Virginia Electric & Power 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	VA
Entity Registrant Name	DOMINION ENERGY, INC.
Entity Central Index Key	0000715957
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		809,908,408
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-08489
Entity Tax Identification Number	54-1229715
Entity Address, Address Line One	120 Tredegar Street
Entity Address, City or Town	Richmond
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23219
City Area Code	804
Local Phone Number	819-2000
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	D
Security Exchange Name	NYSE
2019 Series A Corporate Units
Document Information [Line Items]
Title of 12(b) Security	2019 Series A Corporate Units
Trading Symbol	DCUE
Security Exchange Name	NYSE
Virginia Electric and Power Company
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	VA
Entity Registrant Name	VIRGINIA ELECTRIC AND POWER COMPANY
Entity Central Index Key	0000103682
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		274,723
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	000-55337
Entity Tax Identification Number	54-0418825
Entity Address, Address Line One	120 Tredegar Street
Entity Address, City or Town	Richmond
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23219
City Area Code	804
Local Phone Number	819-2000

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenue		$ 3,176	$ 3,607	$ 10,084	$ 10,651
Operating Expenses
Electric fuel and other energy-related purchases		703	594	1,740	1,758
Purchased (excess) electric capacity		26	23	62	36
Purchased gas		60	37	665	561
Other operations and maintenance		924	977	2,806	2,720
Depreciation, depletion and amortization		621	595	1,833	1,751
Other taxes		223	203	702	663
Impairment of assets and other charges (benefits)		(222)	1,151	194	1,963
Total operating expenses		2,335	3,580	8,002	9,452
Income from operations		841	27	2,082	1,199
Earnings (loss) from equity method investees		69	(5)	214	0
Other income		133	286	732	327
Interest and related charges		407	306	978	1,136
Income from continuing operations including noncontrolling interests before income tax expense (benefit)		636	2	2,050	390
Income tax expense (benefit)		35	(110)	200	(123)
Net Income From Continuing Operations Including Noncontrolling Interests		601	112	1,850	513
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests	[1],[2]	65	19	119	(1,753)
Net Income (Loss) Including Noncontrolling Interests		666	131	1,969	(1,240)
Noncontrolling Interests		12	(225)	22	(157)
Net Income (Loss)		654	356	1,947	(1,083)
Amounts attributable to Dominion Energy
Net income from continuing operations		589	369	1,828	767
Net income (loss) from discontinued operations		$ 65	$ (13)	$ 119	$ (1,850)
EPS - Basic
Net income from continuing operations		$ 0.71	$ 0.42	$ 2.20	$ 0.86
Net income (loss) from discontinued operations		0.08	(0.01)	0.15	(2.21)
Net income (loss) attributable to Dominion Energy		0.79	0.41	2.35	(1.35)
EPS - Diluted
Net income from continuing operations		0.71	0.42	2.20	0.83
Net income (loss) from discontinued operations		0.08	(0.01)	0.15	(2.21)
Net income (loss) attributable to Dominion Energy		$ 0.79	$ 0.41	$ 2.35	$ (1.38)
Virginia Electric and Power Company
Operating Revenue	[3]	$ 1,976	$ 2,248	$ 5,547	$ 5,983
Operating Expenses
Electric fuel and other energy-related purchases	[3]	515	424	1,270	1,282
Purchased (excess) electric capacity		15	3	16	(14)
Affiliated suppliers		77	69	242	236
Other operations and maintenance		393	456	1,140	1,083
Depreciation, depletion and amortization		343	324	990	942
Other taxes		86	85	262	257
Impairment of assets and other charges (benefits)		(230)	200	(269)	1,008
Total operating expenses		1,199	1,561	3,651	4,794
Income from operations		777	687	1,896	1,189
Other income		21	34	93	34
Interest and related charges	[3]	136	135	400	398
Income before income tax expense		662	586	1,589	825
Income tax expense (benefit)		106	111	245	140
Net Income (Loss)		$ 556	$ 475	$ 1,344	$ 685
[1]	Includes income tax expense (benefit) of $(6) million and $(10) million for the three months ended September 30, 2021 and 2020, respectively, and $5 million and $(572) million for the nine months ended September 30, 2021 and 2020, respectively.
[2]	See Note 10 for amounts attributable to related parties.
[3]	See Note 19 for amounts attributable to affiliates.

Consolidated Statements of In_2

Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Income tax expense (benefit) from discontinued operations	$ (6)	$ (10)	$ 5	$ (572)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss) including noncontrolling interests		$ 666	$ 131	$ 1,969	$ (1,240)
Net income		654	356	1,947	(1,083)
Other comprehensive income (loss), net of taxes:
Net deferred gains (losses) on derivatives-hedging activities	[1]	(2)	10	21	(254)
Changes in unrealized net gains (losses) on investment securities	[2]	4	4	(15)	32
Changes in net unrecognized pension and other postretirement benefit costs	[3]	(1)	(261)	5	(262)
Amounts reclassified to net income (loss):
Net derivative (gains) losses-hedging activities	[4]	10	188	35	215
Net realized (gains) losses on investment securities	[5]	(3)	(1)	(5)	(15)
Net pension and other postretirement benefit costs	[6]	19	23	63	60
Changes in other comprehensive income from equity method investees	[7]	(3)	1	(3)	1
Total other comprehensive income (loss)		24	(36)	101	(223)
Comprehensive income (loss) including noncontrolling interests		690	95	2,070	(1,463)
Comprehensive income (loss) attributable to noncontrolling interests		12	(225)	22	(157)
Comprehensive income (loss) attributable to Dominion Energy		678	320	2,048	(1,306)
Virginia Electric and Power Company
Net income		556	475	1,344	685
Other comprehensive income (loss), net of taxes:
Net deferred gains (losses) on derivatives-hedging activities	[8]	(2)	5	18	(39)
Changes in unrealized net gains (losses) on investment securities	[9]			(2)	4
Amounts reclassified to net income (loss):
Net derivative (gains) losses-hedging activities	[10]		1	1	1
Net realized (gains) losses on investment securities	[11]	(1)	(1)	(1)	(2)
Total other comprehensive income (loss)		(3)	5	16	(36)
Comprehensive income (loss) attributable to Dominion Energy		$ 553	$ 480	$ 1,360	$ 649
[1]	Net of $— million and $(4) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(8) million and $85 million tax for nine months ended September 30, 2021 and 2020, respectively.
[2]	Net of $— million and $(2) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $8 million and $(12) million tax for the nine months ended September 30, 2021 and 2020, respectively.
[3]	Net of $(1) million and $91 million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(8) million and $94 million tax for the nine months ended September 30, 2021 and 2020, respectively .
[4]	Net of $(4) million and $(63) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(12) million and $(72) million tax for the nine months ended September 30, 2021 and 2020, respectively.
[5]	Net of $1 million and $2 million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $2 million and $6 million tax for the nine months ended September 30, 2021 and 2020, respectively.
[6]	Net of $(6) million and $(8) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(22) million and $(21) million tax for the nine months ended September 30, 2021 and 2020, respectively.
[7]	Net of $1 million and $(1) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $1 million and $(1) million tax for the nine months ended September 30, 2021 and 2020, respectively.
[8]	Net of $— million and $(1) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(6) million and $14 million tax for the nine months ended September 30, 2021 and 2020, respectively.
[9]	Net of $— million and $(1) million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $—
[10]	Net of $(1) million and $— million tax for the three months ended September 30, 2021 and 2020, respectively, and net of $(1)
[11]	Net of $— million and $— million tax for the three months ended September 30, 2021 and 2020, respectively and net of $— million and $1

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net deferred gain (losses) on derivative-hedging activities, tax		$ (4)	$ (8)	$ 85
Changes in unrealized net gains (losses) on investment securities, tax		(2)	8	(12)
Changes in net unrecognized pension and other postretirement benefit costs, tax	$ (1)	91	(8)	94
Net derivative (gains) losses-hedging activities, tax	(4)	(63)	(12)	(72)
Net realized (gains) losses on investment securities, tax	1	2	2	6
Net pension and other postretirement benefit costs, tax	(6)	(8)	(22)	(21)
Changes in other comprehensive income from equity method investees, tax	1	(1)	1	(1)
Virginia Electric and Power Company
Net deferred gain (losses) on derivative-hedging activities, tax		(1)	(6)	14
Changes in unrealized net gains (losses) on investment securities, tax		$ (1)		(2)
Net derivative (gains) losses-hedging activities, tax	$ (1)		$ (1)	(1)
Net realized (gains) losses on investment securities, tax				$ 1

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents		$ 180	$ 172	[1]
Customer receivables (less allowance for doubtful accounts)		1,853	2,295	[1]
Other receivables (less allowance for doubtful accounts)		206	212	[1]
Inventories		1,593	1,550	[1]
Margin deposit assets		553	19	[1]
Prepayments		426	309	[1]
Regulatory assets		1,193	699	[1]
Other		255	148	[1]
Current assets held for sale		3,039	1,482	[1]
Total current assets		9,298	6,886	[1]
Investments
Nuclear decommissioning trust funds		7,506	6,900	[1]
Investment in equity method affiliates		2,920	2,934	[1]
Other		391	404	[1]
Total investments		10,817	10,238	[1]
Property, Plant and Equipment
Property, plant and equipment		84,738	82,959	[1]
Accumulated depreciation, depletion and amortization		(26,352)	(25,111)	[1]
Total property, plant and equipment, net		58,386	57,848	[1]
Deferred Charges and Other Assets
Goodwill		7,405	7,381	[1]
Regulatory assets		9,213	9,133	[1]
Other		4,685	4,419	[1]
Total deferred charges and other assets		21,303	20,933	[1]
Total assets		99,804	95,905	[1]
Current Liabilities
Securities due within one year		2,845	1,937	[1]
Supplemental 364-Day credit facility borrowings	[1]		225
Short-term debt		3,885	895	[1]
Accounts payable		851	944	[1]
Accrued interest, payroll and taxes		1,185	1,133	[1]
Derivative liabilities		729	412	[1]
Regulatory liabilities		1,059	809	[1]
Liability to Atlantic Coast Pipeline		112	1,052	[1]
Q-Pipe Transaction deposit	[1]		1,290
Other	[2]	1,507	1,521	[1]
Current liabilities held for sale		1,050	625	[1]
Total current liabilities		13,223	10,843	[1]
Long-Term Debt
Long-term debt		31,641	30,915	[1]
Junior subordinated notes		1,385	2,161	[1]
Supplemental credit facility borrowings		900
Other		849	881	[1]
Total long-term debt		34,775	33,957	[1]
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		6,313	5,953	[1]
Regulatory liabilities		10,346	10,187	[1]
Other		7,915	8,504	[1]
Total deferred credits and other liabilities		24,574	24,644	[1]
Total liabilities		72,572	69,444	[1]
Commitments and Contingencies (see Note 17)				[1]
Equity
Preferred stock (see Note 16)		2,387	2,387	[1]
Common stock - no par	[3]	21,573	21,258	[1]
Retained earnings		4,562	4,189	[1]
Accumulated other comprehensive income (loss)		(1,616)	(1,717)	[1]
Total shareholders' equity		26,906	26,117	[1]
Noncontrolling interests		326	344	[1]
Total equity		27,232	26,461	[1]
Total liabilities and equity		99,804	95,905	[1]
Virginia Electric and Power Company
Current Assets
Cash and cash equivalents		38	35	[4]
Customer receivables (less allowance for doubtful accounts)		1,207	1,315	[4]
Other receivables (less allowance for doubtful accounts)		58	91	[4]
Affiliated receivables		2	5	[4]
Inventories		826	862	[4]
Regulatory assets		690	295	[4]
Other	[5]	280	59	[4]
Total current assets		3,101	2,662	[4]
Investments
Nuclear decommissioning trust funds		3,507	3,197	[4]
Other		4	3	[4]
Total investments		3,511	3,200	[4]
Property, Plant and Equipment
Property, plant and equipment		48,795	46,736	[4]
Accumulated depreciation, depletion and amortization		(14,919)	(14,167)	[4]
Total property, plant and equipment, net		33,876	32,569	[4]
Deferred Charges and Other Assets
Regulatory assets		3,941	3,509	[4]
Other	[5]	1,974	1,714	[4]
Total deferred charges and other assets		5,915	5,223	[4]
Total assets		46,403	43,654	[4]
Current Liabilities
Securities due within one year		761	8	[4]
Short-term debt		896	45	[4]
Accounts payable		393	332	[4]
Payables to affiliates		139	266	[4]
Affiliated current borrowings		310	380	[4]
Accrued interest, payroll and taxes		374	253	[4]
Derivative liabilities	[5]	389	390	[4]
Regulatory liabilities		685	425	[4]
Other		703	728	[4]
Total current liabilities		4,650	2,827	[4]
Long-Term Debt
Long-term debt		12,462	13,207	[4]
Other		495	480	[4]
Total long-term debt		12,957	13,687	[4]
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		3,028	2,779	[4]
Asset Retirement Obligations Noncurrent		3,699	3,654	[4]
Regulatory liabilities		5,560	5,338	[4]
Other	[5]	892	812	[4]
Total deferred credits and other liabilities		13,179	12,583	[4]
Total liabilities		30,786	29,097	[4]
Commitments and Contingencies (see Note 17)				[4]
Equity
Common stock - no par	[6]	5,738	5,738	[4]
Other paid-in capital		1,113	1,113	[4]
Retained earnings		8,802	7,758	[4]
Accumulated other comprehensive income (loss)		(36)	(52)	[4]
Total shareholders' equity		15,617	14,557	[4]
Total liabilities and equity		$ 46,403	$ 43,654	[4]
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	See Note 10 for amounts attributable to related parties.
[3]	1.8 billion shares authorized; 810 million and 806 million shares outstanding at September 30, 2021 and December 31, 2020, respectively.
[4]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[5]	See Note 19 for amounts attributable to affiliates.
[6]	500,000 shares authorized; 274,723 shares

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Customer receivables, allowance for doubtful accounts	$ 47	$ 42	[1]
Other receivables, allowance for doubtful accounts	$ 4	$ 3	[1]
Common stock, shares authorized	1,800,000,000	1,800,000,000	[1]
Common stock, shares outstanding	810,000,000	806,000,000	[1]
Virginia Electric and Power Company
Customer receivables, allowance for doubtful accounts	$ 32	$ 23	[2]
Other receivables, allowance for doubtful accounts	$ 2	$ 2	[2]
Common stock, shares authorized	500,000	500,000
Common stock, shares outstanding	274,723	274,723
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total		Cumulative-effect of Changes in Accounting Principles	Preferred Stock	Common Stock	Retained Earnings	Retained EarningsCumulative-effect of Changes in Accounting Principles	AOCI	Total Shareholders' Equity	Total Shareholders' EquityCumulative-effect of Changes in Accounting Principles	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 34,033		$ (48)	$ 2,387	$ 23,824	$ 7,576	$ (48)	$ (1,793)	$ 31,994	$ (48)	$ 2,039
Beginning balance (in shares) at Dec. 31, 2019				2,000,000	838,000,000
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Net income (loss) including noncontrolling interests	$ (1,240)					(1,083)			(1,083)		(157)
Issuance of stock	481				$ 481				481
Issuance of stock (in shares)					6,000,000
Stock repurchases	(2,385)				$ (2,385)				(2,385)
Stock repurchases (in shares)					(28,000,000)
Stock awards (net of change in unearned compensation)	22				$ 22				22
Preferred stock dividends (see Note 16)	(48)					(48)			(48)
Common stock dividends and distributions	(2,515)					(2,362)			(2,362)		(153)
Other comprehensive income (loss), net of tax	(223)							(223)	(223)
Other	(11)				(12)				(12)		1
Ending balance at Sep. 30, 2020	28,066			$ 2,387	$ 21,930	4,035		(2,016)	26,336		1,730
Ending balance (in shares) at Sep. 30, 2020				2,000,000	816,000,000
Beginning balance at Jun. 30, 2020	30,884			$ 2,387	$ 23,984	4,480		(1,980)	28,871		2,013
Beginning balance (in shares) at Jun. 30, 2020				2,000,000	840,000,000
Net income (loss) including noncontrolling interests	131					356			356		(225)
Issuance of stock	333				$ 333				333
Issuance of stock (in shares)					4,000,000
Stock repurchases	(2,385)				$ (2,385)				(2,385)
Stock repurchases (in shares)					(28,000,000)
Stock awards (net of change in unearned compensation)	9				$ 9				9
Preferred stock dividends (see Note 16)	(16)					(16)			(16)
Common stock dividends and distributions	(844)					(785)			(785)		(59)
Other comprehensive income (loss), net of tax	(36)							(36)	(36)
Other	(10)				(11)				(11)		1
Ending balance at Sep. 30, 2020	28,066			$ 2,387	$ 21,930	4,035		(2,016)	26,336		1,730
Ending balance (in shares) at Sep. 30, 2020				2,000,000	816,000,000
Beginning balance at Dec. 31, 2020	26,461	[1]		$ 2,387	$ 21,258	4,189		(1,717)	26,117		344
Beginning balance (in shares) at Dec. 31, 2020				2,000,000	806,000,000
Net income (loss) including noncontrolling interests	1,969					1,947			1,947		22
Issuance of stock	292				$ 292				292
Issuance of stock (in shares)					4,000,000
Stock repurchases (in shares)					0
Stock awards (net of change in unearned compensation)	24				$ 24				24
Preferred stock dividends (see Note 16)	(48)					(48)			(48)
Common stock dividends and distributions	(1,566)					(1,526)			(1,526)		(40)
Other comprehensive income (loss), net of tax	101							101	101
Other	(1)				(1)				(1)
Ending balance at Sep. 30, 2021	27,232			$ 2,387	$ 21,573	4,562		(1,616)	26,906		326
Ending balance (in shares) at Sep. 30, 2021				2,000,000	810,000,000
Beginning balance at Jun. 30, 2021	26,884			$ 2,387	$ 21,369	4,434		(1,640)	26,550		334
Beginning balance (in shares) at Jun. 30, 2021				2,000,000	807,000,000
Net income (loss) including noncontrolling interests	666					654			654		12
Issuance of stock	195				$ 195				195
Issuance of stock (in shares)					3,000,000
Stock awards (net of change in unearned compensation)	9				$ 9				9
Preferred stock dividends (see Note 16)	(16)					(16)			(16)
Common stock dividends and distributions	(529)					(510)			(510)		(19)
Other comprehensive income (loss), net of tax	24							24	24
Other	(1)										(1)
Ending balance at Sep. 30, 2021	$ 27,232			$ 2,387	$ 21,573	$ 4,562		$ (1,616)	$ 26,906		$ 326
Ending balance (in shares) at Sep. 30, 2021				2,000,000	810,000,000
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Stockholders Equity [Abstract]
Dividends declared per common share	$ 0.630	$ 0.940	$ 1.890	$ 2.820

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net income (loss) including noncontrolling interests	$ 1,969	$ (1,240)
Net income	1,947	(1,083)
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	2,058	2,178
Deferred income taxes and investment tax credits	199	(380)
Provision for refunds to electric utility customers	350
Impairment of assets and other charges (benefits)	194	2,207
Loss from investment in Atlantic Coast Pipeline	19	2,376
Net gains on nuclear decommissioning trust funds and other investments	(370)	(101)
Other adjustments	254	138
Changes in:
Accounts receivable	207	237
Inventories	(45)	29
Deferred fuel and purchased gas costs, net	(531)	206
Prepayments	(121)	(292)
Accounts payable	(29)	(186)
Accrued interest, payroll and taxes	51	(113)
Customer deposits	(19)	(9)
Margin deposit assets and liabilities	(539)	3
Net realized and unrealized changes related to derivative activities	432	285
Pension and other postretirement benefits	(103)	(170)
Other operating assets and liabilities	(441)	(358)
Net cash provided by operating activities	3,535	4,810
Investing Activities
Plant construction and other property additions (including nuclear fuel)	(4,142)	(4,409)
Acquisition of solar development projects	(87)	(245)
Proceeds from sales of securities	3,324	2,868
Purchases of securities	(3,288)	(2,948)
Repayment of Q-Pipe Transaction deposit	(1,265)
Contributions to equity method affiliates	(1,006)	(92)
Acquisition of equity method investments		(178)
Other	(143)	144
Net cash used in investing activities	(6,607)	(4,860)
Financing Activities
Issuance of short-term debt, net	2,990	1,417
Issuance of short-term notes	1,265	1,125
Repayment of short-term notes		(625)
Supplemental 364-Day credit facility borrowings		225
Repayment of supplemental 364-day credit facility borrowings	(225)
Issuance of long-term debt	2,500	5,677
Repayment of long-term debt	(2,708)	(2,546)
Supplemental credit facility borrowings	900
Issuance of common stock	144	159
Repurchase of common stock		(2,385)
Common dividend payments	(1,526)	(2,362)
Other	(248)	(346)
Net cash provided by (used in) financing activities	3,092	339
Increase in cash, restricted cash and equivalents	20	289
Cash, restricted cash and equivalents at beginning of period	247	269
Cash, restricted cash and equivalents at end of period	267	558
Virginia Electric and Power Company
Operating Activities
Net income	1,344	685
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	1,109	1,068
Deferred income taxes and investment tax credits	198	(259)
Impairment of assets and other charges (benefits)	(269)	1,004
Provision for refunds to customers	350
Other adjustments	81	11
Changes in:
Accounts receivable	(98)	(186)
Affiliated receivables and payables	(123)	144
Inventories	36	46
Deferred fuel and purchased gas costs, net	(396)	144
Prepayments	(5)	1
Accounts payable	66	(1)
Accrued interest, payroll and taxes	121	81
Margin deposit assets and liabilities	(121)
Net realized and unrealized changes related to derivative activities	8	(18)
Asset retirement obligations	16	51
Pension and other postretirement benefits	6	(273)
Other operating assets and liabilities	(83)	67
Net cash provided by operating activities	2,240	2,565
Investing Activities
Plant construction and other property additions	(2,525)	(2,301)
Purchases of nuclear fuel	(73)	(170)
Acquisition of solar development projects	(61)	(26)
Proceeds from sales of securities	1,465	694
Purchases of securities	(1,470)	(729)
Other	(45)	33
Net cash used in investing activities	(2,709)	(2,499)
Financing Activities
Issuance of short-term debt, net	851	179
Issuance (repayment) of affiliated current borrowings, net	(70)	123
Issuance of long-term debt		427
Repayment of long-term debt		(427)
Common dividend payments	(300)	(323)
Other	(8)	(6)
Net cash provided by (used in) financing activities	473	(27)
Increase in cash, restricted cash and equivalents	4	39
Cash, restricted cash and equivalents at beginning of period	35	24
Cash, restricted cash and equivalents at end of period	$ 39	$ 63

Virginia Electric and Power Com

Virginia Electric and Power Company Consolidated Statements of Common Shareholder's Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total		Common Stock	AOCI	Virginia Electric and Power Company		Virginia Electric and Power CompanyCommon Stock	Virginia Electric and Power CompanyOther Paid-In Capital	Virginia Electric and Power CompanyRetained Earnings	Virginia Electric and Power CompanyAOCI
Beginning balance at Dec. 31, 2019				$ (1,793)	$ 13,989		$ 5,738	$ 1,113	$ 7,167	$ (29)
Beginning balance (in shares) at Dec. 31, 2019			838,000				275
Net income (loss)	$ (1,083)				685				685
Dividends					(323)				(323)
Other comprehensive income (loss), net of tax	(223)			(223)	(36)					(36)
Other	(11)		$ (12)
Ending balance at Sep. 30, 2020				(2,016)	14,315		$ 5,738	1,113	7,529	(65)
Ending balance (in shares) at Sep. 30, 2020			816,000				275
Beginning balance at Jun. 30, 2020				(1,980)	13,944		$ 5,738	1,113	7,163	(70)
Beginning balance (in shares) at Jun. 30, 2020			840,000				275
Net income (loss)	356				475				475
Dividends					(108)				(108)
Other comprehensive income (loss), net of tax	(36)			(36)	5					5
Other	(10)		$ (11)		(1)				(1)
Ending balance at Sep. 30, 2020				(2,016)	14,315		$ 5,738	1,113	7,529	(65)
Ending balance (in shares) at Sep. 30, 2020			816,000				275
Beginning balance at Dec. 31, 2020	26,117	[1]		(1,717)	14,557	[2]	$ 5,738	1,113	7,758	(52)
Beginning balance (in shares) at Dec. 31, 2020			806,000				275
Net income (loss)	1,947				1,344				1,344
Dividends					(300)				(300)
Other comprehensive income (loss), net of tax	101			101	16					16
Other	(1)		$ (1)
Ending balance at Sep. 30, 2021	26,906			(1,616)	15,617		$ 5,738	1,113	8,802	(36)
Ending balance (in shares) at Sep. 30, 2021			810,000				275
Beginning balance at Jun. 30, 2021				(1,640)	15,064		$ 5,738	1,113	8,246	(33)
Beginning balance (in shares) at Jun. 30, 2021			807,000				275
Net income (loss)	654				556				556
Other comprehensive income (loss), net of tax	24			24	(3)					(3)
Other	(1)
Ending balance at Sep. 30, 2021	$ 26,906			$ (1,616)	$ 15,617		$ 5,738	$ 1,113	$ 8,802	$ (36)
Ending balance (in shares) at Sep. 30, 2021			810,000				275
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Nature of Operations

Nature of Operations	9 Months Ended
	Sep. 30, 2021
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 distributors of energy. Dominion Energy’s operations are conducted through various subsidiaries, including Virginia Power. Dominion Energy’s operations also include DESC, regulated gas distribution operations primarily in the eastern and Rocky Mountain regions of the U.S., nonregulated electric generation and, following completion of the GT&S Transaction in November 2020, a noncontrolling interest in Cove Point. See Note 3 for a description of the sale of substantially all of Dominion Energy’s gas transmission and storage operations to BHE through the GT&S Transaction completed in November 2020 and the expected sale of Dominion Energy’s remaining regulated gas transmission and storage services in the Rocky Mountain region of the U.S. to Southwest Gas.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Significant Accounting Policies	Note 2. Significant Accounting Policies As permitted by the rules and regulations of the SEC, the Companies’ accompanying unaudited Consolidated Financial Statements contain certain condensed financial information and exclude certain footnote disclosures normally included in annual audited consolidated financial statements prepared in accordance with GAAP. These unaudited Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. In the Companies’ opinion, the accompanying unaudited Consolidated Financial Statements contain all adjustments necessary to present fairly their financial position at September 30, 2021, their results of operations and changes in equity for the three and nine months ended September 30, 2021 and 2020 and their cash flows for the nine months ended September 30, 2021 and 2020. Such adjustments are normal and recurring in nature unless otherwise noted. 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 and expenses for the periods presented. Actual results may differ from those estimates. The Companies’ accompanying unaudited Consolidated Financial Statements include, after eliminating intercompany transactions and balances, their accounts, those of their respective majority-owned subsidiaries and non-wholly-owned entities in which they have a controlling financial interest. For certain partnership structures, income is allocated based on the liquidation value of the underlying contractual arrangements. At September 30, 2021, 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. Clearway’s ownership interest in Four Brothers and Three Cedars, Terra Nova Renewable Partners’ 33% interest in certain Dominion Energy nonregulated solar projects and Brookfield’s 25% interest in Cove Point (effective December 2019 until November 2020) are reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements. In August 2021, Dominion Energy entered into an agreement with Terra Nova Renewable Partners to sell its remaining controlling financial interest in certain nonregulated solar projects. Also in August 2021, Dominion Energy entered into an agreement with Clearway to sell its 50% voting interest in Four Brothers and Three Cedars. See Note 11 for more information. The results of operations for interim periods are not necessarily indicative of the results expected for the full year. Information for quarterly periods is affected by seasonal variations in sales, rate changes, electric fuel and other energy-related purchases, purchased gas expenses and other factors. Certain amounts in the Companies’ 2020 Consolidated Financial Statements and Notes have been reclassified to conform to the 2021 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows. Effective in the second quarter of 2021, the Companies updated their Statements of Cash Flows to present net charges for allowance for credit risk and write-offs of accounts receivables within other adjustments to reconcile net income to net cash provided by operating activities from the previous presentation within changes in accounts receivable. All prior period information has been conformed to this presentation, which does not result in a change to net cash provided by operating activities. Amounts disclosed for Dominion Energy are inclusive of Virginia Power, where applicable. There have been no significant changes from Note 2 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020, with the exception of the items described below. Cash, Restricted Cash and Equivalents 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 nine months ended September 30, 2021 and 2020: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period September 30, 2021 September 30, 2020 December 31, 2020 December 31, 2019 (millions) Dominion Energy Cash and cash equivalents (1) $ 195 $ 462 $ 179 $ 166 Restricted cash and equivalents (2)(3) 72 96 68 103 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 267 $ 558 $ 247 $ 269 Virginia Power Cash and cash equivalents $ 38 $ 62 $ 35 $ 17 Restricted cash and equivalents (3) 1 1 — 7 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $ 63 $ 35 $ 24 (1) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $15 million, $49 million, $7 million and $31 million of cash and cash equivalents included in current assets held for sale, respectively. (2) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $22 million, $16 million, $3 million and $12 million of restricted cash and equivalents included in current assets held for sale, respectively (3) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. Supplemental Cash Flow Information The following table provides supplemental disclosure of cash flow information related to Dominion Energy: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 374 $ 461 Accrued contributions to equity method affiliates — 15 Leases (2) 75 45 (1) See Notes 16 and 17 for noncash financing activities related to derivative restructuring and the issuance of stock associated with the settlement of litigation and noncash investing activities related to property, plant and equipment conveyed to satisfy litigation, respectively. (2) Includes $34 million and $42 million of financing leases at September 30, 2021 and 2020, respectively, and $41 million and $3 million of operating leases at September 30, 2021 and 2020, respectively. The following table provides supplemental disclosure of cash flow information related to Virginia Power: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 238 $ 234 Leases ( 2 ) 59 26 (1) See Note 16 for noncash financing activities related to derivative restructuring. (2) Includes $24 million and $26 million of financing leases at September 30, 2021 and 2020, respectively, and $35 million of operating leases at September 30, 2021. Property, Plant and Equipment In March 2020, Virginia Power committed to retire certain coal- and oil-fired generating units before the end of their useful lives based on economic and other factors, including but not limited to market power prices and the VCEA. These units will be retired after they meet their capacity obligations to PJM in 2023. In the second quarter of 2020, Virginia Power recorded charges of $30 million ($22 million after-tax) associated with dismantling certain of these electric generation facilities, recorded in impairment of assets and other charges in its Consolidated Statements of Income. Asset Retirement Obligations In the second quarter of 2021, Dominion Energy revised its estimated cash flow projections associated with the recovery of spent nuclear fuel costs for its AROs associated with the decommissioning of Kewaunee. As a result, Dominion Energy recorded a charge of $44 million ($35 million after-tax) within other operations and maintenance expense in its Consolidated Statements of Income. In the third quarter of 2021, Dominion Energy revised its estimated cash flow projections associated with certain gas distribution pipeline AROs. As a result, Dominion Energy recorded a $252 million decrease to AROs with a corresponding $173 million decrease to property, plant and equipment, net and the remainder primarily recorded as an increase to regulatory liabilities.

