19
Dominion Energy Gas Holdings, LLC | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			3
Dominion Energy Gas Holdings, LLC | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	83		17
Dominion Energy Gas Holdings, LLC | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	3
Level 1 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			455
Level 2 | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			431
Level 2 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	719
Level 2 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	623
Level 2 | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	8		31
Total liabilities	86		19
Level 3 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	19
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	5,963		5,156
Total liabilities	740		279
Fair Value, Measurements, Recurring | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			431
Fair Value, Measurements, Recurring | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	4,195		3,277
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	463
Fair Value, Measurements, Recurring | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,192		1,143
Fair Value, Measurements, Recurring | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	20		11
Fair Value, Measurements, Recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	74		250
Derivative Liabilities	131		135
Fair Value, Measurements, Recurring | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	11		18
Derivative Liabilities	606		142
Fair Value, Measurements, Recurring | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	8		26
Derivative Liabilities	3		2
Fair Value, Measurements, Recurring | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	2,748		2,297
Total liabilities		$ 466	103
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			1,476
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Investments	1,920		221
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	256		507
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	547
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	22		90
Derivative Liabilities	103		15
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	2		3
Derivative Liabilities	363		88
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			2
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			26
Derivative Liabilities			2
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	4,687		3,743
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	4,195		3,277
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	473
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	19		11
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	2,106		1,640
Total liabilities	0
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			1,476
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,920
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			164
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	186
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Derivative Liabilities	0
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Derivative Liabilities	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,257		1,343
Total liabilities	684		273
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	463
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			688
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1
Fair Value, Measurements, Recurring | Level 2 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	55		180
Derivative Liabilities	75		129
Fair Value, Measurements, Recurring | Level 2 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	11		18
Derivative Liabilities	606		142
Fair Value, Measurements, Recurring | Level 2 | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	8		26
Derivative Liabilities	3		2
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets			591
Total liabilities	410		97
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			221
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	256		343
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	361
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	3		24
Derivative Liabilities	47		9
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	2		3
Derivative Liabilities	363		88
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			3
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset			2
Derivative Liabilities	83		17
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	8		26
Derivative Liabilities	3		2
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	19		70
Total liabilities	56		6
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	19		70
Derivative Liabilities	56		6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities	0
Total assets	19		66
Total liabilities	56		6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	19		66
Derivative Liabilities	56		$ 6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 0

Fair Value Measurements (Asse_2

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value using NAV	$ 274	$ 220
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value using NAV	$ 159	$ 160

Fair Value Measurements (Net Ch

Fair Value Measurements (Net Change in the Assets and Liabilities Measured at Fair Value on a Recurring Basis and Included in the Level 3 Fair Value Category) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dominion Energy Gas Holdings, LLC
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance		$ 2	$ 2
Total realized and unrealized gains (losses):
Included in other comprehensive income (loss)		1	(3)
Transfers out of Level 3		1	3
Ending balance			2
Commodity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 64	150	139
Total realized and unrealized gains (losses):
Included in other comprehensive income (loss)	0	1	(2)
Included in regulatory assets/liabilities	(90)	(44)	42
Settlements	17	(27)	6
Purchases	(10)	0	0
Sales	6	0	0
Transfers out of Level 3	(3)	1	3
Ending balance	(37)	64	150
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date	0	0	2
Commodity | Virginia Electric and Power Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	60	147	143
Total realized and unrealized gains (losses):
Included in regulatory assets/liabilities	(88)	(45)	40
Settlements	13	(25)	7
Ending balance	(37)	60	147
Operating Revenue | Commodity
Total realized and unrealized gains (losses):
Included in earnings	(1)	(2)	3
Electric fuel and other energy-related purchases | Commodity
Total realized and unrealized gains (losses):
Included in earnings	(22)	(15)	(42)
Electric fuel and other energy-related purchases | Commodity | Virginia Electric and Power Company
Total realized and unrealized gains (losses):
Included in earnings	(22)	(17)	(43)
Purchased Gas | Commodity
Total realized and unrealized gains (losses):
Included in earnings	$ 2	$ 0	$ 1

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[1]	$ 32,055		$ 29,952
Credit facility borrowings		0		73
Junior subordinated notes	[2]	4,797		3,430
Remarketable subordinated notes	[2]	0		1,386
Carrying Amount | Virginia Electric and Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[2]	12,326		11,671
Carrying Amount | Dominion Energy Gas Holdings, LLC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[3]	5,520		7,770
Credit facility borrowings		0		73
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[3],[4]	36,155		31,045
Credit facility borrowings	[4]	0		73
Junior subordinated notes	[2],[4]	4,953		3,358
Remarketable subordinated notes	[2],[4]	0		1,340
Estimate of Fair Value | Virginia Electric and Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year		14,281	[3],[4]	12,400	[2]
Estimate of Fair Value | Dominion Energy Gas Holdings, LLC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[3],[4]	5,738		7,803
Credit facility borrowings	[4]	$ 0		$ 73
[1]	Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At December 31, 2019 and 2018, includes the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt of $4 million and $(20) million, respectively.
[2]	Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium.
[3]	Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.
[4]	Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

Fair Value Measurements (Fina_2

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Valuation of certain fair value hedges associated with fixed rate debt	$ 4	$ (20)

Derivatives and Hedge Account_3

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions	Dec. 31, 2019		Dec. 31, 2018
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	$ 91	[1]	$ 287
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	53		83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received			0
Net Amounts	38		204
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	21		67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	3		61
Dominion Energy Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	8		31
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	0		29
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	35	[1]	175
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0
Net Amounts	14		163
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	37	[1]	68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	16
Commodity | Virginia Electric and Power Company | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	19		64
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	1		58
Commodity | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	0		3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	0		3
Interest rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	11	[1]	18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	8		17
Interest rate | Virginia Electric and Power Company | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	2		3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	2		3
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	0		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	0		2
Foreign currency | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	8	[1]	26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	0		24
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	8		26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	$ 0		$ 24
[1]	Excludes $2 million and $7 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.

Derivatives and Hedge Account_4

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Derivative assets, not subject to a master netting or similar arrangement	$ 2	$ 7
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Derivative assets, not subject to a master netting or similar arrangement	$ 3	$ 26

Derivatives and Hedge Account_5

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2019		Dec. 31, 2018
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	$ 735	[1]	$ 278
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	53		83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	35		47
Net Amounts	647		148
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	422		94
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	404		88
Dominion Energy Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	86		19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	78		17
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	105	[1]	19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		12
Net Amounts	84		7
Commodity | Exchange
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	21	[1]	115
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	21		68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral			47
Net Amounts			0
Commodity | Virginia Electric and Power Company | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	59		6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	18		6
Net Amounts	41
Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	606	[1]	142
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	8		1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	35
Net Amounts	563		141
Interest rate | Virginia Electric and Power Company | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	363		88
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	363		88
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	83		17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	78		17
Foreign currency | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	3	[1]	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		2
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	3		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0		0
Net Amounts	$ 0		$ 0
[1]	Excludes $5 million and $1 million of derivative liabilities at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.

Derivatives and Hedge Account_6

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Offsetting Liabilities [Line Items]
Derivative liabilities, not subject to a master netting or similar arrangement	$ 5	$ 1
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Derivative liabilities, not subject to a master netting or similar arrangement	$ 44	$ 9

Derivatives and Hedge Account_7

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)MWhgalBcf
Fixed Price - Natural Gas - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	34	[1]
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	9	[1]
Basis - Natural Gas - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	495	[1]
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	448
Fixed Price - Electricity - Non-current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	0	[1]
Financial Transmission Rights - Electricity- Non-current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	0	[1]
Liquids - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | gal	0	[2]
Interest Rate - Non-current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	$ 3,976,014,497	[3]
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	950,000,000	[3]
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	1,050,000,000	[3]
Foreign Exchange - Non- Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	250,000,000	[3],[4]
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	$ 250,000,000	[3],[5]
Fixed Price - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	79	[1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	41	[1]
Basis - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	227	[1]
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	132
Fixed Price - Electricity - Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	3,810,015	[1]
Financial Transmission Rights - Electricity- Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	46,585,304	[1]
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	46,585,304
Liquids - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | gal	52,374,000	[2]
Interest Rate - Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	$ 2,450,000,000	[3]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	900,000,000	[3]
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	250,000,000	[3]
Foreign Exchange - Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	0	[3],[4]
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	$ 0	[3],[5]
[1]	Includes options.
[2]	Includes NGLs.
[3]	Maturity is determined based on final settlement period.
[4]	Euro equivalent volumes are € 250,000,000.
[5]	Euro equivalent volumes are €250,000,000.

Derivatives and Hedge Account_8

Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (407)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	50
Commodity | Electricity
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	19
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ 19
Maximum Term	12 months
Commodity | Other Energy Contract
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ 1
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ 1
Maximum Term	12 months
Commodity | Natural Gas
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (4)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ 4
Maximum Term	24 months
Interest rate
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (426)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (64)
Maximum Term	384 months
Foreign currency
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ 3
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (2)
Maximum Term	78 months
Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (81)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	13
Dominion Energy Gas Holdings, LLC | Interest rate
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	(84)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ 15
Maximum Term	300 months
Dominion Energy Gas Holdings, LLC | Foreign currency
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ 3
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (2)
Maximum Term	78 months
Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (34)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(1)
Virginia Electric and Power Company | Interest rate
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	(34)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (1)
Maximum Term	384 months

Derivatives and Hedge Account_9

Derivatives and Hedge Accounting Activities (Schedule of Amounts Recorded on Balance Sheet Related to Cumulative Basis Adjustments for Fair Value Hedges) (Detail) - Designated as Hedging Instrument - Fair Value Hedging - Long-term Debt - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of the Hedged Asset (Liability)	[1]	$ (1,154)	$ (1,631)
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged (Liabilities)	[2]	$ (4)
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets			$ 20
[1]	Includes $(397) million and $(892) million related to discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively.
[2]	Includes $3 million and $8 million of hedging adjustments on discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively.

Derivatives and Hedge Accoun_10

Derivatives and Hedge Accounting Activities (Schedule of Amounts Recorded on Balance Sheet Related to Cumulative Basis Adjustments for Fair Value Hedges) (Parenthetical) (Detail) - Designated as Hedging Instrument - Fair Value Hedging - Long-term Debt - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Discontinued hedging liability	$ (397)	$ (892)
Hedging adjustments on discontinued hedging relationships	$ 3	$ 8

Derivatives and Hedge Accoun_11

Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Derivatives Fair Value [Line Items]
Derivative Asset		$ 93		$ 294
Derivative Liabilities		740		279
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		24		93
Derivative Liabilities		466		103
Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset		8		31
Derivative Liabilities		86		19
Dominion Energy Gas Holdings, LLC | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset				3
Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		83		17
Dominion Energy Gas Holdings, LLC | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		3
Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[1]	68		223
Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		67		209
Current Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		1		14
Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		20
Derivative Liabilities				63
Current Assets | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		20		60
Current Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				10
Current Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[2]			5
Current Assets | Dominion Energy Gas Holdings, LLC | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset				3
Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset				2
Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	25		71
Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		7		41
Noncurrent Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		10		4
Noncurrent Assets | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset		8		26
Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		4
Derivative Liabilities				30
Noncurrent Assets | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				30
Noncurrent Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		185
Derivative Liabilities				78
Noncurrent Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[4]	8		26
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset				26
Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[5]	408		157
Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		83		129
Current Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		322		26
Current Liabilities | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		2
Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		243		25
Current Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		58
Current Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		178
Current Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities	[6]	33		11
Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		30		9
Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		2
Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	332		122
Noncurrent Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		48		6
Noncurrent Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		284		116
Noncurrent Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		223		78
Noncurrent Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		45
Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		3
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities		53	[8]	8
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		53		8
Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Derivative Asset		50		105
Derivative Liabilities		598		166
Designated as Hedging Instrument | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		2		3
Derivative Liabilities		363		88
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset				31
Derivative Liabilities		86		19
Designated as Hedging Instrument | Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[1]	31		69
Designated as Hedging Instrument | Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		30		55
Designated as Hedging Instrument | Current Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		1		14
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		0
Derivative Liabilities				3
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				10
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[2]			5
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset				3
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset				2
Designated as Hedging Instrument | Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	19		36
Designated as Hedging Instrument | Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		1		6
Designated as Hedging Instrument | Noncurrent Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		10		4
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset		8		26
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				0
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		0
Derivative Liabilities				0
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		185
Derivative Liabilities				78
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[4]	8		26
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset				26
Designated as Hedging Instrument | Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[5]	330		45
Designated as Hedging Instrument | Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		6		17
Designated as Hedging Instrument | Current Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		321		26
Designated as Hedging Instrument | Current Liabilities | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		2
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		185		10
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities				15
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		178
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities	[6]	33		11
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		30		9
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		2
Designated as Hedging Instrument | Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	268		121
Designated as Hedging Instrument | Noncurrent Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		5
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		267		116
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		178		78
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		0
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		3
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities		53	[8]	8
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		53		8
Fair Value - Derivatives not under Hedge Accounting
Derivatives Fair Value [Line Items]
Derivative Asset		43		189
Derivative Liabilities		142		113
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		22		90
Derivative Liabilities		103		15
Fair Value - Derivatives not under Hedge Accounting | Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[1]	37		154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		37		154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		0		0
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		20
Derivative Liabilities				60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		20		60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		0
Derivative Liabilities				0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	6		35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		6		35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		0		0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset		0		0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		2
Derivative Liabilities				30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		0
Derivative Liabilities				0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[5]	78		112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		77		112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		0		0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		58		15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		58		15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	64		1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		47		1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		17		0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		45		$ 0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		45
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		$ 0
[1]	Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[2]	Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
[3]	Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[4]	Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[5]	Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets.
[6]	Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2019. Current derivative liabilities include $2 million in other current liabilities, with the remainder recorded in current liabilities of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018.
[7]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[8]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

Derivatives and Hedge Accoun_12

Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Parenthetical) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Dominion Energy Gas Holdings, LLC | Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset	$ 2

Derivatives and Hedge Accoun_13

Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	$ (145)		$ 40		$ 11
Amount of Gain (Loss) Reclassified From AOCI to Income		83		(137)		47
Increase (Decrease) in Derivatives Subject to Regulatory Treatment		(255)		39	[2]	(58)	[2]
Commodity
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	125		64		1
Amount of Gain (Loss) Reclassified From AOCI to Income		143		(76)		79
Commodity | Operating Revenue
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		146		(90)		81
Commodity | Purchased Gas
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		(3)		14		(2)
Interest rate
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1],[3]	(252)		(18)		(8)
Amount of Gain (Loss) Reclassified From AOCI to Income		(54)		(48)		(52)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	(255)	[4]	39	[3]	(58)	[3]
Foreign currency
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	(18)	[4]	6	[3]	18	[4]
Amount of Gain (Loss) Reclassified From AOCI to Income		(6)		(13)		20
Cash Flow Hedges | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)		(30)		2		(8)
Amount of Gain (Loss) Reclassified From AOCI to Income		(1)		(1)		(1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment		(259)		39		(58)
Cash Flow Hedges | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)		85		21		9
Amount of Gain (Loss) Reclassified From AOCI to Income		(7)		26		6
Cash Flow Hedges | Commodity | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)		1				10
Amount of Gain (Loss) Reclassified From AOCI to Income		4		(8)		8
Cash Flow Hedges | Interest rate | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[5],[6]	(30)		2		(8)
Amount of Gain (Loss) Reclassified From AOCI to Income		(1)		(1)		(1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[5],[6]	(259)		39		(58)
Cash Flow Hedges | Interest rate | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[7],[8]	(68)		(16)		1
Amount of Gain (Loss) Reclassified From AOCI to Income	[7],[8]	(5)		(5)		(6)
Cash Flow Hedges | Foreign currency | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[7],[9]	(18)		(6)		18
Amount of Gain (Loss) Reclassified From AOCI to Income	[7],[9]	(6)		(13)		20
Cash Flow Hedges | Net income from discontinued operations | Commodity | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		$ 4		$ 8		$ 8
[1]	Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[2]	Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[3]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges.
[4]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
[5]	Amounts deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income.
[6]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[7]	Amounts deferred into AOCI have no associated effect in Dominion Energy Gas’ Consolidated Statements of Income.
[8]	Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges.
[9]	Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in other income.

Derivatives and Hedge Accoun_14

Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		$ (26)	$ (26)	$ (45)
Derivatives Not Designated as Hedging Instruments | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		(45)	2	(57)	[1]
Derivatives Not Designated as Hedging Instruments | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives			(11)
Derivatives Not Designated as Hedging Instruments | Commodity | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]	(45)	2	(57)	[1]
Derivatives Not Designated as Hedging Instruments | Commodity | Operating Revenue
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		45	(28)	18
Derivatives Not Designated as Hedging Instruments | Commodity | Operating Revenue | Dominion Energy Gas Holdings, LLC
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives			(11)
Derivatives Not Designated as Hedging Instruments | Commodity | Purchased Gas
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		(28)	11	(3)
Derivatives Not Designated as Hedging Instruments | Commodity | Electric Fuel and Other Energy-Related Purchases
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		(46)	(9)	(59)
Derivatives Not Designated as Hedging Instruments | Commodity | Other operations and maintenance
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		0	$ 0	$ (1)
Derivatives Not Designated as Hedging Instruments | Commodity | Interest rate
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		$ 3
[1]	Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.
[2]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.

Earnings Per Share (Calculation

Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Earnings Per Share [Line Items]
Net income attributable to Dominion Energy	$ 1,009	$ 975	$ 54	$ (680)	$ 641	$ 854	$ 449	$ 503	$ 1,358	$ 2,447	$ 2,999
Preferred stock dividends (see Note 19)									(17)
Net income attributable to Dominion Energy - Basic									1,341	2,447	2,999
Dilutive effect of Series A Preferred Stock									(28)
Net income attributable to Dominion Energy - Diluted									$ 1,313	$ 2,447	$ 2,999
Average shares of common stock outstanding – Basic									808.8	654.2	636
Net effect of dilutive securities									0.1	0.7
Average shares of common stock outstanding – Diluted									808.9	654.9	636
Earnings Per Common Share – Basic	$ 1.22	$ 1.19	$ 0.07	$ (0.86)	$ 0.97	$ 1.31	$ 0.69	$ 0.77	$ 1.66	$ 3.74	$ 4.72
Earnings Per Common Share – Diluted	$ 1.21	$ 1.17	$ 0.05	$ (0.86)	$ 0.97	$ 1.30	$ 0.69	$ 0.77	$ 1.62	$ 3.74	$ 4.72

Investments (Narrative) (Detail

Investments (Narrative) (Detail) $ in Millions		1 Months Ended		3 Months Ended		12 Months Ended
		Sep. 30, 2018USD ($)	Sep. 30, 2014miMember	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Feb. 25, 2020USD ($)
Schedule of Equity Method Investments [Line Items]
Equity in earnings on investments						$ 168	$ 197	$ 14
Distributions received from investment						112	209	419
Carrying amount of investment that exceeded share of underlying equity				$ 161		110	161
Equity method investment goodwill				49		159	49
Equity in earnings on investments						168	197	(18)
Length of natural gas pipeline (in miles) | mi			600
Other receivables	[1]			331		367	331
Contributions to equity method affiliates						209	428	370
Impairment charge						1,535	403	15
Liabilities, other deferred credits and other liabilities				$ 17,075		26,027	17,075
Income tax expense						351	$ 580	(30)
Cost to acquire equity method investments									$ 175
Blue Racer
Schedule of Equity Method Investments [Line Items]
Ownership percentage				50.00%			50.00%
Additional consideration including interest received in connection with sale						151
Wrangler Retail Gas Holdings L L C
Schedule of Equity Method Investments [Line Items]
Amount of gain from sale						$ 147
Ownership interest percentage of limited partner interests						20.00%
Limited partnership interest sale transaction, proceeds received						$ 301
Goodwill write-off						73
Income tax expense						82
Residential contract asset						41
Intial Fair value						75
Catalyst Old River Hydroelectric Limited Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage of limited partner interests		25.00%
Finite Lived Equity Method Investment Basis Difference
Schedule of Equity Method Investments [Line Items]
Carrying amount of investment that exceeded share of underlying equity				$ 146	$ 15		$ 146	15
Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity in earnings on investments						43	54	47
Other receivables	[2]			18		26	18
Impairment charge				219		13	163	15
Liabilities, other deferred credits and other liabilities				2,213		2,277	2,213
Income tax expense						101	124	(65)
Dominion Energy Gas Holdings, LLC | Partnership Interest
Schedule of Equity Method Investments [Line Items]
Distributions received from investment						74	64	55
Carrying amount of investment that exceeded share of underlying equity				146			146
Equity in earnings on investments						43	54	47
Trading Securities
Schedule of Equity Method Investments [Line Items]
Rabbi trust securities				111		120	111
Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Distributions received from investment							36	270
Contributions to equity method affiliates						$ 186	414	310
Ownership percentage						48.00%
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage									53.00%
Ownership percentage acquired									5.00%
Atlantic Coast Pipeline | DETI
Schedule of Equity Method Investments [Line Items]
Revenue						$ 103	203	129
Other receivables				$ 13		7	$ 13
Atlantic Coast Pipeline | Previous Maximum
Schedule of Equity Method Investments [Line Items]
Project cost estimates						$ 8
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)				48.00%			48.00%
Number of members | Member			3
Duration of contract			20 years
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution | Duke Energy
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)				47.00%			47.00%
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution | Southern Company Gas
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)				5.00%			5.00%
Blue Racer
Schedule of Equity Method Investments [Line Items]
Amount of gain from sale							$ 546
Amount of after tax gain from sale							390
Up-front cash consideration							1,050
Additional deferred consideration, subject to increase for interest cost effective payable upon purchaser's availability of cash							150
Aggregate amount of contingent consideration, maximum				$ 300			300
NedPower Mount Storm LLC
Schedule of Equity Method Investments [Line Items]
Liabilities, other deferred credits and other liabilities				1	17		1	$ 17
NedPower Mount Storm LLC | Property, Plant and Equipment
Schedule of Equity Method Investments [Line Items]
Impairment charge					126
Impairment charge, after tax					$ 76
Fowler I Holdings LLC
Schedule of Equity Method Investments [Line Items]
Impairment charge				32
Impairment charge, after tax				20
Fair value of investment				$ 81			$ 81
Ownership percentage						50.00%
Catalyst Old River Hydroelectric Limited Partnership
Schedule of Equity Method Investments [Line Items]
Limited partnership interest sale transaction, proceeds received		$ 91
Catalyst Old River Hydroelectric Limited Partnership | Other Income
Schedule of Equity Method Investments [Line Items]
Amount of gain from sale		87
Amount of after tax gain from sale		$ 63
Iroquois
Schedule of Equity Method Investments [Line Items]
Ownership percentage						50.00%
Iroquois | Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage						50.00%
Iroquois | Oil and Gas Properties
Schedule of Equity Method Investments [Line Items]
Ownership percentage				100.00%			100.00%
White River Hub LLC | Oil and Gas Properties
Schedule of Equity Method Investments [Line Items]
Ownership percentage				100.00%			100.00%
Pivotal LNG | JAX LNG LLC
Schedule of Equity Method Investments [Line Items]
Percentage of interest held									50.00%
Pivotal LNG | Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage acquired									100.00%
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to related parties.

Investments (Equity and Debt Se

Investments (Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Investment Holdings [Line Items]
Amortized Cost, Total		$ 3,691		$ 3,348
Total Unrealized Gains		2,523		1,662
Total Unrealized Losses	[1]	(22)		(72)
Fair Value, Total		6,192		4,938
Fixed income securities Fair Value		1,727
Fixed Income
Investment Holdings [Line Items]
Cash equivalents and other Amortized Cost		13	[2]	4
Cash equivalents and other Fair Value		13	[2]	4
Common/collective trust funds | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	115		76
Fixed income securities Total Unrealized Gains		4	[3]	0
Fixed income securities Fair Value	[3]	119		76
Equity securities: | U.S.
Investment Holdings [Line Items]
Equity securities Amortized Cost,	[4]	1,807	[3]	1,741
Equity securities Total Unrealized Gains	[4]	2,451	[3]	1,640
Equity securities Total Unrealized Losses	[4]	(20)	[3]	(51)
Equity securities Fair Value	[4]	4,238	[3]	3,330
Corporate debt instruments | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	434		435
Fixed income securities Total Unrealized Gains	[3]	29		5
Fixed income securities Total Unrealized Losses	[3]			(9)
Fixed income securities Fair Value	[3]	463		431
Government Securities | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	1,108		1,092
Fixed income securities Total Unrealized Gains	[3]	39		17
Fixed income securities Total Unrealized Losses	[3]	(2)		(12)
Fixed income securities Fair Value	[3]	1,145		1,097
Insurance contracts
Investment Holdings [Line Items]
Amortized Cost, Total		214
Fair Value, Total		214
Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total		1,721		1,643
Total Unrealized Gains		1,173		760
Total Unrealized Losses		(13)	[1],[5]	(34)
Fair Value, Total		2,881		2,369
Fixed income securities Fair Value		853
Virginia Electric and Power Company | Common/collective trust funds | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	51		51
Fixed income securities Fair Value	[3]	51		51
Virginia Electric and Power Company | Cash Equivalents and Other [Member]
Investment Holdings [Line Items]
Cash equivalents and other Amortized Cost		1		6	[3],[6]
Cash equivalents and other Fair Value		1		6	[3],[6]
Virginia Electric and Power Company | Equity securities: | U.S.
Investment Holdings [Line Items]
Equity securities Amortized Cost,		894	[4]	858
Equity securities Total Unrealized Gains		1,144	[4]	751
Equity securities Total Unrealized Losses		(11)	[4]	(24)
Equity securities Fair Value		2,027	[4]	1,585
Virginia Electric and Power Company | Corporate debt instruments | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	241		224
Fixed income securities Total Unrealized Gains	[3]	15		2
Fixed income securities Total Unrealized Losses	[3]			(5)
Fixed income securities Fair Value	[3]	256		221
Virginia Electric and Power Company | Government Securities | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[3]	534		504
Fixed income securities Total Unrealized Gains	[3]	14		7
Fixed income securities Total Unrealized Losses	[3]	(2)		(5)
Fixed income securities Fair Value	[3]	$ 546		$ 506
[1]	The fair value of securities in an unrealized loss position was $298 million and $833 million at December 31, 2019 and 2018, respectively.
[2]	Includes pending purchases of securities of $1 million at December 31, 2019.
[3]	Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[4]	Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[5]	The fair value of securities in an unrealized loss position was $185 million and $404 million at December 31, 2019 and 2018, respectively.
[6]	Includes pending sales of securities of $6 million at December 31, 2018.

Investments (Equity and Debt _2

Investments (Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Net assets related to pending sales and purchases of securities	$ 1
Fair value of securities in an unrealized loss position	298	$ 833
Virginia Electric and Power Company
Investment Holdings [Line Items]
Net assets related to pending sales and purchases of securities		6
Fair value of securities in an unrealized loss position	$ 185	$ 404

Investments (Portion of Unreali

Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Net losses recognized during the period	$ 919	$ (245)
Less: Net gains recognized during the period on securities sold during the period	(80)	(58)
Unrealized losses recognized during the period on securities still held at the end of the year	839	(303)
Virginia Electric and Power Company
Investment Holdings [Line Items]
Net losses recognized during the period	423	(105)
Less: Net gains recognized during the period on securities sold during the period	(20)	(32)
Unrealized losses recognized during the period on securities still held at the end of the year	$ 403	$ (137)

Investments (Fair Value of our

Investments (Fair Value of our Marketable Debt Securities by Contractual Maturity) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	$ 198
Due after one year through five years	412
Due after five years through ten years	390
Due after ten years	727
Total	1,727
Virginia Electric and Power Company
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	91
Due after one year through five years	175
Due after five years through ten years	206
Due after ten years	381
Total	$ 853

Investments (Selected Informati

Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales	$ 1,712	$ 1,804	$ 1,831
Realized gains	195	140	166
Realized losses	96	91	71
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales	858	887	849
Realized gains	58	60	75
Realized losses	$ 22	$ 27	$ 30

Investments (Recorded Other-Tha

Investments (Recorded Other-Than-Temporary Impairment Losses on Investments) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Total other-than-temporary impairment losses	$ 3	$ 30	$ 44
Losses recorded to the nuclear decommissioning trust regulatory liability	0	0	(16)
Losses recognized in other comprehensive income (before taxes)	(3)	(30)	(5)
Net impairment losses recognized in earnings	0	0	23
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Total other-than-temporary impairment losses	2	15	20
Losses recorded to the nuclear decommissioning trust regulatory liability	0	0	(16)
Losses recognized in other comprehensive income (before taxes)	(2)	(15)	(2)
Net impairment losses recognized in earnings	$ 0	$ 0	$ 2

Investments (Recorded Other-T_2

Investments (Recorded Other-Than-Temporary Impairment Losses on Investments) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses for debt securities	$ 5
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses for debt securities	$ 2

Investments (Investments Under

Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Feb. 25, 2020	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 1,646		$ 1,278
Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership%	48.00%
Investment Balance	$ 1,123		820
Description	Gas transmission system
Iroquois
Schedule of Equity Method Investments [Line Items]
Ownership%	50.00%
Investment Balance	$ 276		302
Description	Gas transmission system
Fowler I Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership%	50.00%
Investment Balance	$ 74		82
Description	Wind-powered merchant     generation facility
Wrangler
Schedule of Equity Method Investments [Line Items]
Ownership%	20.00%
Investment Balance	$ 77		0
Description	Nonregulated retail     energy marketing
Other Investment
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 96		74
Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 312		339
Dominion Energy Gas Holdings, LLC | Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership%		53.00%
Dominion Energy Gas Holdings, LLC | Iroquois
Schedule of Equity Method Investments [Line Items]
Ownership%	50.00%
Investment Balance	$ 276		302
Description	Gas transmission system
Dominion Energy Gas Holdings, LLC | White Rive Hub
Schedule of Equity Method Investments [Line Items]
Ownership%	50.00%
Investment Balance	$ 36		$ 37
Description	Gas transmission system

Investments (Investments Unde_2

Investments (Investments Under Equity Method of Accounting) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Liabilities, other deferred credits and other liabilities	$ 26,027	$ 17,075
NedPower Mount Storm LLC
Schedule of Equity Method Investments [Line Items]
Liabilities, other deferred credits and other liabilities		$ 1	$ 17

Investments (Financial Informat

Investments (Financial Information Provided Equity Method Investment) (Detail) - Dominion Energy Gas Holdings, LLC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Iroquois
Schedule of Equity Method Investments [Line Items]
Current assets	$ 79	$ 112
Noncurrent assets	586	588
Current liabilities	37	165
Noncurrent liabilities	334	193
Revenues	180	194	$ 194
Operating income	93	108	110
Net income	82	94	93
White River Hub LLC
Schedule of Equity Method Investments [Line Items]
Noncurrent assets	39	41
Current liabilities	2	2
Revenues	10	12	10
Operating income	6	8	7
Net income	$ 6	$ 8	$ 7

Property, Plant and Equipment (

Property, Plant and Equipment (Property, Plant and Equipment) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Utility:
Generation	$ 25,317	$ 18,896
Transmission	20,486	16,666
Distribution	25,748	18,535
Storage	3,227	2,906
Nuclear fuel	2,296	1,626
Oil and gas	1,792	1,763
General and other	2,413	1,783
Plant under construction	2,956	2,348
Total utility	84,235	64,523
Non-jurisdictional—including plant under construction	854	407
Nonutility:
Merchant generation-nuclear	1,652	1,550
Merchant generation-other	3,985	3,802
Nuclear fuel	930	1,025
Gas gathering and processing	190	185
LNG facility	4,425	3,977
Other-including plant under construction	1,195	1,109
Total nonutility	12,377	11,648
Total property, plant and equipment	97,466	76,578
Virginia Electric and Power Company
Utility:
Generation	19,552	18,896
Transmission	10,229	9,391
Distribution	12,095	11,771
Nuclear fuel	1,688	1,626
General and other	825	820
Plant under construction	1,784	1,602
Total utility	46,173	44,106
Non-jurisdictional—including plant under construction	854	407
Nonutility:
Other-including plant under construction	11	11
Total property, plant and equipment	47,038	44,524
Dominion Energy Gas Holdings, LLC
Utility:
Transmission	7,014	6,790
Storage	2,799	2,615
General and other	219	210
Plant under construction	574	732
Total utility	10,606	10,347
Nonutility:
LNG facility	4,425	3,977
Other-including plant under construction	135	376
Total nonutility	4,560	4,353
Total property, plant and equipment	$ 15,166	$ 14,700

Property, Plant and Equipment_2

Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Virginia Electric and Power Company | Bath Country Pumped Storage Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	60.00%	[1]
Plant in service	$ 1,058	[1]
Accumulated depreciation	(661)	[1]
Plant under construction	$ 7	[1]
Virginia Electric and Power Company | North Anna
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	88.40%	[1]
Plant in service	$ 2,564	[1]
Accumulated depreciation	(1,321)	[1]
Nuclear fuel	793	[1]
Accumulated amortization of nuclear fuel	(634)	[1]
Plant under construction	$ 143	[1]
Virginia Electric and Power Company | Clover Power Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	50.00%	[1]
Plant in service	$ 610	[1]
Accumulated depreciation	(247)	[1]
Plant under construction	$ 5	[1]
Dominion Energy | Millstone Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	93.50%	[2]
Plant in service	$ 1,267	[2]
Accumulated depreciation	(449)	[2]
Nuclear fuel	483	[2]
Accumulated amortization of nuclear fuel	(390)	[2]
Plant under construction	$ 87	[2]
Dominion Energy | Summer Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	66.70%	[2]
Plant in service	$ 1,394	[2]
Accumulated depreciation	(659)	[2]
Nuclear fuel	608	[2]
Accumulated amortization of nuclear fuel	(389)	[2]
Plant under construction	$ 77	[2]
[1]	Units jointly owned by Virginia Power.
[2]	Unit jointly owned by Dominion Energy.

Property, Plant and Equipment_3

Property, Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended									3 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)a	Mar. 31, 2018USD ($)a	Jan. 31, 2018USD ($)a	Dec. 31, 2017USD ($)	Aug. 31, 2017a	Jul. 31, 2017USD ($)a	Apr. 30, 2016a	Nov. 30, 2014USD ($)a	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)a	Dec. 01, 2019USD ($)	Oct. 31, 2018USD ($)	Oct. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Jul. 31, 2014a	Dec. 31, 2013a
Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights
Property, Plant and Equipment [Line Items]
Gas and oil area developed net remaining interest conveyed percentage														78.00%
Total consideration	$ 65													$ 130
Marcellus Shale | Final Conveyance | Amended Agreement to Extend Conveyance of Development Rights
Property, Plant and Equipment [Line Items]
Gain on sale													$ 65
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Amount of consideration		$ 6		$ 28					$ 120							$ 200
Gain on sale															$ 70
Development rights (number of acres) | a		9,000	11,000	18,000		70,000	2,000	9,000	24,000						4,000					12,000	100,000
Proceeds from assignment of Shale Development Rights							$ 5		$ 70			$ 116
Gas and oil area developed net remaining interest conveyed percentage				50.00%		68.00%	50.00%								50.00%
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Gain on sale														56
After tax gain on sale										$ 5	$ 33
Development rights (number of acres) | a								70,000
Gas and oil area developed net remaining interest conveyed percentage								32.00%
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Elimination of Overriding Royalty Interest | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Gain on sale														9
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Final Conveyance | Amended Agreement to Extend Conveyance of Development Rights | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
After tax gain on sale													47
Dominion Energy Gas Holdings, LLC | Utica and Point Pleasant Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Amount of consideration			$ 16
Proceeds from assignment of Shale Development Rights			16
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Marcellus Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Gain on sale		$ 6		$ 28			$ 5
After tax gain on sale		$ 4		$ 20			$ 3
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Utica and Point Pleasant Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Gain on sale			16
After tax gain on sale			$ 12
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Amount of consideration																		$ 143
Gain on sale					$ 78							65
After tax gain on sale					48							49
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | First Phase of Agreements to Sell Certain Assets
Property, Plant and Equipment [Line Items]
Amount of consideration					$ 79					$ 79				79
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Second Phase of Agreements to Sell Certain Assets
Property, Plant and Equipment [Line Items]
Amount of consideration																	$ 63
Fairless and Manchester
Property, Plant and Equipment [Line Items]
Amount of consideration													1,200
Gain on sale of equity method investment													210
Gain on sale of equity method investments, net of tax													198
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Virginia Electric and Power Company
Property, Plant and Equipment [Line Items]
Amount of consideration																			$ 91
Amount to be recognized in other income ratably through 2023												22
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Virginia Electric and Power Company | Operating Revenue
Property, Plant and Equipment [Line Items]
Amount recognized in operating revenue and other income from sale												$ 7	$ 6
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Virginia Electric and Power Company | Other Income
Property, Plant and Equipment [Line Items]
Amount recognized in operating revenue and other income from sale														$ 11

Schedule of Acquisitions of Sol

Schedule of Acquisitions of Solar Projects (Detail) $ in Millions		1 Months Ended	12 Months Ended
		Mar. 31, 2019MW	Dec. 31, 2019USD ($)MW	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Project Cost			$ 341	$ 151	$ 405
Acquisition of Solar Project Greensville in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-08
Date Agreement Closed			2019-08
Project Cost	[1]		$ 130
Date of Commercial Operations			Expected 2020
MW capacity | MW			80
Acquisition of Solar Project Myrtle in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-08
Date Agreement Closed			2019-08
Project Cost	[1]		$ 35
Date of Commercial Operations			Expected 2020
MW capacity | MW			15
Acquisition of Solar Project Seabrook in South Carolina
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-09
Date Agreement Closed			2019-09
Project Cost	[1]		$ 103
Date of Commercial Operations			December 2019
MW capacity | MW			72
Acquisition of Solar Project Wilkinson in North Carolina
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-11
Date Agreement Closed			2019-11
Project Cost	[1]		$ 153
Date of Commercial Operations			December 2019
MW capacity | MW			74
Virginia Electric and Power Company
Property, Plant and Equipment [Line Items]
Project Cost			$ 182	$ 141	$ 41
MW capacity | MW		1,292
Virginia Electric and Power Company | Acquisition Of Solar Project Pecan In North Carolina
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2017-09
Date Agreement Closed			2018-10
Project Cost	[1]		$ 140
Date of Commercial Operations			December 2018
MW capacity | MW			75
Virginia Electric and Power Company | Acquisition of Solar Project Gutenberg in North Carolina
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2017-09
Date Agreement Closed			2019-06
Project Cost	[1]		$ 142
Date of Commercial Operations			September 2019
MW capacity | MW			80
Virginia Electric and Power Company | Acquisition of Solar Project Gloucester in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2018-06
Date Agreement Closed			2019-02
Project Cost	[1]		$ 37
Date of Commercial Operations			April 2019
MW capacity | MW			20
Virginia Electric and Power Company | Acquisition of Solar Project Grasshopper in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2018-08
Date Agreement Closed			2019-05
Project Cost	[1]		$ 130
Date of Commercial Operations			Expected 2020
MW capacity | MW			80
Virginia Electric and Power Company | Acquisition of Solar Project Chestnut in North Carolina
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2018-08
Date Agreement Closed			2019-05
Project Cost	[1]		$ 130
Date of Commercial Operations			Expected 2020
MW capacity | MW			75
Virginia Electric and Power Company | Acquisition of Solar Project Ft. Powhatan in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-06
Date Agreement Closed			2019-06
Project Cost	[1]		$ 270
Date of Commercial Operations			Expected 2021
MW capacity | MW			150
Virginia Electric and Power Company | Acquisition of Solar Project Belcher in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-06
Date Agreement Closed			2019-08
Project Cost	[1]		$ 160
Date of Commercial Operations			Expected 2020
MW capacity | MW			88
Virginia Electric and Power Company | Acquisition of Solar Project Bedford in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-08
Date Agreement Closed			2019-11
Project Cost	[1]		$ 110
Date of Commercial Operations			Expected 2021
MW capacity | MW			70
Virginia Electric and Power Company | Acquisition of Solar Project Maplewood in Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-10
Date Agreement Closed			2019-10
Project Cost	[1]		$ 190
Date of Commercial Operations			Expected 2022
MW capacity | MW			120
Virginia Electric and Power Company | Acquisition Of Solar Project Rochambeau In Virginia
Property, Plant and Equipment [Line Items]
Date Agreement Entered			2019-12
Date Agreement Closed			2020-01
Project Cost	[1]		$ 35
Date of Commercial Operations			Expected 2021
MW capacity | MW			20
[1]	Includes acquisition costs.

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	$ 6,410	$ 6,405
Purchase Accounting Adjustment			5
SCANA Combination	[2]	2,609
Contribution of SEMI to Wrangler	[3]	(73)
Goodwill, Ending Balance	[1]	8,946	6,410
Dominion Energy Gas Holdings, LLC
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	1,471	1,466
Purchase Accounting Adjustment			5
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	1,471	1,471
Dominion Energy Gas Holdings, LLC | Dominion Energy Virginia
Goodwill [Roll Forward]
No events affecting goodwill		0
Dominion Energy Gas Holdings, LLC | Gas & Transportation
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	1,471	1,466
Purchase Accounting Adjustment			5
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	1,471	1,471
Dominion Energy Gas Holdings, LLC | Gas Distribution
Goodwill [Roll Forward]
No events affecting goodwill		0
Dominion Energy Gas Holdings, LLC | Dominion Energy South Carolina [Member]
Goodwill [Roll Forward]
No events affecting goodwill		0
Dominion Energy Gas Holdings, LLC | Contracted Generation
Goodwill [Roll Forward]
No events affecting goodwill		0
Dominion Energy Gas Holdings, LLC | Corporate and Other
Goodwill [Roll Forward]
No events affecting goodwill		0
Operating Segments | Dominion Energy Virginia
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	2,106	2,106
Goodwill, Ending Balance	[1]	2,106	2,106
Operating Segments | Gas & Transportation
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	1,565	1,561
Purchase Accounting Adjustment			4
SCANA Combination	[2]	73
Contribution of SEMI to Wrangler	[3]	(73)
Goodwill, Ending Balance	[1]	1,565	1,565
Operating Segments | Gas Distribution
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	2,497	2,496
Purchase Accounting Adjustment			1
SCANA Combination	[2]	1,015
Goodwill, Ending Balance	[1]	3,512	2,497
Operating Segments | Dominion Energy South Carolina [Member]
Goodwill [Roll Forward]
SCANA Combination	[2]	1,521
Goodwill, Ending Balance	[1]	1,521
Operating Segments | Contracted Generation
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	242	242
Goodwill, Ending Balance	[1]	$ 242	$ 242
[1]	Goodwill amounts do not contain any accumulated impairment losses.
[2]	See Note 3 for discussion of Dominion Energy’s acquisitions.
[3]	See Note 9 for additional information.

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Amortization expense for intangible assets	$ 106	$ 82	$ 80
Acquisition of intangible assets	$ 120
Weighted-average amortization period (years)	10 years
Virginia Electric and Power Company
Goodwill [Line Items]
Amortization expense for intangible assets	$ 30	31	31
Acquisition of intangible assets	$ 52
Weighted-average amortization period (years)	8 years
Dominion Energy Gas Holdings, LLC
Goodwill [Line Items]
Amortization expense for intangible assets	$ 11	$ 11	$ 9
Acquisition of intangible assets	$ 7
Weighted-average amortization period (years)	29 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Components of Intangible Assets) (Detail) - Computer Software, Intangible Asset [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,340	$ 1,033
Accumulated Amortization	549	363
Virginia Electric and Power Company
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	406	384
Accumulated Amortization	135	134
Dominion Energy Gas Holdings, LLC
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	178	179
Accumulated Amortization	$ 72	$ 64

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets (Annual Amortization Expense of Intangible Assets) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Finite-Lived Intangible Assets [Line Items]
2020	$ 88
2021	78
2022	70
2023	56
2024	49
Virginia Electric and Power Company
Finite-Lived Intangible Assets [Line Items]
2020	25
2021	19
2022	15
2023	8
2024	6
Dominion Energy Gas Holdings, LLC
Finite-Lived Intangible Assets [Line Items]
2020	9
2021	8
2022	8
2023	5
2024	$ 4

Regulatory Assets and Liabili_3

Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets-current		$ 879	$ 496
Regulatory assets-noncurrent		7,687	2,676
Total regulatory assets		$ 8,566	3,172
SCANA
Regulatory Assets [Line Items]
Electric service customers over period		20 years
DESC
Regulatory Assets [Line Items]
Debt issuance costs		$ 270
Weighted Average
Regulatory Assets [Line Items]
Weighted average useful life		27 years
Deferred cost of fuel used in electric generation
Regulatory Assets [Line Items]
Regulatory assets-current	[1]	$ 48	174
Regulatory assets-noncurrent	[1]		83
Unrecognized pension and other postretirement benefit costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[2]	1,431	1,497
Deferred project costs and DSM programs for gas utilities
Regulatory Assets [Line Items]
Regulatory assets-current	[3]	21	17
Unrecovered gas costs
Regulatory Assets [Line Items]
Regulatory assets-current	[4]	102	14
Deferred rate adjustment clause costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[5],[6],[7]	235	230
Deferred rate adjustment clause costs for Virginia electric utility
Regulatory Assets [Line Items]
Regulatory assets-current	[5],[7]	109	78
Deferred nuclear refueling outage costs
Regulatory Assets [Line Items]
Regulatory assets-current	[8]	68	69
NND Project costs
Regulatory Assets [Line Items]
Regulatory assets-current	[9]	138
Regulatory assets-noncurrent	[9]	2,503
PJM transmission rates
Regulatory Assets [Line Items]
Regulatory assets-current	[10]	121	45
Regulatory assets-noncurrent	[10]	85	192
Deferred project costs for gas utilities
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[3]	521	335
Interest rate hedges
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[11]	$ 741	184
Interest rate hedges | Weighted Average
Regulatory Assets [Line Items]
Weighted average useful life		30 years
AROs and related funding
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[12]	$ 311
Amortization period for deferred costs		105 years
Cost of reacquired debt
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[13],[14]	$ 262	3
Amortization period for deferred costs		26 years
Ash pond and landfill closure costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[15]	$ 1,016	27
Regulatory assets expected collection period commencing year		2021
Ash pond and landfill closure costs | Minimum
Regulatory Assets [Line Items]
Regulatory assets, amounts expected collection period		15 years
Ash pond and landfill closure costs | Maximum
Regulatory Assets [Line Items]
Regulatory assets, amounts expected collection period		18 years
Other
Regulatory Assets [Line Items]
Regulatory assets-current		$ 272	99
Regulatory assets-noncurrent		$ 582	125
Deferred Project Costs | Maximum
Regulatory Assets [Line Items]
Amortization period for deferred costs		18 months
Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current		$ 433	424
Regulatory assets-noncurrent		1,863	737
Total regulatory assets		2,296	1,161
Excess deferred taxes adjusted in charge of operating revenue		29
Excess deferred taxes adjusted in charge of operating revenue net of tax		22
Write off of regulatory asset		17
Write off of regulatory asset, after tax		$ 13
Virginia Electric and Power Company | Weighted Average
Regulatory Assets [Line Items]
Weighted average useful life		24 years
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation
Regulatory Assets [Line Items]
Regulatory assets-current	[16]	$ 48	174
Regulatory assets-noncurrent	[16]		83
Virginia Electric and Power Company | Deferred rate adjustment clause costs
Regulatory Assets [Line Items]
Regulatory assets-current	[17],[18]	109	78
Regulatory assets-noncurrent	[17],[18],[19]	235	230
Virginia Electric and Power Company | Deferred nuclear refueling outage costs
Regulatory Assets [Line Items]
Regulatory assets-current	[20]	68	69
Virginia Electric and Power Company | PJM transmission rates
Regulatory Assets [Line Items]
Regulatory assets-current	[21]	121	45
Regulatory assets-noncurrent	[21]	85	192
Virginia Electric and Power Company | Interest rate hedges
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[22]	404	151
Virginia Electric and Power Company | Ash pond and landfill closure costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[23]	$ 1,016	27
Regulatory assets expected collection period commencing year		2021
Virginia Electric and Power Company | Ash pond and landfill closure costs | Minimum
Regulatory Assets [Line Items]
Regulatory assets, amounts expected collection period		15 years
Virginia Electric and Power Company | Ash pond and landfill closure costs | Maximum
Regulatory Assets [Line Items]
Regulatory assets, amounts expected collection period		18 years
Virginia Electric and Power Company | Other
Regulatory Assets [Line Items]
Regulatory assets-current		$ 87	58
Regulatory assets-noncurrent		$ 123	54
Virginia Electric and Power Company | Deferred Project Costs | Maximum
Regulatory Assets [Line Items]
Amortization period for deferred costs		18 years
Dominion Energy Gas Holdings, LLC
Regulatory Assets [Line Items]
Regulatory assets-current	[24]	$ 8	8
Regulatory assets-noncurrent		40	52
Total regulatory assets		48	60
Dominion Energy Gas Holdings, LLC | Unrecognized pension and other postretirement benefit costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[25]		15
Dominion Energy Gas Holdings, LLC | Unrecovered gas costs
Regulatory Assets [Line Items]
Regulatory assets-current	[26]	2	1
Dominion Energy Gas Holdings, LLC | Interest rate hedges
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[27]	32	33
Dominion Energy Gas Holdings, LLC | Other
Regulatory Assets [Line Items]
Regulatory assets-current		6	7
Regulatory assets-noncurrent		$ 8	$ 4
[1]	Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[2]	Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy’s rate-regulated subsidiaries.
[3]	Primarily reflects amounts expected to be collected from or owed to gas customers in Dominion Energy’s service territories associated with current and prospective rider projects, including CEP, PIR and pipeline integrity management. See Note 13 for more information.
[4]	Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority.
[5]	As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) charge in operating revenue in the Consolidated Statements of Income for amounts which are probable of being returned to customers.
[6]	During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) to write-off the balance of a regulatory asset for which it is no longer seeking recovery.
[7]	Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information.
[8]	Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[9]	Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year period ending in 2039. See Note 3 for more information.
[10]	Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year period ending 2028 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter.
[11]	Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 27 years as of December 31, 2019.
[12]	Represents deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 106 years.
[13]	Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be remaining life of the reacquired debt. The reacquired debt costs had a weighted-average life of approximately 26 years as of December 31, 2019.
[14]	During 2019, DESC purchased certain of its first mortgage bonds as discussed in Note 18. As a result of these transactions, DESC incurred net costs, including write-offs of unamortized discount, premium and debt issuance costs, of $270 million.
[15]	Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCRs to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information.
[16]	Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[17]	As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) charge in operating revenue in the Consolidated Statements of Income for amounts which are probable of being returned to customers.
[18]	Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information.
[19]	During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) to write-off the balance of a regulatory asset for which it is no longer seeking recovery.
[20]	Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[21]	Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year period ending 2028 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter.
[22]	Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 24 years as of December 31, 2019.
[23]	Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 23 for additional information.
[24]	Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[25]	Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy Gas’ rate-regulated subsidiaries.
[26]	Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority.
[27]	Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted average useful life of approximately 30 years.