Acquisitions and Dispositions

Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2021
Text Block [Abstract]
Acquisitions and Dispositions	Note 3. Acquisitions and Dispositions Disposition of Gas Transmission & Storage Operations In July 2020, Dominion Energy entered into an agreement with BHE with a total value of approximately $10 billion, comprised of approximately $4.0 billion of cash consideration (subject to customary closing adjustments) plus the assumption of long-term debt, to sell substantially all of its gas transmission and storage operations, including processing assets, as well as noncontrolling partnership interests in Iroquois, JAX LNG and White River Hub and a controlling interest in Cove Point (consisting of 100% of the general partner interest and 25% of the total limited partner interests). The agreement provides that Dominion Energy retains the assets and obligations of the pension and other postretirement employee benefit plans associated with the operations included in the transaction and relating to services provided through closing. In October 2020, pursuant to a provision in the agreement with BHE, Dominion Energy elected to exclude the Q-Pipe Group from the transaction as approval under the Hart-Scott-Rodino Act had not been obtained by mid-September 2020. Concurrently in October 2020, Dominion Energy and BHE entered into a separate agreement under which Dominion Energy would sell the Q-Pipe Group for cash consideration of $1.3 billion and the assumption of related long-term debt. In November 2020, Dominion Energy completed the GT&S Transaction as discussed in Note 3 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In connection with closing of the GT&S Transaction, Dominion Energy and BHE entered into a transition services agreement under which Dominion Energy will continue to provide specified administrative services to support the operations of the disposed business for up to 24 months after closing, subsequently extended through June 2023 for certain services. In addition, BHE will provide certain administrative services to Dominion Energy. Dominion Energy recorded revenue of $5 million and $16 million associated with the transition service agreement in operating revenue in its Consolidated Statements of Income for the three and nine months ended September 30, 2021, respectively. Also in November 2020, BHE provided a $1.3 billion deposit to Dominion Energy on the Q-Pipe Transaction. In July 2021, Dominion Energy and BHE mutually agreed to terminate the Q-Pipe Transaction as a result of ongoing uncertainty associated with receiving approval under the Hart-Scott-Rodino Act. Dominion Energy simultaneously announced its intention to pursue the divestiture of the Q-Pipe Group to an alternative buyer via competitive sales process with targeted closing, subject to applicable regulatory approval, by the end of 2021. Also in July 2021, Dominion Energy entered into an approximately $1.3 billion term loan credit agreement and borrowed the full amount available thereunder. The agreement matures in December 2021, which can be extended at Dominion Energy’s option to June 2022, and bears interest at a variable rate. The proceeds were utilized to repay the deposit received from BHE on the Q-Pipe Transaction. Upon completion of a sale of the Q-Pipe Group, Dominion Energy is required to utilize the net proceeds to repay any outstanding balances under the term loan agreement. In October 2021, Dominion Energy entered into an agreement with Southwest Gas to sell the Q-Pipe Group. The total value of this transaction is approximately $2 billion, comprised of approximately $1.5 billion of cash consideration (subject to customary closing adjustments) plus the assumption of long-term debt. The agreement provides that Dominion Energy retains the assets and obligations of the pension and other postretirement employee benefit plans associated with the operations included in the transaction and relating to services provided through closing. The sale will be treated as an asset sale for tax purposes and is expected to close by the end of 2021, contingent on clearance or approval under the Hart-Scott-Rodino Act and other customary closing and regulatory conditions. Based on the recorded balances at September 30, 2021, Dominion Energy expects to recognize a gain of approximately $685 million ($500 million after-tax) upon closing, including the write-off of $191 million of goodwill, but excluding the effects of any closing adjustments. The operations included in both the GT&S Transaction and the Q-Pipe Group are presented in held for sale and discontinued operations effective July 2020, at which time depreciation and amortization ceased on the applicable assets. As Cove Point had previously been consolidated within Dominion Energy’s financial statements, balances associated with Cove Point prior to the closing of the GT&S Transaction are presented within held-for-sale and discontinued operations. See Note 10 for further information regarding Dominion Energy’s equity method investment in Cove Point. The following table represents selected information regarding the results of operations, which are reported within discontinued operations in Dominion Energy’s Consolidated Statements of Income: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 Q-Pipe Group GT&S Transaction Q-Pipe Group Q-Pipe Group GT&S Transaction Q-Pipe Group (millions) Operating revenue $ 62 $ 511 $ 59 $ 188 $ 1,554 $ 182 Operating expense (1) 24 208 16 52 1,311 78 Other income (2) 26 (5 ) 1 27 27 3 Interest and related charges (3) 7 267 5 17 366 15 Income (loss) before income taxes 57 31 39 146 (96 ) 92 Income tax expense (benefit) (4) 12 (14 ) 5 29 (65 ) 19 Net income (loss) including noncontrolling interests 45 45 34 117 (31 ) 73 Noncontrolling interests — 32 — — 97 — Net income (loss) attributable to Dominion Energy $ 45 $ 13 $ 34 $ 117 $ (128 ) $ 73 (1) GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in the second quarter of 2020 associated with the probable abandonment of a significant portion of the Supply Header Project, as well as the establishment of a $75 million ARO as a result of the cancellation of the Atlantic Coast Pipeline Project (2) Q-Pipe Group includes a $25 million benefit associated with the termination of the Q-Pipe Transaction in the third quarter of 2021. (3) GT&S Transaction includes a loss of $237 million recorded in the third quarter of 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring (4) Excludes $18 million income tax benefit recorded in the third quarter of 2021 associated with the GT&S Transaction. The carrying amounts of major classes of assets and liabilities relating to the disposal groups, which are reported as held for sale in Dominion Energy’s Consolidated Balance Sheets were as follows: At September 30, 2021 At December 31, 2020 Q-Pipe Group Q-Pipe Group (millions) Current assets (1) $ 47 $ 47 Equity method investments (2) 35 35 Property, plant and equipment, net 1,142 1,113 Other deferred charges and other assets, including goodwill and intangible assets (3) 223 224 Current liabilities 35 30 Long-term debt 426 426 Other deferred credits and liabilities 154 154 (1) Includes cash and cash equivalents (2) Comprised of an equity method investment in White River Hub (3) Includes goodwill of $191 million at both September 30, 2021 and December 31, 2020. Capital expenditures and significant noncash items relating to the disposal groups included the following: Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 Q-Pipe Group GT&S Transaction Q-Pipe Group (millions) Capital expenditures $ 26 $ 240 $ 27 Significant noncash items: Impairment of assets and other charges — 463 — Depreciation, depletion and amortization — 173 25 Accrued capital expenditures 2 43 2 Sale of Kewaunee In May 2021, Dominion Energy entered into an agreement to sell 100% of the equity interests in Dominion Energy Kewaunee, Inc. to EnergySolutions, including the transfer of all decommissioning obligations associated with Kewaunee, which ceased operations in 2013. The agreement provides that Dominion Energy retains the assets and obligations of the pension and other postretirement employee benefit plans. In addition, Dominion Energy may continue to withdraw funds prior to closing from the nuclear decommissioning trust to recover certain spent nuclear fuel and other permitted costs, subject to certain conditions. The sale will be treated as an asset sale for tax purposes and is subject to termination by either party if not completed by December 2022. Closing is contingent on approval from the Wisconsin Commission as well as the NRC for the transfer of control of applicable licenses. The purchase agreement requires that EnergySolutions be subject to the Wisconsin regulatory conditions agreed to by Dominion Energy upon its acquisition of Kewaunee, including the return of any excess decommissioning funds to WPSC and WP&L customers following completion of all decommissioning activities. In May 2021, Dominion Energy and EnergySolutions submitted a license transfer application to the NRC. Also in May 2021, Dominion Energy submitted an application to the Wisconsin Commission for approval. In July 2021, WPSC and WP&L submitted a joint request to the Wisconsin Commission for the waiver of both of their rights of first refusal to purchase Kewaunee, such rights having been granted as the former owners of Kewaunee. At September 30, 2021, Dominion Energy determined that the assets and liabilities associated with the Kewaunee sale did not meet the criteria to be classified as held for sale due to the significant uncertainty surrounding the timing of or ability to obtain necessary regulatory approvals. Dominion Energy expects to record a loss if and when it determines that criteria for the classification as held for sale have been met. If such classification had been made at September 30, 2021, Dominion Energy would have recognized a loss of approximately $710 million ($565 million after-tax). If the sale is ultimately completed, the final net loss will primarily depend on the value of the nuclear decommissioning trust and AROs at closing. Acquisition of Birdseye In May 2021, Dominion Energy acquired 100% of the ownership interest in Birdseye from BRE Holdings, LLC for total consideration of $46 million, consisting of $28 million in cash and $18 million, measured at fair value at closing, of consideration contingent on the achievement of certain revenue targets and future development project sales. Birdseye is primarily engaged in the development of solar energy projects in southeastern states in the U.S. with 2.5 GW of solar generation projects under development. The allocation of the purchase price resulted in $25 million of development project assets, primarily reflected in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets, and $24 million of goodwill, which is not deductible for tax purposes. The goodwill reflects the value associated with enhancing Dominion Energy's development of regulated and long-term contracted solar generating and electric storage projects. The fair value measurements, including of the assets acquired, were determined using the income approach and 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. Birdseye is included in Contracted Assets.

Operating Revenue

Operating Revenue	9 Months Ended
	Sep. 30, 2021
Text Block [Abstract]
Operating Revenue	Note 4. Operating Revenue The Companies’ operating revenue consists of the following: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Dominion Energy Regulated electric sales: Residential $ 1,281 $ 1,497 $ 3,453 $ 3,746 Commercial 831 865 2,311 2,391 Industrial 194 190 547 548 Government and other retail 258 239 670 651 Wholesale 52 37 131 99 Nonregulated electric sales 253 218 719 627 Regulated gas sales: Residential 132 123 950 853 Commercial 61 50 346 304 Other 31 18 88 61 Nonregulated gas sales 7 12 74 124 Regulated gas transportation and storage 208 165 698 578 Other regulated revenues 47 61 187 236 Other nonregulated revenues (1) 79 61 184 132 Total operating revenue from contracts with customers 3,434 3,536 10,358 10,350 Other revenues (2)(3) (258 ) 71 (274 ) 301 Total operating revenue $ 3,176 $ 3,607 $ 10,084 $ 10,651 Virginia Power Regulated electric sales: Residential $ 935 $ 1,146 $ 2,572 $ 2,860 Commercial 604 645 1,715 1,805 Industrial 94 98 268 284 Government and other retail 241 223 625 603 Wholesale 31 25 79 70 Other regulated revenues 37 61 165 217 Other nonregulated revenues (1)(4) 45 33 93 66 Total operating revenue from contracts with customers 1,987 2,231 5,517 5,905 Other revenues (2)(4) (11 ) 17 30 78 Total operating revenue $ 1,976 $ 2,248 $ 5,547 $ 5,983 (1) Includes sales which are considered to be goods transferred at a point in time of $9 million and $5 million for the three months ended September 30, 2021 and 2020, respectively, and $24 million and $16 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy, primarily consisting of sales of commodities related to nonregulated extraction activities and other miscellaneous products. Additionally, sales of renewable energy credits were $16 million and $21 million for the three months ended September 30, 2021 and 2020, respectively, and $29 million and $32 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy and $13 million and $16 million for the three months ended September 30, 2021 and 2020, respectively, and $22 million and $24 million for the nine months ended September 30, 2021 and 2020, respectively, at Virginia Power. ( 2 ) I ( 3 ) (4) See Note 19 for amounts attributable to affiliates. 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 Dominion Energy expects to recognize this revenue. These revenues relate to contracts containing fixed prices where Dominion Energy will earn the associated revenue over time as it stands 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 Dominion Energy elects to recognize revenue in the amount it has a right to invoice. Revenue expected to be recognized on multi-year contracts in place at September 30, 2021 2021 2022 2023 2024 2025 Thereafter Total (millions) Dominion Energy (1) $ 17 $ 68 $ 66 $ 59 $ 51 $ 493 $ 754 (1) Includes no amounts for Virginia Power. At September 30, 2021 and December 31, 2020, Dominion Energy’s contract liability balances were $124 million and $130 million, respectively, and are recorded in other current liabilities and other deferred credits and other liabilities in the Consolidated Balance Sheets. At September 30, 2021 and December 31, 2020, Virginia Power’s contract liability balances were $29 million and $36 million, respectively, and are recorded in other current liabilities and other deferred credits and other liabilities in its Consolidated Balance Sheets. The Companies recognize revenue as they fulfill their obligations to provide service to their customers. During the nine months ended September 30, 2021 and 2020, Dominion Energy recognized revenue of $124 million and $95 million, respectively, from the beginning contract liability balances. During the nine months ended September 30, 2021 and 2020, Virginia Power recognized $36 million and $24 million, respectively, from the beginning contract liability balance.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 5. Income Taxes 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 Nine Months Ended September 30, 2021 2020 2021 2020 U.S. statutory rate 21.0 % 21.0 % 21.0 % 21.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 2.0 1.5 4.5 4.7 Investment tax credits (5.6 ) (30.5 ) (5.8 ) (5.6 ) Production tax credits (0.5 ) (2.4 ) (0.6 ) (0.9 ) Reversal of excess deferred income taxes (3.8 ) (14.5 ) (2.2 ) (1.9 ) State legislative change (1.0 ) — (1.0 ) — Change in tax status — (6.1 ) — — AFUDC - equity (0.5 ) (1.1 ) (0.5 ) (0.3 ) Changes in state deferred taxes associated with assets held for sale (0.5 ) (11.6 ) — — Absence of tax on noncontrolling interest (0.2 ) 14.1 — — Other, net (1.1 ) (1.8 ) — — Effective tax rate 9.8 % (31.4 )% 15.4 % 17.0 % 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 2021. The reversal of these excess deferred income taxes will impact the effective tax rate and rates charged to customers. See Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. For the nine months ended September 30, 2021, the Companies’ effective tax rates reflect the benefit of a state legislative change enacted in April 2021 for tax years beginning January 1, 2022. Dominion Energy’s effective tax rate reflects a $21 million deferred tax benefit, inclusive of a $16 million deferred tax benefit at Virginia Power. For the nine months ended September 30, 2020, Dominion Energy’s effective tax rate reflects an income tax benefit of $45 million associated with the remeasurement of consolidated state deferred taxes with the classification of gas transmission and storage operations as held for sale. In addition, Dominion Energy’s effective tax rate reflects an income tax expense of $55 million attributable to the noncontrolling interest primarily associated with the impairment of solar assets held in partnership form discussed in Note 11. As of September 30, 2021, there have been no material changes in the Companies’ unrecognized tax benefits or possible changes that could reasonably be expected to occur during the next twelve months. See Note 5 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020, for a discussion of these unrecognized tax benefits. Discontinued operations Income tax expense (benefit) included in discontinued operations is $5 million and $(572) million for the nine months ended September 30, 2021 and 2020, respectively. 2021 income taxes include a $15 million benefit related to finalizing income tax returns on the GT&S Transaction. 2020 income taxes reflect a charge of $81 million for the write-off of tax-related regulatory assets associated with the Atlantic Coast Pipeline Project.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Note 6. Earnings Per Share The following table presents the calculation of Dominion Energy’s basic and diluted EPS: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions, except EPS) Net income attributable to Dominion Energy from continuing operations $ 589 $ 369 $ 1,828 $ 767 Preferred stock dividends (see Note 16) (16 ) (16 ) (48 ) (48 ) Net income attributable to Dominion Energy from continuing operations – Basic 573 353 1,780 719 Dilutive effect of Series A Preferred Stock — — — (28 ) Net income attributable to Dominion Energy from continuing operations - Diluted $ 573 $ 353 $ 1,780 $ 691 Net income (loss) attributable to Dominion Energy from discontinued operations - Basic & Diluted $ 65 $ (13 ) $ 119 $ (1,850 ) Average shares of common stock outstanding – Basic 808.7 833.8 807.1 837.1 Net effect of dilutive securities (1) 1.3 — 0.5 — Average shares of common stock outstanding – Diluted 810.0 833.8 807.6 837.1 EPS from continuing operations – Basic $ 0.71 $ 0.42 $ 2.20 $ 0.86 EPS from discontinued operations – Basic 0.08 (0.01 ) 0.15 (2.21 ) EPS attributable to Dominion Energy – Basic $ 0.79 $ 0.41 $ 2.35 $ (1.35 ) EPS from continuing operations – Diluted $ 0.71 $ 0.42 $ 2.20 $ 0.83 EPS from discontinued operations – Diluted 0.08 (0.01 ) 0.15 (2.21 ) EPS attributable to Dominion Energy – Diluted $ 0.79 $ 0.41 $ 2.35 $ (1.38 ) (1) Primarily related to shares expected to be issued to settle litigation. The 2019 Equity Units and the Q-Pipe Transaction deposit, prior to being settled in cash in July 2021, are potentially dilutive securities. See Note 19 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 and Note 3, respectively, for additional information. Additionally, the two September 2020 accelerated share purchase agreements were potentially dilutive for the three and nine months ended September 30, 2020. See Note 16 for additional information. The forward stock purchase contracts included within the 2019 Equity Units are excluded from the calculation of diluted EPS from continuing operations for the three and nine months ended September 30, 2021 and 2020, as the dilutive stock price threshold was not met. The Series A Preferred Stock included within the 2019 Equity Units is excluded from the calculation of diluted EPS from continuing operations based upon the expectation that the conversion will be settled in cash rather than through the issuance of Dominion Energy common stock. As described in Note 16, effective November 2021 any settlement of the conversion up to $1,000 per share is payable in cash, and any amount in excess of $1,000 per share may be settled in cash, common stock or a combination thereof. For the three and nine months ended September 30, 2021 and the three months ended September 30, 2020, a fair value adjustment related to the Series A Preferred Stock included within the 2019 Equity Units is excluded from the calculation of diluted EPS from continuing operations, as such fair value adjustment was not dilutive during the periods. The impact of settling the deposit associated with the Q-Pipe Transaction in shares is excluded from the calculation of diluted EPS from continuing operations for the three and nine months ended September 30, 2021 based upon the expectation Dominion Energy would settle in cash, which occurred in July 2021, rather than through the issuance of Dominion Energy common stock. The forward stock purchase contracts included within the September 2020 accelerated share repurchase agreements are excluded from the calculation of diluted EPS for the three and nine months ended September 30, 2020 as the dilutive stock price threshold was not met.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 7. Accumulated Other Comprehensive Income (Loss) Dominion Energy The following table presents Dominion Energy’s changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrealized gains and losses on investment securities Unrecognized pension and other postretirement benefit costs Other comprehensive loss from equity method investees Total (millions) Three Months Ended September 30, 2021 Beginning balance $ (371 ) $ 41 $ (1,309 ) $ (1 ) $ (1,640 ) Other comprehensive income before reclassifications: gains (losses) (2 ) 4 (1 ) (3 ) (2 ) Amounts reclassified from AOCI: (gains) losses (1) 10 (3 ) 19 — 26 Net current period other comprehensive income (loss) 8 1 18 (3 ) 24 Ending balance $ (363 ) $ 42 $ (1,291 ) $ (4 ) $ (1,616 ) Three Months Ended September 30, 2020 Beginning balance $ (644 ) $ 51 $ (1,385 ) $ (2 ) $ (1,980 ) Other comprehensive income before reclassifications: gains (losses) 10 4 (261 ) 1 (246 ) Amounts reclassified from AOCI: (gains) losses (1) 188 (1 ) 23 — 210 Net current period other comprehensive income (loss) 198 3 (238 ) 1 (36 ) Ending balance $ (446 ) $ 54 $ (1,623 ) $ (1 ) $ (2,016 ) Nine Months Ended September 30, 2021 Beginning balance $ (419 ) $ 62 $ (1,359 ) $ (1 ) $ (1,717 ) Other comprehensive income before reclassifications: gains (losses) 21 (15 ) 5 (3 ) 8 Amounts reclassified from AOCI: (gains) losses (1) 35 (5 ) 63 — 93 Net current period other comprehensive income (loss) 56 (20 ) 68 (3 ) 101 Ending balance $ (363 ) $ 42 $ (1,291 ) $ (4 ) $ (1,616 ) Nine Months Ended September 30, 2020 Beginning balance $ (407 ) $ 37 $ (1,421 ) $ (2 ) $ (1,793 ) Other comprehensive income before reclassifications: gains (losses) (254 ) 32 (262 ) 1 (483 ) Amounts reclassified from AOCI: (gains) losses (1) 215 (15 ) 60 — 260 Net current period other comprehensive income (loss) (39 ) 17 (202 ) 1 (223 ) Ending balance $ (446 ) $ 54 $ (1,623 ) $ (1 ) $ (2,016 ) (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 reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended September 30, 2021 Deferred (gains) and losses on derivatives-hedging activities: Interest rate contracts $ 14 Interest and related charges Total 14 Tax (4 ) Income tax expense (benefit) Total, net of tax $ 10 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (4 ) Other income Total (4 ) Tax 1 Income tax expense (benefit) Total, net of tax $ (3 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (5 ) Other income Amortization of actuarial losses 30 Other income Total 25 Tax (6 ) Income tax expense (benefit) Total, net of tax $ 19 Three Months Ended September 30, 2020 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (8 ) Operating revenue Interest rate contracts 23 Interest and related charges 230 Discontinued operations Foreign currency contracts 6 Discontinued operations Total 251 Tax (63 ) Income tax expense (benefit) Total, net of tax $ 188 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (3 ) Other income Total (3 ) Tax 2 Income tax expense (benefit) Total, net of tax $ (1 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (5 ) Other income Amortization of actuarial losses 36 Other income Total 31 Tax (8 ) Income tax expense (benefit) Total, net of tax $ 23 Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Nine Months Ended September 30, 2021 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 1 Purchased gas Interest rate contracts 46 Interest and related charges Total 47 Tax (12 ) Income tax expense (benefit) Total, net of tax $ 35 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (7 ) Other income Total (7 ) Tax 2 Income tax expense (benefit) Total, net of tax $ (5 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (15 ) Other income Amortization of actuarial losses 100 Other income Total 85 Tax (22 ) Income tax expense (benefit) Total, net of tax $ 63 Nine Months Ended September 30, 2020 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (22 ) Operating revenue 3 Purchased gas (2 ) Discontinued operations Interest rate contracts 66 Interest and related charges 236 Discontinued operations Foreign currency contracts 6 Discontinued operations Total 287 Tax (72 ) Income tax expense (benefit) Total, net of tax $ 215 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (21 ) Other income Total (21 ) Tax 6 Income tax expense (benefit) Total, net of tax $ (15 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (16 ) Other income Amortization of actuarial losses 97 Other income Total 81 Tax (21 ) Income tax expense (benefit) Total, net of tax $ 60 Virginia Power The following table presents Virginia Power’s changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrealized gains and losses on investment securities Total (millions) Three Months Ended September 30, 2021 Beginning balance $ (39 ) $ 6 $ (33 ) Other comprehensive income before reclassifications: gains (losses) (2 ) — (2 ) Amounts reclassified from AOCI: (gains) losses (1) — (1 ) (1 ) Net current period other comprehensive income (loss) (2 ) (1 ) (3 ) Ending balance $ (41 ) $ 5 $ (36 ) Three Months Ended September 30, 2020 Beginning balance $ (78 ) $ 8 $ (70 ) Other comprehensive income before reclassifications: gains (losses) 5 — 5 Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) 6 (1 ) 5 Ending balance $ (72 ) $ 7 $ (65 ) Nine Months Ended September 30, 2021 Beginning balance $ (60 ) $ 8 $ (52 ) Other comprehensive income before reclassifications: gains (losses) 18 (2 ) 16 Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) 19 (3 ) 16 Ending balance $ (41 ) $ 5 $ (36 ) Nine Months Ended September 30, 2020 Beginning balance $ (34 ) $ 5 $ (29 ) Other comprehensive income before reclassifications: gains (losses) (39 ) 4 (35 ) Amounts reclassified from AOCI: (gains) losses (1) 1 (2 ) (1 ) Net current period other comprehensive income (loss) (38 ) 2 (36 ) Ending balance $ (72 ) $ 7 $ (65 ) (1) Amounts are allocated as follows within Virginia Power’s Consolidated Statements of Income; deferred gains and losses on derivatives – hedging activities are recorded to interest and related charges, unrealized gains and losses on investment securities are recorded to other income and associated tax amounts are recorded to income tax expense .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 8. Fair Value Measurements The Companies’ fair value measurements are made in accordance with the policies discussed in Note 6 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. See Note 9 in this report for further information about the Companies’ derivatives and hedge accounting activities. 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, futures and swaps contracts. An option model is used to value Level 3 physical options. The discounted cash flow model for forwards, futures and swaps calculates mark-to-market valuations based on forward market prices, original transaction prices, volumes, risk-free rate of return and credit spreads. The option model calculates mark-to-market valuations using variations of the Black-Scholes option model. The inputs into the models are the forward market prices, implied price volatilities, risk-free rate of return, the option expiration dates, the option strike prices, the original sales prices and volumes. For Level 3 fair value measurements, certain forward market prices and implied price volatilities are considered unobservable. The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at September 30, 2021. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value (millions) Valuation Techniques Unobservable Input Range Weighted Average (1) Assets Physical and financial forwards: Natural gas (2) $ 52 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 64 Discounted cash flow Market price (per MWh) (3) (1) - 6 2 Electricity 38 Discounted cash flow Market price (per MWh) (3) 24 - 97 37 Physical options: Natural gas 6 Option model Market price (per Dth) (3) 4 - 10 7 Price volatility (4) 19% - 32% 24 % Total assets $ 160 Liabilities Physical and financial forwards: Natural gas (2) $ 1 Discounted cash flow Market price (per Dth) (3) (2) - 5 — FTRs 6 Discounted cash flow Market price (per MWh) (3) (3) - 6 1 Electricity 9 Discounted cash flow Market price (per MWh) (3) 24 - 111 39 Total liabilities $ 16 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Inputs Position Change to Input Impact on Fair Value Measurement 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 In the second quarter of 2021, Dominion Energy recorded a charge of $20 million ($15 million after-tax) in impairment of assets and other charges in its Consolidated Statements of Income to write off substantially all of the long-lived assets of its nonregulated retail software development operations to their estimated fair value, using a market approach, of less than $1 million. The valuation is considered a Level 2 fair value measurement given that it is based on bids received. In the third quarter of 2021, Dominion Energy recorded a charge of $16 million ($12 million after-tax) in impairment of assets and other charges in its Consolidated Statements of Income to adjust a corporate office building down to its estimated fair value, using both an income and market approach, of $26 million. The valuation is considered a Level 3 measurement due to the use of significant judgmental and unobservable inputs, including projected timing and amount of future cash flows and discount rates inherent in the future cash flows and market prices. The corporate office building is reflected in the Corporate and Other segment and presented as held for sale in Dominion Energy’s Consolidated Balance Sheets at September 30, 2021. See Note 3 for information on the nonrecurring fair value measurement associated with the acquisition of Birdseye. See Notes 10 and 11 for information on nonrecurring fair value measurements associated with charges recorded related to Fowler Ridge and non-wholly-owned nonregulated solar facilities, respectively. Recurring Fair Value Measurements 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) At September 30, 2021 Assets Derivatives: Commodity $ — $ 125 $ 160 $ 285 Interest rate — 371 — 371 Investments (1) Equity securities: U.S. 4,738 — — 4,738 Fixed income: Corporate debt instruments — 879 — 879 Government securities 774 715 — 1,489 Cash equivalents and other 3 — — 3 Total assets $ 5,515 $ 2,090 $ 160 $ 7,765 Liabilities Derivatives: Commodity $ — $ 607 $ 16 $ 623 Interest rate — 327 — 327 Total liabilities $ — $ 934 $ 16 $ 950 At December 31, 2020 Assets Derivatives: Commodity $ — $ 57 $ 110 $ 167 Interest rate — 230 — 230 Investments (1) Equity securities: U.S. 4,648 — — 4,648 Fixed income: Corporate debt instruments — 629 — 629 Government securities 508 730 — 1,238 Cash equivalents and other 32 15 — 47 Total assets $ 5,188 $ 1,661 $ 110 $ 6,959 Liabilities Derivatives: Commodity $ — $ 48 $ 7 $ 55 Interest rate — 431 — 431 Total liabilities $ — $ 479 $ 7 $ 486 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $382 million and $340 million of assets at September 30, 2021 and December 31, 2020, 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: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Beginning balance $ 62 $ 123 $ 103 $ (37 ) Total realized and unrealized gains (losses): Included in earnings: Operating revenue (6 ) — (8 ) — Electric fuel and other energy-related purchases 29 — 12 (26 ) Included in regulatory assets/liabilities 88 4 49 164 Settlements (29 ) — (12 ) 26 Ending balance $ 144 $ 127 $ 144 $ 127 There are $(6) million and $(8) million of unrealized gains and losses included in operating revenue in the Level 3 fair value category related to assets/liabilities still held at the reporting date for the three and nine months ended September 30, 2021, respectively. There were no unrealized gains and losses included in earnings in the Level 3 fair value category related to assets/liabilities still held at the reporting date for the three and nine months ended September 30, 2020. Virginia Power The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at September 30, 2021. The range and weighted average are presented in dollars for market price inputs. Fair Value (millions) Valuation Techniques Unobservable Input Range Weighted Average (1) Assets Physical and financial forwards: Natural gas (2) $ 52 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 64 Discounted cash flow Market price (per MWh) (3) (1) - 6 2 Physical options: Natural gas 6 Option model Market price (per Dth) (3) 4 - 10 7 Price volatility (4) 19% - 32% 24 % Total assets $ 122 Liabilities Physical and financial forwards: Natural gas (2) $ 1 Discounted cash flow Market price (per Dth) (3) (2) - 5 — FTRs 6 Discounted cash flow Market price (per MWh) (3) (3) - 6 1 Total liabilities $ 7 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Inputs Position Change to Input Impact on Fair Value Measurement 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) At September 30, 2021 Assets Derivatives: Commodity $ — $ 67 $ 122 $ 189 Interest rate — 170 — 170 Investments (1) Equity securities: U.S. 2,188 — — 2,188 Fixed income: Corporate debt instruments — 516 — 516 Government securities 349 274 — 623 Total assets $ 2,537 $ 1,027 $ 122 $ 3,686 Liabilities Derivatives: Commodity $ — $ 164 $ 7 $ 171 Interest rate — 282 — 282 Total liabilities $ — $ 446 $ 7 $ 453 At December 31, 2020 Assets Derivatives: Commodity $ — $ 5 $ 110 $ 115 Interest rate — 66 — 66 Investments (1) Equity securities: U.S. 2,171 — — 2,171 Fixed income: Corporate debt instruments — 348 — 348 Government securities 201 309 — 510 Cash equivalents and other 13 — — 13 Total assets $ 2,385 $ 728 $ 110 $ 3,223 Liabilities Derivatives: Commodity $ — $ 22 $ 7 $ 29 Interest rate — 376 — 376 Total liabilities $ — $ 398 $ 7 $ 405 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $183 million and $167 million of assets at September 30, 2021 and December 31, 2020, 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: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Beginning balance $ 74 $ 123 $ 103 $ (37 ) Total realized and unrealized gains (losses): Included in earnings: Electric fuel and other energy-related purchases 27 — 10 (26 ) Included in regulatory assets/liabilities 41 4 12 164 Settlements (27 ) — (10 ) 26 Ending balance $ 115 $ 127 $ 115 $ 127 There were no unrealized gains or losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date for the three and nine months ended September 30, 2021 and 2020. 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: September 30, 2021 December 31, 2020 Carrying Amount Estimated Fair Value (1) Carrying Amount Estimated Fair Value (1) (millions) Dominion Energy Long-term debt (2)(3) $ 35,140 $ 40,471 $ 31,996 $ 38,773 Supplemental credit facility borrowings (4) 900 900 225 225 Junior subordinated notes (5) 1,386 1,503 3,411 3,633 Virginia Power Long-term debt (5) $ 13,212 $ 15,570 $ 13,207 $ 16,455 (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 and discount or premium. At September 30, 2021 and December 31, 2020, the carrying amount includes the valuation of certain fair value hedges associated with fixed rate debt of $2 million and $3 million, respectively. (3) Includes amounts classified as held for sale, see Note 3. (4) Also includes Supplemental 364-Day ( 5 ) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium.