Regulatory Assets and Liabili_4

Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 497		$ 356
Regulatory liabilities-noncurrent		11,001		6,840
Total regulatory liabilities		11,498		7,196
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		167		299
Regulatory liabilities-noncurrent		5,074		4,647
Total regulatory liabilities		5,241		4,946
Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	41		24
Regulatory liabilities-noncurrent		800		765
Total regulatory liabilities		841		789
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[2]	142		117
Regulatory liabilities-noncurrent	[2]	2,302		1,409
Provision for future cost of removal and AROs | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	103		92
Provision for future cost of removal and AROs | Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	18		9
Regulatory liabilities-noncurrent	[1]	95		113
Reserve for refunds and rate credits to electric utility customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	143		71
Regulatory liabilities-noncurrent	[5]	656
Reserve for refunds and rate credits to electric utility customers | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[6]			71
Cost-of-service impact of 2017 Tax Reform Act
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[7]	4		104
Cost-of-service impact of 2017 Tax Reform Act | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[8]			95
Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		77	[9]	0
Regulatory liabilities-noncurrent	[9]	5,088		4,071
Income taxes refundable through future rates | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		54	[10]	0
Regulatory liabilities-noncurrent	[10]	2,438		2,579
Income taxes refundable through future rates | Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[11]	560		530
Monetization of guarantee settlement
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		67	[12]	0
Regulatory liabilities-noncurrent		970	[12]	0
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		64		64
Regulatory liabilities-noncurrent		325		170
Other | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		10		41
Regulatory liabilities-noncurrent		111		58
Other | Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		15		8
Regulatory liabilities-noncurrent		12		16
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[13]	1,471		1,070
Nuclear decommissioning trust | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[14]	1,471		1,070
Overrecovered other postretirement benefit costs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[15]	189		120
Overrecovered other postretirement benefit costs | Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[16]	133		106
Provision for future cost of removal | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[3]	1,054		940
Overrecovered gas costs | Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[17]	$ 8		$ 7
[1]	Current regulatory liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.
[2]	Rates charged to customers by Dominion Energy’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.
[3]	Rates charged to customers by Virginia Power’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.
[4]	Rates charged to customers by Dominion Energy Gas’ regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.
[5]	Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period in connection with the SCANA Merger Approval Order and Virginia legislation enacted in March 2018 that required one-time rate credits of certain amounts to utility customers in Virginia. See Notes 3 and 13 for additional information.
[6]	Charge associated with Virginia legislation enacted in March 2018 that required one-time rate credits of certain amounts to utility customers. See Note 13 for additional information.
[7]	Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at the Companies’ regulated electric generation and electric and natural gas distribution operations. See Notes 3 and 13 for additional information.
[8]	Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at regulated electric generation and distribution operations. See Note 13 for additional information.
[9]	Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.
[10]	Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.
[11]	Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.
[12]	Reflects amounts to be refunded to DESC electric service customers over a 20-year period ending in 2039 associated with the monetization of a bankruptcy settlement agreement. See Note 3 for additional information.
[13]	Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs.
[14]	Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs.
[15]	Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.
[16]	Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.
[17]	Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority.

Regulatory Assets and Liabili_5

Regulatory Assets and Liabilities (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Public Utilities General Disclosures [Line Items]
Regulatory assets past expenditures not earning return	$ 3,300
Period for which expenditures are expected to be recovered	2 years
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Regulatory assets past expenditures not earning return	$ 1,800
Dominion Energy Gas Holdings, LLC
Public Utilities General Disclosures [Line Items]
Regulatory assets past expenditures not earning return	$ 46

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Detail) MMcf in Millions

Feb. 01, 2020USD ($)mi

Jan. 01, 2020

Nov. 30, 2019

Nov. 01, 2019USD ($)

Sep. 30, 2019USD ($)

Aug. 31, 2019USD ($)

May 31, 2019USD ($)

Mar. 31, 2019USD ($)

Feb. 01, 2019USD ($)

Jan. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Nov. 30, 2018USD ($)miMW

Nov. 01, 2018USD ($)

Nov. 30, 2013mikV

Mar. 31, 2020USD ($)

Feb. 29, 2020USD ($)kV

Jan. 31, 2020USD ($)

Dec. 31, 2019USD ($)a

Nov. 30, 2019USD ($)

Oct. 31, 2019USD ($)

Sep. 30, 2019USD ($)

Aug. 31, 2019USD ($)

Jul. 31, 2019USD ($)

Jun. 30, 2019USD ($)

May 31, 2019USD ($)

Apr. 30, 2019MMcf

Mar. 31, 2019USD ($)

Jan. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Oct. 31, 2018USD ($)

Aug. 31, 2018USD ($)a

Jul. 31, 2018USD ($)a

May 31, 2017USD ($)

Jun. 30, 2015USD ($)

Jun. 30, 2019USD ($)

Dec. 31, 2018USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Aug. 31, 2018USD ($)a

Dec. 31, 2017USD ($)

Dec. 31, 2011

Public Utilities General Disclosures [Line Items]

Reduction in regulatory liabilities

$ 35,000,000

$ 4,200,000,000

Proposed revenue requirement

$ 83,000,000

Increase (decrease) in revenue requirement

$ 11

Number of new demand response programs | a

1

Amount of cost recovery

$ 186

Public utilities length of wind project | mi

27

Actual cumulative PREP Investment

$ 723,000,000

$ 723,000,000

$ 723,000,000

723,000,000

Impairment of assets and other charges

$ 1,535,000,000

403,000,000

15,000,000

Agreement to provide Dths per day of transportation service | a

150,000

150,000

Base fuel cost

$ 35,000,000

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

DETI

Public Utilities General Disclosures [Line Items]

The total estimated capital investment

$ 25,000,000

$ 25,000,000

Scenario, Forecast

Public Utilities General Disclosures [Line Items]

Increase decrease in annual base fuel component recoveries

$ 44,000,000

North Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

13,000,000

Return of equity percentage

9.75%

Ohio Regulation

Public Utilities General Disclosures [Line Items]

Projected capital investment

$ 200,000,000

Return of equity percentage

3.00%

Contract with customer credits taxreform

600,000,000

South Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ (20,000,000)

Wyoming Base Rate Case

Public Utilities General Disclosures [Line Items]

Return of equity percentage

10.50%

Percentage of earned return

9.05%

Authorized return percentage

9.85%

Wyoming Base Rate Case | Scenario, Forecast | Annual Base Fuel Revenues

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 19,000,000

Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Tax reform benefit

$ 100,000,000

$ 100,000,000

Reduction in regulatory liabilities

31,000,000

2,600,000,000

Impairment of assets and other charges

$ 160,000,000

$ 757,000,000

Submitted and approved decrease in base rate revenue

$ 14,000,000

Regulatory liabilities one time bill credit reduction amount

$ 13,000,000

Return of equity percentage

9.20%

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Virginia Electric and Power Company | Rider E

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 88,000,000

Increase (decrease) in revenue requirement

(16,000,000)

Virginia Electric and Power Company | Federal Energy Regulatory Commission | Operating Segments

Public Utilities General Disclosures [Line Items]

Proposed revenue requirement

$ 920,000,000

Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Proposed annual revenue reduction amount

$ 183,000,000

171,000,000

Annual revenue reduction amount

$ 183,000,000

Estimated annual revenue reduction on one-time customer credit

132,000,000

Interim rate reduction amount

$ 125,000,000

Rate reduction

$ 67,000,000

$ 63,000,000

One-time bill credit, provisions for current customers

200,000,000

Charge associated with legislation

215,000,000

Charge associated with legislation, after tax

160,000,000

Legislation amount credited in customer bill

$ 77,000,000

138,000,000

Proposed revenue requirement

1,200,000,000

1,500,000,000

Increase (decrease) in revenue requirement

(393,000,000)

$ 254,000,000

192,000,000

Return of equity percentage

10.75%

Proposed revenue requirement recovered balance

81,000,000

107,000,000

124,000,000

Virginia Electric and Power Company | Virginia Regulation | Transmission Component of Virginia Power's | Operating Segments

Public Utilities General Disclosures [Line Items]

Proposed revenue requirement

474,000,000

Virginia Electric and Power Company | Virginia Regulation | Coastal Virginia Offshore Wind Project

Public Utilities General Disclosures [Line Items]

The total estimated capital investment

$ 300,000,000

Capacity of wind turbine generators | MW

6

Virginia Electric and Power Company | Virginia Regulation | Surry Switching Station Transmission Line

Public Utilities General Disclosures [Line Items]

Length of kV line (miles) | mi

7

Capacity of transmission line (kV) | kV

500

Virginia Electric and Power Company | Virginia Regulation | Transmission Line from Skiffes Creek Switching Station to Wheaton Substation

Public Utilities General Disclosures [Line Items]

Length of kV line (miles) | mi

20

Virginia Electric and Power Company | Virginia Regulation | Transmission Line Near Gainesville Substation And Haymarket Substation

Public Utilities General Disclosures [Line Items]

Capacity of transmission line (kV) | kV

230

Virginia Electric and Power Company | Virginia Regulation | GTSA

Public Utilities General Disclosures [Line Items]

Operations and maintenance expenses

$ 78,000,000

102,000,000

Proposed cost of project

503,000,000

Estimated Cost of project

$ 68,000,000

816,000,000

Virginia Electric and Power Company | Virginia Regulation | Rider T1 | Operating Segments

Public Utilities General Disclosures [Line Items]

Proposed revenue requirement

446,000,000

Increase (decrease) in revenue requirement

$ 146,000,000

$ 271,000,000

Virginia Electric and Power Company | Virginia Regulation | Riders C1A C2A and C3A | Energy Efficiency Program | Operating Segments

Public Utilities General Disclosures [Line Items]

Approved revenue required

$ 60

Number of new energy efficiency programs | a

10

Period for cost cap

5 years

Virginia Electric and Power Company | Virginia Regulation | Rider E

Public Utilities General Disclosures [Line Items]

Approved revenue required

114,000,000

104,000,000

Virginia Electric and Power Company | Virginia Regulation | Rider E | Other operations and maintenance

Public Utilities General Disclosures [Line Items]

Audit compliance charge recognized in connection with preliminary recommendation

21,000,000

Audit compliance after-tax charge recognized in connection with preliminary recommendation

16,000,000

Virginia Electric and Power Company | Virginia Regulation | Solar Development Project

Public Utilities General Disclosures [Line Items]

The total estimated capital investment

$ 410,000,000

Number of solar facility | a

2

Virginia Electric and Power Company | Virginia Regulation | Solar Development Project | Rider US-3

Public Utilities General Disclosures [Line Items]

Solar capacity factor when normalized for force majeure events

25.00%

Virginia Electric and Power Company | Virginia Regulation | Solar Development Project | Rider US-3 | Operating Segments

Public Utilities General Disclosures [Line Items]

Proposed revenue requirement

$ 9,000,000

$ 10,000,000

Virginia Electric and Power Company | Virginia Regulation | Solar Development Project | Rider US-3 | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

20 years

20 years

Virginia Electric and Power Company | Virginia Regulation | Solar Development Project | Rider US-3 | Operating Segments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

20 years

Virginia Electric and Power Company | Virginia Regulation | Battery Storage Pilot

Public Utilities General Disclosures [Line Items]

Estimated Cost of project

$ 35,000,000

Virginia Electric and Power Company | Virginia Regulation | Maximum

Public Utilities General Disclosures [Line Items]

Rate reduction

$ 50,000,000

Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Solar Development Project | Rider US-3 | Operating Segments

Public Utilities General Disclosures [Line Items]

Solar capacity factor when normalized for force majeure events

22.00%

Virginia Electric and Power Company | Virginia Regulation | Third Phase | Rider U

Public Utilities General Disclosures [Line Items]

Projected capital investment

$ 123,000,000

Virginia Electric and Power Company | Virginia Regulation | Second Phase | Rider U

Public Utilities General Disclosures [Line Items]

Projected capital investment

52,000,000

Virginia Electric and Power Company | North Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 18,000,000

Return of equity percentage

10.75%

Percentage of earned return

7.52%

Authorized return percentage

9.90%

Virginia Electric and Power Company | North Carolina Regulation | Annual Base Fuel Revenues

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 27,000,000

$ 24,000,000

DETI

Public Utilities General Disclosures [Line Items]

Expected cost of project

$ 95,000,000

DETI | Federal Energy Regulatory Commission | Supply Header Project | Atlantic Coast Pipeline

Public Utilities General Disclosures [Line Items]

Annual electric power cost rate adjustment, approval amount requested to recover amount

10,000,000

Annual transportation cost rate adjustment, approval amount requested to recover amount

$ 38,000,000

DETI | Federal Energy Regulatory Commission | Preliminary recommendation one | Other operations and maintenance

Public Utilities General Disclosures [Line Items]

Audit compliance charge recognized in connection with preliminary recommendation

129,000,000

Audit compliance after-tax charge recognized in connection with preliminary recommendation

94,000

Questar Gas

Public Utilities General Disclosures [Line Items]

Return of equity percentage

9.50%

Base fuel cost

$ 4,000,000

Questar Gas | Cost-of-service impact of 2017 Tax Reform Act

Public Utilities General Disclosures [Line Items]

Reduction in regulatory liabilities

$ 15,000,000

Refund to customers related to deferred corporate income tax reduction

$ 9,000,000

Questar Gas | Utah Regulation [Member]

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 3,000,000

Questar Gas | Utah and Wyoming Regulation | Fuel Deferral

Public Utilities General Disclosures [Line Items]

LNG storage facility, liquefaction rate per day | MMcf

8.2

Questar Gas | Wyoming Base Rate Case

Public Utilities General Disclosures [Line Items]

Return of equity percentage

10.50%

Percentage of earned return

7.46%

Authorized return percentage

9.50%

East Ohio

Public Utilities General Disclosures [Line Items]

Percentage of debt rate of pipeline system

6.50%

East Ohio | Ohio Regulation | Pipeline Infrastructure Replacement Program

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 190,000,000

Total estimated cost

202,000,000

$ 1,600,000

202,000,000

202,000,000

1,600,000

202,000,000

Hope Gas, Inc. | PREP

Public Utilities General Disclosures [Line Items]

Projected capital investment

29,000,000

Hope Gas, Inc. | Scenario, Forecast | PREP

Public Utilities General Disclosures [Line Items]

Projected capital investment

$ 39,000,000

Hope Gas, Inc. | West Virginia Regulation | PREP

Public Utilities General Disclosures [Line Items]

Amount of cost recovery

$ 10,000,000

30,000,000

Cove Point | Federal Energy Regulatory Commission

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 1,000,000

Annual transportation cost rate adjustment, approval amount requested to recover amount

$ 182,000,000

$ 25,000,000

Estimated Cost of project

45,000,000

Impairment of assets and other charges

37,000,000

Asset impairment after tax charge

$ 28,000,000

$ 28,000,000

28,000,000

28,000,000

Cove Point | Federal Energy Regulatory Commission | Supply Header Project | Atlantic Coast Pipeline

Public Utilities General Disclosures [Line Items]

Annual transportation cost rate adjustment, approval amount requested to recover amount

$ 24,000,000

Public utilities expected cost to acquire productive assets

$ 150,000,000

Dominion Energy South Carolina Inc | Scenario, Forecast

Public Utilities General Disclosures [Line Items]

Electric transmission projects Costs

$ 75,000,000

Dominion Energy South Carolina Inc | Scenario, Forecast | Transmission Lines in Aiken County South Carolina

Public Utilities General Disclosures [Line Items]

Electric transmission projects Costs

$ 30,000,000

Dominion Energy South Carolina Inc | Virginia Regulation | Transmission Lines in Aiken County South Carolina

Public Utilities General Disclosures [Line Items]

Length of kV line (miles) | mi

28

Capacity of transmission line (kV) | kV

230

Dominion Energy South Carolina Inc | South Carolina Regulation

Public Utilities General Disclosures [Line Items]

Total revenue requirement

437,000,000

Approved revenue required

$ 436,000,000

Annual transportation cost rate adjustment, approval amount requested to recover amount

$ 40,000,000

Increase in natural gas rate

7,000,000

Dominion Energy Gas Holdings, LLC

Public Utilities General Disclosures [Line Items]

Reduction in regulatory liabilities

(8,000,000)

1,100,000,000

Impairment of assets and other charges

$ 219,000,000

$ 13,000,000

$ 163,000,000

$ 15,000,000

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01

Public Utilities General Disclosures [Line Items]

Performance guarantee of the facilities

1 year

1 year

Dominion Energy Gas Holdings, LLC | Federal Energy Regulatory Commission | Supply Header Project | Subsidiaries

Public Utilities General Disclosures [Line Items]

Impairment of assets and other charges

13,000,000

Asset impairment after tax charge

$ 10,000,000

$ 10,000,000

Ohio Regulation

Public Utilities General Disclosures [Line Items]

Tax Reform Act's impact on its equity return

$ 19,000,000

Regulatory Matters - Summary of

Regulatory Matters - Summary of Additional Significant Riders Associated with Various Virginia Power Projects (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in revenue requirement	$ 11
Rider S | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Rate Year Beginning		2020-04
Total Revenue Requirement (millions)		$ 195,000,000
Increase (decrease) in revenue requirement		$ (20,000,000)
Rider GV | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-05
Approval Date		February 2020
Rate Year Beginning		2020-04
Total Revenue Requirement (millions)		$ 132,000,000
Increase (decrease) in revenue requirement		$ 12,000,000
Rider W | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-05
Approval Date		February 2020
Rate Year Beginning		2020-04
Total Revenue Requirement (millions)		$ 106,000,000
Increase (decrease) in revenue requirement		$ 1,000,000
Rider R | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-05
Approval Date		February 2020
Rate Year Beginning		2020-04
Total Revenue Requirement (millions)		$ 44,000,000
Increase (decrease) in revenue requirement		$ (13,000,000)
Rider B | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-05
Approval Date		February 2020
Rate Year Beginning		2020-04
Total Revenue Requirement (millions)		$ 32,000,000
Increase (decrease) in revenue requirement		$ (6,000,000)
Rider US-3 | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-07
Approval Date		Pending
Rate Year Beginning		2020-06
Total Revenue Requirement (millions)		$ 31,000,000
Increase (decrease) in revenue requirement		$ 21,000,000
Rider BW | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-10
Approval Date		Pending
Rate Year Beginning		2020-09
Total Revenue Requirement (millions)		$ 120,000,000
Increase (decrease) in revenue requirement		$ 1,000,000
Rider US-2 | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2019-10
Approval Date		Pending
Rate Year Beginning		2020-09
Total Revenue Requirement (millions)		$ 10,000,000
Increase (decrease) in revenue requirement		$ (5,000,000)
Rider E | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Application Date		2020-01
Approval Date		Pending
Rate Year Beginning		2020-11
Total Revenue Requirement (millions)		$ 88,000,000
Increase (decrease) in revenue requirement		$ (16,000,000)

Regulatory Matters - Summary _2

Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)mikV
Rebuild and operate between Lanexa and the Northern Neck in Virginia
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
The total estimated capital investment | $	$ 30
Virginia Electric and Power Company | Build a new substation and connect three existing transmission lines thereto in Fluvanna County, Virginia
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Rebuild and operate the Glebe substation and relocate and operate in Arlington County, Virginia and the City of Alexandria, Virginia existing overhead line underground
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Rebuild and operate between Valley, Virginia and Mt. Storm, West Virginia
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	500
Virginia Electric and Power Company | Rebuild and operate between the Suffolk and the Virginia/North Carolina state line
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Rebuild and operate five segments between the Loudoun and Ox substations
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Build new switching station and line loop in Loudon County, Virginia (Evergreen Mills)
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Build new substation and line loop in Loudon County, Virginia (Lockridge)
Public Utilities, General Disclosures [Line Items]
Capacity of transmission line (kV) | kV	230
Virginia Electric and Power Company | Virginia Regulation | Rebuild and operate between Lanexa and the Northern Neck in Virginia
Public Utilities, General Disclosures [Line Items]
Application Date	2018-06
Length of kV line (miles) | mi	3
Virginia Electric and Power Company | Virginia Regulation | Build a new substation and connect three existing transmission lines thereto in Fluvanna County, Virginia
Public Utilities, General Disclosures [Line Items]
Approval Date	2019-06
Length of kV line (miles) | mi	1
The total estimated capital investment | $	$ 30
Virginia Electric and Power Company | Virginia Regulation | Rebuild and operate the Glebe substation and relocate and operate in Arlington County, Virginia and the City of Alexandria, Virginia existing overhead line underground
Public Utilities, General Disclosures [Line Items]
Application Date	2019-03
Length of kV line (miles) | mi	1
The total estimated capital investment | $	$ 125
Virginia Electric and Power Company | Virginia Regulation | Rebuild and operate between Valley, Virginia and Mt. Storm, West Virginia
Public Utilities, General Disclosures [Line Items]
Application Date	2019-04
Approval Date	2019-11
Length of kV line (miles) | mi	65
The total estimated capital investment | $	$ 290
Virginia Electric and Power Company | Virginia Regulation | Rebuild and operate between the Suffolk and the Virginia/North Carolina state line
Public Utilities, General Disclosures [Line Items]
Application Date	2019-05
Approval Date	2019-11
Length of kV line (miles) | mi	11
The total estimated capital investment | $	$ 20
Virginia Electric and Power Company | Virginia Regulation | Rebuild and operate five segments between the Loudoun and Ox substations
Public Utilities, General Disclosures [Line Items]
Application Date	2019-08
Approval Date	Pending
Length of kV line (miles) | mi	19
The total estimated capital investment | $	$ 70
Virginia Electric and Power Company | Virginia Regulation | Build new switching station and line loop in Loudon County, Virginia (Evergreen Mills)
Public Utilities, General Disclosures [Line Items]
Approval Date	Pending
Length of kV line (miles) | mi	2
Virginia Electric and Power Company | Virginia Regulation | Build new substation and line loop in Loudon County, Virginia (Lockridge)
Public Utilities, General Disclosures [Line Items]
Application Date	2019-12
Approval Date	Pending
Length of kV line (miles) | mi	1
The total estimated capital investment | $	$ 30
Virginia Electric and Power Company | Virginia Regulation | Rebuild of overhead transmission lines between Chesterfield Substation and Tyler Substation in Chesterfield County, Virginia
Public Utilities, General Disclosures [Line Items]
The total estimated capital investment | $	$ 35

Asset Retirement Obligations (C

Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Asset Retirement Obligations [Line Items]
AROs, Beginning balance		$ 2,532	[1]	$ 2,432
Obligations incurred during the period		2,413	[2]	20
Obligations settled during the period		(137)		(159)
AROs acquired in the SCANA Combination		577
Revisions in estimated cash flows		(324)	[3]	120	[2]
Accretion		213		119
AROs, Ending balance	[1]	5,274		2,532
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
AROs, Beginning balance		1,445		1,365
Obligations incurred during the period		2,408	[2]	14
Obligations settled during the period		(81)		(119)
Revisions in estimated cash flows		(323)	[3]	120	[2]
Accretion		132		65
AROs, Ending balance		3,581		1,445
Dominion Energy Gas Holdings, LLC
Asset Retirement Obligations [Line Items]
AROs, Beginning balance		88	[4]	85
Obligations incurred during the period				3
Obligations settled during the period		(3)		(6)
Accretion		4		6
AROs, Ending balance	[4]	$ 89		$ 88
[1]	Includes $282 million and $408 million reported in other current liabilities at December 31, 2018, and 2019, respectively.
[2]	Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.
[3]	Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities as well as revisions for 20 year license extensions for regulated nuclear power stations in Virginia.
[4]	Includes $74 million and $75 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and 2019, respectively.