Derivatives and Hedge Accountin

Derivatives and Hedge Accounting Activities	9 Months Ended
	Sep. 30, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedge Accounting Activities	Note 9. Derivatives and Hedge Accounting Activities The Companies’ accounting policies, objectives and strategies for using derivative instruments are discussed in Note 2 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. See Note 8 in this report 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. The Companies’ derivative contracts include both over-the-counter transactions and those that are executed on an exchange or other trading platform (exchange contracts) and centrally cleared. Over-the-counter contracts are bilateral contracts that are transacted directly with a third party. Exchange contracts utilize a financial intermediary, exchange, or clearinghouse to enter, execute or clear the transactions. Certain over-the-counter and exchange contracts contain contractual rights of setoff through master netting arrangements, derivative clearing agreements and contract default provisions. In addition, the contracts are subject to conditional rights of setoff through counterparty nonperformance, insolvency or other conditions. In general, most over-the-counter transactions and all exchange contracts are subject to collateral requirements. Types of collateral for over-the-counter and exchange contracts include cash, letters of credit, and in some cases other forms of securities, none of which are subject to restrictions. Cash collateral, as presented in the table below, is used to offset derivative assets and liabilities. Certain accounts receivable and accounts payable recognized on the Companies’ Consolidated Balance Sheets, letters of credit and other forms of securities, as well as certain long-term debt, all of which are not included in the tables below, are subject to offset under master netting or similar arrangements and would reduce the net exposure. See Note 18 for further information regarding credit-related contingent features for the Companies’ derivative instruments. Dominion Energy 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: September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 202 $ 10 $ — $ 192 $ 117 $ 9 $ — $ 108 Exchange 45 32 — 13 49 24 — 25 Interest rate contracts: Over-the-counter 371 27 — 344 230 13 — 217 Total derivatives, subject to a master netting or similar arrangement $ 618 $ 69 $ — $ 549 $ 396 $ 46 $ — $ 350 (1) Excludes $38 September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 148 $ 10 $ 79 $ 59 $ 30 $ 9 $ — $ 21 Exchange 473 32 441 — 24 24 — — Interest rate contracts: Over-the-counter 327 27 11 289 431 13 17 401 Total derivatives, subject to a master netting or similar arrangement $ 948 $ 69 $ 531 $ 348 $ 485 $ 46 $ 17 $ 422 (1) Excludes $2 million and $1 million of derivative liabilities at September 30, 2021 and December 31, 2020, respectively, which are not subject to master Volumes The following table presents the volume of Dominion Energy’s derivative activity at September 30, 2021. 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 its long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 59 9 Basis 202 472 Electricity (MWh): Fixed price 14,286,444 32,508,487 FTRs 71,265,005 — Interest rate (2) $ 1,600 $ 6,715 (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 Dominion Energy’s Consolidated Balance Sheet at September 30, 2021: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (363 ) $ (43 ) 387 months Total $ (363 ) $ (43 ) The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., interest rate payments) 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 interest 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. There were no derivative instruments designated as fair value hedges during the three and nine months ended September 30, 2021 and 2020. The following table presents the amounts recorded on the balance sheet related to cumulative basis adjustments for fair value hedges, all of which related to discontinued hedging relationships at both September 30, 2021 and December 31, 2020: Carrying Amount of the Hedged Asset (Liability) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (Liabilities) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 (millions) Long-term debt $ (752 ) $ (1,153 ) $ (2 ) $ (3 ) Fair Value and Gains and Losses on Derivative Instruments The following table presents the fair values of Dominion Energy’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Derivatives under Hedge Accounting Fair Value – Derivatives not under Hedge Accounting Total Fair Value (millions) September 30, 2021 ASSETS Current Assets Commodity $ — $ 190 $ 190 Interest rate — 19 19 Total current derivative assets (1) — 209 209 Noncurrent Assets Commodity — 95 95 Interest rate 170 182 352 Total noncurrent derivative assets (2) 170 277 447 Total derivative assets $ 170 $ 486 $ 656 LIABILITIES Current Liabilities Commodity $ — $ 484 $ 484 Interest rate 253 17 270 Total current derivative liabilities (3) 253 501 754 Noncurrent Liabilities Commodity — 139 139 Interest rate 29 28 57 Total noncurrent derivative liabilities (4) 29 167 196 Total derivative liabilities $ 282 $ 668 $ 950 December 31, 2020 ASSETS Current Assets Commodity $ — $ 58 $ 58 Interest rate — 9 9 Total current derivative assets (1) — 67 67 Noncurrent Assets Commodity — 109 109 Interest rate 66 155 221 Total noncurrent derivative assets (2) 66 264 330 Total derivative assets $ 66 $ 331 $ 397 LIABILITIES Current Liabilities Commodity $ — $ 42 $ 42 Interest rate 363 10 373 Total current derivative liabilities (3) 363 52 415 Noncurrent Liabilities Commodity — 13 13 Interest rate 19 39 58 Total noncurrent derivative liabilities (4) 19 52 71 Total derivative liabilities $ 382 $ 104 $ 486 (1) Current derivative assets include $182 million and $63 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, respectively. The remainder is presented in current assets held for sale 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) I (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) Recognized in AOCI on Derivatives (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ (2 ) $ (14 ) $ 9 Total $ (2 ) $ (14 ) $ 9 Three Months Ended September 30, 2020 Derivative type and location of gains (losses): Commodity: Operating revenue $ 8 Total commodity $ — $ 8 $ — Interest rate: Interest and related charges $ (23 ) Discontinued operations (230 ) Total interest rate $ 8 $ (253 ) $ 62 Foreign currency (4) 6 (6 ) — Total $ 14 $ (251 ) $ 62 Nine Months Ended September 30, 2021 Derivative type and location of gains (losses): Commodity: Purchased gas $ (1 ) Total commodity $ — $ (1 ) $ — Interest rate (3) 29 (46 ) 198 Total $ 29 $ (47 ) $ 198 Nine Months Ended September 30, 2020 Derivative type and location of gains (losses): Commodity: Operating revenue $ 22 Purchased gas (3 ) Discontinued operations 2 Total commodity $ — $ 21 $ — Interest rate: Interest and related charges $ (66 ) Discontinued operations (236 ) Total interest rate $ (328 ) $ (302 ) $ (488 ) Foreign currency (4) (11 ) (6 ) — Total $ (339 ) $ (287 ) $ (488 ) (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 Statement of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statement of Income are classified in discontinued operations. Derivatives not designated as hedging instruments Amount of Gain (Loss) Recognized in Income on Derivatives (1) Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ (334 ) $ (15 ) $ (521 ) $ 31 Purchased gas 25 4 32 (6 ) Electric fuel and other energy-related purchases 44 (6 ) 7 (79 ) Discontinued operations — (1 ) — 4 Interest rate: Interest and related charges (20 ) 57 142 (21 ) Discontinued operations — 5 — (3 ) Foreign Currency: Discontinued operations — 8 — 8 Total $ (285 ) $ 52 $ (340 ) $ (66 ) (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: September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 122 $ 7 $ — $ 115 $ 111 $ 6 $ — $ 105 Exchange 4 4 — — 1 1 — — Interest rate contracts: Over-the-counter 170 19 — 151 66 7 — 59 Total derivatives, subject to a master netting or similar arrangement $ 296 $ 30 $ — $ 266 $ 178 $ 14 $ — $ 164 (1) Excludes $63 September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 123 $ 7 $ 79 $ 37 $ 6 $ 6 $ — $ — Exchange 46 4 42 — 1 1 — — Interest rate contracts: Over-the-counter 282 19 — 263 376 7 — 369 Total derivatives, subject to a master netting or similar arrangement $ 451 $ 30 $ 121 $ 300 $ 383 $ 14 $ — $ 369 (1) Excludes $2 Volumes The following table presents the volume of Virginia Power’s derivative activity at September 30, 2021. 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 its long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 23 9 Basis 143 465 Electricity (MWh): Fixed price 5,953,983 6,092,512 FTRs 71,265,005 — Interest rate (2) $ 850 $ 1,900 (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 September 30, 2021: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (41 ) $ (2 ) 387 months Total $ (41 ) $ (2 ) 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 table presents the fair values of Virginia Power’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Derivatives under Hedge Accounting Fair Value – Derivatives not under Hedge Accounting Total Fair Value (millions) September 30, 2021 ASSETS Current Assets Commodity $ — $ 117 $ 117 Total current derivative assets (1) — 117 117 Noncurrent Assets Commodity — 72 72 Interest rate 170 — 170 Total noncurrent derivative assets (2) 170 72 242 Total derivative assets $ 170 $ 189 $ 359 LIABILITIES Current Liabilities Commodity $ — $ 136 $ 136 Interest rate 253 — 253 Total current derivative liabilities 253 136 389 Noncurrent Liabilities Commodity — 35 35 Interest rate 29 — 29 Total noncurrent derivative liabilities (3) 29 35 64 Total derivative liabilities $ 282 $ 171 $ 453 December 31, 2020 ASSETS Current Assets Commodity $ — $ 22 $ 22 Total current derivative assets (1) — 22 22 Noncurrent Assets Commodity — 93 93 Interest rate 66 — 66 Total noncurrent derivative assets (2) 66 93 159 Total derivative assets $ 66 $ 115 $ 181 LIABILITIES Current Liabilities Commodity $ — $ 28 $ 28 Interest rate 362 — 362 Total current derivative liabilities 362 28 390 Noncurrent Liabilities Commodity — 1 1 Interest rate 14 — 14 Total noncurrent derivative liabilities (3) 14 1 15 Total derivative liabilities $ 376 $ 29 $ 405 (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 relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ (2 ) $ (1 ) $ 8 Total $ (2 ) $ (1 ) $ 8 Three Months Ended September 30, 2020 Derivative type and location of gains (losses): Interest rate (3) $ 6 $ (1 ) $ 60 Total $ 6 $ (1 ) $ 60 Nine Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ 24 $ (2 ) $ 194 Total $ 24 $ (2 ) $ 194 Nine Months Ended September 30, 2020 Derivative type and location of gains (losses): Interest rate (3) $ (53 ) $ (2 ) $ (492 ) Total $ (53 ) $ (2 ) $ (492 ) (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) Recognized in Income on Derivatives (1) Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Derivative type and location of gains (losses): Commodity: Operating Revenue $ (19 ) $ — (25 ) $ — Electric fuel and other energy-related purchases 42 (6 ) 5 (79 ) Total $ 23 $ (6 ) $ (20 ) $ (79 ) (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.

Investments

Investments	9 Months Ended
	Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]
Investments	Note 10. 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 $122 million and $134 million at September 30, 2021 and December 31, 2020, 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 Allowance for Credit Losses Fair Value (millions) September 30, 2021 Equity securities: (1) U.S. $ 1,546 $ 3,247 $ (11 ) $ 4,782 Fixed income securities: (2) Corporate debt instruments 842 40 (3 ) $ — 879 Government securities 1,414 44 (6 ) — 1,452 Common/collective trust funds 187 5 — — 192 Insurance contracts 246 — — 246 Cash equivalents and other (3) (28 ) 3 (20 ) — (45 ) Total $ 4,207 $ 3,339 $ (40 ) (4) $ — $ 7,506 December 31, 2020 Equity securities: (1) U.S. $ 1,756 $ 2,948 $ (24 ) $ 4,680 Fixed income securities: (2) Corporate debt instruments 572 58 (1 ) $ — 629 Government securities 1,119 66 (1 ) — 1,184 Common/collective trust funds 170 5 — — 175 Insurance contracts 237 — — 237 Cash equivalents and other (3) (8 ) 4 (1 ) — (5 ) Total $ 3,846 $ 3,081 $ (27 ) (4) $ — $ 6,900 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Changes in allowance for credit losses are included in other income. (3) Includes pending purchases of securities of $48 million and $49 million at September 30, 2021 and December 31, 2020, respectively. (4) The fair value of securities in an unrealized loss position was $846 million and $293 million at September 30, 2021 and December 31, 2020, respectively. The portion of unrealized gains and losses that relates to equity securities held within Dominion Energy’s nuclear decommissioning trusts is summarized below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Net gains (losses) recognized during the period $ (15 ) $ 308 $ 616 $ 20 Less: Net (gains) losses recognized during the period on securities sold during the period (11 ) (15 ) (323 ) (6 ) Unrealized gains (losses) recognized during the period on securities still held at period end (1) $ (26 ) $ 293 $ 293 $ 14 (1) Included in other income and the nuclear decommissioning trust regulatory liability. The fair value of Dominion Energy’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at September 30, 2021 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 351 Due after one year through five years 667 Due after five years through ten years 654 Due after ten years 851 Total $ 2,523 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. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Proceeds from sales $ 614 $ 1,208 $ 3,324 $ 2,868 Realized gains (1) 25 48 405 188 Realized losses (1) 7 29 81 159 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability. 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 Allowance for Credit Losses Fair Value (millions) September 30, 2021 Equity securities: (1) U.S. $ 829 $ 1,497 $ (10 ) $ 2,316 Fixed income securities: (2) Corporate debt instruments 497 21 (1 ) $ — 517 Government securities 608 16 (2 ) — 622 Common/collective trust funds 54 — — — 54 Cash equivalents and other (3) (2 ) — — — (2 ) Total $ 1,986 $ 1,534 $ (13 ) (4) $ — $ 3,507 December 31, 2020 Equity securities: (1) U.S. $ 929 $ 1,371 $ (21 ) $ 2,279 Fixed income securities: (2) Corporate debt instruments 315 33 — $ — 348 Government securities 484 25 — — 509 Common/collective trust funds 58 — — — 58 Cash equivalents and other (3) 3 — — — 3 Total $ 1,789 $ 1,429 $ (21 ) (4) $ — $ 3,197 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability . (3) Includes pending purchases of securities o f $ 2 million an d $ 10 million at September 30, 2021 and December 31, 2020, respectively. (4) The fair value of securities in an unrealized loss position was $397 million and $142 million The portion of unrealized gains and losses that relates to equity securities held within Virginia Power’s nuclear decommissioning trusts is summarized below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Net gains (losses) recognized during the period $ 6 $ 138 $ 319 $ (16 ) Less: Net (gains) losses recognized during the period on securities sold during the period (9 ) (6 ) (182 ) (3 ) Unrealized gains (losses) recognized during the period on securities still held at period end (1) $ (3 ) $ 132 $ 137 $ (19 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability. The fair value of Virginia Power’s fixed income securities with readily determinable fair values held in nuclear decommissioning trust funds at September 30, 2021 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 83 Due after one year through five years 354 Due after five years through ten years 372 Due after ten years 384 Total $ 1,193 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. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Proceeds from sales $ 216 $ 164 $ 1,465 $ 694 Realized gains (1) 17 18 213 73 Realized losses (1) 2 10 28 58 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability. Equity Method Investments Dominion Energy recorded equity earnings on its investments of $214 million and less than $1 million for the nine months ended September 30, 2021 and 2020, respectively, in earnings from equity method investees in its Consolidated Statements of Income. In addition, Dominion Energy recorded equity losses of $19 and $2.3 billion for the nine months ended September 30, 2021 and 2020, respectively, in discontinued operations related to its investment in Atlantic Coast Pipeline. Dominion Energy received distributions of $263 million and $25 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021 and December 31, 2020, the net difference between the carrying amount of Dominion Energy’s investments and its share of underlying equity in net assets was $231 million and $213 million, respectively. At September 30, 2021, these differences are comprised of $ million of equity method goodwill that is not being amortized, a $ million basis difference from Dominion Energy’s investment in Cove Point, which is being amortized over the useful lives of the underlying assets, and a net $(18) million basis difference primarily attributable to an unfunded commitment made to Align RNG. At December 31, 2020, these differences are comprised of $27 million of equity method goodwill that is not being amortized, a $227 million basis difference from Dominion Energy’s investment in Cove Point, which is being amortized over the useful lives of the underlying assets , and a net $(41) million basis difference primarily attributable to an unfunded commitment made to Align RNG. Cove Point In November 2020, in conjunction with the GT&S Transaction, Dominion Energy sold 100% of its general partner interest and 25% of the total limited partner interest in Cove Point. Dominion Energy retained a 50% noncontrolling limited partnership interest in Cove Point which is accounted for as an equity method investment, as discussed in Note 9 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Income before income taxes recorded by Cove Point was $136 million and $132 million for the three months ended September 30, 2021 and 2020, respectively, and $410 million and $396 million for the nine months ended September 30, 2021 and 2020, respectively. For the periods prior to closing of the GT&S Transaction, earnings attributable to Dominion Energy are presented in discontinued operations and subsequent to the closing, earnings attributable to Dominion Energy are presented within earnings from equity method investees Dominion Energy recorded distributions from Cove Point of $85 million and $235 million for the three and nine months ended September 30, 2021, respectively. No contributions were made to Cove Point for the three and nine months ended September 30, 2021. Atlantic Coast Pipeline A description of Dominion Energy’s investment in Atlantic Coast Pipeline, including events that led to the cancellation of the Atlantic Coast Pipeline Project in July 2020, is included in Note 9 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. At September 30, 2021 and December 31, 2020, Dominion Energy has recorded a liability of $112 million and $1.1 billion, respectively, in its Consolidated Balance Sheets as a result of its share of equity losses exceeding its investment which reflects Dominion Energy’s obligations on behalf of Atlantic Coast Pipeline related to its credit facility, through February 2021, and AROs. In February 2021, Atlantic Coast Pipeline repaid the outstanding borrowed amounts and terminated its revolving credit facility. As of December 31, 2020, Atlantic Coast Pipeline had borrowed $1.8 billion against the revolving credit facility. Concurrently, Dominion Energy’s related guarantee agreement to support its portion of Atlantic Coast Pipeline’s borrowings was also terminated. Dominion Energy’s Consolidated Balance Sheets included a liability of $6 million associated with this guarantee agreement at December 31, 2020. Dominion Energy recorded contributions of $45 million during the three months ended September 30, 2020, and $965 million and $74 million during the nine months ended September 30, 2021 and 2020, respectively, to Atlantic Coast Pipeline. Dominion Energy recorded no contributions during the three months ended September 30, 2021 to Atlantic Coast Pipeline. Dominion Energy expects to incur additional losses from Atlantic Coast Pipeline as it completes wind-down activities. While Dominion Energy is unable to precisely estimate the amounts to be incurred by Atlantic Coast Pipeline, the portion of such amounts attributable to Dominion Energy is not expected to be material to Dominion Energy’s results of operations, financial position or statement of cash flows. DETI provided services to Atlantic Coast Pipeline which totaled $7 million and $44 million for the three and nine months ended September 30, 2020, respectively, included in discontinued operations in Dominion Energy’s Consolidated Statements of Income. Wrangler A description of Dominion Energy’s investment in Wrangler is included in Note 9 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. At September 30, 2021 and December 31, 2020, $81 million and $63 million of assets and $21 million and $15 million of liabilities, respectively, associated with the remaining nonregulated retail energy marketing operations expected to be contributed to Wrangler by December 2021 were classified as held for sale and were included in current assets held for sale and current liabilities held for sale on Dominion Energy’s Consolidated Balance Sheets. The related disposal group is primarily comprised of customer receivables, goodwill, inventories, derivative assets and liabilities and accounts payable. All activity related to Wrangler is recorded in the Corporate and Other segment. Fowler Ridge In September 2020, Dominion Energy sold its 50% noncontrolling partnership interest in Fowler Ridge to BP and terminated an affiliate’s long-term power, capacity and renewable energy credit contract with Fowler Ridge for a net payment by Dominion Energy of $150 million. Dominion Energy recognized a loss of $221 $165 The $150 million payment was allocated between the contract termination and sale based on the relative fair value of each using an income approach. The fair value determinations for the payment allocations are considered Level 3 fair value measurements due to the use of significant judgmental and unobservable inputs, including the amount of future cash flows and discount rate reflecting risks inherent in the future cash flows and market prices.