Asset Retirement Obligations _2

Asset Retirement Obligations (Changes to AROs) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	$ 4,866	$ 2,250
Current Liabilities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, current	408	282
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	3,241	1,200
Asset retirement obligation, current	$ 340	245
License extension term	20 years
Dominion Energy Gas Holdings, LLC | Other Deferred Credits And Other Liabilities
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	$ 75	$ 74

Asset Retirement Obligations (N

Asset Retirement Obligations (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds	$ 6,192		$ 4,938
Asset Retirement Obligation, Liabilities Incurred	2,413	[1]	20
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds	2,881		2,369
Asset Retirement Obligation, Liabilities Incurred	2,408	[1]	14
D Virginia Electric And Power Company [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation, Liabilities Incurred	1,700		1,600
D Virginia Electric And Power Company [Member] | Future Decommissioning Of Nuclear Facilities [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation, Liabilities Incurred	800		$ 900
D Virginia Electric And Power Company [Member] | D Cost Of Landfills And Beneficial Reuse [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation, Liabilities Incurred	$ 2,600
[1]	Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.

Leases (Lease Assets and Liabil

Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Jan. 01, 2019	Dec. 31, 2018
Lessee Lease Disclosure [Line Items]
Operating lease assets		$ 499	[1]	$ 504
Finance lease assets	[2]	140
Total lease assets		639
Operating lease liabilities	[3]	59
Finance lease liabilities	[4]	29
Total lease liabilities - current		88
Operating lease liabilities	[5]	442
Finance lease liabilities		105			$ 35
Total lease liabilities - noncurrent		547
Total lease liabilities		635
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Operating lease assets		212	[1]	209
Finance lease assets	[2]	19
Total lease assets		231
Operating lease liabilities	[3]	30
Finance lease liabilities	[4]	3
Total lease liabilities - current		33
Operating lease liabilities	[5]	180
Finance lease liabilities		16			1
Total lease liabilities - noncurrent		196
Total lease liabilities		229
Dominion Energy Gas Holdings, LLC
Lessee Lease Disclosure [Line Items]
Operating lease assets		37	[1]	$ 64
Finance lease assets	[2]	6
Total lease assets		43
Operating lease liabilities	[3]	6
Finance lease liabilities	[4]	1
Total lease liabilities - current		7
Operating lease liabilities	[5]	29
Finance lease liabilities		5			$ 0
Total lease liabilities - noncurrent		34
Total lease liabilities		$ 41
[1]	Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.
[2]	Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $27 million, $4 million and $1 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at December 31, 2019.
[3]	Included in other current liabilities in the Companies’ Consolidated Balance Sheets.
[4]	Included in securities due within one year in the Companies’ Consolidated Balance Sheets.
[5]	Included in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.

Leases (Lease Assets and Liab_2

Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Lessee Lease Disclosure [Line Items]
Finance lease assets, accumulated amortization	$ 27
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Finance lease assets, accumulated amortization	4
Dominion Energy Gas Holdings, LLC
Lessee Lease Disclosure [Line Items]
Finance lease assets, accumulated amortization	$ 1

Leases (Narrative) (Detail)

Leases (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2016
Leases Disclosure [Line Items]
Property, Plant and Equipment, Net	$ 69,082	$ 54,560
Accumulated depreciation, depletion and amortization	28,384	$ 22,018
Power Purchase Arrangement [Member]
Leases Disclosure [Line Items]
Property, Plant and Equipment, Net	2,800
Accumulated depreciation, depletion and amortization	364
Rental revenue	174
Depreciation expense	$ 94
New Corporate Office [Member] | Agreement with Lessor to Construct and Lease Corporate Office Property
Leases Disclosure [Line Items]
Lease term	51 months
Required percentage payment to lessor for difference between project costs and sales proceeds	83.00%
Required percentage payment for specific full recourse events	100.00%
Required percentage payment of funded amount under certain events of default	89.90%
Lessor | Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property
Leases Disclosure [Line Items]
Amount of financing commitments to fund estimated project costs			$ 365
Lessor | New Corporate Office [Member] | Agreement with Lessor to Construct and Lease Corporate Office Property
Leases Disclosure [Line Items]
Amount of financing commitments to fund estimated project costs	$ 465

Leases (Summary of Total Lease

Leases (Summary of Total Lease Cost) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Finance lease cost:
Finance lease cost, Amortization	$ 20
Finance lease cost, Interest	4
Operating lease cost	87
Short-term lease cost	30
Variable lease cost	6
Total lease cost	147
Virginia Electric and Power Company
Finance lease cost:
Operating lease cost	41
Short-term lease cost	13
Variable lease cost	2
Total lease cost	56
Dominion Energy Gas Holdings, LLC
Finance lease cost:
Operating lease cost	7
Short-term lease cost	7
Total lease cost	$ 14

Leases (Cash Paid for Amounts I

Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Lessee Lease Disclosure [Line Items]
Operating cash flows for finance leases	$ 4
Operating cash flows for operating leases	121
Financing cash flows for finance leases	20
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Operating cash flows for operating leases	56
Dominion Energy Gas Holdings, LLC
Lessee Lease Disclosure [Line Items]
Operating cash flows for operating leases	$ 14

Leases (Weighted Average Remain

Leases (Weighted Average Remaining Lease Term and Weighted Discounted Rate for Finance and Operating Leases) (Detail)	Dec. 31, 2019
Lessee Lease Disclosure [Line Items]
Weighted average discount rate - finance leases	3.84%
Weighted average discount rate - operating leases	4.47%
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Weighted average discount rate - finance leases	4.12%
Weighted average discount rate - operating leases	4.29%
Dominion Energy Gas Holdings, LLC
Lessee Lease Disclosure [Line Items]
Weighted average remaining lease term - finance leases	6 years
Weighted average remaining lease term - operating leases	11 years
Weighted average discount rate - finance leases	4.08%
Weighted average discount rate - operating leases	4.37%

Leases (Scheduled Maturities of

Leases (Scheduled Maturities of Lease Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2020	$ 72
Maturity of Lease Liabilities, Operating, 2021	65
Maturity of Lease Liabilities, Operating, 2022	55
Maturity of Lease Liabilities, Operating, 2023	45
Maturity of Lease Liabilities, Operating, 2024	36
Maturity of Lease Liabilities, Operating, After 2024	582
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	855
Present value adjustment, Operating	(377)
Present value of lease liabilities, Operating	478
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2020	34
Maturity of Lease Liabilities, Finance, 2021	31
Maturity of Lease Liabilities, Finance, 2022	29
Maturity of Lease Liabilities, Finance, 2023	26
Maturity of Lease Liabilities, Finance, 2024	19
Maturity of Lease Liabilities, Finance, After 2024	9
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	148
Present value adjustment, Finance	(14)
Present value of lease liabilities, Finance	134	$ 39
Virginia Electric And Power Company [Member]
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2020	34
Maturity of Lease Liabilities, Operating, 2021	30
Maturity of Lease Liabilities, Operating, 2022	24
Maturity of Lease Liabilities, Operating, 2023	19
Maturity of Lease Liabilities, Operating, 2024	14
Maturity of Lease Liabilities, Operating, After 2024	205
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	326
Present value adjustment, Operating	(139)
Present value of lease liabilities, Operating	187
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2020	4
Maturity of Lease Liabilities, Finance, 2021	4
Maturity of Lease Liabilities, Finance, 2022	4
Maturity of Lease Liabilities, Finance, 2023	3
Maturity of Lease Liabilities, Finance, 2024	3
Maturity of Lease Liabilities, Finance, After 2024	4
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	22
Present value adjustment, Finance	(3)
Present value of lease liabilities, Finance	19
Dominion Energy Gas Holdings L L C [Member]
Maturity of Operating Lease Liabilities
Maturity of Lease Liabilities, Operating, 2020	7
Maturity of Lease Liabilities, Operating, 2021	6
Maturity of Lease Liabilities, Operating, 2022	5
Maturity of Lease Liabilities, Operating, 2023	4
Maturity of Lease Liabilities, Operating, 2024	3
Maturity of Lease Liabilities, Operating, After 2024	20
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	45
Present value adjustment, Operating	(10)
Present value of lease liabilities, Operating	35
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities, Finance, 2020	2
Maturity of Lease Liabilities, Finance, 2021	1
Maturity of Lease Liabilities, Finance, 2022	1
Maturity of Lease Liabilities, Finance, 2023	1
Maturity of Lease Liabilities, Finance, 2024	1
Maturity of Lease Liabilities, Finance, After 2024	1
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	7
Present value adjustment, Finance	(1)
Present value of lease liabilities, Finance	$ 6

Variable Interest Entities - (N

Variable Interest Entities - (Narrative) (Detail) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)MWGenerators	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Feb. 29, 2020
Atlantic Coast Pipeline
Variable Interest Entity [Line Items]
Percentage of ownership interest acquired						5.00%
Southern Company Gas | Dominion Energy Midstream Partners, LP | Atlantic Coast Pipeline
Variable Interest Entity [Line Items]
Minority Interest Ownership Percentage By Parent						53.00%
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Merchant Solar Projects
Variable Interest Entity [Line Items]
Initial membership interest percentage			67.00%
Variable Interest Entity, Not Primary Beneficiary | Gas Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline
Variable Interest Entity [Line Items]
Initial membership interest percentage			48.00%
SBL Holdco | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Securities due within one year			$ 31
Long term debt			267
Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Securities due within one year			4	$ 350
Long term debt			12,325	11,320
Payables to affiliates			210	209
Virginia Electric and Power Company | Variable Interest Entity, Not Primary Beneficiary | DES
Variable Interest Entity [Line Items]
Payables to affiliates			102	107
Shared Services Purchased			$ 387	119	$ 335
Virginia Electric and Power Company | Variable Interest Entity (VIE) or Potential VIE, Information Unavailability
Variable Interest Entity [Line Items]
Long term capacity contract non utility generators (generators) | Generators			1
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW			218
Payment for electric capacity			$ 13	50	86
Payment for electric energy			1	18	24
Payment for contract termination	$ 135	$ 135
Payment for contract termination after tax		$ 100
Dominion Energy Gas Holdings, LLC
Variable Interest Entity [Line Items]
Securities due within one year			700	748
Long term debt			4,821	7,022
Payables to affiliates			$ 82	124
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream Partners, LP
Variable Interest Entity [Line Items]
Percentage of limited partner interests in Cove Point			75.00%
Minority Interest Ownership Percentage By Parent			25.00%
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DES
Variable Interest Entity [Line Items]
Payables to affiliates			$ 27	43
Shared Services Purchased			106	340	106
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DECGS And DEQPS
Variable Interest Entity [Line Items]
Payables to affiliates			15	6
Shared Services Purchased			$ 49	$ 45	$ 45

Short-Term Debt and Credit Ag_2

Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($)		1 Months Ended		12 Months Ended
		Nov. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt maximum borrowing capacity	[1]			$ 6,000,000,000				$ 6,000,000,000
Questar Gas
Debt Instrument [Line Items]
Debt maximum borrowing capacity				250,000,000
Dominion Energy Midstream Partners, LP
Debt Instrument [Line Items]
Credit facility, outstanding amount							$ 73,000,000
Dominion Energy South Carolina Inc
Debt Instrument [Line Items]
Debt maximum borrowing capacity					$ 2,200,000,000
South Carolina Generating Company Inc
Debt Instrument [Line Items]
Debt maximum borrowing capacity					$ 200,000,000
Six Billion Joint Revolving Credit Facility | Dominion Energy Midstream Partners, LP
Debt Instrument [Line Items]
Debt maximum borrowing capacity							500,000,000
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco
Debt Instrument [Line Items]
Debt maximum borrowing capacity				30,000,000
Credit Facilities Maturing In May 2018 With 1 Year Automatic Renewals Through 2024 [Member] | Dominion Solar Projects III, Inc
Debt Instrument [Line Items]
Debt maximum borrowing capacity				25,000,000
Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount			$ 3,000,000,000					$ 3,000,000,000
Weighted average useful life			364 days
Term Loan Due in 2021 | Dominion Energy Questar Corporation
Debt Instrument [Line Items]
Repayments of principal		$ 1,000,000,000		2,000,000,000
Term Loan Due in 2021 | Cove Point
Debt Instrument [Line Items]
Repayments of principal				3,000,000,000
Letter of Credit
Debt Instrument [Line Items]
Debt maximum borrowing capacity							$ 21,000,000
Credit facility, outstanding amount				$ 21,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt maximum borrowing capacity						$ 700,000,000
[1]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.

Short-Term Debt and Credit Ag_3

Short-Term Debt and Credit Agreements (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Facility Limit	[1]	$ 6,000	$ 6,000
Outstanding Commercial Paper	[1],[2]	836	324
Outstanding Letters of Credit	[1]	89	88
Facility capacity available	[1]	5,075	5,588
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	[3]	6,000	6,000
Outstanding Commercial Paper	[3],[4]	243	314
Outstanding Letters of Credit	[3]	7	16
Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	[5]	1,500	1,500
Outstanding Commercial Paper	[5],[6]	$ 62	$ 10
[1]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	The weighted-average interest rates of the outstanding commercial paper supported by Dominion Energy’s credit facility was 2.10% and 2.93% at December 31, 2019 and 2018, respectively.
[3]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[4]	The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 2.10% and 2.94% at December 31, 2019 and 2018, respectively.
[5]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[6]	The weighted-average interest rates of the outstanding commercial paper supported by the credit facility was 1.98% and 2.58% at December 31, 2019 and 2018, respectively.

Short-Term Debt and Credit Ag_4

Short-Term Debt and Credit Agreements (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail) - USD ($)		Dec. 31, 2019	Feb. 28, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Weighted-average percentage interest rates	[1],[2],[3]	1.65%
Facility Limit	[4]	$ 6,000,000,000		$ 6,000,000,000
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	[5]	6,000,000,000		6,000,000,000
Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	[6]	1,500,000,000		$ 1,500,000,000
Credit Facility One Point Five Billion [Member] | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit		1,500,000,000
Letter of Credit
Line of Credit Facility [Line Items]
Facility Limit			$ 21,000,000
Letter of Credit | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit		1,500,000,000
Letter of Credit | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member]
Line of Credit Facility [Line Items]
Facility Limit		2,000,000,000
Letter of Credit | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit		1,500,000,000
Letter of Credit | Six Billion Joint Revolving Credit Facility | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit		2,000,000,000
Line of Credit | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit		$ 750,000,000
Commercial Paper | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member]
Line of Credit Facility [Line Items]
Weighted-average percentage interest rates		2.10%		2.93%
Commercial Paper | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member] | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Weighted-average percentage interest rates		2.10%		2.94%
Commercial Paper | 1 Billion, 500 Million And 1.5 Billion Joint Revolving Credit Facilities [Member] | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Weighted-average percentage interest rates		1.98%		2.58%
[1]	In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released.
[2]	Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.
[3]	Represents weighted-average coupon rates for debt outstanding as of December 31, 2019.
[4]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[5]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[6]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

Long-Term Debt (Total Long Term

Long-Term Debt (Total Long Term Debt) (Detail) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[1],[2],[3]	1.65%
Total principal		$ 37,118		$ 35,070
Securities due within one year	[4],[5],[6],[7]	(3,133)		(3,624)
Unamortized discount and debt issuance costs		(270)		(248)
Total long term debt		33,824		31,144
Fair value hedge valuation		4		(20)	[8]
Credit facility borrowings	[9]			(73)
Dominion Energy, Inc. total long-term debt		33,824		31,144
Finance Lease, Liability		$ 134		39
4.82%, due 2042
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[10]	4.82%
Total principal		$ 345	[10]	362
Term loans, variable rates, due 2023 and 2024
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[10]	4.24%
Total principal		$ 527	[10]	582
Long term debt due within one year
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[4],[5],[7],[11]	3.41%
Senior Notes | Variable rates, due 2019 and 2020
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		2.31%
Total principal		$ 300		800
Senior Notes | 1.6% to 7.0%, due 2019 to 2049
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[12]	4.15%
Total principal	[12]	$ 7,688		7,488
Tax Exempt Financing | 3.625% and 4.00%, due 2028 and 2033
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[2],[3]	3.90%
Total principal	[2]	$ 54
Tax Exempt Financing | Variable Rate Due 2038
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[2],[3]	1.65%
Total principal	[2]	$ 35
Tax Exempt Financing | Other
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[2]	3.69%
Total principal	[2]	$ 1
Tax Exempt Financing | Tax-Exempt Financing, 1.7% due 2033
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		1.70%
Total principal		$ 27		27
Tax Exempt Financing | GENCO variable rate due 2038 [Member]
Debt Instrument [Line Items]
Total principal	[1],[2]	$ 33
Unsecured junior subordinated notes | 8.4% due 2031
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		8.40%
Total principal		$ 10		10
Unsecured junior subordinated notes | 2.579% to 4.104%, due 2019 to 2024 [Member]
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		3.01%
Total principal		$ 2,950		2,100
Enhanced Junior Subordinated Notes | Variable rates, due 2066
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[4]	4.41%
Total principal	[4]	$ 397		422
Enhanced Junior Subordinated Notes | 5.25% and 5.75%, due 2054 and 2076
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		5.48%
Total principal		$ 1,485		1,485
Remarketable subordinated notes | 2.0%, due 2021 and 2024
Debt Instrument [Line Items]
Total principal				1,400
Questar Gas | 2.98% to 7.20%, due 2024 to 2051
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		4.25%
Total principal		$ 750		750
SCANA | Unsecured Senior Notes, variable rate, due 2034
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[11]	2.61%
Total principal	[6]	$ 66
SCANA | 4.125% to 6.25%, due 2020 to 2022
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[5],[13]	5.06%
Total principal	[5],[13]	$ 508
PSNC | 4.13% to 7.45%, due 2020 to 2047
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		5.05%
Total principal		$ 700
DESC | First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[14]	5.42%
Total principal	[14]	$ 3,267
Dominion Energy Gas Holdings, LLC
Debt Instrument [Line Items]
Total principal		5,561		7,890
Securities due within one year		(699)		(748)
Unamortized discount and debt issuance costs		(41)		(47)
Total long term debt		4,826		7,022
Credit facility borrowings	[9]			(73)
Dominion Energy, Inc. total long-term debt		4,826		7,022
Finance Lease, Liability		$ 6
Dominion Energy Gas Holdings, LLC | Long term debt due within one year
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		2.80%
Dominion Energy Gas Holdings, LLC | Senior Notes | Unsecured senior notes Variable rate, due 2021 [Member]
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		2.49%
Total principal		$ 500		500
Dominion Energy Gas Holdings, LLC | Senior Notes | 2.5% to 3.55%, due 2019 to 2023
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[15]	3.44%
Total principal		$ 4,631		3,587
Dominion Energy Gas Holdings, LLC | Senior Notes | Cove Point, term loan, due 2021
Debt Instrument [Line Items]
Total principal	[16]			3,000
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Revolving credit agreement variable rates due 2021
Debt Instrument [Line Items]
Total principal	[9]			73
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		4.23%
Total principal		$ 430		430
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Term loan, variable rate, due 2019
Debt Instrument [Line Items]
Total principal				300
Virginia Electric and Power Company
Debt Instrument [Line Items]
Total principal		12,414		11,754
Securities due within one year		(1)		(350)
Unamortized discount and debt issuance costs		(88)		(83)
Total long term debt		12,341		11,321
Dominion Energy, Inc. total long-term debt		12,341		11,321
Finance Lease, Liability		$ 19
Virginia Electric and Power Company | Long term debt due within one year
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		4.29%
Virginia Electric and Power Company | Senior Notes | 2.75% to 8.875%, due 2019 to 2049
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)		4.27%
Total principal		$ 11,789		11,090
Virginia Electric and Power Company | Tax Exempt Financing | 1.80% to 5.0%, due 2023 to 2041
Debt Instrument [Line Items]
2019 Weighted- average Coupon (percentage)	[3],[17],[18]	2.02%
Total principal	[17],[18]	$ 625		$ 664
[1]	In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released.
[2]	Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.
[3]	Represents weighted-average coupon rates for debt outstanding as of December 31, 2019.
[4]	In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[5]	In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[6]	In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[7]	Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc.
[8]	Represents the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt.
[9]	In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018.
[10]	Represents debt associated with Eagle Solar, SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s, SBL Holdco’s and Dominion Solar Projects III, Inc’s interest in certain solar facilities.
[11]	In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. As such, this borrowing are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[12]	Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[13]	In March 2019, SCANA purchased certain of its medium term notes having an aggregate purchase price of $300 million pursuant to tender offer that expired in the first quarter of 2019.
[14]	In February, March and September 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.8 billion pursuant to tender offers. The February and March tender offers expired in the first quarter of 2019 and the September tender offer expired in the third quarter of 2019.
[15]	Amount includes foreign currency remeasurement adjustments.
[16]	In September 2019, Cove Point repaid its $3.0 billion term loan due in 2021.
[17]	In May 2019, Virginia Power redeemed its $40 million 5.0% Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 at the principal outstanding plus accrued interest.
[18]	These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