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2021
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	Note 11. Property, Plant and Equipment Acquisitions of Nonregulated Solar Projects Other than the items discussed below, there have been no updates to acquisitions of solar projects by the Companies from those discussed in Note 10 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. The following table presents acquisitions by Virginia Power of non-jurisdictional solar projects. Virginia Power has claimed or expects to claim federal investment tax credits on the projects. Project Name Date Agreement Entered Date Agreement Closed Project Location Project Cost (millions) (1) Date of Commercial Operations MW Capacity Bookers Mill February 2021 June 2021 Virginia $ 200 Expected 2023 127 Belcher June 2019 August 2019 Virginia 164 June 2021 88 (1) Includes acquisition cost The following table presents acquisitions by Dominion Energy of solar projects. Dominion Energy has claimed or expects to claim federal investment tax credits on the projects. Project Name Date Agreement Entered Date Agreement Closed Project Location Project Cost (millions) (1) Date of Commercial Operations MW Capacity Trask May 2020 October 2020 South Carolina $ 22 March 2021 12 Hardin II August 2020 Expected 2021 Ohio 295 Expected 2022 150 (1) Includes acquisition cost In addition to the facilities discussed above, Dominion Energy has also entered into various agreements to install solar facilities, primarily at schools in Virginia, with in-service dates through 2022. As of September 30, 2021, Dominion Energy anticipates a total projected cost of approximately $65 million under these agreements with an associated aggregate generation capacity of 32 MW. Dominion Energy has claimed or expects to claim federal investment tax credits on the projects. Non-Wholly-Owned Nonregulated Solar Facilities Sale to Terra Nova Renewable Partners In August 2021, Dominion Energy entered into an agreement with Terra Nova Renewable Partners to sell SBL Holdco, which holds Dominion Energy’s remaining 67% controlling interest in certain nonregulated solar projects for consideration of $456 million, subject to customary closing adjustments, with the amount of cash reduced by the amount of SBL Holdco’s debt outstanding at closing . The transaction is expected to close in the fourth quarter of 2021, contingent on clearance or approval under the Hart-Scott-Rodino Act and by FERC as well as other customary closing and regulatory conditions . In September 2021, the waiting period under the Hart-Scott-Rodino Act expired. In October 2021, FERC approved the proposed sale. At September 30, 2021, $743 million of assets, primarily consisting of property, plant and equipment, and $339 million of liabilities, primarily consisting of long-term debt, were classified as held for sale in Dominion Energy’s Consolidated Balance Sheets. Dominion Energy expects to record a gain of approximately $30 million ($31 million after-tax) upon closing. Sale to Clearway In August 2021, Dominion Energy entered an agreement with Clearway to sell its 50% controlling interest in Four Brothers and Three Cedars for $335 million in cash, subject to customary closing adjustments. The transaction is expected to close in the fourth quarter of 2021, contingent on clearance or approval under the Hart-Scott-Rodino Act and by FERC as well as other customary closing and regulatory conditions. In October 2021, the waiting period under the Hart-Scott-Rodino Act expired. At September 30, 2021, $744 million of related assets, primarily consisting of property, plant and equipment, and $75 million of liabilities, primarily consisting of operating leases, were classified as held for sale in Dominion Energy’s Consolidated Balance Sheets. Dominion Energy expects to record a loss of approximately $225 million ($170 million after-tax) upon closing, primarily associated with the derecognition of noncontrolling interest. All activity related to Four Brothers and Three Cedars is recorded within Contracted Assets. Impairment In the third quarter of 2020, Dominion Energy performed a strategic review of its long-term intentions for its contracted nonregulated solar generation assets in partnerships outside of its core electric service territories in consideration of the impact of the VCEA and Dominion Energy’s decision to sell substantially all of its gas transmission and storage operations. Based on an evaluation of Dominion Energy’s interests in these long-lived assets for recoverability under a probability weighted approach, Dominion Energy determined the assets were impaired. As a result of this evaluation, Dominion Energy recorded a charge of $665 million ($293 million after-tax attributable to Dominion Energy and $267 million attributable to noncontrolling interest) in impairment of assets and other charges in its Consolidated Statements of Income for both the three and nine months ended September 30, 2020 to adjust the property, plant and equipment down to its estimated fair value of $1.4 billion. The fair value was estimated using an income approach. The valuation is considered a Level 3 fair value measurement due to the use of significant judgmental and unobservable inputs, including projected timing and amount of future cash flows and discount rates reflecting risks inherent in the future cash flows and market prices. Virginia Power CCRO Utilization In the third quarter of 2021, Virginia Power wrote off $318 million, primarily consisting of property, plant and equipment, net representing the utilization of a CCRO in accordance with the GTSA in connection with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. Acquisition of Gathering and Processing Assets In November 2021, Wexpro closed on an agreement with a natural gas gathering systems operator to purchase an existing natural gas gathering system in Wyoming including pipelines, compressors and dehydration equipment for total consideration of $41 million.

Regulatory Assets and Liabiliti

Regulatory Assets and Liabilities	9 Months Ended
	Sep. 30, 2021
Regulated Operations [Abstract]
Regulatory Assets and Liabilities	Note 12. Regulatory Assets and Liabilities Regulatory assets and liabilities include the following: September 30, 2021 December 31, 2020 (millions) Dominion Energy Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 147 $ — Deferred project costs and DSM programs for gas utilities (2) 37 35 Unrecovered gas costs (3) 161 78 Deferred rider costs for Virginia electric utility (4) 49 98 Deferred nuclear refueling outage costs (5) 70 53 NND Project costs (6) 138 138 PJM transmission rates (7) 9 71 Deferred early plant retirement charges (8) 226 — Derivatives (9) 161 33 Other 195 193 Regulatory assets-current 1,193 699 Pension and other postretirement benefit costs (10) 1,274 1,363 Deferred rider costs for Virginia electric utility (4) 442 311 Deferred project costs for gas utilities (2) 668 632 Interest rate hedges (11) 838 1,042 AROs and related funding (12) 332 331 Cost of reacquired debt (13) 11 245 NND Project costs (6) 2,261 2,364 Ash pond and landfill closure costs (14) 2,361 2,301 Deferred cost of fuel used in electric generation (1) 139 — Deferred early plant retirement charges (8) 282 — Other 605 544 Regulatory assets-noncurrent 9,213 9,133 Total regulatory assets $ 10,406 $ 9,832 Regulatory liabilities: Deferred cost of fuel used in electric generation (1) $ 1 $ 58 Provision for future cost of removal and AROs (15) 183 183 Reserve for refunds to electric utility customers (16) 422 128 Reserve for future credits to Virginia electric customers (17) — 120 Cost-of-service impact of 2017 Tax Reform Act (18) — 12 Income taxes refundable through future rates (19) 140 124 Monetization of guarantee settlement (20) 67 67 Commodity derivatives (21) 106 9 Other 140 108 Regulatory liabilities-current 1,059 809 Income taxes refundable through future rates (19) 4,274 4,376 Provision for future cost of removal and AROs (15) 2,321 2,150 Nuclear decommissioning trust (22) 1,958 1,719 Monetization of guarantee settlement (20) 848 903 Reserve for refunds to electric utility customers (16) 480 540 Overrecovered other postretirement benefit costs (23) 97 111 Other 368 388 Regulatory liabilities-noncurrent 10,346 10,187 Total regulatory liabilities $ 11,405 $ 10,996 (1) Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations. ( 2 ) Primarily ( 3 ) Reflects unrecovered gas costs at regulated gas operations, which are recovered 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. See Note 13 for more information. ( 5 ) 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. ( 6 ) 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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. ( 7 ) Reflects current portion of amounts to be recovered through retail rates in Virginia for payments Virginia Power expects to make to PJM through 2026 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter. (8) Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 9 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. ( 10 ) 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. ( 1 1 ) 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 September 30, 2021. ( 1 2 ) 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 years . (1 3 ) During the second quarter of 2021, DESC recorded a charge of $237 million ($178 million after-tax) in impairment of assets and other charges to write-off the balance of a regulatory asset that is no longer probable of recovery under the settlement agreement approved in DESC’s retail electric base rate case. See Note 13 for more information. (1 4 ) Primarily reflects legislation enacted in Virginia in 2019, which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 13 for additional information. (1 5 ) 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. Reflects an increase of $66 million associated with the revision of certain gas distribution pipeline AROs in the third quarter of 2021. See Note 2 for more information. (1 6 ) Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period effective February 2019, in connection with the SCANA Merger Approval Order. See Notes 3 and 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. (1 7 ) Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information. (1 8 ) 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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. (1 9 ) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will primarily 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 period ending in 2039 associated with the monetization of a bankruptcy settlement agreement. See Note 3 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. ( 2 1 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. (2 2 ) 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. (2 3 ) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. September 30, 2021 December 31, 2020 (millions) Virginia Power Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 147 $ — Deferred rider costs (2) 49 98 Deferred nuclear refueling outage costs (3) 70 53 PJM transmission rates (4) 9 71 Deferred early plant retirement charges (5) 226 — Derivatives (6) 153 40 Other 36 33 Regulatory assets-current 690 295 Deferred rider costs (2) 442 311 Interest rate hedges (7) 540 733 Ash pond and landfill closure costs (8) 2,361 2,301 Deferred cost of fuel used in electric generation (1) 139 — Deferred early plant retirement charges (5) 282 — Other 177 164 Regulatory assets-noncurrent 3,941 3,509 Total regulatory assets $ 4,631 $ 3,804 Regulatory liabilities: Deferred cost of fuel used in electric generation (1) $ 1 $ 58 Provision for future cost of removal (9) 152 152 Reserve for refunds to Virginia electric customers (10) 299 — Reserve for future credits to Virginia electric customers (11) — 120 Income taxes refundable through future rates (12) 54 54 Derivatives (6) 92 8 Other 87 33 Regulatory liabilities-current 685 425 Income taxes refundable through future rates (12) 2,356 2,404 Nuclear decommissioning trust (13) 1,958 1,719 Provision for future cost of removal (9) 1,042 980 Deferred cost of fuel used in electric generation (1) — 54 Reserve for refunds to Virginia electric customers (10) 31 — Other 173 181 Regulatory liabilities-noncurrent 5,560 5,338 Total regulatory liabilities $ 6,245 $ 5,763 (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. See Note 13 for more information. ( 3 ) 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. ( 4 ) Reflects current portion of amounts to be recovered through retail rates in Virginia for payments Virginia Power expects to make to PJM through 2026 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter. (5) Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 6 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. ( 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 25 years as of September 30, 2021. ( 8 ) Primarily reflects legislation enacted in Virginia in 2019, which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 13 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 ) Reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 1 1 ) Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information. ( 1 2 ) 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. (1 3 ) 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 September 30, 2021, Dominion Energy and Virginia Power regulatory assets include $4.5 billion and $3.3 billion, 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	9 Months Ended
	Sep. 30, 2021
Regulated Operations [Abstract]
Regulatory Matters	Note 13. Regulatory Matters 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. Other Regulatory Matters Other than the following matters, there have been no significant developments regarding the pending regulatory matters disclosed in Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Virginia Regulation 2021 Triennial Review In March 2021, Virginia Power filed its base rate case and accompanying schedules in support of the 2021 Triennial Review. In its filing, Virginia Power did not request an increase in base rates for generation and distribution services and proposed that base rates remain at their existing level. Virginia Power’s earnings test analysis, as filed, demonstrates it earned a combined ROE of 10.85% on its generation and distribution services for the test period, before accounting for forgiven customer balances. Pursuant to Virginia legislation, forgiven customer balances are excluded from the cost of service in determining test period revenues as part of the 2021 Triennial Review. To the extent that the Virginia Commission determines total earnings for the test period to be above Virginia Power’s authorized earnings band, the forgiven balance amounts are offset against the available revenues in the determination of any customer bill credits, or utilization of a CCRO. Virginia Commission approved investment amounts in qualifying solar or wind generation facilities or electric distribution grid transformation projects that Virginia Power elects to include as a CCRO under the GTSA. In its filing, Virginia Power elected to utilize $26 million of the Coastal Virginia Offshore Wind Pilot project investment as a CCRO to offset available revenues. Should the Virginia Commission determine that there are additional available revenues for earnings sharing, then Virginia Power has contingently elected to offset those revenues with additional Virginia Commission approved qualifying CCRO investments. shall not be set lower than the average of either (i) the returns reported for the three previous years by not less than a majority of comparable utilities in the Southeastern U.S., with certain limitations as described in the Regulation Act, or (ii) the authorized returns that are set by the applicable regulatory commissions for the same select peer group. testimony to reflect updated test period earnings, including an earned ROE of 10.42 %, before accounting for forgiven customer balances, and that no amount of eligible CCRO is necessary to be elected to be utilized. In the third and fourth quarters of 2020, Virginia Power recorded a net charge of $130 million related to the use of a CCRO in accordance with the GTSA, including a charge of $200 million ($149 million after-tax) in the third quarter of 2020, included in impairment of assets and other charges (benefits) in its Consolidated Statements of Income. In the first quarter of 2021, Virginia Power recorded a benefit of $130 million ($97 million after-tax) in impairment of assets and other charges (benefits) in its Consolidated Statements of Income to adjust its reserve related to the use of a CCRO in accordance with the GTSA. In October 2021, Virginia Power, the Virginia Commission staff and other parties filed a comprehensive settlement agreement with the Virginia Commission for approval. The comprehensive settlement agreement provides for $330 million in one-time refunds to customers made up of $255 million over a 6-month period and $75 million over three years, a $50 million going-forward base rate reduction and an authorized ROE of 9.35%. Additionally, Virginia Power has agreed to utilize $309 million of qualifying CCRO investments in the CVOW Pilot Project, deployment of AMI and a Customer Information Platform to offset available earnings and to amortize through 2023 the early retirement charges for coal- and oil-fired generation units recorded in 2019 and 2020. This matter is pending. In connection with the proposed settlement agreement, Virginia Power recorded in the third quarter of 2021 a $350 million ($261 million after-tax) charge for refunds to be provided to customers in operating revenues in its Consolidated Statements of Income as well as a $549 million ($409 million after-tax) benefit primarily from the establishment of a regulatory asset associated with the early retirements of certain coal- and oil-fired generating units and a $318 million ($237 million after-tax) charge for CCRO benefits provided to customers in impairment of assets and other charges (benefits) in its Consolidated Statements of Income. The amounts recorded reflect the impact related to jurisdictional customers as a result of the 2021 Triennial Review as well as the impact on certain non-jurisdictional customers which follow Virginia Power’s jurisdictional customer rate methodology. Utility Disconnection Moratorium Legislation In November 2020, legislation was enacted in Virginia relating to the moratorium on utility disconnections during the COVID-19 pandemic and resulted in Virginia Power forgiving Virginia jurisdictional retail electric customer balances that were more than 30 days past due as of September 30, 2020. As a result, Virginia Power recorded a charge of $127 million in the fourth quarter of 2020. In connection with the Virginia 2021 budget process, in the first quarter of 2021 Virginia Power recorded a charge of $76 million ($56 million after-tax) in impairment of assets and other charges (benefits) in its Consolidated Statements of Income for Virginia jurisdictional retail electric customer balances that were more than 30 days past due as of December 31, 2020 that Virginia Power is required to forgive. These forgiven customer balances are factored into Virginia Power’s 2021 Triennial Review as discussed above. Grid Transformation and Security Act of 2018 In June 2021, Virginia Power Virginia Fuel Expenses In May 2021, Virginia Power filed its annual fuel factor with the Virginia Commission to recover an estimated $1.4 billion in Virginia jurisdictional projected fuel expenses for the rate year beginning July 1, 2021 and $72 million of estimated net under-recovered balances Renewable Generation Projects In May 2020 and July 2020, Virginia Power entered into and closed on separate agreements to acquire Grassfield Solar, Norge Solar and Sycamore Solar. The projects are expected to cost approximately $170 million in aggregate once constructed, including the initial acquisition cost. The facilities are expected to generate 82 MW combined and be placed into service in 2022. In October 2020, Virginia Power filed an application with the Virginia Commission for CPCNs to construct and operate these projects as part of its efforts to meet the renewable generation development requirements under the VCEA. In April 2021, the Virginia Commission approved the application. In September 2021, Virginia Power filed a petition with the Virginia Commission for CPCNs to construct and operate 13 utility-scale projects totaling approximately 661 MW of solar generation and 70 MW of energy storage as part of its efforts to meet the renewable generation development requirements under the VCEA. The projects are expected to cost approximately $1.4 billion in the aggregate, excluding financing costs, and be placed into service between 2022 and 2023. This matter is pending. In November 2021, Virginia Power filed an application with the Virginia Commission requesting approval and certification of the Virginia Facilities component of the CVOW Commercial Project. The onshore Virginia Facilities have an estimated cost of approximately $1.1 billion, excluding financing costs, which is included within the overall cost of the CVOW Commercial Project. In addition, Virginia Power requested approval from the Virginia Commission to enter into financial hedges with U.S. financial institutions to mitigate the foreign currency exchange risk associated with certain supplier contracts associated with the CVOW Commercial Project. This matter is pending. Nuclear Life Extension Program In October 2021, Virginia Power filed a petition with the Virginia Commission requesting a determination that it is reasonable and prudent for Virginia Power to pursue a nuclear life extension program to extend the operating licenses of Surry and North Anna and to carry out projects to upgrade or replace systems and equipment necessary to continue to safely and reliably operate these nuclear power stations. The nuclear life extension program is expected to cost approximately $3.9 billion, excluding financing costs. This matter is pending. Riders Below is a discussion of significant riders associated with various Virginia Power projects: • 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 June 2020, Virginia Power proposed an $80 million total revenue requirement consisting of $44 million for previously approved phases and $36 million for phase five costs for Rider U for the rate year beginning April 1, 2021. This total revenue requirement represents a $28 million increase over the previous year. In February 2021, the Virginia Commission approved the filing . In June 2021, Virginia Power proposed a $96 million total revenue requirement consisting of $61 million for previously approved phases and $35 million for phase six costs for Rider U for the rate year beginning April 1, 2022. This total revenue requirement represents a $16 million increase over the previous year. This matter is pending. • Pursuant to Virginia legislation, Virginia Power can recover the costs related to the closure of CCR units. In February 2021, Virginia Power filed for approval of Rider CCR with a proposed $216 million revenue requirement for the rate year beginning December 1, 2021. • 10 • The Virginia Commission previously approved Rider T1 concerning transmission rates. In May 2021, Virginia Power proposed a $874 million total revenue requirement consisting of $493 million for the transmission component of Virginia Power’s base rates and $381 million for Rider T1 for the rate year beginning September 1, 2021. This total revenue requirement represents a $190 million decrease versus the revenues to be produced during the rate year under current rates. In August 2021, the Virginia Commission approved the filing. • • The Virginia Commission previously approved Rider GV relating to Greensville County. In June 2021, Virginia Power proposed a biennial update procedure for Rider GV with two consecutive rate years. The filing proposed a revenue requirement of $142 million for the rate year beginning April 1, 2022 and a revenue requirement of $127 million for the rate year beginning April 2023 • • The Virginia Commission previously approved Rider S relating to Virginia City Hybrid Energy Center. In June 2021, Virginia Power proposed a biennial update procedure for Rider S with two consecutive rate years. The filing proposed a revenue requirement of $192 million for the rate year beginning April 1, 2022 and a revenue requirement of $191 million for the rate year beginning April 1, 2023. This matter is pending. • Pursuant to Virginia legislation, Virginia Power can recover costs associated with participating in a market-based carbon trading program consistent with RGGI. In August 2021, the Virginia Commission approved Rider RGGI with a $168 million revenue requirement for the rate year beginning September 1, 2021, however, subsequently in August 2021, the Virginia Commission issued an order granting reconsideration and suspended its order approving the revenue requirement. This matter is pending. • Pursuant to Virginia legislation, Virginia Power can recover costs associated with electric distribution grid transformation projects that the Virginia Commission has approved as authorized by the GTSA. In August 2021, Virginia Power filed for approval of Rider GT with a proposed $ 56 million revenue requirement for the rate year beginning June 1, 2022. This matter is pending . • The Virginia Commission previously approved Riders C1A, C2A and C3A in connection with cost recovery for DSM programs. In December 2020, 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 $ 162 million cost cap, and proposed a total $ 78 million revenue requirement for the rate year beginning September 1, 2021. Virginia Power also requested approval to establish a new Rider C4A in connection with cost recovery for DSM programs. In September 2021, the Virginia Commission approved a total revenue requirement of $74 million, which represents a $14 million increase over the previous year. The Virginia Commission also established Rider C4A. • In September 2021, Virginia Power applied for approval of Rider CE associated with solar generation and energy storage projects requested for approval in September 2021, solar generation projects approved in April 2021 and certain small-scale solar projects with a proposed $71 million total revenue requirement for the rate year beginning May 1, 2022. This total revenue requirement represents a $61 million increase over the previous year. This matter is pending. • The Virginia Commission previously approved Rider BW relating to Brunswick County power station. In October 2021, Virginia Power proposed a biennial update procedure for Rider BW with two consecutive rate years. The filing proposed a revenue requirement of $ 145 million for the rate year beginning September 1, 2022 and a revenue requirement of $ 120 million for the rate year beginning September 1, 2023 . This matter is pending. • In October 2021, Virginia Power filed a petition with the Virginia Commission for Rider SNA associated with costs relating to the preparation of the applications for subsequent license renewal to the NRC to extend the operating licenses of Surry and North Anna and related projects. Virginia Power requested approval of a cost recovery of approximately $1.2 billion through Rider SNA for the first phase of nuclear life extension program which includes investments through 2024 and proposed a $109 million revenue requirement for the rate year beginning September 1, 2022. This matter is pending. • In November 2021, Virginia Power filed an application with the Virginia Commission requesting approval of Rider OSW associated with costs incurred to construct, own and operate the CVOW Commercial Project. The filing proposed a revenue requirement of $79 million for the rate year beginning September 1, 2022. This matter is pending. Additional significant riders associated with various Virginia Power projects are as follows: Rider Name Application Date Approval Date Rate Year Beginning Total Revenue Requirement (millions) Increase (Decrease) Over Previous Year (millions) Rider B June 2020 February 2021 April 2021 $ 24 $ (8 ) Rider GV June 2020 February 2021 April 2021 153 21 Rider R June 2020 February 2021 April 2021 58 14 Rider S June 2020 February 2021 April 2021 194 (1 ) Rider W June 2020 February 2021 April 2021 120 14 Rider US-3 July 2020 March 2021 June 2021 38 10 Rider US-4 July 2020 March 2021 June 2021 10 3 Rider BW October 2020 July 2021 September 2021 113 14 Rider US-2 October 2020 July 2021 September 2021 9 — Rider E January 2021 September 2021 November 2021 67 (18 ) Rider B June 2021 Pending April 2022 16 (8 ) Rider W June 2021 Pending April 2022 121 1 Rider US-3 August 2021 Pending June 2022 50 12 Rider US-4 August 2021 Pending June 2022 15 5 Rider US-2 October 2021 Pending September 2022 11 2 Electric Transmission Projects Description and Location of Project Application Date Approval Date Type of Line Miles of Lines Cost Estimate (millions) Rebuild Clubhouse-Dry Bread Line and Dry Bread-Lakeview Line in Greensville County, Virginia November 2020 July 2021 230 kV 13 $ 25 Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia April 2021 Pending 500 kV 26 95 Beaumeade-Belmont reconductor and rebuild projects in the County of Loudoun, Virginia May 2021 Pending 230 kV 7 15 Extension to Cloud Switching Station and Easters Switching Station in the County of Mecklenburg, Virginia June 2021 Pending 230 kV 15 105 North Carolina Regulation Virginia Power North Carolina Fuel Filing In August 2021, Virginia Power submitted its annual filing to the North Carolina Commission to adjust the fuel component of its electric rates. Virginia Power updated its filing in October 2021 to reflect the increased commodity cost of fuel and proposed a total $26 million increase to the fuel component of its electric rates for the rate year beginning February 1, 2022. This matter is pending. PSNC Base Rate Case In April 2021, PSNC filed its general rate case application, direct testimony, exhibits, and schedules with the North Carolina Commission. PSNC proposed a non-fuel, base rate increase of $53 million to be effective November 1, 2021. After considering the benefits of the 2017 Tax Reform Act, the net revenue increase to customers would be approximately $42 million. The base rate increase was proposed to recover the significant investment in infrastructure to serve a growing customer base, improve safety and reliability of the transmission and distribution system and enhance energy efficiency and sustainability. The proposed rates would provide for an ROE of 10.25% compared to the currently authorized ROE of 9.7%. In October 2021, PSNC, the North Carolina Commission public staff and certain other parties of record filed a stipulation of settlement with the North Carolina Commission for approval. The stipulation of settlement provides for a non-fuel, base rate increase of $29 million effective November 1, 2021, based on an ROE of 9.60%. The net revenue increase to customers, after considering the amortization of the previously deferred benefits of the 2017 Tax Reform Act, would be $4 million in the initial rate year, $23 million for the following rate year and then $25 million beginning for the third through fifth rate years. In addition, the stipulation of settlement provides for the recovery, over four years, of $106 million of operation and maintenance costs which PSNC has incurred and deferred through June 2021 to comply with federal standards for pipeline integrity and safety. In November 2021, PSNC implemented temporary rates consistent with the stipulation of settlement. If the North Carolina Commission deems the temporary rates excessive in the final order, the excess amount along with interest will be refunded to customers. This matter is pending. Pipeline Integrity and Safety Program The North Carolina Commission has authorized PSNC to use a tracker mechanism to recover the incurred capital investment and associated costs of complying with federal standards for pipeline integrity and safety requirements that are not in current base rates. In September 2021, the North Carolina Commission approved PSNC’s request to increase the integrity management annual revenue requirement to $34 million, an increase of $1 million over its previous filing, effective October 2021. Rider D Rider D allows PSNC to recover from customers all prudently incurred gas costs and certain related uncollectible expenses as well as losses on negotiated gas and transportation sales. In September 2021, PSNC submitted a filing with the North Carolina Commission for a $61 million gas cost increase. The North Carolina Commission approved the filing in September 2021 with rates effective October 2021. South Carolina Regulation South Carolina Electric Base Rate Case In August 2020, DESC filed its retail electric base rate case and schedules with the South Carolina Commission. DESC proposed a non-fuel, base rate increase of $ 178 million, or 7.75 %, based on an adjusted test year data, effective on or after the first billing cycle of March 2021. The base rate increase was proposed to recover the significant investment in assets and operating resources required to serve an expanding customer base, maintain the safety, reliability and efficiency of DESC’s system and meet increasingly stringent reliability, security and environmental requirements for the benefit of South Carolina customers. DESC presented an earned ROE of 5.90 % based upon a fully-adjusted test period. The proposed rates would provide for an earned ROE equal to the current authorized earned ROE of 10.25 % established in the previous rate case in 2012. In January 2021, the South Carolina Commission approved a proposal made by the South Carolina Office of Regulatory Staff, and agreed to by DESC and other intervenors, to stay the base rate case due to the current economic conditions and to allow the parties more time to negotiate a settlement with a final order to be issued no later than August 2021. In July 2021, DESC, the South Carolina Office of Regulatory Staff and other parties of record filed a comprehensive settlement agreement with the South Carolina Commission for approval. The comprehensive settlement agreement provides for a $36 DESC has agreed to a retail electric base rate case prior to July 1, 2023, such that new rates would not be effective prior to January 1, 2024, absent unforeseen extraordinary economic or financial conditions that may include changes in corporate tax rates. In July 2021, the South Carolina Commission approved the comprehensive settlement agreement and issued its final order in August 2021. In connection with this matter, in the second quarter of 2021, Dominion Energy recorded charges of $249 million ($187 million after-tax) reflected within impairment of assets and other charges (benefits), including $237 million of regulatory assets associated with DESC’s purchases of its first mortgage bonds during 2019 that are no longer probable of recovery under the settlement agreement, and $18 million ($14 million after-tax) reflected within other income in its Consolidated Statements of Income. DSM Programs DESC has approval for a DSM rider through which it recovers expenditures related to its DSM programs. In January 2021, DESC filed an application with the South Carolina Commission seeking approval to recover $48 million of costs and net lost revenues associated with these programs, along with an incentive to invest in such programs. In April 2021, the South Carolina Commission approved the filing. In connection with the approval of the comprehensive settlement agreement in the South Carolina base rate case discussed above, the net lost revenue component of the DSM rider was adjusted resulting in a recovery of $43 million commencing with bills issued on September 1, 2021. 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. Natural Gas Rates In June 2021, DESC filed with the South Carolina Commission its monitoring report for the 12-month period ended March 31, 2021 with a total revenue requirement of $426 million. This represents a $9 million overall annual increase to its natural gas rates under the terms of the Natural Gas Rate Stabilization Act effective with the first billing cycle of November 2021. In October 2021, the South Carolina Commission issued an order approving a total revenue requirement of $424 million effective with the first billing cycle of November 2021. This represents a $7 million overall annual increase to DESC’s natural gas rates. Ohio Regulation PIR Program In 2008, East Ohio began PIR, aimed at replacing approximately 25% of its pipeline system. In April 2021, the Ohio Commission approved East Ohio’s application to adjust the PIR cost recovery rates for 2020 costs. The filing reflects gross plant investment for 2020 of $178 million, cumulative gross plant investment of $2.0 billion and an annual revenue requirement of $243 million. CEP Program In 2011, East Ohio began CEP which enables East Ohio to defer depreciation expense, property tax expense and carrying costs associated with CEP investments. In April 2021, East Ohio filed an application requesting approval to adjust the CEP cost recovery rates for 2019 and 2020 costs. The filing reflects gross plant investment for 2019 of $137 million, gross plant investment for 2020 of $99 million, cumulative gross plant investment of $957 million and a revenue requirement of $119 million. This matter is pending. UEX Rider East Ohio has approval for a UEX Rider through which it recovers the bad debt expense of most customers not participating in the PIPP Plus Program. The UEX Rider is adjusted annually to achieve dollar for dollar recovery of East Ohio’s actual write-offs of uncollectible amounts. In July 2021, the Ohio Commission approved East Ohio’s application to adjust its UEX Rider to reflect an increased annual revenue requirement of $ 20 million to provide for an under -recovered accumulated bad debt expense of $ 7 million as of March 31, 2021, and recovery of net bad debt expense projected to total $ 13 million for the twelve-month period ending March 2022 . West Virginia Regulation West Virginia Base Rate Case In September 2020, Hope filed its base rate case and schedules with the West Virginia Commission. Hope proposed a non-fuel, base rate increase of $28 million. The base rate increase was proposed to recover the significant investment in distribution infrastructure and costs associated with the acquisition of over 2,000 miles of gathering assets, both for the benefit of West Virginia customers. The proposed rates would provide for an ROE of 10.25% compared to the authorized ROE of 9.45%. In July 2021, the West Virginia Commission approved a non-fuel, base rate increase of $13 million for rates effective July 2021 with an ROE of 9.54%. In August 2021, Hope filed a petition for reconsideration with the West Virginia Commission regarding certain return calculations included in the July 2021 approval order. PREP In May 2021, Hope filed a PREP application with the West Virginia Commission requesting approval to recover PREP costs related to $54 million and $56 million of projected capital investment for 2021 and 2022, respectively. The application also includes a true-up of PREP costs related to the 2020 actual capital investment of $34 million and sets forth $9 million of annual PREP costs to be recovered in proposed rates effective November 1, 2021. In October 2021, the West Virginia Commission approved the request. Utah Regulation Purchased Gas In May 2021, the Utah Commission approved Questar Gas’ request for a $43 million gas cost increase with rates effective June 2021. In October 2021, the Utah Commission approved Questar Gas’ request for an $83 million gas cost increase with rates effective November 2021.