Long-Term Debt (Total Long Te_2

Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) $ in Millions

Feb. 01, 2020

Mar. 31, 2020

Feb. 29, 2020

Sep. 30, 2019

May 31, 2019

Mar. 31, 2019

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Jun. 30, 2019

Debt Instrument [Line Items]

Repayment of Debt

$ 9,116

$ 5,682

$ 1,572

Total principal

37,118

35,070

Term loans

Debt Instrument [Line Items]

Estimated mandatory prepayments due within one year

20

Dominion Energy Gas Holdings, LLC

Debt Instrument [Line Items]

Repayment of Debt

3,750

255

Total principal

5,561

7,890

Virginia Electric and Power Company

Debt Instrument [Line Items]

Repayment of Debt

591

964

$ 681

Total principal

$ 12,414

11,754

SCANA [Member]

Debt Instrument [Line Items]

Repurchase of medium term notes

$ 300

DESC

Debt Instrument [Line Items]

Repurchase of first mortgage bonds

$ 1,800

September 2006 hybrids

Debt Instrument [Line Items]

Debt, amount redeemed

$ 286

September 2006 hybrids | Subsequent Event

Debt Instrument [Line Items]

Repayment of Debt

$ 286

June 2006 hybrids

Debt Instrument [Line Items]

Debt Instrument, Face Amount

13

Debt, amount redeemed

$ 111

June 2006 hybrids | Subsequent Event

Debt Instrument [Line Items]

Repayment of Debt

$ 111

8.4% due 2031 | Unsecured junior subordinated notes

Debt Instrument [Line Items]

Interest Rate

8.40%

Total principal

$ 10

10

5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member]

Debt Instrument [Line Items]

Total principal

$ 1,485

1,485

5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member] | Minimum

Debt Instrument [Line Items]

Interest Rate

5.25%

5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member] | Maximum

Debt Instrument [Line Items]

Interest Rate

5.75%

2.0%, due 2021 and 2024 | Remarketable subordinated notes

Debt Instrument [Line Items]

Interest Rate

2.00%

Total principal

1,400

4.82%, due 2042

Debt Instrument [Line Items]

Interest Rate

4.82%

Total principal

$ 345

[1]

362

2.98% to 7.20%, due 2024 to 2051 | Questar Gas | Minimum

Debt Instrument [Line Items]

Interest Rate

2.98%

2.98% to 7.20%, due 2024 to 2051 | Questar Gas | Maximum

Debt Instrument [Line Items]

Interest Rate

7.20%

Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 | Dominion Energy Questar Pipeline LLC | Minimum

Debt Instrument [Line Items]

Interest Rate

3.53%

Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 | Dominion Energy Questar Pipeline LLC | Maximum

Debt Instrument [Line Items]

Interest Rate

4.875%

Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes

Debt Instrument [Line Items]

Total principal

[2]

$ 7,688

7,488

Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes | Minimum

Debt Instrument [Line Items]

Interest Rate

1.60%

Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes | Maximum

Debt Instrument [Line Items]

Interest Rate

7.00%

PSNC, Senior Debentures and Notes, 4.13% to 7.45%, due 2020 to 2047 | PSNC [Member] | Minimum

Debt Instrument [Line Items]

Interest Rate

4.13%

PSNC, Senior Debentures and Notes, 4.13% to 7.45%, due 2020 to 2047 | PSNC [Member] | Maximum

Debt Instrument [Line Items]

Interest Rate

7.45%

First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | DESC | Minimum

Debt Instrument [Line Items]

Interest Rate

3.22%

First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | DESC | Maximum

Debt Instrument [Line Items]

Interest Rate

6.625%

3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing

Debt Instrument [Line Items]

Total principal

[3]

$ 54

3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing | Minimum

Debt Instrument [Line Items]

Interest Rate

3.625%

3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing | Maximum

Debt Instrument [Line Items]

Interest Rate

4.00%

Tax-Exempt Financing, 1.7% due 2033

Debt Instrument [Line Items]

Interest Rate

1.70%

Tax-Exempt Financing, 1.7% due 2033 | Tax Exempt Financing

Debt Instrument [Line Items]

Total principal

$ 27

27

1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing

Debt Instrument [Line Items]

Total principal

[4],[5]

$ 625

664

1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing | Minimum

Debt Instrument [Line Items]

Interest Rate

1.80%

1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing | Maximum

Debt Instrument [Line Items]

Interest Rate

5.00%

2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes

Debt Instrument [Line Items]

Total principal

$ 11,789

$ 11,090

2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes | Minimum

Debt Instrument [Line Items]

Interest Rate

2.75%

2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes | Maximum

Debt Instrument [Line Items]

Interest Rate

8.875%

2.5% to 4.8%, due 2019 to 2049 | Dominion Energy Gas Holdings, LLC | Senior Notes | Minimum

Debt Instrument [Line Items]

Interest Rate

2.50%

2.5% to 4.8%, due 2019 to 2049 | Dominion Energy Gas Holdings, LLC | Senior Notes | Maximum

Debt Instrument [Line Items]

Interest Rate

4.80%

2.579% to 4.104%, due 2019 to 2024 | Unsecured junior subordinated notes | Minimum

Debt Instrument [Line Items]

Interest Rate

2.579%

2.579% to 4.104%, due 2019 to 2024 | Unsecured junior subordinated notes | Maximum

Debt Instrument [Line Items]

Interest Rate

4.104%

4.125% to 6.25%, due 2020 to 2022 | Minimum

Debt Instrument [Line Items]

Interest Rate

4.125%

4.125% to 6.25%, due 2020 to 2022 | Maximum

Debt Instrument [Line Items]

Interest Rate

6.25%

Senior notes due in two zero two four | Senior Notes

Debt Instrument [Line Items]

Interest Rate

5.49%

Debt Instrument, Face Amount

$ 33

Industrial Revenue Bonds

Debt Instrument [Line Items]

Total principal

$ 68

Term Loan Due 2021

Debt Instrument [Line Items]

Repayment of Debt

$ 3,000

Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 | Virginia Electric and Power Company

Debt Instrument [Line Items]

Interest Rate

5.00%

Debt, amount redeemed

$ 40

Scenario, Forecast | September 2006 hybrids

Debt Instrument [Line Items]

Repayment of Debt

$ 286

Scenario, Forecast | June 2006 hybrids

Debt Instrument [Line Items]

Repayment of Debt

$ 111

Scenario, Forecast | DS C A N A

Debt Instrument [Line Items]

Debt Instrument, Maturity Date, Description

The notes would have otherwise matured in May 2021 and February 2022, respectively.

Scenario, Forecast | DS C A N A | Floating rate senior notes

Debt Instrument [Line Items]

Debt Instrument, Face Amount

$ 66

Debt Instrument, Maturity Date, Description

The notes would have otherwise matured in June 2034

Scenario, Forecast | DS C A N A | Four Point Seven Five Percent Medium Term Notes

Debt Instrument [Line Items]

Interest Rate

4.75%

Debt Instrument, Face Amount

$ 183

Scenario, Forecast | DS C A N A | Four Point One Two Five Percent Medium Term Notes

Debt Instrument [Line Items]

Interest Rate

4.125%

Debt Instrument, Face Amount

$ 155

[1]

Represents debt associated with Eagle Solar, SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s, SBL Holdco’s and Dominion Solar Projects III, Inc’s interest in certain solar facilities.

[2]

Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.

[3]

Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.

[4]

In May 2019, Virginia Power redeemed its $40 million 5.0% Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 at the principal outstanding plus accrued interest.

[5]

These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

Long-Term Debt (Based on Stated

Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
2020	$ 2,325
2021	2,572
2022	1,712
2023	2,630
2024	2,626
Thereafter	25,253
Total	$ 37,118
Weighted- average coupon, 2020	3.09%
Weighted- average coupon, 2021	3.15%
Weighted- average coupon, 2022	3.10%
Weighted- average coupon, 2023	2.95%
Weighted- average coupon, 2024	3.19%
Weighted- average coupon, Thereafter	4.62%
First mortgage bonds
Debt Instrument [Line Items]
2021	$ 33
Thereafter	3,234
Total	3,267
Unsecured senior notes
Debt Instrument [Line Items]
2020	1,275	[1],[2]
2021	1,237	[1],[2]
2022	1,659	[1],[2]
2023	2,355	[1],[2]
2024	1,745	[1],[2]
Thereafter	19,092	[1],[2]
Total	27,363	[1],[2]
Tax-exempt financings
Debt Instrument [Line Items]
Thereafter	774
Total	774
Term loans
Debt Instrument [Line Items]
2020	35	[3]
2021	35	[3]
2022	34	[3]
2023	259	[3]
2024	164	[3]
Total	527	[3]
Secured senior notes
Debt Instrument [Line Items]
2020	15
2021	17
2022	19
2023	16
2024	17
Thereafter	261
Total	345
Unsecured junior subordinated notes payable to affiliated trusts
Debt Instrument [Line Items]
Thereafter	10
Total	10
Unsecured junior subordinated notes
Debt Instrument [Line Items]
2020	1,000
2021	1,250
2022	0
2024	700
Total	2,950
Enhanced junior subordinated notes
Debt Instrument [Line Items]
Thereafter	1,882	[1]
Total	1,882	[1]
Dominion Energy Gas Holdings, LLC
Debt Instrument [Line Items]
2020	700
2021	500
2023	650
2024	1,050
Thereafter	2,661
Total	$ 5,561
Weighted- average coupon, 2020	2.80%
Weighted- average coupon, 2021	2.49%
Weighted- average coupon, 2023	3.29%
Weighted- average coupon, 2024	2.97%
Weighted- average coupon, Thereafter	3.95%
Virginia Electric and Power Company
Debt Instrument [Line Items]
2022	$ 750
2023	700
2024	350
Thereafter	10,614
Total	$ 12,414
Weighted- average coupon, 2022	3.15%
Weighted- average coupon, 2023	2.75%
Weighted- average coupon, 2024	3.45%
Weighted- average coupon, Thereafter	4.35%
Virginia Electric and Power Company | Unsecured senior notes
Debt Instrument [Line Items]
2022	$ 750
2023	700
2024	350
Thereafter	9,989
Total	11,789
Virginia Electric and Power Company | Tax-exempt financings
Debt Instrument [Line Items]
Thereafter	625
Total	$ 625
[1]	In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within current liabilities in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[2]	In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034.
[3]	Excludes mandatory prepayments associated with SBL Holdco and Dominion Solar Projects III, Inc. based on cash flows in excess of debt service. At December 31, 2019, $20 million of estimated mandatory prepayments due within one year were included in securities due within one year in Dominion Energy’s Consolidated Balance Sheets.

Long-Term Debt (Based on Stat_2

Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Parenthetical) (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Repayment of Debt		$ 9,116	$ 5,682	$ 1,572
Term loans
Debt Instrument [Line Items]
Estimated mandatory prepayments due within one year		$ 20
Dominion Energy Midstream Partners, LP
Debt Instrument [Line Items]
Repayment of outstanding credit facility balance	$ 73
Variable Rate Term Loan | Dominion Energy Midstream Partners, LP
Debt Instrument [Line Items]
Repayment of Debt	$ 300

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions

Oct. 01, 2024

Jun. 30, 2019

Feb. 29, 2020

Aug. 31, 2019

Jul. 31, 2017

Sep. 30, 2006

Jun. 30, 2006

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Jun. 14, 2019

May 31, 2017

Aug. 31, 2016

Jul. 31, 2016

Oct. 31, 2014

Jul. 31, 2014

Debt Instrument [Line Items]

Aggregate redemption price paid

$ 2,200

Aggregate outstanding principal of senior notes

2,200

Make-whole premium

$ 34

Period of deferral

10 years

Issuance of common stock (in shares)

18.5

6.1

Repayments of Long-term Debt

$ 9,116

$ 5,682

$ 1,572

Common Stock

Debt Instrument [Line Items]

Purchase Price Per Share Under Stock Purchase Contract

$ 50

Capital Unit, Class A

Debt Instrument [Line Items]

Payment percentage rate on Equity Units

6.75%

6.375%

Issuance of common stock (in shares)

12.5

2019 Series A Corporate Units

Debt Instrument [Line Items]

Principal amount of notes

$ 1,600

Shares to be issued under purchase contracts

21.8

2019 Series A Corporate Units | Common Stock

Debt Instrument [Line Items]

Purchase Price Per Share Under Stock Purchase Contract

$ 100

Senior Note Redemptions

Debt Instrument [Line Items]

Interest expense

$ 69

Senior Note Redemptions | Series A 4.45% Senior Notes Due 2021

Debt Instrument [Line Items]

Interest rate (percentage)

4.45%

Senior Note Redemptions | Series B 2.50% Senior Notes Due 2019

Debt Instrument [Line Items]

Interest rate (percentage)

2.50%

Senior Note Redemptions | Series C 3.625% Senior Notes Due 2024

Debt Instrument [Line Items]

Interest rate (percentage)

3.625%

July 2016 Hybrids | Unsecured junior subordinated notes

Debt Instrument [Line Items]

Interest rate (percentage)

5.25%

Principal amount of notes

$ 800

Remarketable Subordinated Notes | Capital Unit, Class A

Debt Instrument [Line Items]

Interest rate (percentage)

1.50%

Principal amount of notes

$ 700

$ 1,000

$ 1,400

$ 1,000

Issuance of common stock (in shares)

12.5

Remarketable Subordinated Notes | Capital Unit, Class B

Debt Instrument [Line Items]

Interest rate (percentage)

3.071%

Principal amount of notes

$ 700

Issuance of common stock (in shares)

18.5

Series A Junior Subordinated Notes | Capital Unit, Class B

Debt Instrument [Line Items]

Interest rate (percentage)

2.715%

Series A Junior Subordinated Notes | Unsecured junior subordinated notes

Debt Instrument [Line Items]

Interest rate (percentage)

2.579%

Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021

Debt Instrument [Line Items]

Interest rate (percentage)

2.00%

Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024

Debt Instrument [Line Items]

Interest rate (percentage)

2.00%

June 2006 hybrids

Debt Instrument [Line Items]

Aggregate redemption price paid

$ 12

Junior subordinated notes

$ 300

Principal amount of notes

$ 13

June 2006 hybrids | Scenario, Forecast

Debt Instrument [Line Items]

Repayments of Long-term Debt

$ 111

June 2006 hybrids | LIBOR

Debt Instrument [Line Items]

Spread on variable percentage rate

2.825%

September 2006 hybrids

Debt Instrument [Line Items]

Junior subordinated notes

$ 500

September 2006 hybrids | Scenario, Forecast

Debt Instrument [Line Items]

Repayments of Long-term Debt

$ 286

September 2006 hybrids | LIBOR

Debt Instrument [Line Items]

Spread on variable percentage rate

2.30%

October 2014 Hybrids | Unsecured junior subordinated notes

Debt Instrument [Line Items]

Interest rate (percentage)

5.75%

Principal amount of notes

$ 685

October 2014 Hybrids | July 2016 Hybrids | Scenario, Forecast

Debt Instrument [Line Items]

Spread on variable percentage rate

3.057%

Preferred Stock (Narrative) (De

Preferred Stock (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 15, 2024	Jun. 30, 2019	Jun. 14, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock shares authorized	20,000,000	20,000,000
Preferred Stock, Redemption Price Per Share	$ 1,020	$ 1,020
Series B preferred stock value issued	$ 2,387	$ 2,387				$ 0
Dividend stock		$ 17
Scenario, Forecast
Class of Stock [Line Items]
Preferred Stock, Redemption Price Per Share			$ 1,000
2019 Corporate Units
Class of Stock [Line Items]
Percentage Of Interest In Undivided Beneficial Ownership				10.00%
Total Long-term Debt					$ 1,600
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock shares authorized	800,000	800,000
Dividends Payable, Amount Per Share	$ 1.9375	$ 1.9375
Common Stock
Class of Stock [Line Items]
Purchase Price Per Share Under Stock Purchase Contract	$ 50	$ 50
Common Stock | 2019 Corporate Units
Class of Stock [Line Items]
Purchase Price Per Share Under Stock Purchase Contract					$ 100
Virginia Electric and Power Company
Class of Stock [Line Items]
Preferred stock shares authorized	10,000,000	10,000,000				10,000,000
Preferred stock shares issued	0	0				0
Preferred stock shares outstanding	0	0				0
Liquidation preference (in dollars per share)	$ 100	$ 100
Dominion Energy
Class of Stock [Line Items]
Dividend rate percentage	2.993%
Dividend stock		$ 2
Dominion Energy | Preferred Class A
Class of Stock [Line Items]
Preferred stock shares issued	2,400,000	2,400,000
Preferred stock shares outstanding	2,400,000	2,400,000
Dominion Energy | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock shares issued	1,600,000	1,600,000
Preferred stock shares outstanding	1,600,000	1,600,000
Dominion Energy | Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock shares issued	800,000	800,000
Preferred stock shares outstanding	800,000	800,000
Series B preferred stock value issued	$ 791	$ 791
Issuance of costs		9
Preferred stock liquidation value	$ 1,000	$ 1,000
Dividend rate percentage		4.65%
DESC
Class of Stock [Line Items]
Preferred stock shares authorized	20,000,000	20,000,000
SCANA
Class of Stock [Line Items]
Preferred Stock Held By SCANA	1,000	1,000

Preferred Stock (Schedule of Eq

Preferred Stock (Schedule of Equity Units) (Detail) - USD ($) shares in Millions, $ in Millions		Jun. 14, 2019	Dec. 31, 2019	Aug. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Capital Unit [Line Items]
Units Issued				18.5	6.1
Total Net Proceeds			$ 2,100
Total Preferred Stock			2,387		$ 2,387	$ 0
Stock Purchase Contract Liability			$ 212		$ 212
Preferred Stock
Capital Unit [Line Items]
Units Issued					2
Preferred Stock | 2019 Corporate Units
Capital Unit [Line Items]
Units Issued		16
Total Net Proceeds	[1]	$ 1,582
Total Preferred Stock	[2]	$ 1,610
Cumulative Dividend Rate		1.75%
Stock Purchase Contract Annual Rate		5.50%
Stock Purchase Contract Liability	[3]	$ 250
[1]	Issuance costs of $28 million were recorded as a reduction to preferred stock ($14 million) and common stock ($14 million) in the Consolidated Balance Sheets.
[2]	Dominion Energy recorded dividends of $15 million ($9.479 per share) for the year ended December 31, 2019.
[3]	Payments of $38 million were made in 2019. The stock purchase contract liability was $212 million at December 31, 2019.

Preferred Stock (Schedule of _2

Preferred Stock (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions	Jun. 14, 2019	Dec. 31, 2019
Capital Unit [Line Items]
Issuance costs	$ 28
Corporate units stock purchase contract liability payments		$ 38
Stock Purchase Contract Liability		212
Preferred Stock
Capital Unit [Line Items]
Issuance costs	14
Recorded dividend		$ 15
Dividends per share		$ 9.479
Common Stock [Member]
Capital Unit [Line Items]
Issuance costs	$ 14

Equity (Narrative) (Detail)

Equity (Narrative) (Detail) - USD ($) $ in Millions	Jun. 14, 2019	Dec. 31, 2019	Oct. 31, 2019	Aug. 31, 2019	Jan. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018	Jun. 30, 2017	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock				$ 1,400											$ 2,515	$ 2,461	$ 1,302
Issuance of common stock (in shares)				18,500,000											6,100,000
Fees and commissions paid	$ 28
Shares of common stock issued in acquisition, value					$ 1,600										$ 6,818
Number of shares received							27,000,000
Increase (decrease) Non-controlling interest							$ 375
Compensation cost related to stock-based compensation															46	48	45
Tax benefit from stock awards and stock options exercised															$ 11	12	16
Vesting period															3 years
Defined Benefit Pension plans															$ 499
Cash consideration from sale of noncontrolling interest		$ 2,100
SCANA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued in acquisition					95,600,000										95,600,000
Shares of common stock issued in acquisition, value					$ 6,800										$ 6,800
Cash Based Performance Grant | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-based performance grants maximum percentage															200.00%
February 2017 Cash Based Performance Grant [Member] | Officer | Two-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		13										$ 13			$ 13
February 2017 Cash Based Performance Grant [Member] | Officer | Three-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		13										13			13
Liability accrued for award		13										13			13
February 2018 Cash Based Performance Grant [Member] | Officer | Three-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		15				$ 16						15		$ 16	15	16
Liability accrued for award		$ 8				$ 5						$ 8		5	$ 8	5
Cove Point
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership interest percentage of limited partner interests			25.00%			25.00%
Cash consideration from sale of noncontrolling interest			$ 2,100
Stock Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were available for future grants		21,000,000										21,000,000			21,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested awards		$ 59										$ 59			$ 59
Fair value of restricted stock awards that vested															23	23	21
Dominion Midstream Partners, LP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued in acquisition					22,500,000
Converted right to receive shares					0.2492
Income taxes in equity primarily regulatory liabilities related to excess		$ 40										40			40
Dominion Energy Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock															$ 309
Issuance of common stock (in shares)															4,000,000
Maximum | Stock Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock based awards															8 years
Weighted Average | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average period recognized for the unrecognized compensation cost															2 years 1 month 6 days
Goldman Sachs & Co. and Credit Suisse LLC.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock						$ 1.4
Issuance of common stock (in shares)						22,100,000
Number of shares for future agreement								20,000,000
Option exercised								2,100,000
Capital Unit, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock																	$ 1,000
Issuance of common stock (in shares)																	12,500,000
Various Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock															$ 11,000	$ 2,500	$ 1.3
Issuance of common stock (in shares)															157,000,000	36,000,000	17,000,000
Shelf Registration for Sale of Common Stock through At-the-market Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock										$ 495		$ 639	$ 154	$ 197
Issuance of common stock (in shares)										6,600,000		7,800,000	2,100,000	2,700,000
Fees and commissions paid										$ 5		$ 6	$ 2	$ 2
Shelf Registration for Sale of Common Stock through At-the-market Program | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock authorized amount									$ 1,000		$ 500

Equity (Accumulated Other Compr

Equity (Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 01, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI, including noncontrolling interest	$ (1,793)		$ (1,699)
Less other comprehensive income (loss) attributable to noncontrolling interest	0		1
Total AOCI	(1,793)		(1,700)
Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(407)		(234)
Amount of tax		$ 135	79
Unrealized Gains and Losses on Investment Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	37		2
Amount of tax	(13)
Unrecognized Pension and Other Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(1,421)		(1,465)
Amount of tax	492		519
Other Comprehensive Loss From Equity Method Investee
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(2)		(2)
Amount of tax	1
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(29)		(12)
Virginia Electric and Power Company | Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(34)		(13)
Amount of tax		$ 11	4
Virginia Electric and Power Company | Unrealized Gains and Losses on Investment Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	5		1
Amount of tax	(1)		0
Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI, including noncontrolling interest	(188)		(169)
Less other comprehensive income (loss) attributable to noncontrolling interest	(1)
Total AOCI	(187)		(169)
Dominion Energy Gas Holdings, LLC | Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(82)		(25)
Amount of tax	28		8
Dominion Energy Gas Holdings, LLC | Unrecognized Pension and Other Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total AOCI	(106)		(144)
Amount of tax	$ 41		$ 56