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Note 14. Leases Other than the items discussed below, there have been no significant changes regarding the Companies’ leases as described in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Dominion Energy’s Consolidated Statements of Income include $58 million and $147 million for the three and nine months ended September 30, 2021, respectively, and $61 million and $146 million for the three and nine months ended September 30, 2020, respectively, of rental revenue included in operating revenue. Dominion Energy’s Consolidated Statements of Income include $29 million and $87 million for the three and nine months ended September 30, 2021, respectively, and $26 million and $76 million for the three and nine months ended September 30, 2020, respectively, of depreciation expense included in depreciation, depletion and amortization, related to facilities subject to power purchase agreements under which Dominion Energy is the lessor. Corporate Office Leasing Arrangement In December 2019, Dominion Energy signed an agreement with a lessor, as amended in May 2020, to construct and lease a new corporate office property in Richmond, Virginia. The lessor provided equity and had obtained financing commitments from debt investors, totaling $465 million, to fund the estimated project costs. In March 2021, Dominion Energy notified the lessor of its intention to terminate the leasing arrangement effective April 2021. As a result, Dominion Energy recorded a charge of $71 million ($53 million after-tax) in the first quarter of 2021, included in impairments of assets and other charges in its Consolidated Statements of Income, primarily for amounts required to be repaid to the lessor.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 15. Variable Interest Entities There have been no significant changes regarding the entities the Companies consider VIEs as described in Note 16 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Dominion Energy Dominion Energy’s Consolidated Balance Sheets include $264 million presented in current liabilities held for sale at September 30, 2021 as well as $32 million presented in securities due within one year and $239 million presented in long-term debt at December 31, 2020, for debt issued by SBL Holdco, a VIE, net of issuance costs, that is nonrecourse to Dominion Energy and is secured by SBL Holdco’s interest in certain nonregulated solar facilities. Virginia Power Virginia Power purchased shared services from DES, an affiliated VIE, of $89 million and $81 million for the three months ended September 30, 2021 and 2020, respectively, and $278 million and $260 million for the nine months ended September 30, 2021 and 2020, respectively. Virginia Power’s Consolidated Balance Sheets include amounts due to DES of $24 million and $175 million at September 30, 2021 and December 31, 2020, respectively, recorded in payables to affiliates.

Significant Financing Transacti

Significant Financing Transactions	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Significant Financing Transactions	Note 16. Significant Financing Transactions Credit Facilities and Short-term Debt 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 In June 2021, Dominion Energy amended its $6.0 billion joint revolving credit facility to provide for a discount in the pricing of certain annual fees and amounts borrowed by Dominion Energy under the facility if Dominion Energy achieves certain annual renewable electric generation and diversity and inclusion objectives. In addition, the amended facility incorporates certain administrative changes with respect to the anticipated transition from LIBOR to an alternative benchmark rate. The key financial covenants are unchanged from the previous facility. At September 30, 2021, Dominion Energy’s commercial paper and letters of credit outstanding, as well as its capacity available under the credit facility, were as follows: Facility Limit Outstanding Commercial Paper Outstanding Letters of Credit Facility Capacity Available (millions) Joint revolving credit facility (1) $ 6,000 $ 3,494 $ 99 $ 2,407 (1) This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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. DESC and Questar Gas’ short-term financings are supported through access as co-borrowers to the joint revolving credit facility discussed above with the Companies. At September 30, 2021, the sub-limits for DESC and Questar Gas were $500 million and $250 million, respectively. In January 2021, DESC and GENCO applied to FERC for a two-year short-term borrowing authorization. In March 2021, FERC granted DESC authority through March 2023 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 March 2021, FERC granted GENCO authority through March 2023 to issue short-term indebtedness not to exceed $200 million outstanding with maturity dates of one year or less. In addition to the credit facilities mentioned above, Dominion Energy also has a credit facility which allows Dominion Energy to issue up to approximately $30 million in letters of credit and matures in June 2022 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 March 2020, Dominion Energy entered into a $900 million 364-Day Revolving Credit Agreement that bore interest at a variable rate. At December 31, 2020, $225 million was outstanding under the agreement. In March 2021, the agreement reached maturity and Dominion Energy repaid the outstanding borrowed amount in full. In July 2021, Dominion Energy entered into an approximately $1.3 billion term loan credit agreement following the termination of the Q-Pipe Transaction as discussed in Note 3. Dominion Energy has an effective shelf registration statement with the SEC for the sale of up to $3.0 billion of variable denomination floating rate demand notes, called Dominion Energy Reliability SM At September 30, 2021 and December 31, 2020, Dominion Energy’s Consolidated Balance Sheets include $391 million and $268 million, respectively, with respect to such notes presented within short-term debt. The proceeds are used for general corporate purposes and to repay debt. Virginia Power Virginia Power’s short-term financing is supported through its access as co-borrower to Dominion Energy’s $6.0 billion joint revolving credit facility, as amended in June 2021. The facility can be used for working capital, as support for the combined commercial paper programs of Virginia Power, Dominion Energy, Questar Gas and DESC and for other general corporate purposes. At September 30, 2021, Virginia Power’s share of commercial paper and letters of credit outstanding under the joint revolving credit facility with Dominion Energy, Questar Gas and DESC was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 6,000 $ 896 $ 12 (1) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At September 30, 2021, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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. Long-term Debt Unless otherwise noted, the proceeds of long-term debt issuances were used for general corporate purposes and/or to repay short-term debt. In March 2021, PSNC issued, through private placement, $150 million of 3.10% senior notes that mature in 2051. In April 2021, Dominion Energy issued $600 million of 1.45% senior notes and $500 million of 3.30% senior notes that mature in 2026 and 2041, respectively. In June 2021, Dominion Energy entered into a $900 million Sustainability Revolving Credit Agreement. This supplemental credit facility, which matures in June 2024 In July 2021, DESC redeemed the remaining principal outstanding of $30 million of its 3.22% first mortgage bonds, plus accrued interest. The bonds would have otherwise matured in October 2021. In July 2021, Dominion Energy redeemed the remaining principal outstanding of $400 million of its 2.0% senior notes, plus accrued interest. The notes would have otherwise matured in August 2021. In August 2021, Dominion Energy issued $1.0 billion of 2.25% senior notes that mature in 2031 In August 2021, Dominion Energy redeemed the remaining principal outstanding of $800 million of its July 2016 hybrids, which matured in 2076 and were listed on the NYSE under the symbol DRUA. Expenses related to the early redemption of the hybrids were $23 million reflected within interest and related charges in the Consolidated Statements of Income for the three and nine months ended September 30, 2021. In August 2021, Questar Gas issued through private placements $125 million of 2.21% senior notes In November 2021, Virginia Power provided notice to redeem its 2.95% senior notes, which would have otherwise matured in January 2022, at the remaining principal outstanding of $450 million plus accrued interest. Derivative Restructuring In June 2020, Dominion Energy amended a portfolio of interest rate swaps with a notional value of $2.0 billion, extending the mandatory termination dates from 2020 and 2021 to December 2024. As a result of this noncash financing activity with an embedded interest rate swap, Dominion Energy recorded $326 million in other long-term debt representing the net present value of the initial fair value measurement of the new contract as discussed in Note 18 to the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Dominion Energy settled certain of the outstanding interest rate swaps which would have otherwise matured in December 2024, resulting in a million reduction in other long-term debt. In August 2020, Virginia Power amended a portfolio of interest rate swaps with a notional value of $900 million, extending the mandatory termination dates from 2020 to December 2023. As a result of this noncash financing activity with an embedded interest rate swap, Virginia Power recorded $443 million in other long-term debt representing the net present value of the initial fair value measurement of the new contract as discussed in Note 18 to the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. Preferred Stock Dominion Energy is authorized to issue up to 20 million shares of preferred stock, which may be designated into separate classes. At both September 30, 2021 and December 31, 2020, Dominion Energy had issued and outstanding 2.4 million shares of 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. Dominion Energy recorded dividends of $7 million ($4.375 per share) for both the three months ended September 30, 2021 and 2020, and $21 million ($13.125 per share) for both the nine months ended September 30, 2021 and 2020, on the Series A Preferred Stock. Dominion Energy also recorded dividends of $9 million ($11.625 per share) for both the three months ended September 30, 2021 and 2020, and $27 million ($34.875 per share) for both the nine months ended September 30, 2021 and 2020, on Series B Preferred Stock. The stock purchase contract liability associated with Dominion Energy’s 2019 Equity Units was $65 million and $129 million at September 30, 2021 and December 31, 2020, respectively. Stock purchase contract payments of $64 million and $62 million were made during the nine months ended September 30, 2021 and 2020, respectively. In calculating diluted EPS, Dominion Energy applies the treasury stock method to the stock purchase contracts and the if-converted method to the Series A Preferred Stock. There have been no significant changes to Dominion Energy’s Series A Preferred Stock and Series B Preferred Stock as described in Note 19 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020, other than the item described below. Series A Preferred Stock – Conversion Settlement Modification In November 2021, Dominion Energy’s Articles of Incorporation were amended to require that any conversion of its Series A Preferred Stock be settled, at Dominion Energy’s election, either entirely in cash or in cash up to the first $1,000 per share and in shares of Dominion Energy common stock, cash or any combination thereof for any amounts in excess of $1,000 per share. As a result of establishing a minimum amount to be settled in cash if the holders elect to convert the Series A Preferred Stock, $1.6 billion will be reclassified from equity to mezzanine equity in the fourth quarter of 2021. Issuance of Common Stock Dominion Energy recorded, net of fees and commissions, $292 million from the issuance of 4 million shares of common stock for the nine months ended September 30, 2021 and $481 million from the issuance of 6.2 million shares of common stock for the nine months ended September 30, 2020, through various programs including Dominion Energy Direct® and employee savings plans, as well as settlements of litigation as described in Note 20 to the Consolidated Financial Statements to the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. In July 2021, Dominion Energy issued 1.4 million shares of its common stock, valued at $104 million, to satisfy DESC’s obligation under a settlement agreement for the FILOT litigation discussed in Note 17. In August 2021, Dominion Energy issued 0.6 million shares of its common stock, valued at $45 million, to satisfy DESC’s obligation for the initial payment under a settlement agreement with the SCDOR discussed in Note 17. In September 2020, Dominion Energy issued 4.1 million shares of its common stock to satisfy its obligation under a settlement agreement for the Santee Cooper Ratepayer Case discussed in Note 17. These shares were immediately repurchased as discussed below. At-the-Market Program In August 2020, Dominion Energy entered into sales agency agreements to effect sales under an at-the-market program as discussed in Note 20 to the Consolidated Financial Statements in the Companies’ Annual Report Form 10-K for the year ended December 31, 2020. As of September 30, 2021, Dominion Energy has not issued any shares or entered into any forward sale agreements under this program. Repurchase of Common Stock In November 2020, the Board of Directors authorized the repurchase of up to $1.0 billion of Dominion Energy’s common stock in addition to the $3.0 billion repurchase program authorized in July 2020 and completed in December 2020 as discussed in Note 20 to the Consolidated Financial Statements in the Companies’ Annual Report Form 10-K for the year ended December 31, 2020 . Dominion Energy did not repurchase any shares of common stock during the nine months ended September 30, 2021

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 17. 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 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 meet applicable 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. Ozone Standards The EPA published final non-attainment designations for the October 2015 ozone standard in June 2018 with states required to develop plans to address the new standard. Until the states have developed implementation plans for the standard, the Companies are unable to predict whether or to what extent the new rules will ultimately require additional controls. The expenditures required to implement additional controls could have a material impact on the Companies’ results of operations and cash flows. 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. The ACE Rule regulated GHG emissions from existing coal-fired power plants pursuant to Section 111(d) of the CAA and required states to develop plans by July 2022 establishing unit-specific performance standards for existing coal-fired power plants. In January 2021, the U.S. Court of Appeals for the D.C. Circuit vacated the ACE Rule and remanded it to the EPA. This decision would take effect upon issuance of the court’s mandate. In March 2021, the court issued a partial mandate vacating and remanding all parts of the ACE Rule except for the portion of the ACE Rule that repealed the Clean Power Plan. In October 2021, the U.S. Supreme Court agreed to hear a challenge of the U.S. Court of Appeals for the D.C. Circuit’s decision on the ACE Rule. While the EPA has stated its intention to replace the ACE Rule, it is unknown at this time if or how the EPA will issue a replacement for the ACE Rule and how that replacement will affect the Companies’ operations, financial condition and/or cash flows. 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, or conventional, pollutants that are regulated by the New Source Review program, and exceed a significant emissions rate of 75,000 tons per year of CO 2 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 best operating practices. In January 2021, the EPA published a final rule affirming that fossil fuel-fired electric generating units meet the requirement that a source category “significantly contribute” to endangering air pollution for the purposes of regulating GHG emissions from new, modified and reconstructed stationary sources. The January 2021 rule also established a threshold for the “significant contribution” threshold that would have meant that no other source category, such as oil and gas facilities, petroleum refineries, and boilers, would meet that requirement at this time. In April 2021, the U.S. Court of Appeals for the D.C. Circuit granted an unopposed motion by the EPA to vacate and remand the January 2021 rule. The proposed revision to the performance standards for coal-fired steam generating units remains pending. Until the EPA ultimately takes final action on this rulemaking, the Companies cannot predict the impact to their results of operations, financial condition and/or cash flows. 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 entrainment technology determinations after an examination of five mandatory facility-specific factors, including a social cost-benefit test, and six optional facility-specific factors. The rule governs all electric generating stations with water withdrawals above two MGD, with a heightened entrainment analysis for those facilities over 125 MGD. Dominion Energy and Virginia Power currently have 15 and nine facilities, respectively, that are subject to the final regulations. Dominion Energy is also working with the EPA and state regulatory agencies to assess the applicability of Section 316(b) to eight hydroelectric facilities, including three Virginia Power facilities. The Companies anticipate that they may have to install impingement control technologies at certain of these stations that have once-through cooling systems. The Companies are currently evaluating the need or potential for entrainment controls under the final rule as these decisions will be made on a case-by-case basis after a thorough review of detailed biological, technology, cost and benefit studies. DESC is conducting studies and implementing plans as required by the rule to determine appropriate intake structure modifications at certain facilities to ensure compliance with this rule. While the impacts of this rule could be material to the Companies’ 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. 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 established 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 was December 2023 . . While the impacts of this rule could be material to the Companies’ 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, the Companies 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 12 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 remediation plans associated with three sites, including one at Virginia Power, and expects to commence remediation activities in 2021 or 2022 depending on receipt of final permits and approvals. At September 30, 2021 and December 31, 2020, Dominion Energy had $40 million and $42 million, respectively, and Virginia Power had $25 million and $26 million, respectively, of reserves recorded. In addition, for one site associated with Dominion Energy, an updated work plan submitted to SCDHEC in September 2018, would increase costs by approximately $11 million if approved by federal and state agencies. In September 2020, this plan was submitted to the Army Corps of Engineers. Dominion Energy is associated with 12 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, the Companies are unable to make an estimate of the potential financial statement impacts. 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. 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 at September 30, 2021 and December 31, 2020 include reserves of $196 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). The plaintiffs alleged, 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. In December 2018, the State Court of Common Pleas in Hampton County entered an order granting preliminary approval of a class action settlement. The court entered an order granting final approval of the settlement in June 2019, which became effective in July 2019. The settlement agreement, contingent upon the closing of the SCANA Combination, provided that SCANA and DESC establish an escrow account and proceeds from the escrow account would be distributed to the plaintiffs, after payment of certain taxes, attorneys' fees and other expenses and administrative costs. The escrow account would include (1) up to $2.0 billion, net of a credit of up to $2.0 billion in future electric bill relief, which would inure to the benefit of the escrow account in favor of class members over a period of time established by the South Carolina Commission in its order related to matters before the South Carolina Commission related to the NND Project, (2) a cash payment of $115 million and (3) the transfer of certain DESC-owned real estate or sales proceeds from the sale of such properties, which counsel for the plaintiffs estimated to have an aggregate value between $60 million and $85 million. At the closing of the SCANA Combination, SCANA and DESC funded the cash payment portion of the escrow account. In July 2019, DESC transferred $117 million representing the cash payment, plus accrued interest, to the plaintiffs. Through August 2020, property, plant and equipment with a net recorded value of $27 million had been transferred to the plaintiffs in coordination with the court-appointed real estate trustee to satisfy the settlement agreement. In September 2020, the court entered an order approving a final resolution of the transfer of real estate or sales proceeds with a cash contribution of $38.5 million by DESC and the conveyance of property, plant and equipment with a net recorded value of $3 million, which was completed by DESC in October 2020. 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 were substantially similar to those in the DESC Ratepayer Case. In March 2020, the parties executed a settlement agreement relating to this matter as well as the Luquire Case and the Glibowski Case described below. The settlement agreement provided that Dominion Energy and Santee Cooper establish a fund for the benefit of class members in the amount of $520 million, of which Dominion Energy’s portion was $320 million of shares of Dominion Energy common stock. In July 2020, the court issued a final approval of the settlement agreement. In September 2020, Dominion Energy issued $322 million of shares of Dominion Energy common stock to satisfy its obligation under the settlement agreement, including interest charges. 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 were similar to the Santee Cooper Ratepayer Case. In March 2020, the parties executed a settlement agreement as described above relating to this matter as well as the Santee Cooper Ratepayer Case and the Glibowski Case. This case was dismissed as part of the Santee Cooper Ratepayer Case settlement described above. 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 alleged, 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. In March 2020, the parties executed a settlement agreement as described above relating to this matter as well as the Santee Cooper Ratepayer Case and the Luquire Case. This case was dismissed as part of the Santee Cooper Ratepayer Case settlement described above. 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 (collectively the SCANA Securities Class Action). 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 alleged, among other things, that the defendants violated §10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder, and that the individually named defendants are liable under §20(a) of the same act. In December 2019, the parties executed a settlement agreement pursuant to which SCANA would pay $192.5 million, up to $32.5 million of which could be satisfied through the issuance of shares of Dominion Energy common stock, subject to court approval. 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, and granted final approval in July 2020. In March 2020, SCANA funded an escrow account with $160 million in cash and paid the balance of $32.5 million in cash in August 2020 to satisfy the settlement. 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 (the State Court Derivative Case). 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. In January 2019, the defendants filed a motion to dismiss the consolidated action. In February 2019, one action was voluntarily dismissed. In March 2020, the court denied the defendants’ motion to dismiss. In April 2020, the defendants filed a notice of appeal with the South Carolina Court of Appeals and a petition with the Supreme Court of South Carolina seeking appellate review of the denial of the motion to dismiss. In June 2020, the plaintiffs filed a motion to dismiss the appeal with the South Carolina Court of Appeals, which was granted in July 2020. In August 2020, the Supreme Court of South Carolina denied the defendants’ petition seeking appellate review. Also in August 2020, the defendants filed a petition for rehearing with the South Carolina Court of Appeals relating to the July 2020 ruling by the court, which was denied in October 2020. In November 2020, SCANA filed a petition of certiorari with the Supreme Court of South Carolina seeking appellate review of the denial of SCANA’s motion to dismiss. This petition was denied in June 2021. Also in June 2021, the parties reached an agreement in principle in the amount of $33 million to resolve this matter, subject to court approval. This settlement was reached in contemplation of and will be utilized to satisfy a portion of the Federal Court Merger Case and the State Court Merger Case discussed below. 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, 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 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 (the Federal Court Merger Case). 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 as well as an inseparable fraud claim. In November 2019, the defendants filed a motion to dismiss. In April 2020, the U.S. District Court for the District of South Carolina denied the motion to dismiss. In May 2020, SCANA filed a motion to intervene, which was denied in August 2020. In September 2020, SCANA filed a notice of appeal with the U.S. Court of Appeals for the Fourth Circuit. In June 2021, the parties reached an agreement in principle in the amount of $ 63 million to resolve this matter as well as the State Court Merger Case described below, subject to court approval. This settlement was reached in contemplation of and will be partially satisfied by the State Court Derivative Case settlement described above. 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 State Court Merger Case). The plaintiff alleges, 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 secure and obtain the best price for the sale of SCANA. Also in May 2019, the case was removed to the U.S. District Court of South Carolina by the non-South Carolina defendants. In June 2019, the plaintiffs filed a motion to remand the case to state court. In January 2020, the case was remanded to state court. In February 2020, the defendants filed a motion to dismiss. In June 2021, the parties reached an agreement in principle as described above relating to this matter as well as the Federal Court Merger Case and the State Court Derivative Case. 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 January 2021, the U.S. District Court for the District of South Carolina granted summary judgment in favor of SCANA, DESC, Fluor Corporation and Fluor Enterprises, Inc. In February 2021, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fourth Circuit. This case is pending. 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. This case is 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. In July 2021, the parties executed a settlement agreement requiring DESC to pay $99 million, which could be satisfied in either cash or shares of Dominion Energy common stock. Also in July 2021, the State Court of Common Pleas in Fairfield County, South Carolina approved the settlement. In July 2021, Dominion Energy issued 1.4 million shares of Dominion Energy common stock to satisfy DESC’s obligation under the settlement agreement. 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. In December 2020, the parties reached an agreement in principle in the amount of $165 million to resolve this matter. In June 2021, the parties executed a settlement agreement which allows DESC to fund the settlement amount through a combination of cash, shares of Dominion Energy common stock or real estate with an initial payment of at least $43 million in shares of Dominion Energy common stock. In August 2021, Dominion Energy issued 0.6 million shares of its common stock to satisfy DESC’s obligation for the initial payment under the settlement agreement. 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 April 2020, SCANA and DESC reached an agreement in principle with the Staff of the SEC’s Division of Enforcement to settle, without admitting or denying the allegations in the complaint. South Carolina issued an order approving the settlement which required SCANA to pay a civil monetary penalty totaling $ 25 million, and SCANA and DESC to pay disgorgement and prejudgment interest totaling $ 112.5 million, which disgorgement and prejudgment interest amount were deemed satisfied by the settlements in the SCANA Securities Class Action and the DESC Ratepayer Case. SCANA paid the civil penalty in December 2020. The SEC civil action against two former executive officers of SCANA remains pending and is currently subject to a stay granted by the court in June 2020 at the request of the U.S. Attorney’s Office for the District of South Carolina. In addition, the South Carolina Law Enforcement Division is conducting a criminal investigation into the handling of the NND Project by SCANA and DESC. Dominion Energy is cooperating fully with the investigations by the U.S. Attorney’s Office and the South Carolina Law Enforcement Division, including responding to additional subpoenas and document requests. Dominion Energy has also entered into a cooperation agreement with the U.S. Attorney’s Office and the South Carolina Attorney General’s Office. The cooperation agreement provides that in consideration of its full cooperation with these investigations to the satisfaction of both agencies, neither such agency will criminally prosecute or bring any civil action against Dominion Energy or any of its current, previous, or future direct or indirect subsidiaries related to the NND Project. A former executive

Credit Risk

Credit Risk	9 Months Ended
	Sep. 30, 2021
Risks And Uncertainties [Abstract]
Credit Risk	Note 18. Credit Risk The Companies’ accounting policies for credit risk are discussed in Note 24 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 At September 30, 2021, Dominion Energy’s credit exposure totaled $177 million, primarily related to price risk management activities. Of this amount, investment grade counterparties, including those internally rated, represented 91%. No single counterparty, whether investment grade or non-investment grade, exceeded $51 million of exposure. At September 30, 2021, Virginia Power’s exposure related to wholesale customers totaled $10 million. Of this amount, investment grade counterparties, including those internally rated, represented 80%. No single counterparty, whether investment grade or non-investment grade, exceeded $4 million of exposure. Credit-Related Contingent Provisions Certain 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 September 30, 2021 and December 31, 2020, Dominion Energy would have been required to post $102 million and $14 million, respectively, of additional 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 contracts and derivatives elected under the normal purchases and normal sales exception, per contractual terms. Dominion Energy had posted $90 million and $1 million of collateral at September 30, 2021 and December 31, 2020, respectively, related to derivatives with credit-related contingent provisions that are in a liability position and not fully collateralized with cash. The aggregate fair value of all derivative instruments with credit-related contingent provisions that are in a liability position and not fully collateralized with cash was $192 million and $15 million at September 30, 2021 and December 31, 2020, respectively, which does not include the impact of any offsetting asset positions. Certain of Virginia Power’s derivative instruments contain credit-related contingent provisions. These provisions require Virginia Power to provide collateral upon the occurrence of specific events, primarily a credit rate 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 September 30, 2021 and December 31, 2020, Virginia Power would have been required to post an additional $40 million and $2 million, respectively of additional collateral to its counterparties. The collateral that would be required to be posted includes the impacts of any offsetting asset position and any amounts already posted for derivatives and non-derivative contracts, per contractual terms. Virginia Power had posted $79 million of collateral at September 30, 2021 related to derivatives with credit-related contingent provisions that are in a liability position and not fully collateralized with cash. No such amounts were posted at December 31, 2020. The aggregate fair value of all derivative instruments with credit-related contingent provisions that are in a liability position and not fully collateralized with cash was $119 million and $2 million at September 30, 2021 and December 31, 2020, respectively, which does not include the impact of any offsetting asset positions. See Note 9 for further information about derivative instruments.

Related-Party Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related-Party Transactions	Note 19. Related-Party Transactions Virginia Power engages in related-party transactions primarily with other Dominion Energy subsidiaries (affiliates). Virginia Power’s 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 is 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. Dominion Energy’s transactions with equity method investments are described in Note 10. 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. At September 30, 2021, Virginia Power’s derivative assets and liabilities with affiliates were $63 million and $2 million, respectively. At December 31, 2020, Virginia Power’s derivative assets and liabilities with affiliates were $3 million and $22 million, respectively. See Note 9 for more information. Virginia Power participates in certain Dominion Energy benefit plans described in Note 22 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. At September 30, 2021 and December 31, 2020, amounts due to Dominion Energy associated with the Dominion Energy Pension Plan and included in other deferred credits and other liabilities in the Consolidated Balance Sheets were $500 million and $436 million, respectively. At September 30, 2021 and December 31, 2020, Virginia Power's amounts due from Dominion Energy associated with the Dominion Energy Retiree Health and Welfare Plan and included in other deferred charges and other assets in the Consolidated Balance Sheets were $412 million and $354 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 Virginia Power’s significant transactions with DES and other affiliates: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Commodity purchases from affiliates $ 219 $ 135 $ 526 $ 450 Services provided by affiliates (1) 116 108 363 343 Services provided to affiliates 6 5 15 14 (1) Includes capitalized expenditures of $39 million for both the three months ended September 30, 2021 and 2020, and $121 million and $107 million for the nine months ended September 30, 2021 and 2020, respectively. Virginia Power has borrowed funds from Dominion Energy under short-term borrowing arrangements. There were $310 million and $380 million in short-term demand note borrowings from Dominion Energy as of September 30, 2021 and December 31, 2020, respectively. Virginia Power had no outstanding borrowings, net of repayments, under the Dominion Energy money pool for its nonregulated subsidiaries as of September 30, 2021 and December 31, 2020. Interest charges related to Virginia Power’s borrowings from Dominion Energy were immaterial for the three and nine months ended September 30, 2021 and 2020. There were no issuances of Virginia Power’s common stock to Dominion Energy for the three and nine months ended September 30, 2021 and 2020.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	Note 20. Employee Benefit Plans Net Periodic Benefit (Credit) Cost The service cost component of net periodic benefit (credit) cost is reflected in other operations and maintenance expense in Dominion Energy’s Consolidated Statements of Income, except for $3 million and $12 million for the three and nine months ended September 30, 2020, respectively, presented in discontinued operations. The non-service cost components of net periodic benefit (credit) cost are reflected in other income in Dominion Energy’s Consolidated Statements of Income. The components of Dominion Energy’s provision for net periodic benefit cost (credit) are as follows: Pension Benefits Other Postretirement Benefits 2021 2020 2021 2020 (millions) Three Months Ended September 30, Service cost $ 43 $ 45 $ 6 $ 8 Interest cost 80 82 11 15 Expected return on plan assets (209 ) (197 ) (43 ) (39 ) Amortization of prior service cost (credit) — (1 ) (11 ) (12 ) Amortization of net actuarial loss 48 58 1 1 Settlements (1) — 3 — — Net periodic benefit credit $ (38 ) $ (10 ) $ (36 ) $ (27 ) Nine Months Ended September 30, Service cost $ 127 $ 131 $ 18 $ 22 Interest cost 238 263 35 45 Expected return on plan assets (625 ) (582 ) (130 ) (117 ) Amortization of prior service cost (credit) — — (32 ) (37 ) Amortization of net actuarial loss 145 155 3 4 Settlements (1) 5 5 — — Net periodic benefit credit $ (110 ) $ (28 ) $ (106 ) $ (83 ) (1) 2021 amounts relate primarily to the Dominion Energy executive nonqualified pension plan. 2020 amounts related primarily to Dominion Energy’s sale of substantially all of its gas transmission and storage operations to BHE. Employer Contributions During the three and nine months ended September 30, 2021, Dominion Energy made no contributions to its qualified defined benefit pension plans or other postretirement benefit plans. Dominion Energy is not required to make any contributions to its qualified defined benefit pension plans or to VEBAs associated with its other postretirement plans in 2021. Dominion Energy considers voluntary contributions from time to time, either in the form of cash or equity securities.

Operating Segments

Operating Segments	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Operating Segments	Note 21. 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 Segment Description of Operations Dominion Energy Virginia Power Dominion Energy Virginia Regulated electric distribution X X Regulated electric transmission X X Regulated electric generation fleet (1) X X Gas Distribution Regulated gas distribution and storage (2) 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 Assets Nonregulated electric generation fleet X Noncontrolling interest in Cove Point X (1) I ncludes Virginia Power’s nonjurisdictional generation operations. (2) Includes renewable natural gas operations as well as Wexpro’s 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 includes its corporate, service company and other functions (including unallocated debt) as well as nonregulated retail energy marketing operations, including Dominion Energy’s noncontrolling interest in Wrangler. 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 as well as the net impact of the gas transmission and storage operations presented in discontinued operations, which are discussed in Note 3. In the nine months ended September 30, 2021, Dominion Energy reported after-tax net expenses of $642 million in the Corporate and Other segment, including $492 million of after-tax net expenses for specific items with $617 million of after-tax net expenses attributable to its operating segments. In the nine months ended September 30, 2020, Dominion Energy reported after-tax net expenses of $3.6 billion in the Corporate and Other segment, including $3.4 billion of after-tax net expenses for specific items with $1.3 billion of after-tax net expenses attributable to its operating segments. The net expenses for specific items attributable to Dominion Energy’s operating segments in 2021 primarily related to the impact of the following items: • A $447 million ($336 million after-tax) loss related to economic hedging activities, attributable to Contracted Assets; • $266 million ($199 million after-tax) of charges associated with the settlement of the South Carolina electric base rate case, attributable to Dominion Energy South Carolina; • A $151 million ($112 million after-tax) loss from an unbilled revenue reduction at Virginia Power, attributable to Dominion Energy Virginia; • A $119 million ($89 million after-tax) net charge associated with the proposed settlement of the 2021 Triennial Review, attributable to Dominion Energy Virginia; • A $77 million ($57 million after-tax) charge for the forgiveness of Virginia retail electric customer accounts in arrears pursuant to Virginia’s 2021 budget process, attributable to Dominion Energy Virginia; • A $70 million ($53 million after-tax) charge associated with litigation acquired in the SCANA Combination, attributable to Dominion Energy South Carolina; • A $68 million ($50 million after-tax) charge associated with storm damage and service restoration in Virginia Power’s service territory, attributable to Dominion Energy Virginia; and • A $44 million ($35 million after-tax) charge related to a revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee, attributable to Contracted Assets; partially offset by • A $309 million ($248 million after-tax) gain related to investments in nuclear decommissioning trust funds, attributable to: • Contracted Assets ($218 million after-tax) and; • Dominion Energy Virginia ($30 million after-tax); and • A $130 million ($97 million after-tax) benefit for a change in the expected CCRO to be provided to Virginia retail electric customers under the GTSA, attributable to Dominion Energy Virginia. The net expense for specific items attributable to Dominion Energy’s operating segments in 2020 primarily related to the impact of the following items: • A $751 million ($564 million after-tax) charge primarily related to the planned early retirement of certain Virginia Power electric generation facilities, attributable to Dominion Energy Virginia; • A $405 million ($298 million after-tax) charge associated with certain nonregulated solar generation facilities, attributable to Contracted Assets; • A $221 million ($171 million after-tax) charge associated with the sale of Fowler Ridge, attributable to Contracted Assets; and • A $200 million ($149 million after-tax) charge for the expected CCRO to be provided to Virginia retail electric utility customers under the GTSA, attributable to Dominion Energy Virginia. The following table presents segment information pertaining to Dominion Energy’s operations: Dominion Energy Virginia Gas Distribution Dominion Energy South Carolina Contracted Assets Corporate and Other Adjustments & Eliminations Consolidated Total (millions) Three Months Ended September 30, 2021 Total revenue from external customers $ 2,333 $ 372 $ 799 $ 265 $ (612 ) $ 18 $ 3,175 Intersegment revenue (3 ) 1 1 17 221 (236 ) 1 Total operating revenue 2,330 373 800 282 (391 ) (218 ) 3,176 Net income from discontinued operations — — — — 65 — 65 Net income (loss) attributable to Dominion Energy 599 69 151 119 (284 ) — 654 Three Months Ended September 30, 2020 Total revenue from external customers $ 2,257 $ 311 $ 758 $ 288 $ (11 ) $ 9 $ 3,612 Intersegment revenue (3 ) 3 1 13 233 (252 ) (5 ) Total operating revenue 2,254 314 759 301 222 (243 ) 3,607 Net income (loss) from discontinued operations — — — 51 (32 ) — 19 Net income (loss) attributable to Dominion Energy 613 64 157 112 (590 ) — 356 Nine Months Ended September 30, 2021 Total revenue from external customers $ 6,072 $ 1,800 $ 2,230 $ 790 $ (857 ) $ 46 $ 10,081 Intersegment revenue (10 ) 4 5 55 686 (737 ) 3 Total operating revenue 6,062 1,804 2,235 845 (171 ) (691 ) 10,084 Net income from discontinued operations — — — — 119 — 119 Net income (loss) attributable to Dominion Energy 1,464 415 337 373 (642 ) — 1,947 Nine Months Ended September 30, 2020 Total revenue from external customers $ 6,013 $ 1,597 $ 2,105 $ 810 $ 112 $ 36 $ 10,673 Intersegment revenue (10 ) 9 3 36 703 (763 ) (22 ) Total operating revenue 6,003 1,606 2,108 846 815 (727 ) 10,651 Net income (loss) from discontinued operations — — — 153 (1,906 ) — (1,753 ) Net income (loss) attributable to Dominion Energy 1,479 375 326 295 (3,558 ) — (1,083 ) 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, including amounts related to entities presented within discontinued operations. Virginia Power The Corporate and Other Segment of Virginia Power 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. In the nine months ended September 30, 2021, Virginia Power reported after-tax net expenses of $118 million in the Corporate and Other segment, including $186 million of after-tax net expenses for specific items all of which was attributable to its operating segment. In the nine months ended September 30, 2020, Virginia Power reported after-tax net expenses of $792 million in the Corporate and Other segment, including $815 million of after-tax net expenses for specific items all of which was attributable to its operating segment. The net expenses for specific items attributable to Virginia Power’s operating segment in 2021 primarily related to the impact of the following items: • A $151 million ($112 million after-tax) loss from an unbilled revenue reduction; • A $119 million ($89 million after-tax) net charge associated with the proposed settlement of the 2021 Triennial Review; • A $77 million ($57 million after-tax) charge for the forgiveness of Virginia retail electric customer accounts in arrears pursuant to Virginia’s 2021 budget process; and • A $68 million ($50 million after-tax) charge associated with storm damage and service restoration in its service territory; partially offset by • A $130 million ($97 million after-tax) benefit for a change in the expected CCRO to be provided to Virginia retail electric customers under the GTSA. The net expense for specific items attributable to Virginia Power’s operating segment in 2020 primarily related to a $751 million ($559 million after-tax) charge related to the planned early retirement of certain Virginia Power electric generation facilities and a $200 million ($149 million after-tax) charge for the expected CCRO to be provided to Virginia retail electric utility customers under the GTSA. The following table presents segment information pertaining to Virginia Power’s operations: Dominion Energy Virginia Corporate and Other Consolidated Total (millions) Three Months Ended September 30, 2021 Operating revenue $ 2,326 $ (350 ) $ 1,976 Net income (loss) 601 (45 ) 556 Three Months Ended September 30, 2020 Operating revenue $ 2,248 $ — $ 2,248 Net income (loss) 615 (140 ) 475 Nine Months Ended September 30, 2021 Operating revenue $ 6,048 $ (501 ) $ 5,547 Net income (loss) 1,462 (118 ) 1,344 Nine Months Ended September 30, 2020 Operating revenue $ 5,983 $ — $ 5,983 Net income (loss) 1,477 (792 ) 685

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Accounting	As permitted by the rules and regulations of the SEC, the Companies’ accompanying unaudited Consolidated Financial Statements contain certain condensed financial information and exclude certain footnote disclosures normally included in annual audited consolidated financial statements prepared in accordance with GAAP. These unaudited Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020. In the Companies’ opinion, the accompanying unaudited Consolidated Financial Statements contain all adjustments necessary to present fairly their financial position at September 30, 2021, their results of operations and changes in equity for the three and nine months ended September 30, 2021 and 2020 and their cash flows for the nine months ended September 30, 2021 and 2020. Such adjustments are normal and recurring in nature unless otherwise noted.
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 and expenses for the periods presented. Actual results may differ from those estimates.
Consolidation	The Companies’ accompanying unaudited Consolidated Financial Statements include, after eliminating intercompany transactions and balances, their accounts, those of their respective majority-owned subsidiaries and non-wholly-owned entities in which they have a controlling financial interest. For certain partnership structures, income is allocated based on the liquidation value of the underlying contractual arrangements. At September 30, 2021, 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. Clearway’s ownership interest in Four Brothers and Three Cedars, Terra Nova Renewable Partners’ 33% interest in certain Dominion Energy nonregulated solar projects and Brookfield’s 25% interest in Cove Point (effective December 2019 until November 2020) are reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements. In August 2021, Dominion Energy entered into an agreement with Terra Nova Renewable Partners to sell its remaining controlling financial interest in certain nonregulated solar projects. Also in August 2021, Dominion Energy entered into an agreement with Clearway to sell its 50% voting interest in Four Brothers and Three Cedars. See Note 11 for more information.
Reclassifications	Certain amounts in the Companies’ 2020 Consolidated Financial Statements and Notes have been reclassified to conform to the 2021 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows. Effective in the second quarter of 2021, the Companies updated their Statements of Cash Flows to present net charges for allowance for credit risk and write-offs of accounts receivables within other adjustments to reconcile net income to net cash provided by operating activities from the previous presentation within changes in accounts receivable. All prior period information has been conformed to this presentation, which does not result in a change to net cash provided by operating activities. Amounts disclosed for Dominion Energy are inclusive of Virginia Power, where applicable. There have been no significant changes from Note 2 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020, with the exception of the items described below.
Cash, Restricted Cash and Equivalents	Cash, Restricted Cash and Equivalents 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 nine months ended September 30, 2021 and 2020: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period September 30, 2021 September 30, 2020 December 31, 2020 December 31, 2019 (millions) Dominion Energy Cash and cash equivalents (1) $ 195 $ 462 $ 179 $ 166 Restricted cash and equivalents (2)(3) 72 96 68 103 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 267 $ 558 $ 247 $ 269 Virginia Power Cash and cash equivalents $ 38 $ 62 $ 35 $ 17 Restricted cash and equivalents (3) 1 1 — 7 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $ 63 $ 35 $ 24 (1) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $15 million, $49 million, $7 million and $31 million of cash and cash equivalents included in current assets held for sale, respectively. (2) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $22 million, $16 million, $3 million and $12 million of restricted cash and equivalents included in current assets held for sale, respectively (3) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. Supplemental Cash Flow Information The following table provides supplemental disclosure of cash flow information related to Dominion Energy: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 374 $ 461 Accrued contributions to equity method affiliates — 15 Leases (2) 75 45 (1) See Notes 16 and 17 for noncash financing activities related to derivative restructuring and the issuance of stock associated with the settlement of litigation and noncash investing activities related to property, plant and equipment conveyed to satisfy litigation, respectively. (2) Includes $34 million and $42 million of financing leases at September 30, 2021 and 2020, respectively, and $41 million and $3 million of operating leases at September 30, 2021 and 2020, respectively. The following table provides supplemental disclosure of cash flow information related to Virginia Power: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 238 $ 234 Leases ( 2 ) 59 26
Property, Plant and Equipment	Property, Plant and Equipment In March 2020, Virginia Power committed to retire certain coal- and oil-fired generating units before the end of their useful lives based on economic and other factors, including but not limited to market power prices and the VCEA. These units will be retired after they meet their capacity obligations to PJM in 2023. In the second quarter of 2020, Virginia Power recorded charges of $30 million ($22 million after-tax) associated with dismantling certain of these electric generation facilities, recorded in impairment of assets and other charges in its Consolidated Statements of Income.
Asset Retirement Obligations	Asset Retirement Obligations In the second quarter of 2021, Dominion Energy revised its estimated cash flow projections associated with the recovery of spent nuclear fuel costs for its AROs associated with the decommissioning of Kewaunee. As a result, Dominion Energy recorded a charge of $44 million ($35 million after-tax) within other operations and maintenance expense in its Consolidated Statements of Income. In the third quarter of 2021, Dominion Energy revised its estimated cash flow projections associated with certain gas distribution pipeline AROs. As a result, Dominion Energy recorded a $252 million decrease to AROs with a corresponding $173 million decrease to property, plant and equipment, net and the remainder primarily recorded as an increase to regulatory liabilities.
Fair Value Measurements	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, futures and swaps contracts. An option model is used to value Level 3 physical options. The discounted cash flow model for forwards, futures and swaps calculates mark-to-market valuations based on forward market prices, original transaction prices, volumes, risk-free rate of return and credit spreads. The option model calculates mark-to-market valuations using variations of the Black-Scholes option model. The inputs into the models are the forward market prices, implied price volatilities, risk-free rate of return, the option expiration dates, the option strike prices, the original sales prices and volumes. For Level 3 fair value measurements, certain forward market prices and implied price volatilities are considered unobservable.
Regulatory Matters Involving Potential Loss Contingencies	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.
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.
Guarantees, Surety Bonds and Letters of Credit	Dominion Energy also enters into guarantee arrangements on behalf of its consolidated subsidiaries, primarily to facilitate their commercial transactions with third parties. If any of these subsidiaries fail to perform or pay under the contracts and the counterparties seek performance or payment, Dominion Energy would be obligated to satisfy such obligation. To the extent that a liability subject to a guarantee has been incurred by one of Dominion Energy’s consolidated subsidiaries, that liability is included in the Consolidated Financial Statements. Dominion Energy is not required to recognize liabilities for guarantees issued on behalf of its subsidiaries unless it becomes probable that it will have to perform under the guarantees. Terms of the guarantees typically end once obligations have been paid. Dominion Energy currently believes it is unlikely that it would be required to perform or otherwise incur any losses associated with guarantees of its subsidiaries’ obligations.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
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 nine months ended September 30, 2021 and 2020: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period September 30, 2021 September 30, 2020 December 31, 2020 December 31, 2019 (millions) Dominion Energy Cash and cash equivalents (1) $ 195 $ 462 $ 179 $ 166 Restricted cash and equivalents (2)(3) 72 96 68 103 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 267 $ 558 $ 247 $ 269 Virginia Power Cash and cash equivalents $ 38 $ 62 $ 35 $ 17 Restricted cash and equivalents (3) 1 1 — 7 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 39 $ 63 $ 35 $ 24 (1) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $15 million, $49 million, $7 million and $31 million of cash and cash equivalents included in current assets held for sale, respectively. (2) At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $22 million, $16 million, $3 million and $12 million of restricted cash and equivalents included in current assets held for sale, respectively (3) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
Schedule of Supplemental Cash Flow Information	The following table provides supplemental disclosure of cash flow information related to Dominion Energy: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 374 $ 461 Accrued contributions to equity method affiliates — 15 Leases (2) 75 45 (1) See Notes 16 and 17 for noncash financing activities related to derivative restructuring and the issuance of stock associated with the settlement of litigation and noncash investing activities related to property, plant and equipment conveyed to satisfy litigation, respectively. (2) Includes $34 million and $42 million of financing leases at September 30, 2021 and 2020, respectively, and $41 million and $3 million of operating leases at September 30, 2021 and 2020, respectively. The following table provides supplemental disclosure of cash flow information related to Virginia Power: Nine Months Ended September 30, 2021 2020 (millions) Significant noncash investing and financing activities: (1) Accrued capital expenditures $ 238 $ 234 Leases ( 2 ) 59 26 (1) See Note 16 for noncash financing activities related to derivative restructuring. (2) Includes $24 million and $26 million of financing leases at September 30, 2021 and 2020, respectively, and $35 million of operating leases at September 30, 2021.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables) - Dominion Energy Gas Holdings, LLC - GT&S Transaction	9 Months Ended
	Sep. 30, 2021
Results of Operations Reported within Discontinued Operations	The following table represents selected information regarding the results of operations, which are reported within discontinued operations in Dominion Energy’s Consolidated Statements of Income: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 Q-Pipe Group GT&S Transaction Q-Pipe Group Q-Pipe Group GT&S Transaction Q-Pipe Group (millions) Operating revenue $ 62 $ 511 $ 59 $ 188 $ 1,554 $ 182 Operating expense (1) 24 208 16 52 1,311 78 Other income (2) 26 (5 ) 1 27 27 3 Interest and related charges (3) 7 267 5 17 366 15 Income (loss) before income taxes 57 31 39 146 (96 ) 92 Income tax expense (benefit) (4) 12 (14 ) 5 29 (65 ) 19 Net income (loss) including noncontrolling interests 45 45 34 117 (31 ) 73 Noncontrolling interests — 32 — — 97 — Net income (loss) attributable to Dominion Energy $ 45 $ 13 $ 34 $ 117 $ (128 ) $ 73 (1) GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in the second quarter of 2020 associated with the probable abandonment of a significant portion of the Supply Header Project, as well as the establishment of a $75 million ARO as a result of the cancellation of the Atlantic Coast Pipeline Project (2) Q-Pipe Group includes a $25 million benefit associated with the termination of the Q-Pipe Transaction in the third quarter of 2021. (3) GT&S Transaction includes a loss of $237 million recorded in the third quarter of 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring (4) Excludes $18 million income tax benefit recorded in the third quarter of 2021 associated with the GT&S Transaction.
Schedule of Major Classes of Assets and Liabilities Reported As Held for Sale in Discontinued Operations	The carrying amounts of major classes of assets and liabilities relating to the disposal groups, which are reported as held for sale in Dominion Energy’s Consolidated Balance Sheets were as follows: At September 30, 2021 At December 31, 2020 Q-Pipe Group Q-Pipe Group (millions) Current assets (1) $ 47 $ 47 Equity method investments (2) 35 35 Property, plant and equipment, net 1,142 1,113 Other deferred charges and other assets, including goodwill and intangible assets (3) 223 224 Current liabilities 35 30 Long-term debt 426 426 Other deferred credits and liabilities 154 154 (1) Includes cash and cash equivalents (2) Comprised of an equity method investment in White River Hub (3) Includes goodwill of $191 million at both September 30, 2021 and December 31, 2020.
Capital Expenditures and Significant Noncash Items Relating to the Disposal Groups	Capital expenditures and significant noncash items relating to the disposal groups included the following: Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 Q-Pipe Group GT&S Transaction Q-Pipe Group (millions) Capital expenditures $ 26 $ 240 $ 27 Significant noncash items: Impairment of assets and other charges — 463 — Depreciation, depletion and amortization — 173 25 Accrued capital expenditures 2 43 2

Operating Revenue (Tables)

Operating Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Regulated And Unregulated Operating Revenue [Abstract]
Schedule of Operating Revenue	The Companies’ operating revenue consists of the following: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Dominion Energy Regulated electric sales: Residential $ 1,281 $ 1,497 $ 3,453 $ 3,746 Commercial 831 865 2,311 2,391 Industrial 194 190 547 548 Government and other retail 258 239 670 651 Wholesale 52 37 131 99 Nonregulated electric sales 253 218 719 627 Regulated gas sales: Residential 132 123 950 853 Commercial 61 50 346 304 Other 31 18 88 61 Nonregulated gas sales 7 12 74 124 Regulated gas transportation and storage 208 165 698 578 Other regulated revenues 47 61 187 236 Other nonregulated revenues (1) 79 61 184 132 Total operating revenue from contracts with customers 3,434 3,536 10,358 10,350 Other revenues (2)(3) (258 ) 71 (274 ) 301 Total operating revenue $ 3,176 $ 3,607 $ 10,084 $ 10,651 Virginia Power Regulated electric sales: Residential $ 935 $ 1,146 $ 2,572 $ 2,860 Commercial 604 645 1,715 1,805 Industrial 94 98 268 284 Government and other retail 241 223 625 603 Wholesale 31 25 79 70 Other regulated revenues 37 61 165 217 Other nonregulated revenues (1)(4) 45 33 93 66 Total operating revenue from contracts with customers 1,987 2,231 5,517 5,905 Other revenues (2)(4) (11 ) 17 30 78 Total operating revenue $ 1,976 $ 2,248 $ 5,547 $ 5,983 (1) Includes sales which are considered to be goods transferred at a point in time of $9 million and $5 million for the three months ended September 30, 2021 and 2020, respectively, and $24 million and $16 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy, primarily consisting of sales of commodities related to nonregulated extraction activities and other miscellaneous products. Additionally, sales of renewable energy credits were $16 million and $21 million for the three months ended September 30, 2021 and 2020, respectively, and $29 million and $32 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy and $13 million and $16 million for the three months ended September 30, 2021 and 2020, respectively, and $22 million and $24 million for the nine months ended September 30, 2021 and 2020, respectively, at Virginia Power. ( 2 ) I ( 3 ) (4) See Note 19 for amounts attributable to affiliates.
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 Dominion Energy expects to recognize this revenue. These revenues relate to contracts containing fixed prices where Dominion Energy will earn the associated revenue over time as it stands 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 Dominion Energy elects to recognize revenue in the amount it has a right to invoice. Revenue expected to be recognized on multi-year contracts in place at September 30, 2021 2021 2022 2023 2024 2025 Thereafter Total (millions) Dominion Energy (1) $ 17 $ 68 $ 66 $ 59 $ 51 $ 493 $ 754 (1) Includes no amounts for Virginia Power.