Equity (Schedule of Changes in

Equity (Schedule of Changes in AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 20,107
Ending balance	31,994	$ 20,107
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	13,047	12,224	$ 11,865
Ending balance	13,989	13,047	12,224
Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(235)	(302)
Other comprehensive income before reclassifications: gains (losses)	(110)	30
Amounts reclassified from AOCI: (gains) losses	(62)	102
Net current period other comprehensive income (loss)	(172)	132
Cumulative-effect of changes in accounting principle		(64)
Less other comprehensive income (loss) attributable to noncontrolling interest		1
Ending balance	(407)	(235)	(302)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13)	(12)
Other comprehensive income before reclassifications: gains (losses)	(22)	1
Amounts reclassified from AOCI: (gains) losses	1	1
Net current period other comprehensive income (loss)	(21)	2
Cumulative-effect of changes in accounting principle		(3)
Ending balance	(34)	(13)	(12)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(25)	(23)
Other comprehensive income before reclassifications: gains (losses)	(61)	(16)
Amounts reclassified from AOCI: (gains) losses	5	19
Net current period other comprehensive income (loss)	(56)	3
Cumulative-effect of changes in accounting principle	1	(5)
Less other comprehensive income (loss) attributable to noncontrolling interest	(1)
Ending balance	(81)	(25)	(23)
Unrealized Gains and Losses on Investment Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2	747
Other comprehensive income before reclassifications: gains (losses)	39		(18)
Amounts reclassified from AOCI: (gains) losses	(4)		5
Net current period other comprehensive income (loss)	35		(13)
Cumulative-effect of changes in accounting principle		(732)
Ending balance	37	2	747
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1	74
Other comprehensive income before reclassifications: gains (losses)	5	0
Amounts reclassified from AOCI: (gains) losses	(1)	0
Net current period other comprehensive income (loss)	4	0
Cumulative-effect of changes in accounting principle		(73)
Ending balance	5	1	74
Unrealized Gains and Losses on Investment Securities | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative-effect of changes in accounting principle		(21)
Unrecognized Pension and Other Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,465)	(1,101)
Other comprehensive income before reclassifications: gains (losses)	(22)	(215)
Amounts reclassified from AOCI: (gains) losses	66	78
Net current period other comprehensive income (loss)	44	(137)
Cumulative-effect of changes in accounting principle		(227)
Ending balance	(1,421)	(1,465)	(1,101)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(144)	(75)
Other comprehensive income before reclassifications: gains (losses)	33	(52)
Amounts reclassified from AOCI: (gains) losses	5	4
Net current period other comprehensive income (loss)	38	(48)
Cumulative-effect of changes in accounting principle	0
Less other comprehensive income (loss) attributable to noncontrolling interest	0
Ending balance	(106)	(144)	(75)
Other Comprehensive Loss From Equity Method Investee
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2)	(3)
Other comprehensive income before reclassifications: gains (losses)	0	1
Amounts reclassified from AOCI: (gains) losses	0
Net current period other comprehensive income (loss)	0	1
Ending balance	(2)	(2)	(3)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,700)	(659)
Other comprehensive income before reclassifications: gains (losses)	(93)	(202)
Amounts reclassified from AOCI: (gains) losses	0	185
Net current period other comprehensive income (loss)	(93)	(17)
Cumulative-effect of changes in accounting principle		(1,023)
Less other comprehensive income (loss) attributable to noncontrolling interest		1
Ending balance	(1,793)	(1,700)	(659)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(12)	62	46
Other comprehensive income before reclassifications: gains (losses)	(17)	1
Amounts reclassified from AOCI: (gains) losses	0	1
Net current period other comprehensive income (loss)	(17)	2
Cumulative-effect of changes in accounting principle		(76)
Ending balance	(29)	(12)	62
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(169)	(98)
Other comprehensive income before reclassifications: gains (losses)	(28)	(68)
Amounts reclassified from AOCI: (gains) losses	10	23
Net current period other comprehensive income (loss)	(18)	(45)
Cumulative-effect of changes in accounting principle	1	(26)
Less other comprehensive income (loss) attributable to noncontrolling interest	(1)
Ending balance	$ (187)	$ (169)	$ (98)

Equity (Schedule of Reclassific

Equity (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Electric fuel and other energy related purchases		$ (2,938)	$ (2,814)	$ (2,301)
Interest and related charges		(1,773)	(1,493)	(1,205)
Other income	[1]	986	1,021	358
Income from operations before income tax expense		1,727	3,129	3,090
Income tax expense		351	580	(30)
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Electric fuel and other energy related purchases	[2]	(2,178)	(2,318)	(1,909)
Interest and related charges	[2]	(524)	(511)	(494)
Other income		98	22	76
Income from operations before income tax expense		1,413	1,582	2,314
Income tax expense		264	300	774
Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges	[3]	(311)	(174)	(60)
Other income		166	89	62
Income from operations before income tax expense		802	756	601
Income tax expense		101	124	(65)
Income from continuing operations including noncontrolling interests		701	632	$ 666
Deferred (gains) and losses on derivatives-hedging activities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from operations before income tax expense		(83)	137
Income tax expense		21	(35)
Income from continuing operations including noncontrolling interests		(62)	102
Deferred (gains) and losses on derivatives-hedging activities | Commodity contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue		(146)	90
Electric fuel and other energy related purchases		3	(14)
Deferred (gains) and losses on derivatives-hedging activities | Interest rate contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges		54	48
Deferred (gains) and losses on derivatives-hedging activities | Foreign currency contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		6	13
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from operations before income tax expense		1	1
Income from continuing operations including noncontrolling interests		1	1
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Interest rate contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges		1	1
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from operations before income tax expense		7	26
Income tax expense		(2)	(7)
Income from continuing operations including noncontrolling interests		5	19
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Commodity contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue		(4)	8
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Interest rate contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges		5	5
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Foreign currency contracts | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		6	13
Unrealized (gains) and losses on investment securities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gain) loss on sale of securities		(5)	7
Income from operations before income tax expense		(5)	7
Income tax expense		1	(2)
Income from continuing operations including noncontrolling interests		(4)	5
Unrealized (gains) and losses on investment securities | Virginia Electric and Power Company | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gain) loss on sale of securities		2
Impairment		0
Income from operations before income tax expense		(2)
Income tax expense		1
Income from continuing operations including noncontrolling interests		1
Amortization of prior-service costs (credits) | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		7	6
Unrecognized pension and other postretirement benefit costs, net of tax		5	4
Unrecognized pension and other postretirement benefit costs | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		(24)	21
Other income			120
Unrecognized pension and other postretirement benefit costs, before tax		89	99
Unrecognized pension and other postretirement benefit costs, income tax expense		(23)	(21)
Unrecognized pension and other postretirement benefit costs, net of tax			78
Unrecognized pension and other postretirement benefit costs | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		113
Unrecognized pension and other postretirement benefit costs, before tax		7	6
Unrecognized pension and other postretirement benefit costs, income tax expense		(2)	$ (2)
Unrecognized pension and other postretirement benefit costs, net of tax		$ 66
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to affiliates.
[3]	See Note 25 for amounts attributable to related parties.

Equity (Summary of Restricted S

Equity (Summary of Restricted Stock and Goal-Based Stock Activity) (Detail) - Restricted Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested beginning (in shares)	1,208	1,043	886
Granted (in shares)	614	534	454
Vested (in shares)	(324)	(316)	(287)
Cancelled and forfeited (in shares)	(96)	(53)	(10)
Nonvested ending (in shares)	1,402	1,208	1,043
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested beginning, Weighted Average Grant Date Fair Value (in dollars per share)	$ 73.03	$ 73.32	$ 71.40
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	76.49	72.92	74.24
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	71.75	73.59	68.90
Cancelled and forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	77.16	74.25	72.37
Nonvested ending, Weighted Average Grant Date Fair Value (in dollars per share)	$ 74.77	$ 73.03	$ 73.32

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Detail) - USD ($) shares in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation		$ 9,700,000,000			$ 9,700,000,000	$ 7,800,000,000
Contributions to qualified defined benefit pension plans					499,000,000
Contributions to qualified defined benefit pension plans, shares		6.1
Contributions to qualified defined benefit pension plans in 2020		$ 29,000,000			29,000,000
Contribution to voluntary employees beneficiary association					12,000,000
Defined contribution plan, employer matching contributions					$ 73,000,000	51,000,000	$ 45,000,000
Common Stock
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to qualified defined benefit pension plans		$ 499,000,000
Common and Preferred Stocks
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, actual plan asset allocation percentages		28.00%			28.00%
Non-U.S.Equity
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, actual plan asset allocation percentages		18.00%			18.00%
Fixed Income
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, actual plan asset allocation percentages		35.00%			35.00%
Real Estate Funds
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, actual plan asset allocation percentages		3.00%			3.00%
Other Alternative Investments
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, actual plan asset allocation percentages		16.00%			16.00%
Scenario, Forecast
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension or other postretirement plan assets to be returned								$ 0
Pension Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					$ 1,747,000,000	(513,000,000)
Expected return on pension and other postretirement plan assets					708,000,000	663,000,000	639,000,000
Net periodic benefit cost (credit)					$ 93,000,000	$ 25,000,000	7,000,000
Increase in fair value of plan assets			$ 51,000,000	$ 671,000,000
Discount rate percentage		3.63%			3.63%	4.42%
Contributions to qualified defined benefit pension plans		$ 520,000,000			$ 557,000,000	$ 6,000,000
Pension Benefits | Minimum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate percentage		3.47%		4.07%	3.47%	4.42%
Pension Benefits | Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate percentage		3.63%		4.10%	3.63%	4.43%
Other Postretirement Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					$ 349,000,000	$ (92,000,000)
Expected return on pension and other postretirement plan assets					140,000,000	143,000,000	128,000,000
Net periodic benefit cost (credit)					$ (46,000,000)	$ (101,000,000)	(80,000,000)
Increase in fair value of plan assets				$ 156,000,000
Discount rate percentage		3.44%			3.44%	4.37%
Contributions to qualified defined benefit pension plans					$ 12,000,000	$ 12,000,000
Other Postretirement Benefits | Minimum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate percentage		3.44%		4.05%	3.44%	4.37%
Other Postretirement Benefits | Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate percentage		3.52%		4.08%	3.52%	4.38%
Voluntary Retirement Program
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				$ 427,000,000
Voluntary retirement program related charges net of tax				319,000,000
Remeasurement resulted in increase in pension benefit obligation			$ 37,000,000	484,000,000
Increase in accumulated postretirement benefit obligation				101,000,000
Discount rate percentage			3.57%
Voluntary Retirement Program | Other operations and maintenance
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				291,000,000
Voluntary Retirement Program | Other Taxes
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				24,000,000
Voluntary Retirement Program | Other Income
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				112,000,000
Pension Plans and Post Retirement Benefit Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					$ 2,100,000	$ (605,000,000)
Expected return on pension and other postretirement plan assets					848,000,000	806,000,000
Voluntary Employees Beneficiary Association
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to qualified defined benefit pension plans in 2020		$ 12,000,000			12,000,000
Dominion Energy Gas Holdings, LLC
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation		279,000,000			279,000,000	689,000,000
Contributions to qualified defined benefit pension plans		0
Contributions to qualified defined benefit pension plans in 2020		$ 0			0
Defined contribution plan, employer matching contributions					4,000,000	8,000,000	8,000,000
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					(4,000,000)	(8,000,000)	(6,000,000)
Dominion Energy Gas Holdings, LLC | Net income from discontinued operations | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					(1,000,000)	(2,000,000)	(2,000,000)
Dominion Energy Gas Holdings, LLC | Pension Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					129,000,000	(113,000,000)
Expected return on pension and other postretirement plan assets					54,000,000	150,000,000	141,000,000
Net periodic benefit cost (credit)					(29,000,000)	(84,000,000)	(80,000,000)
Increase in fair value of plan assets				$ 146,000,000
Discount rate percentage				4.10%
Contributions to qualified defined benefit pension plans					0
Dominion Energy Gas Holdings, LLC | Pension Benefits | Other operations and maintenance
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					(8,000,000)	(35,000,000)	(35,000,000)
Dominion Energy Gas Holdings, LLC | Pension Benefits | Net income from discontinued operations
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					(14,000,000)	(21,000,000)	(20,000,000)
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					38,000,000	(16,000,000)
Expected return on pension and other postretirement plan assets					16,000,000	28,000,000	24,000,000
Net periodic benefit cost (credit)					(11,000,000)	(14,000,000)	(9,000,000)
Increase in fair value of plan assets				$ 29,000,000
Discount rate percentage				4.05%
Contributions to qualified defined benefit pension plans					12,000,000	12,000,000
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				$ 74,000,000
Voluntary retirement program related charges net of tax				58,000,000
Remeasurement resulted in increase in pension benefit obligation				32,000,000
Increase in accumulated postretirement benefit obligation				8,000,000
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other operations and maintenance
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				39,000,000
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other Taxes
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				2,000,000
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other Income
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				1,000,000
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Net income loss from discontinued operations
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				32,000,000
Dominion Energy Gas Holdings, LLC | Pension Plans and Post Retirement Benefit Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual return (loss) on pension and other postretirement plan assets					167,000,000	(129,000,000)
Expected return on pension and other postretirement plan assets					70,000,000	178,000,000
Virginia Electric and Power Company
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contributions					20,000,000	20,000,000	19,000,000
Virginia Electric and Power Company | Other operations and maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					(27,000,000)	(51,000,000)	(42,000,000)
Virginia Electric and Power Company | Pension Benefits | Other operations and maintenance
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)					152,000,000	$ 126,000,000	$ 110,000,000
Virginia Electric and Power Company | Other Postretirement Benefits
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to voluntary employees beneficiary association					$ 0
Virginia Electric and Power Company | Other Postretirement Benefits | Scenario, Forecast
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to voluntary employees beneficiary association	$ 0
Virginia Electric and Power Company | Voluntary Retirement Program
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				198,000,000
Voluntary retirement program related charges net of tax				146,000,000
Virginia Electric and Power Company | Voluntary Retirement Program | Other operations and maintenance
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				190,000,000
Virginia Electric and Power Company | Voluntary Retirement Program | Other Taxes
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary retirement program related charges				$ 8,000,000

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($)		1 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019
Changes in fair value of plan assets:
Employer contributions			$ 499,000,000
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets		$ 1,708,000,000	1,708,000,000	$ 1,279,000,000
Dominion Energy Gas Holdings, LLC
Changes in fair value of plan assets:
Employer contributions		0
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets	[1]	840,000,000	840,000,000	705,000,000
Noncurrent Assets of Discontinued Operations				5,849,000,000
Noncurrent liabilities of discontinued operations				(2,896,000,000)
Pension Benefits
Changes in benefit obligation:
Benefit obligation at beginning of year			8,500,000,000	9,052,000,000
Service cost			162,000,000	157,000,000	$ 138,000,000
Interest cost			394,000,000	337,000,000	345,000,000
Benefits paid			(470,000,000)	(358,000,000)
Actuarial (gains) losses during the year			1,054,000,000	(688,000,000)
Settlements and curtailments	[2]		(48,000,000)
Benefit obligation at end of year		10,446,000,000	10,446,000,000	8,500,000,000	9,052,000,000
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year			7,197,000,000	8,062,000,000
Dominion Energy SCANA Combination			727,000,000
Actual return (loss) on plan assets			1,747,000,000	(513,000,000)
Employer contributions		520,000,000	557,000,000	6,000,000
Benefits paid			(470,000,000)	(358,000,000)
Settlements			(127,000,000)
Fair value of plan assets at end of year		9,631,000,000	9,631,000,000	7,197,000,000	8,062,000,000
Funded status at end of year		(815,000,000)	(815,000,000)	(1,303,000,000)
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets		1,266,000,000	1,266,000,000	1,003,000,000
Other current liabilities		(29,000,000)	(29,000,000)	(34,000,000)
Noncurrent pension and other postretirement benefit liabilities		(2,052,000,000)	(2,052,000,000)	(2,272,000,000)
Net amount recognized		$ (815,000,000)	$ (815,000,000)	$ (1,303,000,000)
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.63%	3.63%	4.42%
Weighted average rate of increase for compensation		4.23%	4.23%	4.32%
Pension Benefits | SCANA
Changes in benefit obligation:
Dominion Energy SCANA Combination			$ 854,000,000
Pension Benefits | Dominion Energy Gas Holdings, LLC
Changes in benefit obligation:
Benefit obligation at beginning of year			730,000,000	$ 773,000,000
Dominion Energy Gas Restructuring			(468,000,000)
Service cost			6,000,000	18,000,000	15,000,000
Interest cost			11,000,000	29,000,000	30,000,000
Benefits paid			(15,000,000)	(34,000,000)
Actuarial (gains) losses during the year			30,000,000	(56,000,000)
Settlements and curtailments	[2]		1,000,000
Benefit obligation at end of year		$ 295,000,000	295,000,000	730,000,000	773,000,000
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year			1,656,000,000	1,803,000,000
Dominion Energy Gas Restructuring			(1,084,000,000)
Actual return (loss) on plan assets			129,000,000	(113,000,000)
Employer contributions			0
Benefits paid			(15,000,000)	(34,000,000)
Fair value of plan assets at end of year		686,000,000	686,000,000	1,656,000,000	1,803,000,000
Funded status at end of year		391,000,000	391,000,000	926,000,000
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets		391,000,000	391,000,000	310,000,000
Noncurrent Assets of Discontinued Operations				616,000,000
Net amount recognized		$ 391,000,000	$ 391,000,000	$ 926,000,000
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate						4.10%
Weighted average rate of increase for compensation		4.64%	4.64%	4.55%
Pension Benefits | Minimum
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.47%	3.47%	4.42%		4.07%
Pension Benefits | Maximum
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.63%	3.63%	4.43%		4.10%
Other Postretirement Benefits
Changes in benefit obligation:
Benefit obligation at beginning of year			$ 1,363,000,000	$ 1,529,000,000
Service cost			26,000,000	27,000,000	26,000,000
Interest cost			68,000,000	56,000,000	60,000,000
Benefits paid			(96,000,000)	(87,000,000)
Actuarial (gains) losses during the year			111,000,000	(158,000,000)
Plan amendments				(4,000,000)
Settlements and curtailments	[2]		44,000,000
Benefit obligation at end of year		$ 1,769,000,000	1,769,000,000	1,363,000,000	1,529,000,000
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year			1,581,000,000	1,729,000,000
Actual return (loss) on plan assets			349,000,000	(92,000,000)
Employer contributions			12,000,000	12,000,000
Benefits paid			(62,000,000)	(68,000,000)
Fair value of plan assets at end of year		1,880,000,000	1,880,000,000	1,581,000,000	1,729,000,000
Funded status at end of year		111,000,000	111,000,000	218,000,000
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets		442,000,000	442,000,000	276,000,000
Other current liabilities		(17,000,000)	(17,000,000)	(2,000,000)
Noncurrent pension and other postretirement benefit liabilities		(314,000,000)	(314,000,000)	(56,000,000)
Net amount recognized		$ 111,000,000	$ 111,000,000	$ 218,000,000
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.44%	3.44%	4.37%
Other Postretirement Benefits | SCANA
Changes in benefit obligation:
Dominion Energy SCANA Combination			$ 253,000,000
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Changes in benefit obligation:
Benefit obligation at beginning of year			256,000,000	$ 290,000,000
Dominion Energy Gas Restructuring			(135,000,000)
Service cost			1,000,000	4,000,000	4,000,000
Interest cost			5,000,000	11,000,000	12,000,000
Benefits paid			(8,000,000)	(18,000,000)
Actuarial (gains) losses during the year			1,000,000	(27,000,000)
Plan amendments				(4,000,000)
Settlements and curtailments	[2]		1,000,000
Benefit obligation at end of year		$ 121,000,000	121,000,000	256,000,000	290,000,000
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year			311,000,000	333,000,000
Dominion Energy Gas Restructuring			(126,000,000)
Actual return (loss) on plan assets			38,000,000	(16,000,000)
Employer contributions			12,000,000	12,000,000
Benefits paid			(8,000,000)	(18,000,000)
Fair value of plan assets at end of year		227,000,000	227,000,000	311,000,000	$ 333,000,000
Funded status at end of year		106,000,000	106,000,000	55,000,000
Amounts recognized in the Consolidated Balance Sheets at December 31:
Noncurrent pension and other postretirement benefit assets		106,000,000	106,000,000	63,000,000
Noncurrent liabilities of discontinued operations				(8,000,000)
Net amount recognized		$ 106,000,000	$ 106,000,000	$ 55,000,000
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate						4.05%
Other Postretirement Benefits | Minimum
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.44%	3.44%	4.37%		4.05%
Other Postretirement Benefits | Maximum
Significant assumptions used to determine benefit obligations as of December 31:
Discount rate		3.52%	3.52%	4.38%		4.08%
[1]	See Note 25 for amounts attributable to related parties.
[2]	2019 amounts relate primarily to a settlement as a result of the voluntary retirement program.

Employee Benefit Plans (Benefit

Employee Benefit Plans (Benefit Obligation in Excess of Plan Assets) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 9,552	$ 7,705
Fair value of plan assets	7,471	5,398
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	341	164
Fair value of plan assets	$ 10	136
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		134
Fair value of plan assets		$ 126

Employee Benefit Plans (Accumul

Employee Benefit Plans (Accumulated Benefit Obligation in Excess of Plan Assets) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Accumulated benefit obligation	$ 8,852	$ 7,056
Fair value of plan assets	$ 7,471	$ 5,398

Employee Benefit Plans (Benef_2

Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	$ 535
2021	472
2022	511
2023	519
2024	536
2025-2029	2,792
Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
2020	15
2021	15
2022	15
2023	15
2024	15
2025-2029	79
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	120
2021	117
2022	116
2023	114
2024	113
2025-2029	528
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
2020	8
2021	8
2022	8
2023	8
2024	8
2025-2029	$ 36

Employee Benefit Plans (Fair va

Employee Benefit Plans (Fair values of pension and post retirement plan assets by asset category) (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total investments		$ 1,708	$ 1,279
Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total investments	[1]	840	705
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		9,631	7,197	$ 8,062
Total investments		1,266	1,003
Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		686	1,656	1,803
Total investments		391	310
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,880	1,581	1,729
Total investments		442	276
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		227	311	$ 333
Total investments		106	63
Collective Bargaining Agreement | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		6,248	4,424
Total recorded at NAV	[2]	3,406	2,762
Total investments	[3]	9,654	7,186
Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		450	1,017
Total recorded at NAV	[2]	238	636
Total investments	[4]	688	1,653
Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		23	18
Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1	4
Collective Bargaining Agreement | Pension Benefits | US Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value	[5]	2,284	1,645
Collective Bargaining Agreement | Pension Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		177	378
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,634	1,061
Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		114	244
Collective Bargaining Agreement | Pension Benefits | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		360	318
Collective Bargaining Agreement | Pension Benefits | Insurance contracts | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		28	73
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,132	752
Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		69	173
Collective Bargaining Agreement | Pension Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		815	630
Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		61	145
Collective Bargaining Agreement | Pension Benefits | Common/collective trust funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	2,355	1,849
Collective Bargaining Agreement | Pension Benefits | Common/collective trust funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	157	425
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	91	108
Collective Bargaining Agreement | Pension Benefits | Real Estate Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	7	25
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	787	633
Collective Bargaining Agreement | Pension Benefits | Private Equity Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	61	146
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	159	155
Collective Bargaining Agreement | Pension Benefits | Fixed Income Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	12	36
Collective Bargaining Agreement | Pension Benefits | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	14	17
Collective Bargaining Agreement | Pension Benefits | Hedge Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	1	4
Collective Bargaining Agreement | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,045	829
Total recorded at NAV	[2]	836	751
Total investments	[6]	1,881	1,580
Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		107	143
Total recorded at NAV	[2]	120	168
Total investments		227	311
Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		2	2
Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		719	554
Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		86	113
Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		206	170
Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		21	30
Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		21	19
Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		51	45
Collective Bargaining Agreement | Other Postretirement Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		46	39
Collective Bargaining Agreement | Other Postretirement Benefits | Common/collective trust funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	717	650
Collective Bargaining Agreement | Other Postretirement Benefits | Common/collective trust funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	105	148
Collective Bargaining Agreement | Other Postretirement Benefits | Real Estate Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	8	10
Collective Bargaining Agreement | Other Postretirement Benefits | Real Estate Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	1	2
Collective Bargaining Agreement | Other Postretirement Benefits | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	100	80
Collective Bargaining Agreement | Other Postretirement Benefits | Private Equity Funds | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	14	18
Collective Bargaining Agreement | Other Postretirement Benefits | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	10	10
Collective Bargaining Agreement | Other Postretirement Benefits | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total recorded at NAV	[2]	1	1
Level 1 | Collective Bargaining Agreement | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		4,271	2,771
Level 1 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		297	637
Level 1 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		22	17
Level 1 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1	4
Level 1 | Collective Bargaining Agreement | Pension Benefits | US Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value	[5]	2,284	1,645
Level 1 | Collective Bargaining Agreement | Pension Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		177	378
Level 1 | Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,634	1,061
Level 1 | Collective Bargaining Agreement | Pension Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		114	244
Level 1 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		273	23
Level 1 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		3	5
Level 1 | Collective Bargaining Agreement | Pension Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		58	25
Level 1 | Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		2	6
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		930	728
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		107	143
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		2	1
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		719	554
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | US Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		86	113
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		206	170
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Foreign Equity Securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		21	30
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1	1
Level 1 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		2	2
Level 2 | Collective Bargaining Agreement | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1,977	1,653
Level 2 | Collective Bargaining Agreement | Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		153	380
Level 2 | Collective Bargaining Agreement | Pension Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		1	1
Level 2 | Collective Bargaining Agreement | Pension Benefits | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		360	318
Level 2 | Collective Bargaining Agreement | Pension Benefits | Insurance contracts | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		28	73
Level 2 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		859	729
Level 2 | Collective Bargaining Agreement | Pension Benefits | Corporate debt instruments | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		66	168
Level 2 | Collective Bargaining Agreement | Pension Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		757	605
Level 2 | Collective Bargaining Agreement | Pension Benefits | Government securities | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		59	139
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		115	101
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value			1
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		21	19
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		50	44
Level 2 | Collective Bargaining Agreement | Other Postretirement Benefits | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total recorded at fair value		$ 44	$ 37
[1]	See Note 25 for amounts attributable to related parties.
[2]	These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
[3]	Excludes net assets related to pending sales of securities of $52 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $99 million at December 31, 2019. Excludes net assets related to pending sales of securities of $12 million, net accrued income of $21 million, and includes net assets related to pending purchases of securities of $22 million at December 31, 2018.
[4]	Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $6 million at December 31, 2019. Excludes net assets related to pending sales of securities of $3 million, net accrued income of $5 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2018.
[5]	Includes $508 million of Dominion Energy common stock at December 31, 2019.
[6]	Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2019. Excludes net assets related to pending sales of securities of $1 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2018.