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
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 Nine Months Ended September 30, 2021 2020 2021 2020 U.S. statutory rate 21.0 % 21.0 % 21.0 % 21.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 2.0 1.5 4.5 4.7 Investment tax credits (5.6 ) (30.5 ) (5.8 ) (5.6 ) Production tax credits (0.5 ) (2.4 ) (0.6 ) (0.9 ) Reversal of excess deferred income taxes (3.8 ) (14.5 ) (2.2 ) (1.9 ) State legislative change (1.0 ) — (1.0 ) — Change in tax status — (6.1 ) — — AFUDC - equity (0.5 ) (1.1 ) (0.5 ) (0.3 ) Changes in state deferred taxes associated with assets held for sale (0.5 ) (11.6 ) — — Absence of tax on noncontrolling interest (0.2 ) 14.1 — — Other, net (1.1 ) (1.8 ) — — Effective tax rate 9.8 % (31.4 )% 15.4 % 17.0 %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share Computation	The following table presents the calculation of Dominion Energy’s basic and diluted EPS: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions, except EPS) Net income attributable to Dominion Energy from continuing operations $ 589 $ 369 $ 1,828 $ 767 Preferred stock dividends (see Note 16) (16 ) (16 ) (48 ) (48 ) Net income attributable to Dominion Energy from continuing operations – Basic 573 353 1,780 719 Dilutive effect of Series A Preferred Stock — — — (28 ) Net income attributable to Dominion Energy from continuing operations - Diluted $ 573 $ 353 $ 1,780 $ 691 Net income (loss) attributable to Dominion Energy from discontinued operations - Basic & Diluted $ 65 $ (13 ) $ 119 $ (1,850 ) Average shares of common stock outstanding – Basic 808.7 833.8 807.1 837.1 Net effect of dilutive securities (1) 1.3 — 0.5 — Average shares of common stock outstanding – Diluted 810.0 833.8 807.6 837.1 EPS from continuing operations – Basic $ 0.71 $ 0.42 $ 2.20 $ 0.86 EPS from discontinued operations – Basic 0.08 (0.01 ) 0.15 (2.21 ) EPS attributable to Dominion Energy – Basic $ 0.79 $ 0.41 $ 2.35 $ (1.35 ) EPS from continuing operations – Diluted $ 0.71 $ 0.42 $ 2.20 $ 0.83 EPS from discontinued operations – Diluted 0.08 (0.01 ) 0.15 (2.21 ) EPS attributable to Dominion Energy – Diluted $ 0.79 $ 0.41 $ 2.35 $ (1.38 ) (1) Primarily related to shares expected to be issued to settle litigation.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents Dominion Energy’s changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrealized gains and losses on investment securities Unrecognized pension and other postretirement benefit costs Other comprehensive loss from equity method investees Total (millions) Three Months Ended September 30, 2021 Beginning balance $ (371 ) $ 41 $ (1,309 ) $ (1 ) $ (1,640 ) Other comprehensive income before reclassifications: gains (losses) (2 ) 4 (1 ) (3 ) (2 ) Amounts reclassified from AOCI: (gains) losses (1) 10 (3 ) 19 — 26 Net current period other comprehensive income (loss) 8 1 18 (3 ) 24 Ending balance $ (363 ) $ 42 $ (1,291 ) $ (4 ) $ (1,616 ) Three Months Ended September 30, 2020 Beginning balance $ (644 ) $ 51 $ (1,385 ) $ (2 ) $ (1,980 ) Other comprehensive income before reclassifications: gains (losses) 10 4 (261 ) 1 (246 ) Amounts reclassified from AOCI: (gains) losses (1) 188 (1 ) 23 — 210 Net current period other comprehensive income (loss) 198 3 (238 ) 1 (36 ) Ending balance $ (446 ) $ 54 $ (1,623 ) $ (1 ) $ (2,016 ) Nine Months Ended September 30, 2021 Beginning balance $ (419 ) $ 62 $ (1,359 ) $ (1 ) $ (1,717 ) Other comprehensive income before reclassifications: gains (losses) 21 (15 ) 5 (3 ) 8 Amounts reclassified from AOCI: (gains) losses (1) 35 (5 ) 63 — 93 Net current period other comprehensive income (loss) 56 (20 ) 68 (3 ) 101 Ending balance $ (363 ) $ 42 $ (1,291 ) $ (4 ) $ (1,616 ) Nine Months Ended September 30, 2020 Beginning balance $ (407 ) $ 37 $ (1,421 ) $ (2 ) $ (1,793 ) Other comprehensive income before reclassifications: gains (losses) (254 ) 32 (262 ) 1 (483 ) Amounts reclassified from AOCI: (gains) losses (1) 215 (15 ) 60 — 260 Net current period other comprehensive income (loss) (39 ) 17 (202 ) 1 (223 ) Ending balance $ (446 ) $ 54 $ (1,623 ) $ (1 ) $ (2,016 ) (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 reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended September 30, 2021 Deferred (gains) and losses on derivatives-hedging activities: Interest rate contracts $ 14 Interest and related charges Total 14 Tax (4 ) Income tax expense (benefit) Total, net of tax $ 10 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (4 ) Other income Total (4 ) Tax 1 Income tax expense (benefit) Total, net of tax $ (3 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (5 ) Other income Amortization of actuarial losses 30 Other income Total 25 Tax (6 ) Income tax expense (benefit) Total, net of tax $ 19 Three Months Ended September 30, 2020 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (8 ) Operating revenue Interest rate contracts 23 Interest and related charges 230 Discontinued operations Foreign currency contracts 6 Discontinued operations Total 251 Tax (63 ) Income tax expense (benefit) Total, net of tax $ 188 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (3 ) Other income Total (3 ) Tax 2 Income tax expense (benefit) Total, net of tax $ (1 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (5 ) Other income Amortization of actuarial losses 36 Other income Total 31 Tax (8 ) Income tax expense (benefit) Total, net of tax $ 23 Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Nine Months Ended September 30, 2021 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 1 Purchased gas Interest rate contracts 46 Interest and related charges Total 47 Tax (12 ) Income tax expense (benefit) Total, net of tax $ 35 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (7 ) Other income Total (7 ) Tax 2 Income tax expense (benefit) Total, net of tax $ (5 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (15 ) Other income Amortization of actuarial losses 100 Other income Total 85 Tax (22 ) Income tax expense (benefit) Total, net of tax $ 63 Nine Months Ended September 30, 2020 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (22 ) Operating revenue 3 Purchased gas (2 ) Discontinued operations Interest rate contracts 66 Interest and related charges 236 Discontinued operations Foreign currency contracts 6 Discontinued operations Total 287 Tax (72 ) Income tax expense (benefit) Total, net of tax $ 215 Unrealized (gains) and losses on investment securities: Realized (gains) losses on sale of securities $ (21 ) Other income Total (21 ) Tax 6 Income tax expense (benefit) Total, net of tax $ (15 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (16 ) Other income Amortization of actuarial losses 97 Other income Total 81 Tax (21 ) Income tax expense (benefit) Total, net of tax $ 60
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents Virginia Power’s changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrealized gains and losses on investment securities Total (millions) Three Months Ended September 30, 2021 Beginning balance $ (39 ) $ 6 $ (33 ) Other comprehensive income before reclassifications: gains (losses) (2 ) — (2 ) Amounts reclassified from AOCI: (gains) losses (1) — (1 ) (1 ) Net current period other comprehensive income (loss) (2 ) (1 ) (3 ) Ending balance $ (41 ) $ 5 $ (36 ) Three Months Ended September 30, 2020 Beginning balance $ (78 ) $ 8 $ (70 ) Other comprehensive income before reclassifications: gains (losses) 5 — 5 Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) 6 (1 ) 5 Ending balance $ (72 ) $ 7 $ (65 ) Nine Months Ended September 30, 2021 Beginning balance $ (60 ) $ 8 $ (52 ) Other comprehensive income before reclassifications: gains (losses) 18 (2 ) 16 Amounts reclassified from AOCI: (gains) losses (1) 1 (1 ) — Net current period other comprehensive income (loss) 19 (3 ) 16 Ending balance $ (41 ) $ 5 $ (36 ) Nine Months Ended September 30, 2020 Beginning balance $ (34 ) $ 5 $ (29 ) Other comprehensive income before reclassifications: gains (losses) (39 ) 4 (35 ) Amounts reclassified from AOCI: (gains) losses (1) 1 (2 ) (1 ) Net current period other comprehensive income (loss) (38 ) 2 (36 ) Ending balance $ (72 ) $ 7 $ (65 ) (1) Amounts are allocated as follows within Virginia Power’s Consolidated Statements of Income; deferred gains and losses on derivatives – hedging activities are recorded to interest and related charges, unrealized gains and losses on investment securities are recorded to other income and associated tax amounts are recorded to income tax expense .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Inputs, Assets, Quantitative Information	The following table presents Dominion Energy’s quantitative information about Level 3 fair value measurements at September 30, 2021. The range and weighted average are presented in dollars for market price inputs and percentages for price volatility. Fair Value (millions) Valuation Techniques Unobservable Input Range Weighted Average (1) Assets Physical and financial forwards: Natural gas (2) $ 52 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 64 Discounted cash flow Market price (per MWh) (3) (1) - 6 2 Electricity 38 Discounted cash flow Market price (per MWh) (3) 24 - 97 37 Physical options: Natural gas 6 Option model Market price (per Dth) (3) 4 - 10 7 Price volatility (4) 19% - 32% 24 % Total assets $ 160 Liabilities Physical and financial forwards: Natural gas (2) $ 1 Discounted cash flow Market price (per Dth) (3) (2) - 5 — FTRs 6 Discounted cash flow Market price (per MWh) (3) (3) - 6 1 Electricity 9 Discounted cash flow Market price (per MWh) (3) 24 - 111 39 Total liabilities $ 16 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4)
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Inputs Position Change to Input Impact on Fair Value Measurement 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) At September 30, 2021 Assets Derivatives: Commodity $ — $ 125 $ 160 $ 285 Interest rate — 371 — 371 Investments (1) Equity securities: U.S. 4,738 — — 4,738 Fixed income: Corporate debt instruments — 879 — 879 Government securities 774 715 — 1,489 Cash equivalents and other 3 — — 3 Total assets $ 5,515 $ 2,090 $ 160 $ 7,765 Liabilities Derivatives: Commodity $ — $ 607 $ 16 $ 623 Interest rate — 327 — 327 Total liabilities $ — $ 934 $ 16 $ 950 At December 31, 2020 Assets Derivatives: Commodity $ — $ 57 $ 110 $ 167 Interest rate — 230 — 230 Investments (1) Equity securities: U.S. 4,648 — — 4,648 Fixed income: Corporate debt instruments — 629 — 629 Government securities 508 730 — 1,238 Cash equivalents and other 32 15 — 47 Total assets $ 5,188 $ 1,661 $ 110 $ 6,959 Liabilities Derivatives: Commodity $ — $ 48 $ 7 $ 55 Interest rate — 431 — 431 Total liabilities $ — $ 479 $ 7 $ 486 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $382 million and $340 million of assets at September 30, 2021 and December 31, 2020, 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: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Beginning balance $ 62 $ 123 $ 103 $ (37 ) Total realized and unrealized gains (losses): Included in earnings: Operating revenue (6 ) — (8 ) — Electric fuel and other energy-related purchases 29 — 12 (26 ) Included in regulatory assets/liabilities 88 4 49 164 Settlements (29 ) — (12 ) 26 Ending balance $ 144 $ 127 $ 144 $ 127
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: September 30, 2021 December 31, 2020 Carrying Amount Estimated Fair Value (1) Carrying Amount Estimated Fair Value (1) (millions) Dominion Energy Long-term debt (2)(3) $ 35,140 $ 40,471 $ 31,996 $ 38,773 Supplemental credit facility borrowings (4) 900 900 225 225 Junior subordinated notes (5) 1,386 1,503 3,411 3,633 Virginia Power Long-term debt (5) $ 13,212 $ 15,570 $ 13,207 $ 16,455 (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 and discount or premium. At September 30, 2021 and December 31, 2020, the carrying amount includes the valuation of certain fair value hedges associated with fixed rate debt of $2 million and $3 million, respectively. (3) Includes amounts classified as held for sale, see Note 3. (4) Also includes Supplemental 364-Day ( 5 ) Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs, discount or premium.
Virginia Electric and Power Company
Fair Value Inputs, Assets, Quantitative Information	The following table presents Virginia Power’s quantitative information about Level 3 fair value measurements at September 30, 2021. The range and weighted average are presented in dollars for market price inputs. Fair Value (millions) Valuation Techniques Unobservable Input Range Weighted Average (1) Assets Physical and financial forwards: Natural gas (2) $ 52 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 64 Discounted cash flow Market price (per MWh) (3) (1) - 6 2 Physical options: Natural gas 6 Option model Market price (per Dth) (3) 4 - 10 7 Price volatility (4) 19% - 32% 24 % Total assets $ 122 Liabilities Physical and financial forwards: Natural gas (2) $ 1 Discounted cash flow Market price (per Dth) (3) (2) - 5 — FTRs 6 Discounted cash flow Market price (per MWh) (3) (3) - 6 1 Total liabilities $ 7 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4)
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable Inputs Position Change to Input Impact on Fair Value Measurement 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) At September 30, 2021 Assets Derivatives: Commodity $ — $ 67 $ 122 $ 189 Interest rate — 170 — 170 Investments (1) Equity securities: U.S. 2,188 — — 2,188 Fixed income: Corporate debt instruments — 516 — 516 Government securities 349 274 — 623 Total assets $ 2,537 $ 1,027 $ 122 $ 3,686 Liabilities Derivatives: Commodity $ — $ 164 $ 7 $ 171 Interest rate — 282 — 282 Total liabilities $ — $ 446 $ 7 $ 453 At December 31, 2020 Assets Derivatives: Commodity $ — $ 5 $ 110 $ 115 Interest rate — 66 — 66 Investments (1) Equity securities: U.S. 2,171 — — 2,171 Fixed income: Corporate debt instruments — 348 — 348 Government securities 201 309 — 510 Cash equivalents and other 13 — — 13 Total assets $ 2,385 $ 728 $ 110 $ 3,223 Liabilities Derivatives: Commodity $ — $ 22 $ 7 $ 29 Interest rate — 376 — 376 Total liabilities $ — $ 398 $ 7 $ 405 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $183 million and $167 million of assets at September 30, 2021 and December 31, 2020, 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: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Beginning balance $ 74 $ 123 $ 103 $ (37 ) Total realized and unrealized gains (losses): Included in earnings: Electric fuel and other energy-related purchases 27 — 10 (26 ) Included in regulatory assets/liabilities 41 4 12 164 Settlements (27 ) — (10 ) 26 Ending balance $ 115 $ 127 $ 115 $ 127

Derivatives and Hedge Account_2

Derivatives and Hedge Accounting Activities (Tables)	9 Months Ended
	Sep. 30, 2021
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: September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 202 $ 10 $ — $ 192 $ 117 $ 9 $ — $ 108 Exchange 45 32 — 13 49 24 — 25 Interest rate contracts: Over-the-counter 371 27 — 344 230 13 — 217 Total derivatives, subject to a master netting or similar arrangement $ 618 $ 69 $ — $ 549 $ 396 $ 46 $ — $ 350 (1) Excludes $38
Offsetting Liabilities	September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 148 $ 10 $ 79 $ 59 $ 30 $ 9 $ — $ 21 Exchange 473 32 441 — 24 24 — — Interest rate contracts: Over-the-counter 327 27 11 289 431 13 17 401 Total derivatives, subject to a master netting or similar arrangement $ 948 $ 69 $ 531 $ 348 $ 485 $ 46 $ 17 $ 422 (1) Excludes $2 million and $1 million of derivative liabilities at September 30, 2021 and December 31, 2020, respectively, which are not subject to master
Schedule of Volume of Derivative Activity	The following table presents the volume of Dominion Energy’s derivative activity at September 30, 2021. 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 its long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 59 9 Basis 202 472 Electricity (MWh): Fixed price 14,286,444 32,508,487 FTRs 71,265,005 — Interest rate (2) $ 1,600 $ 6,715 (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 Dominion Energy’s Consolidated Balance Sheet at September 30, 2021: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (363 ) $ (43 ) 387 months Total $ (363 ) $ (43 )
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, all of which related to discontinued hedging relationships at both September 30, 2021 and December 31, 2020: Carrying Amount of the Hedged Asset (Liability) Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (Liabilities) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 (millions) Long-term debt $ (752 ) $ (1,153 ) $ (2 ) $ (3 )
Fair Value of Derivatives	Fair Value and Gains and Losses on Derivative Instruments The following table presents the fair values of Dominion Energy’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Derivatives under Hedge Accounting Fair Value – Derivatives not under Hedge Accounting Total Fair Value (millions) September 30, 2021 ASSETS Current Assets Commodity $ — $ 190 $ 190 Interest rate — 19 19 Total current derivative assets (1) — 209 209 Noncurrent Assets Commodity — 95 95 Interest rate 170 182 352 Total noncurrent derivative assets (2) 170 277 447 Total derivative assets $ 170 $ 486 $ 656 LIABILITIES Current Liabilities Commodity $ — $ 484 $ 484 Interest rate 253 17 270 Total current derivative liabilities (3) 253 501 754 Noncurrent Liabilities Commodity — 139 139 Interest rate 29 28 57 Total noncurrent derivative liabilities (4) 29 167 196 Total derivative liabilities $ 282 $ 668 $ 950 December 31, 2020 ASSETS Current Assets Commodity $ — $ 58 $ 58 Interest rate — 9 9 Total current derivative assets (1) — 67 67 Noncurrent Assets Commodity — 109 109 Interest rate 66 155 221 Total noncurrent derivative assets (2) 66 264 330 Total derivative assets $ 66 $ 331 $ 397 LIABILITIES Current Liabilities Commodity $ — $ 42 $ 42 Interest rate 363 10 373 Total current derivative liabilities (3) 363 52 415 Noncurrent Liabilities Commodity — 13 13 Interest rate 19 39 58 Total noncurrent derivative liabilities (4) 19 52 71 Total derivative liabilities $ 382 $ 104 $ 486 (1) Current derivative assets include $182 million and $63 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, respectively. The remainder is presented in current assets held for sale 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) I (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) Recognized in AOCI on Derivatives (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ (2 ) $ (14 ) $ 9 Total $ (2 ) $ (14 ) $ 9 Three Months Ended September 30, 2020 Derivative type and location of gains (losses): Commodity: Operating revenue $ 8 Total commodity $ — $ 8 $ — Interest rate: Interest and related charges $ (23 ) Discontinued operations (230 ) Total interest rate $ 8 $ (253 ) $ 62 Foreign currency (4) 6 (6 ) — Total $ 14 $ (251 ) $ 62 Nine Months Ended September 30, 2021 Derivative type and location of gains (losses): Commodity: Purchased gas $ (1 ) Total commodity $ — $ (1 ) $ — Interest rate (3) 29 (46 ) 198 Total $ 29 $ (47 ) $ 198 Nine Months Ended September 30, 2020 Derivative type and location of gains (losses): Commodity: Operating revenue $ 22 Purchased gas (3 ) Discontinued operations 2 Total commodity $ — $ 21 $ — Interest rate: Interest and related charges $ (66 ) Discontinued operations (236 ) Total interest rate $ (328 ) $ (302 ) $ (488 ) Foreign currency (4) (11 ) (6 ) — Total $ (339 ) $ (287 ) $ (488 ) (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 Statement of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statement of Income are classified in discontinued operations.
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 Income on Derivatives (1) Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ (334 ) $ (15 ) $ (521 ) $ 31 Purchased gas 25 4 32 (6 ) Electric fuel and other energy-related purchases 44 (6 ) 7 (79 ) Discontinued operations — (1 ) — 4 Interest rate: Interest and related charges (20 ) 57 142 (21 ) Discontinued operations — 5 — (3 ) Foreign Currency: Discontinued operations — 8 — 8 Total $ (285 ) $ 52 $ (340 ) $ (66 ) (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: September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts Gross Assets Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 122 $ 7 $ — $ 115 $ 111 $ 6 $ — $ 105 Exchange 4 4 — — 1 1 — — Interest rate contracts: Over-the-counter 170 19 — 151 66 7 — 59 Total derivatives, subject to a master netting or similar arrangement $ 296 $ 30 $ — $ 266 $ 178 $ 14 $ — $ 164 (1) Excludes $63
Offsetting Liabilities	September 30, 2021 December 31, 2020 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts Gross Liabilities Presented in the Consolidated Balance Sheet (1) Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 123 $ 7 $ 79 $ 37 $ 6 $ 6 $ — $ — Exchange 46 4 42 — 1 1 — — Interest rate contracts: Over-the-counter 282 19 — 263 376 7 — 369 Total derivatives, subject to a master netting or similar arrangement $ 451 $ 30 $ 121 $ 300 $ 383 $ 14 $ — $ 369 (1) Excludes $2
Schedule of Volume of Derivative Activity	The following table presents the volume of Virginia Power’s derivative activity at September 30, 2021. 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 its long and short positions. Current Noncurrent Natural Gas (bcf): Fixed price (1) 23 9 Basis 143 465 Electricity (MWh): Fixed price 5,953,983 6,092,512 FTRs 71,265,005 — Interest rate (2) $ 850 $ 1,900 (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 September 30, 2021: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (41 ) $ (2 ) 387 months Total $ (41 ) $ (2 )
Fair Value of Derivatives	The following table presents the fair values of Virginia Power’s derivatives and where they are presented in its Consolidated Balance Sheets: Fair Value – Derivatives under Hedge Accounting Fair Value – Derivatives not under Hedge Accounting Total Fair Value (millions) September 30, 2021 ASSETS Current Assets Commodity $ — $ 117 $ 117 Total current derivative assets (1) — 117 117 Noncurrent Assets Commodity — 72 72 Interest rate 170 — 170 Total noncurrent derivative assets (2) 170 72 242 Total derivative assets $ 170 $ 189 $ 359 LIABILITIES Current Liabilities Commodity $ — $ 136 $ 136 Interest rate 253 — 253 Total current derivative liabilities 253 136 389 Noncurrent Liabilities Commodity — 35 35 Interest rate 29 — 29 Total noncurrent derivative liabilities (3) 29 35 64 Total derivative liabilities $ 282 $ 171 $ 453 December 31, 2020 ASSETS Current Assets Commodity $ — $ 22 $ 22 Total current derivative assets (1) — 22 22 Noncurrent Assets Commodity — 93 93 Interest rate 66 — 66 Total noncurrent derivative assets (2) 66 93 159 Total derivative assets $ 66 $ 115 $ 181 LIABILITIES Current Liabilities Commodity $ — $ 28 $ 28 Interest rate 362 — 362 Total current derivative liabilities 362 28 390 Noncurrent Liabilities Commodity — 1 1 Interest rate 14 — 14 Total noncurrent derivative liabilities (3) 14 1 15 Total derivative liabilities $ 376 $ 29 $ 405 (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 relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ (2 ) $ (1 ) $ 8 Total $ (2 ) $ (1 ) $ 8 Three Months Ended September 30, 2020 Derivative type and location of gains (losses): Interest rate (3) $ 6 $ (1 ) $ 60 Total $ 6 $ (1 ) $ 60 Nine Months Ended September 30, 2021 Derivative type and location of gains (losses): Interest rate (3) $ 24 $ (2 ) $ 194 Total $ 24 $ (2 ) $ 194 Nine Months Ended September 30, 2020 Derivative type and location of gains (losses): Interest rate (3) $ (53 ) $ (2 ) $ (492 ) Total $ (53 ) $ (2 ) $ (492 ) (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) Recognized in Income on Derivatives (1) Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (millions) Derivative type and location of gains (losses): Commodity: Operating Revenue $ (19 ) $ — (25 ) $ — Electric fuel and other energy-related purchases 42 (6 ) 5 (79 ) Total $ 23 $ (6 ) $ (20 ) $ (79 ) (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.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
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 Allowance for Credit Losses Fair Value (millions) September 30, 2021 Equity securities: (1) U.S. $ 1,546 $ 3,247 $ (11 ) $ 4,782 Fixed income securities: (2) Corporate debt instruments 842 40 (3 ) $ — 879 Government securities 1,414 44 (6 ) — 1,452 Common/collective trust funds 187 5 — — 192 Insurance contracts 246 — — 246 Cash equivalents and other (3) (28 ) 3 (20 ) — (45 ) Total $ 4,207 $ 3,339 $ (40 ) (4) $ — $ 7,506 December 31, 2020 Equity securities: (1) U.S. $ 1,756 $ 2,948 $ (24 ) $ 4,680 Fixed income securities: (2) Corporate debt instruments 572 58 (1 ) $ — 629 Government securities 1,119 66 (1 ) — 1,184 Common/collective trust funds 170 5 — — 175 Insurance contracts 237 — — 237 Cash equivalents and other (3) (8 ) 4 (1 ) — (5 ) Total $ 3,846 $ 3,081 $ (27 ) (4) $ — $ 6,900 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Changes in allowance for credit losses are included in other income. (3) Includes pending purchases of securities of $48 million and $49 million at September 30, 2021 and December 31, 2020, respectively. (4) The fair value of securities in an unrealized loss position was $846 million and $293 million at September 30, 2021 and December 31, 2020, 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: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Net gains (losses) recognized during the period $ (15 ) $ 308 $ 616 $ 20 Less: Net (gains) losses recognized during the period on securities sold during the period (11 ) (15 ) (323 ) (6 ) Unrealized gains (losses) recognized during the period on securities still held at period end (1) $ (26 ) $ 293 $ 293 $ 14 (1) Included in other income and the nuclear decommissioning trust regulatory liability.
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 September 30, 2021 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 351 Due after one year through five years 667 Due after five years through ten years 654 Due after ten years 851 Total $ 2,523
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. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Proceeds from sales $ 614 $ 1,208 $ 3,324 $ 2,868 Realized gains (1) 25 48 405 188 Realized losses (1) 7 29 81 159 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.
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 Allowance for Credit Losses Fair Value (millions) September 30, 2021 Equity securities: (1) U.S. $ 829 $ 1,497 $ (10 ) $ 2,316 Fixed income securities: (2) Corporate debt instruments 497 21 (1 ) $ — 517 Government securities 608 16 (2 ) — 622 Common/collective trust funds 54 — — — 54 Cash equivalents and other (3) (2 ) — — — (2 ) Total $ 1,986 $ 1,534 $ (13 ) (4) $ — $ 3,507 December 31, 2020 Equity securities: (1) U.S. $ 929 $ 1,371 $ (21 ) $ 2,279 Fixed income securities: (2) Corporate debt instruments 315 33 — $ — 348 Government securities 484 25 — — 509 Common/collective trust funds 58 — — — 58 Cash equivalents and other (3) 3 — — — 3 Total $ 1,789 $ 1,429 $ (21 ) (4) $ — $ 3,197 (1) Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability. (2) Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability . (3) Includes pending purchases of securities o f $ 2 million an d $ 10 million at September 30, 2021 and December 31, 2020, respectively. (4) The fair value of securities in an unrealized loss position was $397 million and $142 million
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: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Net gains (losses) recognized during the period $ 6 $ 138 $ 319 $ (16 ) Less: Net (gains) losses recognized during the period on securities sold during the period (9 ) (6 ) (182 ) (3 ) Unrealized gains (losses) recognized during the period on securities still held at period end (1) $ (3 ) $ 132 $ 137 $ (19 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability.
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 September 30, 2021 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 83 Due after one year through five years 354 Due after five years through ten years 372 Due after ten years 384 Total $ 1,193
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. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Proceeds from sales $ 216 $ 164 $ 1,465 $ 694 Realized gains (1) 17 18 213 73 Realized losses (1) 2 10 28 58 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