Employee Benefit Plans (Fair _2

Employee Benefit Plans (Fair values of pension and post retirement plan assets by asset category) (Parenthetical) (Detail) - Collective Bargaining Agreement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Common stock	$ 508
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pending sales of securities	52	$ 12
Net accrued income	24	21
Pending purchases of securities	99	22
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pending sales of securities	2	3
Net accrued income	2	5
Pending purchases of securities	6	5
Dominion Energy Gas Holdings, LLC | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pending sales of securities	2	1
Net accrued income	2	2
Pending purchases of securities	$ 5	$ 2

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit (Credit) Cost and Amounts Recognized in Other Comprehensive Income and Regulatory Assets and Liabilities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Service cost		$ 162	$ 157	$ 138
Interest cost		394	337	345
Expected return on plan assets		(708)	(663)	(639)
Amortization of prior service (credit) cost		1	1	1
Amortization of net actuarial loss		172	193	162
Settlements and curtailments		72	0	0
Net periodic benefit (credit) cost		93	25	7
Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities:
Current year net actuarial (gain) loss		16	490	142
Prior service (credit) cost		0	0	5
Settlements and curtailments		6	0	1
Amortization of net actuarial loss		(172)	(193)	(162)
Amortization of prior service credit (cost)		(1)	(1)	(1)
Total recognized in other comprehensive income and regulatory assets and liabilities		$ (151)	$ 296	$ (15)
Significant assumptions used to determine periodic cost:
Expected long-term rate of return on plan assets			8.75%	8.75%
Weighted average rate of increase for compensation		4.20%	4.09%	4.09%
Pension Benefits | Dominion Energy Gas Holdings, LLC
Service cost		$ 6	$ 18	$ 15
Interest cost		11	29	30
Expected return on plan assets		(54)	(150)	(141)
Amortization of prior service (credit) cost		0	0	0
Amortization of net actuarial loss		7	19	16
Settlements and curtailments		1
Net periodic benefit (credit) cost		(29)	(84)	(80)
Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities:
Current year net actuarial (gain) loss		(46)	207	(75)
Prior service (credit) cost		0	0	0
Amortization of net actuarial loss		(7)	(19)	(16)
Amortization of prior service credit (cost)		0	0	0
Total recognized in other comprehensive income and regulatory assets and liabilities		$ (53)	$ 188	$ (91)
Significant assumptions used to determine periodic cost:
Discount rate			3.81%	4.50%
Expected long-term rate of return on plan assets		8.65%	8.75%	8.75%
Weighted average rate of increase for compensation		4.55%	4.11%	4.11%
Pension Benefits | Minimum
Significant assumptions used to determine periodic cost:
Discount rate		3.57%	3.80%	3.31%
Expected long-term rate of return on plan assets		7.00%
Pension Benefits | Minimum | Dominion Energy Gas Holdings, LLC
Significant assumptions used to determine periodic cost:
Discount rate		4.10%
Pension Benefits | Maximum
Significant assumptions used to determine periodic cost:
Discount rate		4.43%	3.81%	4.50%
Expected long-term rate of return on plan assets		8.65%
Pension Benefits | Maximum | Dominion Energy Gas Holdings, LLC
Significant assumptions used to determine periodic cost:
Discount rate		4.42%
Other Postretirement Benefits
Service cost		$ 26	$ 27	$ 26
Interest cost		68	56	60
Expected return on plan assets		(140)	(143)	(128)
Amortization of prior service (credit) cost		(52)	(52)	(51)
Amortization of net actuarial loss		10	11	13
Settlements and curtailments		42	0	0
Net periodic benefit (credit) cost		(46)	(101)	(80)
Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities:
Current year net actuarial (gain) loss		(98)	78	12
Prior service (credit) cost		2	(4)	(73)
Settlements and curtailments		0	0	2
Amortization of net actuarial loss		(10)	(11)	(13)
Amortization of prior service credit (cost)		52	52	51
Total recognized in other comprehensive income and regulatory assets and liabilities		$ (54)	$ 115	$ (21)
Significant assumptions used to determine periodic cost:
Discount rate			3.76%
Expected long-term rate of return on plan assets		8.50%	8.50%	8.50%
Healthcare cost trend rate	[1]		7.00%	7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	[1]	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	[1]		2022	2021
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Service cost		$ 1	$ 4	$ 4
Interest cost		5	11	12
Expected return on plan assets		(16)	(28)	(24)
Amortization of prior service (credit) cost		(5)	(4)	(3)
Amortization of net actuarial loss		3	3	2
Settlements and curtailments		1
Net periodic benefit (credit) cost		(11)	(14)	(9)
Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities:
Current year net actuarial (gain) loss		(21)	16	18
Prior service (credit) cost		0	(4)	(61)
Amortization of net actuarial loss		(3)	(3)	(2)
Amortization of prior service credit (cost)		5	4	3
Total recognized in other comprehensive income and regulatory assets and liabilities		$ (19)	$ 13	$ (42)
Significant assumptions used to determine periodic cost:
Discount rate			3.81%	4.47%
Expected long-term rate of return on plan assets		8.50%	8.50%	8.50%
Healthcare cost trend rate	[1]	6.50%	7.00%	7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	[1]	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	[1]	2025	2022	2021
Other Postretirement Benefits | Minimum
Significant assumptions used to determine periodic cost:
Discount rate		4.05%		3.92%
Healthcare cost trend rate	[1]	6.50%
Year that the rate reaches the ultimate trend rate	[1]	2023
Other Postretirement Benefits | Minimum | Dominion Energy Gas Holdings, LLC
Significant assumptions used to determine periodic cost:
Discount rate		4.05%
Other Postretirement Benefits | Maximum
Significant assumptions used to determine periodic cost:
Discount rate		4.41%		4.47%
Healthcare cost trend rate	[1]	6.60%
Year that the rate reaches the ultimate trend rate	[1]	2025
Other Postretirement Benefits | Maximum | Dominion Energy Gas Holdings, LLC
Significant assumptions used to determine periodic cost:
Discount rate		4.37%
[1]	Assumptions used to determine net periodic cost for the following year.

Employee Benefit Plans (AOCI an

Employee Benefit Plans (AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost) (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		$ 1,793	$ 1,700
Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		187	169
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		3,327	3,477
Prior service (credit) cost		5	7
Total	[1]	3,332	3,484
Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		150	555
Prior service (credit) cost		0	0
Total	[2]	150	555
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		241	350
Prior service (credit) cost		(339)	(393)
Total	[1]	(98)	(43)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss		44	89
Prior service (credit) cost		(49)	(52)
Total	[2]	$ (5)	$ 37
[1]	As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2]	As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $37 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

Employee Benefit Plans (AOCI _2

Employee Benefit Plans (AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost) (Parenthetical) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total	[1]	$ 3,332	$ 3,484
Amount included in AOCI		2,000	2,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total	[1]	(98)	(43)
Amount included in AOCI		(65)	(41)
Dominion Energy Gas Holdings, LLC | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total	[2]	150	555
Amount included in AOCI		147	200
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total	[2]	$ (5)	37
Dominion Energy Gas Holdings, LLC | Noncurrent Assets of Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total			$ 22
[1]	As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2]	As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $37 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

Employee Benefit Plans (Compone

Employee Benefit Plans (Components of AOCI and Regulatory Assets and Liabilities) (Detail) $ in Millions	Dec. 31, 2019USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 194
Prior service (credit) cost	1
Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	7
Prior service (credit) cost	0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	5
Prior service (credit) cost	(50)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	2
Prior service (credit) cost	$ (5)

Employee Benefit Plans (Effect

Employee Benefit Plans (Effect of One Percentage Point Change on Benefit Plans) (Detail) - Other Postretirement Benefits $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on total of service and interest cost components	$ 20
Effect of one percentage point increase on other postretirement benefit obligation	153
Effect of one percentage point decrease on total of service and interest cost components	(11)
Effect of one percentage point decrease on other postretirement benefit obligation	(128)
Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on total of service and interest cost components	2
Effect of one percentage point increase on other postretirement benefit obligation	14
Effect of one percentage point decrease on total of service and interest cost components	(2)
Effect of one percentage point decrease on other postretirement benefit obligation	$ (12)

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Detail) gal in Millions, MMcf in Millions, $ in Millions

Feb. 01, 2020USD ($)

Sep. 30, 2019USD ($)

Jul. 31, 2019USD ($)

May 31, 2019USD ($)T

Mar. 31, 2019USD ($)MMcf

Feb. 28, 2019USD ($)

Jan. 31, 2019USD ($)

Aug. 31, 2018USD ($)

Jun. 30, 2018USD ($)

Aug. 31, 2016T

Apr. 30, 2015Facility

Mar. 31, 2019USD ($)MMcf

Jun. 30, 2018USD ($)

Dec. 31, 2019USD ($)Facilitygal

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Loss Contingencies [Line Items]

ARO incurred

$ 2,413

[1]

$ 20

Regulatory liability

11,498

7,196

Impairment of assets and other charges

1,535

403

$ 15

Property, Plant and Equipment, Net

$ 69,082

54,560

DESC

Loss Contingencies [Line Items]

Contesting amount for filed liens in Fairfield country

$ 285

DESC | NND Project costs

Loss Contingencies [Line Items]

Equity method investment, ownership percentage

55.00%

SCDOR | DESC

Loss Contingencies [Line Items]

Proposed assessment amount from audit

$ 410

Proportionate Share of NND Project

100.00%

SOUTH CAROLINA | DESC

Loss Contingencies [Line Items]

Amount claimed by plaintiffs in legal matter

$ 100

Percentage claimed by plaintiffs in legal matter

100.00%

DESC Ratepayer Case

Loss Contingencies [Line Items]

Litigation settlement paid

$ 520

Virginia Electric and Power Company

Loss Contingencies [Line Items]

ARO incurred

$ 2,408

[1]

14

Regulatory liability

5,241

4,946

Asset Impairment Charges After Tax

$ 119

Impairment of assets and other charges

$ 160

757

Property, Plant and Equipment, Net

32,882

$ 30,521

Litigation settlement paid

$ 7

Virginia Electric and Power Company | Future Ash Pond and Landfill Closure Costs

Loss Contingencies [Line Items]

ARO incurred

$ 202

Virginia Electric and Power Company | Increase In Property Plant And Equipment

Loss Contingencies [Line Items]

ARO incurred

1,300

$ 46

Virginia Electric and Power Company | Increase in Regulatory Assets

Loss Contingencies [Line Items]

ARO incurred

4

Virginia Electric and Power Company | Cost of Landfills and Beneficial Reuse

Loss Contingencies [Line Items]

ARO incurred

2,400

131

Virginia Electric and Power Company | Other operations and maintenance

Loss Contingencies [Line Items]

ARO incurred

113

81

ARO incurred, after tax

$ 84

$ 60

Virginia Electric and Power Company | Impairment Of Assets And Other Charges [Member]

Loss Contingencies [Line Items]

Asset Impairment Charges After Tax

$ 12

46

$ 257

Impairment of assets and other charges

$ 17

$ 62

346

Virginia Electric and Power Company | Minimum

Loss Contingencies [Line Items]

Proposed revenue requirement

$ 225

SCANA

Loss Contingencies [Line Items]

Reserves

696

SCANA | DESC Ratepayer Case

Loss Contingencies [Line Items]

Credit in future electric rate relief

2

Escrow account

2

Cash payment

$ 117

115

Property, Plant and Equipment, Net

$ 54

SCANA | Other Receivables [Member]

Loss Contingencies [Line Items]

Insurance receivables

111

SCANA | Impairment Of Assets And Other Charges [Member]

Loss Contingencies [Line Items]

Asset Impairment Charges After Tax

480

Impairment of assets and other charges

641

SCANA | Minimum | DESC Ratepayer Case

Loss Contingencies [Line Items]

Proceeds from sale of property

60

SCANA | Maximum | DESC Ratepayer Case

Loss Contingencies [Line Items]

Proceeds from sale of property

$ 85

CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category

Loss Contingencies [Line Items]

Compliance date

2023-12

CWA | EPA | 2015 Effluent Limitations Guidelines Rule for Steam Electric Power Generating Category

Loss Contingencies [Line Items]

Compliance date

2020-11

CCR | Virginia Electric and Power Company | Minimum

Loss Contingencies [Line Items]

Cubic yards of CCR required by legislation to be beneficially reused | MMcf

6.8

6.8

Carbon Regulations

Loss Contingencies [Line Items]

Significant emission rate per rear CO2 equivalent | T

75,000

Unfavorable Regulatory Action | EPA

Loss Contingencies [Line Items]

Electric generating station facilities heightened entrainment analysis per day | gal

125

Unfavorable Regulatory Action | VDEQ

Loss Contingencies [Line Items]

Significant emission rate initial carbon cap | T

28

Significant emission rate ultimate carbon cap | T

19.6

Unfavorable Regulatory Action | CWA

Loss Contingencies [Line Items]

Number of facilities that may be subject to final regulations | Facility

13

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Former Gas Plant Site with Post Closure Groundwater Monitoring Program

Loss Contingencies [Line Items]

Environmental remediation reserves

$ 34

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program

Loss Contingencies [Line Items]

Environmental remediation reserves

16

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program | Other operations and maintenance

Loss Contingencies [Line Items]

Environmental Remediation Expense

$ 16

Environmental Remediation Expense, net of tax

$ 12

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | SCANA

Loss Contingencies [Line Items]

Updated remediation work plan, cost increase

$ 8

Unfavorable Regulatory Action | CCR | Facilities Subject to Coal Combustion Residual Final Rule | Environmental Protection Agency Final Rule Regulating Management of CCRs

Loss Contingencies [Line Items]

Number of facilities with CCR | Facility

11

U S department of treasury [member] | FERC-regulated | Virginia Electric and Power Company

Loss Contingencies [Line Items]

Regulatory liability

$ 7

[1]

Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.

Commitments and Contingencies_3

Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident in summer per year			$ 14,000,000
NRC minimum requirement for nuclear power plant licensees			1,060,000,000
Maximum assessment for premiums on insurance policy			31,000,000
Maximum assessment for insurance policy			81,000,000
Spent Nuclear Fuel
Loss Contingencies [Line Items]
Receivables			52,000,000	$ 49,000,000
Maximum
Loss Contingencies [Line Items]
Amount that could be assessed for each licensed reactor			138,000,000
Amount that could be assessed for each licensed reactor per reactor			21,000,000
Nuclear Obligations
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident amount		$ 14,100,000,000	13,900,000,000
Virginia Electric and Power Company
Loss Contingencies [Line Items]
Maximum assessment for premiums on insurance policy			50,000,000
Maximum assessment for insurance policy			10,000,000
Virginia Electric and Power Company | Spent Nuclear Fuel
Loss Contingencies [Line Items]
Receivables			35,000,000	30,000,000
DESC
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident amount			138,000,000
Minimum Liability Protection Per Nuclear Incident Amount			21,000,000
Maximum liability protection per nuclear incident in summer			92,000,000
Public liability claims			14,000,000
Maximum of Claim Liability Insured			450,000,000
DESC | NEIL
Loss Contingencies [Line Items]
Maximum loss for any single loss occurrence			2,750,000,000
Annual Premium			24,000,000
DESC | Nuclear Obligations | NEIL
Loss Contingencies [Line Items]
Property insurance coverage			2,750,000,000
DESC | Non-nuclear Obligation | NEIL
Loss Contingencies [Line Items]
Property insurance coverage			2,330,000,000
DESC | Non-nuclear Obligation | European Mutual Association
Loss Contingencies [Line Items]
Property insurance coverage			415,000,000
Annual Premium			2,000,000
Surry and North Anna
Loss Contingencies [Line Items]
Settlement amount			15,000,000	16,000,000	$ 22,000,000
Millstone
Loss Contingencies [Line Items]
Settlement amount			11,000,000	$ 13,000,000	$ 14,000,000
Millstone | Dominion Energy and Virginia Electric and Power
Loss Contingencies [Line Items]
Amount of coverage purchased from commercial insurance pools			450,000,000
Millstone Unit 1
Loss Contingencies [Line Items]
Minimum financial assurance			2,800,000,000
Kewaunee
Loss Contingencies [Line Items]
Maximum assessment for premiums on insurance policy	$ 50,000,000
Kewaunee | Nuclear Obligations
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident amount			100,000,000
Kewaunee | Virginia Electric and Power Company
Loss Contingencies [Line Items]
Minimum financial assurance			1,800,000,000
Summer Unit
Loss Contingencies [Line Items]
Settlement amount			$ 3,000,000

Commitments and Contingencies_4

Commitments and Contingencies (Nuclear Insurance) (Detail)	Dec. 31, 2019USD ($)
Millstone
Guarantor Obligations [Line Items]
Property insurance coverage	$ 1,700,000,000
Kewaunee
Guarantor Obligations [Line Items]
Property insurance coverage	50,000,000
Summer
Guarantor Obligations [Line Items]
Property insurance coverage	2,750,000,000
Surry | Virginia Electric and Power Company
Guarantor Obligations [Line Items]
Property insurance coverage	1.70
North Anna | Virginia Electric and Power Company
Guarantor Obligations [Line Items]
Property insurance coverage	$ 1.70

Commitment and Contingencies (S

Commitment and Contingencies (Schedule of Long Term Purchase Commitments) (Detail) - Virginia Electric and Power Company - Purchased electric capacity $ in Millions	Dec. 31, 2019USD ($)	[1]
Long-term Purchase Commitment [Line Items]
2020	$ 45
2021	44
2022	44
2023	44
2024	44
Thereafter	494
Total	$ 715
[1]	Commitments represent estimated amounts payable for energy under power purchase contracts with qualifying facilities which expire at various dates through 2046. Energy payments are generally based on fixed dollar amounts per month and totaled $29 million for the year ended December 31, 2019.

Commitment and Contingencies _2

Commitment and Contingencies (Schedule of Long Term Purchase Commitments) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Virginia Electric and Power Company | Energy payments
Long-term Purchase Commitment [Line Items]
Energy payments	$ 29

Commitments and Contingencies_5

Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($)		1 Months Ended
		Feb. 29, 2020	Oct. 31, 2017	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Debt maximum borrowing capacity	[1]			$ 6,000,000,000		$ 6,000,000,000
Maximum Exposure				5,151,000,000
Revolving Credit Facility
Guarantor Obligations [Line Items]
Debt maximum borrowing capacity					$ 700,000,000
Cove Point
Guarantor Obligations [Line Items]
Maximum Exposure				1,900,000,000
Virginia Electric and Power Company
Guarantor Obligations [Line Items]
Debt maximum borrowing capacity	[2]			6,000,000,000		6,000,000,000
Dominion Energy Gas Holdings, LLC
Guarantor Obligations [Line Items]
Debt maximum borrowing capacity	[3]			1,500,000,000		1,500,000,000
Nuclear Obligations
Guarantor Obligations [Line Items]
Maximum Exposure				182,000,000
Commodity Transactions
Guarantor Obligations [Line Items]
Maximum Exposure				2,215,000,000
Financial Guarantee [Member] | Revolving Credit Facility | Atlantic Coast Pipeline
Guarantor Obligations [Line Items]
Debt maximum borrowing capacity			$ 3,400,000,000
Financial Guarantee [Member] | Equity Method Investee [Member]
Guarantor Obligations [Line Items]
Maximum potential loss exposure, limited guarantee percentage			48.00%
Guarantee liability				14,000,000		$ 21,000,000
Guarantee recorded amount				1,800,000,000
Maximum Exposure				27,000,000
Solar
Guarantor Obligations [Line Items]
Maximum Exposure				477,000,000
Other
Guarantor Obligations [Line Items]
Maximum Exposure				377,000,000
Surety Bond [Member]
Guarantor Obligations [Line Items]
Maximum Exposure				163,000,000
Surety Bond [Member] | Virginia Electric and Power Company
Guarantor Obligations [Line Items]
Maximum Exposure				77,000,000
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC
Guarantor Obligations [Line Items]
Maximum Exposure				26,000,000
Financial Standby Letter of Credit [Member]
Guarantor Obligations [Line Items]
Maximum Exposure				$ 89,000,000
Subsequent Event | Financial Guarantee [Member] | Equity Method Investee [Member] | Atlantic Coast Pipeline
Guarantor Obligations [Line Items]
Additional borrowing		$ 27,000,000
[1]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[3]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

Credit Risk (Narrative) (Detail

Credit Risk (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)Customer	Dec. 31, 2018USD ($)
Concentration Risk And Guarantor Obligations [Line Items]
Gross credit exposure	$ 233
Additional collateral to be posted if the credit related contingent features were triggered	10	$ 1
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position	10	$ 1
Virginia Electric and Power Company
Concentration Risk And Guarantor Obligations [Line Items]
Gross credit exposure	71
Additional collateral to be posted if the credit related contingent features were triggered	8
Dominion Energy Gas Holdings, LLC
Concentration Risk And Guarantor Obligations [Line Items]
Gross credit exposure	$ 46
Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Largest Customer
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	17.00%	12.00%
Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Export Customers
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	34.00%	32.00%
Credit Concentration Risk
Concentration Risk And Guarantor Obligations [Line Items]
Amount of exposure for single counterparty	$ 61
Credit Concentration Risk | Virginia Electric and Power Company
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	96.00%
Amount of exposure for single counterparty	$ 61
Credit Concentration Risk | Dominion Energy Gas Holdings, LLC
Concentration Risk And Guarantor Obligations [Line Items]
Amount of exposure for single counterparty	$ 9
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	88.00%
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty | Dominion Energy Gas Holdings, LLC
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	81.00%
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	98.00%
Number of customers | Customer	296
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Ten Largest Customers
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	38.00%
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Thirty Largest Customers
Concentration Risk And Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	72.00%

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Detail) - USD ($)		Feb. 01, 2020	May 31, 2019	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2016
Related Party Transaction [Line Items]
Derivative Asset					$ 93,000,000	$ 294,000,000
Derivative Liabilities					740,000,000	279,000,000
Interest income							$ 11,000,000
Debt maximum borrowing capacity	[1]				6,000,000,000	6,000,000,000
Interest income from bonds					101,000,000	84,000,000	82,000,000
Capital expenditures					4,980,000,000	4,254,000,000	5,504,000,000
DESC Ratepayer Case
Related Party Transaction [Line Items]
Litigation settlement		$ 520,000,000
Portion of Litigation Settlement		$ 320,000,000
Commercial Paper | DMLPHCII
Related Party Transaction [Line Items]
Interest Rate											2.75%
Debt Instrument, Face Amount											$ 15,000,000
Term Loan Credit Agreement
Related Party Transaction [Line Items]
Credit facility, outstanding amount						3,000,000,000			$ 3,000,000,000
Revolving Credit Facility
Related Party Transaction [Line Items]
Debt maximum borrowing capacity										$ 700,000,000
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Derivative Asset					8,000,000	31,000,000
Derivative Liabilities					86,000,000	19,000,000
Payable to affiliates					260,000,000	3,097,000,000
Affiliated receivables					362,000,000	319,000,000
Business Combination, Acquisition Related Costs					603,000,000	230,000,000	239,000,000
Debt maximum borrowing capacity	[2]				1,500,000,000	1,500,000,000
Interest income from bonds					105,000,000	26,000,000	4,000,000
Capital expenditures					704,000,000	1,109,000,000	1,815,000,000
Dominion Energy Gas Holdings, LLC | DGP
Related Party Transaction [Line Items]
Capital expenditures						704,000,000
Dominion Energy Gas Holdings, LLC | Commercial Paper
Related Party Transaction [Line Items]
Payable to affiliates					$ 1,800,000,000
Interest Rate					2.50%
Interest income					$ 5,000,000
Dominion Energy Gas Holdings, LLC | Commercial Paper | Maximum
Related Party Transaction [Line Items]
Debt maximum borrowing capacity								$ 3,000,000,000
Dominion Energy Gas Holdings, LLC | IRCA
Related Party Transaction [Line Items]
Interest income from bonds					14,000,000	15,000,000	5,000,000
Dominion Energy Gas Holdings, LLC | IRCA | DCP
Related Party Transaction [Line Items]
Payable to affiliates						$ 2,800,000,000
Weighted- average interest rate percentage						3.43%
Interest charges related to others					94,000,000	$ 96,000,000	82,000,000
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | DCP
Related Party Transaction [Line Items]
Payable to affiliates					$ 9,000,000	$ 57,000,000
Weighted- average interest rate percentage					3.85%	3.45%
Interest charges related to others					$ 3,000,000	$ 1,000,000	1,000,000
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA
Related Party Transaction [Line Items]
Payable to affiliates					$ 251,000,000	$ 218,000,000
Weighted- average interest rate percentage					2.02%	2.78%
Interest charges related to others					$ 3,000,000	$ 1,000,000
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA | DMLPHCII
Related Party Transaction [Line Items]
Payable to affiliates						$ 22,000,000
Weighted- average interest rate percentage						3.43%
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA | Maximum | DMLPHCII
Related Party Transaction [Line Items]
Interest charges related to others						$ 1,000,000
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent					326,000,000	319,000,000
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Unbilled Revenues [Member]
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent					22,000,000	7,000,000
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent					17,000,000	13,000,000
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Derivative Asset					24,000,000	93,000,000
Derivative Liabilities					466,000,000	103,000,000
Payable to affiliates					107,000,000	224,000,000
Affiliated receivables					27,000,000	101,000,000
Interest income							11,000,000
Debt maximum borrowing capacity	[3]				6,000,000,000	6,000,000,000
Interest income from bonds					11,000,000	10,000,000	19,000,000
Capital expenditures					2,642,000,000	2,228,000,000	$ 2,496,000,000
Litigation settlement			$ 7,000,000
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Derivative Asset					3,000,000	26,000,000
Derivative Liabilities					53,000,000	10,000,000
Virginia Electric and Power Company | Principal Owner
Related Party Transaction [Line Items]
Payable to affiliates					$ 107,000,000	$ 224,000,000
Weighted- average interest rate percentage					3.22%	2.94%
Virginia Electric and Power Company | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due to Dominion, noncurrent					$ 782,000,000	$ 632,000,000
Virginia Electric and Power Company | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent					287,000,000	254,000,000
East Ohio | Commercial Paper
Related Party Transaction [Line Items]
Affiliated receivables					1,700,000,000	1,400,000,000
Interest income					$ 72,000,000	64,000,000
East Ohio | Commercial Paper | Maximum
Related Party Transaction [Line Items]
Interest Rate					4.90%
East Ohio | Commercial Paper | Minimum
Related Party Transaction [Line Items]
Interest Rate					3.67%
Dominion Energy Midstream Partners, LP
Related Party Transaction [Line Items]
Credit facility, outstanding amount				$ 73,000,000
Dominion Energy Midstream Partners, LP | Term Loan Credit Agreement | Commercial Paper
Related Party Transaction [Line Items]
Interest Rate				3.50%
Interest charges related to others					$ 10,000,000
Debt Instrument, Face Amount				$ 400,000,000
Proceeds from issuance of medium term notes				$ 395,000,000
Cove Point | Term Loan Credit Agreement | Commercial Paper
Related Party Transaction [Line Items]
Credit facility, outstanding amount						$ 3,000,000,000
Interest Rate						3.60%
Interest income					$ 82	$ 21,000,000
[1]	This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[3]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At December 31, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.

Related-Party Transactions (Det

Related-Party Transactions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Commodity purchases from affiliates	$ 690	$ 930	$ 674
Services provided by affiliates	503	450	453
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Services provided to related parties	24	24	25
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Services provided to related parties	164	260	190
Commodity purchases from affiliates	249	168	173
Services provided by affiliates	226	169	193
Other receivables	7	13
Other deferred charges and other assets	12
Dominion Energy Gas Holdings, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Services provided to related parties	12		$ 10
Imbalances receivable from affiliates	8	16
Imbalances payable to affiliates	$ 1	$ 4

Related-Party Transactions (Par

Related-Party Transactions (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Capital expenditures	$ 4,980	$ 4,254	$ 5,504
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Capital expenditures	2,642	2,228	2,496
Virginia Electric and Power Company | Services provided by affiliates | Affiliated Entity
Related Party Transaction [Line Items]
Capital expenditures	133	145	144
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Capital expenditures	704	1,109	1,815
Dominion Energy Gas Holdings, LLC | Services provided by affiliates | Affiliated Entity
Related Party Transaction [Line Items]
Capital expenditures	$ 19	$ 37	$ 53

Operating Segments (Narrative)

Operating Segments (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
After-tax charge related to the impairment of gathering and processing assets				$ 164
Gain loss on investments held in nuclear decommissioning trust funds, after tax					$ (93)	$ (17)	$ 141
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act	[1]					46	(851)
Charges associated with equity method investments in wind-powered generation facilities							158
Charge related to a voluntary retirement program					320
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					(17)	2	16
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act	[1]				0	21	(93)
Charge related to a voluntary retirement program					116
Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					(18)	(45)	26
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act	[1]					(6)	(246)
Transaction and transition costs related to acquisition					603	230	239
Charge related to a voluntary retirement program					20
Virginia Legislation | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Benefit from revision of future closure costs					113
Benefit from revision of future closure costs, after tax					84
Corporate and Other
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)					(627)
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Asset early retirement expense					160
Asset early retirement expense after tax					119
Contract termination with a non-utility generator					135
Contract termination with a non-utility generator, after tax					100
Abandonment expense					62
Abandonment expense, after tax					46
Dominion Energy Virginia | Virginia Legislation | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Benefit from revision of future closure costs					113
Benefit from revision of future closure costs, after tax					84
Dominion Energy South Carolina Inc
Segment Reporting Information [Line Items]
Charge for refund of amounts from customers, after tax					756
Charge for refund of amounts from customers					1,000
Remeasured Subsequent To Initial Recognition
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					1,000
SCANA
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds					150
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					194
Transaction and transition costs related to acquisition			$ 1,300		484
Transaction and transition costs related to acquisition, after tax					315
Income tax related to regulatory assets acquired					258
Charge related to a voluntary retirement program					444
Charge related to a voluntary retirement program, after-tax					332
Charge related to a voluntary retirement program after tax		$ 316
SCANA | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax					151
SCANA | Gas, Transmission & Storage
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax					5
SCANA | Contracted Generation
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax					38
SCANA | Dominion Energy South Carolina Inc
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					194
Transaction and transition costs related to acquisition					641
Transaction and transition costs related to acquisition, after tax					480
Income tax related to regulatory assets acquired			$ 258
Charge related to a voluntary retirement program, after-tax					75
Charge for property, plant and equipment acquired but committed to forgo recovery					114
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax					86
SCANA | Gas Distribution
Segment Reporting Information [Line Items]
Charge related to a voluntary retirement program, after-tax					56
Operating Segments
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds					553	170
Gain loss on investments held in nuclear decommissioning trust funds, after tax					411	134
After- tax net benefit (expenses)					(2,000)	(88)	861
Benefit associated with sale of certain merchant generation facilities and equity method investments						828
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax						619
Operating Segments | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act							93
Charge related to a voluntary retirement program					198
Charge related to a voluntary retirement program, after-tax					146
Operating Segments | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)						(107)	(156)
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act							169
Charge for disallowance of FERC-regulated plant						124
After-tax charge for disallowance of FERC-regulated plant						88
Charge for disallowance of FERC-regulated plant						124
Operating Segments | Virginia Regulation
Segment Reporting Information [Line Items]
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities						81
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax						60
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)					(2,600)	(611)	377
Operating Segments | Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)					(634)	(312)	74
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)					127	(90)	$ 389
Tax benefit resulting from changes in tax status ofsubsidiaries					48
Charge related to a voluntary retirement program					42
Charge related to a voluntary retirement program after tax					31
Operating Segments | Gas Infrastructure
Segment Reporting Information [Line Items]
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax						390
Operating Segments | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					49	14
Operating Segments | Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Asset early retirement expense					346
Asset early retirement expense after tax					257
Operating Segments | Dominion Energy Virginia | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
After- tax net benefit (expenses)					12
Asset early retirement expense					346
Asset early retirement expense after tax					257
Operating Segments | Dominion Energy Virginia | Virginia Legislation
Segment Reporting Information [Line Items]
One-time rate credit amount						215
One-time rate credit amount after tax						160
Operating Segments | Power Delivery
Segment Reporting Information [Line Items]
Charge associated with major storm damage and service restoration						70
Charge associated with major storm damage and service restoration, after tax						52
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax						229
Operating Segments | Gas, Transmission & Storage
Segment Reporting Information [Line Items]
After-tax charge related to the impairment of gathering and processing assets						164
Charge related to impairment of certain gathering and processing assets						219
Operating Segments | Contracted Generation
Segment Reporting Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds, after tax					362	$ 120
Charges associated with equity method investments in wind-powered generation facilities					158
Charges associated with equity method investments in wind-powered generation facilities, after tax					96
Operating Segments | Remeasured Subsequent To Initial Recognition | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					83
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas, Transmission & Storage
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					302
Operating Segments | Remeasured Subsequent To Initial Recognition | Contracted Generation
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					569
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas Distribution
Segment Reporting Information [Line Items]
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act					$ 56
[1]	The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

Operating Segments (Schedule of

Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating revenue		$ 4,475	$ 4,269	$ 3,970	$ 3,858	$ 3,361	$ 3,451	$ 3,088	$ 3,466	$ 16,572	[1]	$ 13,366	[1]	$ 12,586	[1]
Depreciation, depletion and amortization										2,655		2,000		1,905
Equity in earnings of equity method investees										168		197		(18)
Interest income										101		84		82
Interest and related charges										1,773		1,493		1,205
Income tax expense (benefit)										351		580		(30)
Net income (loss)		1,009	975	54	(680)	641	854	449	503	1,358		2,447		2,999
Investment in equity method investees		1,646				1,278				1,646		1,278
Capital expenditures										5,321
Total assets		103,823				77,914				103,823		77,914
Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue		571	502	530	566	566	533	508	389	2,169	[2]	1,996	[2]	1,523	[2]
Depreciation, depletion and amortization										367		333		242
Equity in earnings of equity method investees										43		54		47
Interest income										105		26		4
Interest and related charges	[2]									311		174		60
Income tax expense (benefit)										101		124		(65)
Net Income (loss) from discontinued operations	[3]									141		24		163
Net income (loss)		261	151	119	190	27	191	83	180	721		481		703
Investment in equity method investees		312				339				312		339
Capital expenditures										704		1,109		1,815
Total assets		18,784				26,751				18,784		26,751
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue		1,941	2,264	1,938	1,965	1,810	2,232	1,829	1,748	8,108	[4]	7,619	[4]	7,556	[4]
Depreciation, depletion and amortization										1,223		1,132		1,141
Interest income										11		10		19
Interest and related charges	[4]									524		511		494
Income tax expense (benefit)										264		300		774
Net income (loss)		427	$ 602	$ 100	$ 20	239	$ 520	$ 339	$ 184	1,149		1,282		1,540
Capital expenditures										2,981		2,542		2,729
Total assets		41,428				36,880				41,428		36,880
Dominion Energy South Carolina
Segment Reporting Information [Line Items]
Operating revenue										2,948
Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating revenue										8,170		8,401		8,254
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue										8,137		7,835		7,556
Depreciation, depletion and amortization										1,215		1,157		1,141
Interest income										11		10		19
Interest and related charges										529		516		497
Income tax expense (benefit)										481		378		868
Net income (loss)										1,783		1,594		1,466
Capital expenditures										2,981		2,542		2,729
Total assets		41,400				37,000				41,400		37,000
Gas, Transmission & Storage
Segment Reporting Information [Line Items]
Operating revenue										3,074		1,867		1,054
Gas, Transmission & Storage | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue										2,186		1,996		1,523
Depreciation, depletion and amortization										367		333		242
Equity in earnings of equity method investees										43		54		47
Interest income										105		26		4
Interest and related charges										309		173		60
Income tax expense (benefit)										170		226		189
Net income (loss)										594		571		314
Investment in equity method investees		312				339				312		339
Capital expenditures										391		749		1,459
Total assets		18,800				19,900				18,800		19,900
Gas Distribution
Segment Reporting Information [Line Items]
Operating revenue										2,367		1,769		1,778
Contracted Generation
Segment Reporting Information [Line Items]
Operating revenue										1,135		1,487		1,345
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenue										(1,122)		(249)		(27)
Corporate and Other | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue										(17)
Interest income										0
Interest and related charges										2		1
Income tax expense (benefit)										(69)		(102)		(254)
Net Income (loss) from discontinued operations										141		24		163
Net income (loss)										127		(90)		389
Capital expenditures										313		360		356
Total assets		0				6,900				0		6,900
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue										29		216
Depreciation, depletion and amortization										8		(25)
Interest and related charges										(5)		(5)		(3)
Income tax expense (benefit)										(217)		(78)		(94)
Net income (loss)										(634)		(312)		74
Total assets						(100)						(100)
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating revenue												91		182
Interest income										(386)		(271)		(222)
Interest and related charges										(386)		(272)		(222)
Total assets		(9,700)				(12,900)				(9,700)		(12,900)
Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue										(1,470)		(918)		(1,008)
Intersegment revenue | Dominion Energy South Carolina
Segment Reporting Information [Line Items]
Operating revenue										4
Intersegment revenue | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating revenue										(13)		(552)		(688)
Intersegment revenue | Gas, Transmission & Storage
Segment Reporting Information [Line Items]
Operating revenue										247		723		946
Intersegment revenue | Gas Distribution
Segment Reporting Information [Line Items]
Operating revenue										18		16		17
Intersegment revenue | Contracted Generation
Segment Reporting Information [Line Items]
Operating revenue										15		8		9
Intersegment revenue | Corporate and Other
Segment Reporting Information [Line Items]
Operating revenue										1,199		723		724
Eliminations
Segment Reporting Information [Line Items]
Operating revenue										(1,470)		(827)		(826)
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures												4,405		5,909
Operating Segments | Dominion Energy South Carolina
Segment Reporting Information [Line Items]
Operating revenue										2,952
Depreciation, depletion and amortization										452
Equity in earnings of equity method investees										(4)
Interest income										9
Interest and related charges										242
Income tax expense (benefit)										163
Net income (loss)										430
Capital expenditures										562
Total assets		15,800								15,800
Operating Segments | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating revenue										8,157		7,849		7,566
Depreciation, depletion and amortization										1,216		1,158		1,141
Interest income										11		10		19
Interest and related charges										530		516		497
Income tax expense (benefit)										482		380		865
Net income (loss)										1,786		1,596		1,466
Capital expenditures										3,002		2,640		2,726
Total assets		43,700				39,100				43,700		39,100
Operating Segments | Gas, Transmission & Storage
Segment Reporting Information [Line Items]
Operating revenue										3,321		2,590		2,000
Depreciation, depletion and amortization										400		348		260
Equity in earnings of equity method investees										161		178		158
Interest income										211		143		114
Interest and related charges										405		262		100
Income tax expense (benefit)										262		236		291
Net income (loss)										934		844		552
Investment in equity method investees		1,517				1,159				1,517		1,159
Capital expenditures										431		765		1,489
Total assets		20,900				22,600				20,900		22,600
Operating Segments | Gas Distribution
Segment Reporting Information [Line Items]
Operating revenue										2,385		1,785		1,795
Depreciation, depletion and amortization										335		263		258
Equity in earnings of equity method investees										2
Interest income										4
Interest and related charges										116		79		72
Income tax expense (benefit)										114		95		195
Net income (loss)										488		373		351
Investment in equity method investees		32								32
Capital expenditures										848		647		452
Total assets		16,000				11,800				16,000		11,800
Operating Segments | Contracted Generation
Segment Reporting Information [Line Items]
Operating revenue										1,150		1,495		1,354
Depreciation, depletion and amortization										179		213		200
Equity in earnings of equity method investees										(1)		18		(171)
Interest income										92		80		77
Interest and related charges										98		124		110
Income tax expense (benefit)										20		75		(160)
Net income (loss)										276		245		253
Investment in equity method investees		74				82				74		82
Capital expenditures										367		247		979
Total assets		10,200				9,000				10,200		9,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating revenue										77		474		697
Depreciation, depletion and amortization										73		18		46
Equity in earnings of equity method investees										10		1		(5)
Interest income										160		122		94
Interest and related charges										768		784		648
Income tax expense (benefit)										(690)		(206)		(1,221)
Net income (loss)										(2,556)		(611)		377
Investment in equity method investees		23				37				23		37
Capital expenditures										111		106		$ 263
Total assets		$ 6,900				$ 8,300				$ 6,900		$ 8,300
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to related parties.
[3]	Includes income tax expense of $33 million, less than $1 million and $91 million in 2019, 2018 and 2017, respectively.
[4]	See Note 25 for amounts attributable to affiliates.

Quarterly Financial and Common

Quarterly Financial and Common Stock Data (Unaudited) (Quarterly Financial and Common Stock Data) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Operating revenue	$ 4,475	$ 4,269	$ 3,970	$ 3,858	$ 3,361	$ 3,451	$ 3,088	$ 3,466	$ 16,572	[1]	$ 13,366	[1]	$ 12,586	[1]
Income (loss) from operations	1,221	1,314	461	(482)	834	1,150	742	875	2,514		3,601		3,937
Net income including noncontrolling interests	1,010	985	58	(677)	662	883	478	526	1,376		2,549		3,120
Net income (loss)	$ 1,009	$ 975	$ 54	$ (680)	$ 641	$ 854	$ 449	$ 503	$ 1,358		$ 2,447		$ 2,999
Net income attributable to Dominion Energy — Basic	$ 1.22	$ 1.19	$ 0.07	$ (0.86)	$ 0.97	$ 1.31	$ 0.69	$ 0.77	$ 1.66		$ 3.74		$ 4.72
Net income attributable to Dominion Energy — Diluted	1.21	1.17	0.05	(0.86)	0.97	1.30	0.69	0.77	1.62		3.74		4.72
Dividends declared per common share	$ 0.9175	$ 0.9175	$ 0.9175	$ 0.9175	$ 0.835	$ 0.835	$ 0.835	$ 0.835	$ 3.67		$ 3.34		$ 3.035
Virginia Electric and Power Company
Condensed Financial Statements, Captions [Line Items]
Operating revenue	$ 1,941	$ 2,264	$ 1,938	$ 1,965	$ 1,810	$ 2,232	$ 1,829	$ 1,748	$ 8,108	[2]	$ 7,619	[2]	$ 7,556	[2]
Income (loss) from operations	659	820	238	122	418	756	533	364	1,839		2,071		2,732
Net income (loss)	427	602	100	20	239	520	339	184	1,149		1,282		1,540
Dominion Energy Gas Holdings, LLC
Condensed Financial Statements, Captions [Line Items]
Operating revenue	571	502	530	566	566	533	508	389	2,169	[3]	1,996	[3]	1,523	[3]
Income (loss) from operations	276	202	179	247	228	302	90	167	904		787		552
Net income including noncontrolling interests	292	175	149	226	72	242	129	213	842		656		829
Net income from continuing operations	276	130	123	172	182	209	84	157
Net income (loss) from discontinued operations	16	45	26	54	(110)	33	45	56
Net income (loss)	$ 261	$ 151	$ 119	$ 190	$ 27	$ 191	$ 83	$ 180	$ 721		$ 481		$ 703
Preferred Class A
Condensed Financial Statements, Captions [Line Items]
Dividends declared per preferred share	$ 4.375	$ 4.375	$ 0.729
Preferred Class B
Condensed Financial Statements, Captions [Line Items]
Dividends declared per preferred share	$ 1.9375
[1]	See Note 9 for amounts attributable to related parties.
[2]	See Note 25 for amounts attributable to affiliates.
[3]	See Note 25 for amounts attributable to related parties.

Quarterly Financial and Commo_2

Quarterly Financial and Common Stock Data (Unaudited) (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Parent Company Only Financial Information [Line Items]
After-tax gains from the sale of certain merchant generation facilities				$ 536
After-tax impairment charge for certain gathering and processing assets				$ 164
After-tax charge for disallowance of FERC-regulated plant					$ 89
After-taxcharge associated with Virginia legislation						$ 160
SCANA [Member]
Parent Company Only Financial Information [Line Items]
Gain loss on investments held in nuclear decommissioning trust funds							$ 150
Charge related to a voluntary retirement program after tax		$ 316
Charge Related To Litigation Acquired After Tax	$ 244	75	$ 134
Charge related to a contract termination after tax.		100
Charge For Refunds Collected From Customers			756
After tax charge for decommissioning costs			197
After tax charge for closure costs			84
Merger and integration-related costs			1,300				484
Virginia Electric and Power Company
Parent Company Only Financial Information [Line Items]
After-taxcharge associated with Virginia legislation						$ 160
Gain loss on contract termination		100
Voluntary retirement expenses after tax		144
Project abandonement costs after tax		47
After tax charge for charge for the planned early retirement	409
After tax charge for closure costs	84
Virginia Electric and Power Company | SCANA [Member]
Parent Company Only Financial Information [Line Items]
After tax charge for charge for the planned early retirement			409
Dominion Energy Gas Holdings, LLC
Parent Company Only Financial Information [Line Items]
After-tax gains from the sale of certain merchant generation facilities	$ 165
After-tax charge for disallowance of FERC-regulated plant		89
Voluntary retirement expenses after tax		58
Merger and integration-related costs							$ 603	$ 230	$ 239
Dominion Energy Gas Holdings, LLC | Discontinued Operations
Parent Company Only Financial Information [Line Items]
Voluntary retirement expenses after tax		$ 32
Dominion Energy Gas Holdings, LLC | SCANA [Member]
Parent Company Only Financial Information [Line Items]
After tax charge for regulatory assets			$ 277