Property Plant And Equipment (T

Property Plant And Equipment (Tables)	9 Months Ended
	Sep. 30, 2021
Dominion Energy And Virginia Electric And Power Company
Schedule of Business Acquisitions, by Acquisition	The following table presents acquisitions by Virginia Power of non-jurisdictional solar projects. Virginia Power has claimed or expects to claim federal investment tax credits on the projects. Project Name Date Agreement Entered Date Agreement Closed Project Location Project Cost (millions) (1) Date of Commercial Operations MW Capacity Bookers Mill February 2021 June 2021 Virginia $ 200 Expected 2023 127 Belcher June 2019 August 2019 Virginia 164 June 2021 88 (1) Includes acquisition cost
Dominion Energy
Schedule of Business Acquisitions, by Acquisition	The following table presents acquisitions by Dominion Energy of solar projects. Dominion Energy has claimed or expects to claim federal investment tax credits on the projects. Project Name Date Agreement Entered Date Agreement Closed Project Location Project Cost (millions) (1) Date of Commercial Operations MW Capacity Trask May 2020 October 2020 South Carolina $ 22 March 2021 12 Hardin II August 2020 Expected 2021 Ohio 295 Expected 2022 150 (1) Includes acquisition cost

Regulatory Assets and Liabili_2

Regulatory Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Regulated Operations [Abstract]
Schedule of Regulatory Assets and Liabilities	Regulatory assets and liabilities include the following: September 30, 2021 December 31, 2020 (millions) Dominion Energy Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 147 $ — Deferred project costs and DSM programs for gas utilities (2) 37 35 Unrecovered gas costs (3) 161 78 Deferred rider costs for Virginia electric utility (4) 49 98 Deferred nuclear refueling outage costs (5) 70 53 NND Project costs (6) 138 138 PJM transmission rates (7) 9 71 Deferred early plant retirement charges (8) 226 — Derivatives (9) 161 33 Other 195 193 Regulatory assets-current 1,193 699 Pension and other postretirement benefit costs (10) 1,274 1,363 Deferred rider costs for Virginia electric utility (4) 442 311 Deferred project costs for gas utilities (2) 668 632 Interest rate hedges (11) 838 1,042 AROs and related funding (12) 332 331 Cost of reacquired debt (13) 11 245 NND Project costs (6) 2,261 2,364 Ash pond and landfill closure costs (14) 2,361 2,301 Deferred cost of fuel used in electric generation (1) 139 — Deferred early plant retirement charges (8) 282 — Other 605 544 Regulatory assets-noncurrent 9,213 9,133 Total regulatory assets $ 10,406 $ 9,832 Regulatory liabilities: Deferred cost of fuel used in electric generation (1) $ 1 $ 58 Provision for future cost of removal and AROs (15) 183 183 Reserve for refunds to electric utility customers (16) 422 128 Reserve for future credits to Virginia electric customers (17) — 120 Cost-of-service impact of 2017 Tax Reform Act (18) — 12 Income taxes refundable through future rates (19) 140 124 Monetization of guarantee settlement (20) 67 67 Commodity derivatives (21) 106 9 Other 140 108 Regulatory liabilities-current 1,059 809 Income taxes refundable through future rates (19) 4,274 4,376 Provision for future cost of removal and AROs (15) 2,321 2,150 Nuclear decommissioning trust (22) 1,958 1,719 Monetization of guarantee settlement (20) 848 903 Reserve for refunds to electric utility customers (16) 480 540 Overrecovered other postretirement benefit costs (23) 97 111 Other 368 388 Regulatory liabilities-noncurrent 10,346 10,187 Total regulatory liabilities $ 11,405 $ 10,996 (1) Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations. ( 2 ) Primarily ( 3 ) Reflects unrecovered gas costs at regulated gas operations, which are recovered 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. See Note 13 for more information. ( 5 ) 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. ( 6 ) 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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. ( 7 ) Reflects current portion of amounts to be recovered through retail rates in Virginia for payments Virginia Power expects to make to PJM through 2026 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter. (8) Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 9 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. ( 10 ) 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. ( 1 1 ) 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 September 30, 2021. ( 1 2 ) 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 years . (1 3 ) During the second quarter of 2021, DESC recorded a charge of $237 million ($178 million after-tax) in impairment of assets and other charges to write-off the balance of a regulatory asset that is no longer probable of recovery under the settlement agreement approved in DESC’s retail electric base rate case. See Note 13 for more information. (1 4 ) Primarily reflects legislation enacted in Virginia in 2019, which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 13 for additional information. (1 5 ) 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. Reflects an increase of $66 million associated with the revision of certain gas distribution pipeline AROs in the third quarter of 2021. See Note 2 for more information. (1 6 ) Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period effective February 2019, in connection with the SCANA Merger Approval Order. See Notes 3 and 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. (1 7 ) Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information. (1 8 ) 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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. (1 9 ) Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will primarily 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 period ending in 2039 associated with the monetization of a bankruptcy settlement agreement. See Note 3 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. ( 2 1 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. (2 2 ) 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. (2 3 ) Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred. September 30, 2021 December 31, 2020 (millions) Virginia Power Regulatory assets: Deferred cost of fuel used in electric generation (1) $ 147 $ — Deferred rider costs (2) 49 98 Deferred nuclear refueling outage costs (3) 70 53 PJM transmission rates (4) 9 71 Deferred early plant retirement charges (5) 226 — Derivatives (6) 153 40 Other 36 33 Regulatory assets-current 690 295 Deferred rider costs (2) 442 311 Interest rate hedges (7) 540 733 Ash pond and landfill closure costs (8) 2,361 2,301 Deferred cost of fuel used in electric generation (1) 139 — Deferred early plant retirement charges (5) 282 — Other 177 164 Regulatory assets-noncurrent 3,941 3,509 Total regulatory assets $ 4,631 $ 3,804 Regulatory liabilities: Deferred cost of fuel used in electric generation (1) $ 1 $ 58 Provision for future cost of removal (9) 152 152 Reserve for refunds to Virginia electric customers (10) 299 — Reserve for future credits to Virginia electric customers (11) — 120 Income taxes refundable through future rates (12) 54 54 Derivatives (6) 92 8 Other 87 33 Regulatory liabilities-current 685 425 Income taxes refundable through future rates (12) 2,356 2,404 Nuclear decommissioning trust (13) 1,958 1,719 Provision for future cost of removal (9) 1,042 980 Deferred cost of fuel used in electric generation (1) — 54 Reserve for refunds to Virginia electric customers (10) 31 — Other 173 181 Regulatory liabilities-noncurrent 5,560 5,338 Total regulatory liabilities $ 6,245 $ 5,763 (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. See Note 13 for more information. ( 3 ) 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. ( 4 ) Reflects current portion of amounts to be recovered through retail rates in Virginia for payments Virginia Power expects to make to PJM through 2026 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter. (5) Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 6 ) For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers. ( 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 25 years as of September 30, 2021. ( 8 ) Primarily reflects legislation enacted in Virginia in 2019, which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 13 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 ) Reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information. ( 1 1 ) Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information. ( 1 2 ) 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. (1 3 ) 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.

Regulatory Matters (Tables)

Regulatory Matters (Tables) - Virginia Electric and Power Company	9 Months Ended
	Sep. 30, 2021
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 Date Approval Date Rate Year Beginning Total Revenue Requirement (millions) Increase (Decrease) Over Previous Year (millions) Rider B June 2020 February 2021 April 2021 $ 24 $ (8 ) Rider GV June 2020 February 2021 April 2021 153 21 Rider R June 2020 February 2021 April 2021 58 14 Rider S June 2020 February 2021 April 2021 194 (1 ) Rider W June 2020 February 2021 April 2021 120 14 Rider US-3 July 2020 March 2021 June 2021 38 10 Rider US-4 July 2020 March 2021 June 2021 10 3 Rider BW October 2020 July 2021 September 2021 113 14 Rider US-2 October 2020 July 2021 September 2021 9 — Rider E January 2021 September 2021 November 2021 67 (18 ) Rider B June 2021 Pending April 2022 16 (8 ) Rider W June 2021 Pending April 2022 121 1 Rider US-3 August 2021 Pending June 2022 50 12 Rider US-4 August 2021 Pending June 2022 15 5 Rider US-2 October 2021 Pending September 2022 11 2
Summary of Significant Virginia Power Electric Transmission Projects Applied	Description and Location of Project Application Date Approval Date Type of Line Miles of Lines Cost Estimate (millions) Rebuild Clubhouse-Dry Bread Line and Dry Bread-Lakeview Line in Greensville County, Virginia November 2020 July 2021 230 kV 13 $ 25 Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia April 2021 Pending 500 kV 26 95 Beaumeade-Belmont reconductor and rebuild projects in the County of Loudoun, Virginia May 2021 Pending 230 kV 7 15 Extension to Cloud Switching Station and Easters Switching Station in the County of Mecklenburg, Virginia June 2021 Pending 230 kV 15 105

Significant Financing Transac_2

Significant Financing Transactions (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Instrument [Line Items]
Schedule of Line of Credit Facilities	At September 30, 2021, Dominion Energy’s commercial paper and letters of credit outstanding, as well as its capacity available under the credit facility, were as follows: Facility Limit Outstanding Commercial Paper Outstanding Letters of Credit Facility Capacity Available (millions) Joint revolving credit facility (1) $ 6,000 $ 3,494 $ 99 $ 2,407 (1) This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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
Debt Instrument [Line Items]
Schedule of Line of Credit Facilities	At September 30, 2021, Virginia Power’s share of commercial paper and letters of credit outstanding under the joint revolving credit facility with Dominion Energy, Questar Gas and DESC was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 6,000 $ 896 $ 12 (1) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At September 30, 2021, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Schedule of Subsidiary Guarantees	At September 30, 2021, Dominion Energy had issued the following subsidiary guarantees: Maximum Exposure (millions) Commodity transactions (1) $ 1,892 Nuclear obligations (2) 242 Solar (3) 463 Other (4) 1,254 Total (5) $ 3,851 (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) 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. (4) Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Also includes guarantees entered into by Dominion Energy RNG Holdings II, Inc. on behalf of a subsidiary to facilitate construction of renewable natural gas facilities. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. (5) Excludes Dominion Energy's guarantees for the new corporate office property and an offshore wind installation vessel discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020.

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2021
Virginia Electric and Power Company
Schedule of Related Party Transactions	Presented below are Virginia Power’s significant transactions with DES and other affiliates: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (millions) Commodity purchases from affiliates $ 219 $ 135 $ 526 $ 450 Services provided by affiliates (1) 116 108 363 343 Services provided to affiliates 6 5 15 14 (1) Includes capitalized expenditures of $39 million for both the three months ended September 30, 2021 and 2020, and $121 million and $107 million for the nine months ended September 30, 2021 and 2020, respectively.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Net Periodic Benefit Cost (Credit)	The service cost component of net periodic benefit (credit) cost is reflected in other operations and maintenance expense in Dominion Energy’s Consolidated Statements of Income, except for $3 million and $12 million for the three and nine months ended September 30, 2020, respectively, presented in discontinued operations. The non-service cost components of net periodic benefit (credit) cost are reflected in other income in Dominion Energy’s Consolidated Statements of Income. The components of Dominion Energy’s provision for net periodic benefit cost (credit) are as follows: Pension Benefits Other Postretirement Benefits 2021 2020 2021 2020 (millions) Three Months Ended September 30, Service cost $ 43 $ 45 $ 6 $ 8 Interest cost 80 82 11 15 Expected return on plan assets (209 ) (197 ) (43 ) (39 ) Amortization of prior service cost (credit) — (1 ) (11 ) (12 ) Amortization of net actuarial loss 48 58 1 1 Settlements (1) — 3 — — Net periodic benefit credit $ (38 ) $ (10 ) $ (36 ) $ (27 ) Nine Months Ended September 30, Service cost $ 127 $ 131 $ 18 $ 22 Interest cost 238 263 35 45 Expected return on plan assets (625 ) (582 ) (130 ) (117 ) Amortization of prior service cost (credit) — — (32 ) (37 ) Amortization of net actuarial loss 145 155 3 4 Settlements (1) 5 5 — — Net periodic benefit credit $ (110 ) $ (28 ) $ (106 ) $ (83 )

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Sep. 30, 2021
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 Segment Description of Operations Dominion Energy Virginia Power Dominion Energy Virginia Regulated electric distribution X X Regulated electric transmission X X Regulated electric generation fleet (1) X X Gas Distribution Regulated gas distribution and storage (2) 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 Assets Nonregulated electric generation fleet X Noncontrolling interest in Cove Point X (1) I ncludes Virginia Power’s nonjurisdictional generation operations. (2) Includes renewable natural gas operations as well as Wexpro’s gas development and production operations.
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Dominion Energy’s operations: Dominion Energy Virginia Gas Distribution Dominion Energy South Carolina Contracted Assets Corporate and Other Adjustments & Eliminations Consolidated Total (millions) Three Months Ended September 30, 2021 Total revenue from external customers $ 2,333 $ 372 $ 799 $ 265 $ (612 ) $ 18 $ 3,175 Intersegment revenue (3 ) 1 1 17 221 (236 ) 1 Total operating revenue 2,330 373 800 282 (391 ) (218 ) 3,176 Net income from discontinued operations — — — — 65 — 65 Net income (loss) attributable to Dominion Energy 599 69 151 119 (284 ) — 654 Three Months Ended September 30, 2020 Total revenue from external customers $ 2,257 $ 311 $ 758 $ 288 $ (11 ) $ 9 $ 3,612 Intersegment revenue (3 ) 3 1 13 233 (252 ) (5 ) Total operating revenue 2,254 314 759 301 222 (243 ) 3,607 Net income (loss) from discontinued operations — — — 51 (32 ) — 19 Net income (loss) attributable to Dominion Energy 613 64 157 112 (590 ) — 356 Nine Months Ended September 30, 2021 Total revenue from external customers $ 6,072 $ 1,800 $ 2,230 $ 790 $ (857 ) $ 46 $ 10,081 Intersegment revenue (10 ) 4 5 55 686 (737 ) 3 Total operating revenue 6,062 1,804 2,235 845 (171 ) (691 ) 10,084 Net income from discontinued operations — — — — 119 — 119 Net income (loss) attributable to Dominion Energy 1,464 415 337 373 (642 ) — 1,947 Nine Months Ended September 30, 2020 Total revenue from external customers $ 6,013 $ 1,597 $ 2,105 $ 810 $ 112 $ 36 $ 10,673 Intersegment revenue (10 ) 9 3 36 703 (763 ) (22 ) Total operating revenue 6,003 1,606 2,108 846 815 (727 ) 10,651 Net income (loss) from discontinued operations — — — 153 (1,906 ) — (1,753 ) Net income (loss) attributable to Dominion Energy 1,479 375 326 295 (3,558 ) — (1,083 )
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: Dominion Energy Virginia Corporate and Other Consolidated Total (millions) Three Months Ended September 30, 2021 Operating revenue $ 2,326 $ (350 ) $ 1,976 Net income (loss) 601 (45 ) 556 Three Months Ended September 30, 2020 Operating revenue $ 2,248 $ — $ 2,248 Net income (loss) 615 (140 ) 475 Nine Months Ended September 30, 2021 Operating revenue $ 6,048 $ (501 ) $ 5,547 Net income (loss) 1,462 (118 ) 1,344 Nine Months Ended September 30, 2020 Operating revenue $ 5,983 $ — $ 5,983 Net income (loss) 1,477 (792 ) 685

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended						6 Months Ended	9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Aug. 31, 2021
Significant Accounting Policies [Line Items]
Impairment of assets and other charges (benefits)	$ (222)			$ 1,151				$ 194	$ 1,963
Asset retirement obligations decrease								(252)
Property, plant and equipment, net, decrease								(173)
Other Operations and Maintenance
Significant Accounting Policies [Line Items]
Asset retirement obligation, liabilities incurred							$ 44
Asset retirement obligation, liabilities incurred after tax							$ 35
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Impairment of assets and other charges (benefits)	$ (230)			$ 200				$ (269)	$ 1,008
Virginia Electric and Power Company | Impairment of Assets and Other Charges
Significant Accounting Policies [Line Items]
Impairment of assets and other charges (benefits)		$ 76	$ 127			$ 754
Asset impairment charges after tax		$ 56				$ 561
Virginia Electric and Power Company | Electric Generation Facilities | Impairment of Assets and Other Charges
Significant Accounting Policies [Line Items]
Charges recorded with dismantling					$ 30
Charges recorded with dismantling after tax					$ 22
Cove Point | Brookfield
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	25.00%							25.00%
Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%							50.00%
Four Brothers and Three Cedars | Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Nonregulated Solar Projects
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	33.00%							33.00%
Four Brothers and Three Cedars | Dominion Energy Midstream Partners, LP | Clearway
Significant Accounting Policies [Line Items]
Percentage of equity interests expected to be sold										50.00%

Significant Accounting Polici_5

Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Dec. 31, 2019
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	[1]	$ 195	$ 179		$ 462	$ 166
Restricted cash and equivalents	[2],[3]	72	68		96	103
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		267	247		558	269
Cash and cash equivalents		180	172	[4]
Virginia Electric and Power Company
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		39	35		63	24
Cash and cash equivalents		38	35	[5]	62	17
Restricted cash and equivalents	[3]	$ 1	$ 0		$ 1	$ 7
[1]	At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $15 million, $49 million, $7 million and $31 million of cash and cash equivalents included in current assets held for sale, respectively.
[2]	At September 30, 2021, September 30, 2020, December 31, 2020 and December 31, 2019, Dominion Energy had $22 million, $16 million, $3 million and $12 million of restricted cash and equivalents included in current assets held for sale, respectively
[3]	Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[4]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[5]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Significant Accounting Polici_6

Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Dec. 31, 2019
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	$ 180	$ 172	[1]
Current Assets Held for Sale
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	15	7		$ 49	$ 31
Restricted cash and equivalents	$ 22	$ 3		$ 16	$ 12
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Significant Accounting Polici_7

Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Significant noncash investing and financing activities:
Accrued capital expenditures	[1]	$ 374	$ 461
Accrued contributions to equity method affiliates	[1]	0	15
Leases	[1],[2]	75	45
Virginia Electric and Power Company
Significant noncash investing and financing activities:
Accrued capital expenditures	[3]	238	234
Leases	[3],[4]	$ 59	$ 26
[1]	See Notes 16 and 17 for noncash financing activities related to derivative restructuring and the issuance of stock associated with the settlement of litigation and noncash investing activities related to property, plant and equipment conveyed to satisfy litigation, respectively.
[2]	Includes $34 million and $42 million of financing leases at September 30, 2021 and 2020, respectively, and $41 million and $3 million of operating leases at September 30, 2021 and 2020, respectively.
[3]	See Note 16 for noncash financing activities related to derivative restructuring.
[4]	Includes $24 million and $26 million of financing leases at September 30, 2021 and 2020, respectively, and $35 million of operating leases at September 30, 2021.

Significant Accounting Polici_8

Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Parenthetical) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Supplemental Cash Flow Information [Line Items]
Financing leases	$ 34	$ 42
Operating Leases	41	3
Virginia Electric and Power Company
Schedule Of Supplemental Cash Flow Information [Line Items]
Financing leases	24	$ 26
Operating Leases	$ 35

Acquisitions and Dispositions_2

Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations) (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 31, 2021	Nov. 30, 2020	Oct. 31, 2020	Jul. 31, 2020
Business Acquisition And Dispositions [Line Items]
Credit facility, amount borrowed		$ 900		$ 900
Term Loan Credit Agreement
Business Acquisition And Dispositions [Line Items]
Credit facility, amount borrowed	$ 1,300
Credit facility, description				The agreement matures in December 2021, which can be extended at Dominion Energy’s option to June 2022, and bears interest at a variable rate.
Debt, maturity month and year	2021-12
GT&S Transaction
Business Acquisition And Dispositions [Line Items]
Operating revenue		1	$ 1	$ 3	$ 4
GT&S Transaction | BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, total value of consideration									$ 10,000
Disposal group, cash consideration									$ 4,000
GT&S Transaction | BHE | Transition Service Agreement
Business Acquisition And Dispositions [Line Items]
Operating revenue		$ 5		$ 16
Disposal group, administrative services description				Dominion Energy will continue to provide specified administrative services to support the operations of the disposed business for up to 24 months after closing, subsequently extended through June 2023 for certain services.
GT&S Transaction | BHE | General Partner Interest
Business Acquisition And Dispositions [Line Items]
Noncontrolling partnership interest									100.00%
GT&S Transaction | BHE | Limited Partner Interests
Business Acquisition And Dispositions [Line Items]
Noncontrolling partnership interest									25.00%
Q-Pipe Group | BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, cash consideration								$ 1,300
Q-Pipe Group | Southwest Gas
Business Acquisition And Dispositions [Line Items]
Disposal group, expected to recognized a gain				$ 685
Disposal group, expected to recognized a gain after tax				500
Goodwill write-off				$ 191
Q-Pipe Group | Southwest Gas | Subsequent Event
Business Acquisition And Dispositions [Line Items]
Disposal group, total value of consideration						$ 2,000
Disposal group, cash consideration						$ 1,500
Q-Pipe Transaction | BHE
Business Acquisition And Dispositions [Line Items]
Disposal group, including discontinued operation, deposits							$ 1,300

Acquisitions and Dispositions_3

Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax expense (benefit)		$ (6)	$ (10)	$ 5	$ (572)
Net income (loss) including noncontrolling interests	[1],[2]	65	19	119	(1,753)
Net income (loss) attributable to Dominion Energy		65	(13)	119	(1,850)
GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Operating revenue		1	1	3	4
Income tax expense (benefit)		18
Disposition of GTS Operations | Q-Pipe Group
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Operating revenue		62	59	188	182
Operating expense	[3]	24	16	52	78
Other income	[4]	26	1	27	3
Interest and related charges	[5]	7	5	17	15
Income (loss) before income taxes		57	39	146	92
Income tax expense (benefit)	[6]	12	5	29	19
Net income (loss) including noncontrolling interests		45	34	117	73
Net income (loss) attributable to Dominion Energy		$ 45	34	$ 117	73
Disposition of GTS Operations | GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Operating revenue			511		1,554
Operating expense	[3]		208		1,311
Other income	[4]		(5)		27
Interest and related charges	[5]		267		366
Income (loss) before income taxes			31		(96)
Income tax expense (benefit)	[6]		(14)		(65)
Net income (loss) including noncontrolling interests			45		(31)
Noncontrolling interests			32		97
Net income (loss) attributable to Dominion Energy			$ 13		$ (128)
[1]	Includes income tax expense (benefit) of $(6) million and $(10) million for the three months ended September 30, 2021 and 2020, respectively, and $5 million and $(572) million for the nine months ended September 30, 2021 and 2020, respectively.
[2]	See Note 10 for amounts attributable to related parties.
[3]	GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in the second quarter of 2020 associated with the probable abandonment of a significant portion of the Supply Header Project, as well as the establishment of a $75 million ARO as a result of the cancellation of the Atlantic Coast Pipeline Project
[4]	Q-Pipe Group includes a $25 million benefit associated with the termination of the Q-Pipe Transaction in the third quarter of 2021.
[5]	GT&S Transaction includes a loss of $237 million recorded in the third quarter of 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring
[6]	Excludes $18 million income tax benefit recorded in the third quarter of 2021 associated with the GT&S Transaction.

Acquisitions and Dispositions_4

Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of assets and other charges (benefits)	$ (222)	$ 1,151		$ 194	$ 1,963
Income tax expense (benefit) from discontinued operations	(6)	(10)		$ 5	$ (572)
GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss associated with cash flow hedges of debt-related items		$ 237
Income tax expense (benefit) from discontinued operations	18
Q-Pipe Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Benefit associated with the termination	$ 25
Supply Header Project | GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of assets and other charges (benefits)			$ 482
Asset impairment charges after tax			359
Atlantic Coast Pipeline Project | GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset retirement obligations			$ 75

Acquisitions and Dispositions_5

Acquisitions and Dispositions (Schedule of Major Classes of Assets and Liabilities Reported As Held for Sale in Discontinued Operations) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Current assets		$ 3,039	$ 1,482	[1]
Current liabilities		1,050	625	[1]
Dominion Energy Gas Holdings, LLC | Q-Pipe Group
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Current assets	[2]	47	47
Equity method investments	[3]	35	35
Property, plant and equipment, net		1,142	1,113
Other deferred charges and other assets, including goodwill and intangible assets	[4]	223	224
Current liabilities		35	30
Long-term debt		426	426
Other deferred credits and liabilities		$ 154	$ 154
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Includes cash and cash equivalents
[3]	Comprised of an equity method investment in White River Hub
[4]	Includes goodwill of $191 million at both September 30, 2021 and December 31, 2020.

Acquisitions and Dispositions_6

Acquisitions and Dispositions (Schedule of Major Classes of Assets and Liabilities Reported As Held for Sale in Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Goodwill	$ 7,405	$ 7,381	[1]
Dominion Energy Gas Holdings, LLC | Q-Pipe Group
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash and cash equivalents	1	7
Goodwill	$ 191	$ 191
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Acquisitions and Dispositions_7

Acquisitions and Dispositions (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Significant noncash items:
Impairment of assets and other charges (benefits)		$ (222)	$ 1,151	$ 194	$ 1,963
Depreciation, depletion and amortization		$ 621	$ 595	1,833	1,751
Accrued capital expenditures	[1]			374	461
Dominion Energy Gas Holdings, LLC | GT&S Transaction
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures					240
Significant noncash items:
Impairment of assets and other charges (benefits)					463
Depreciation, depletion and amortization					173
Accrued capital expenditures					43
Dominion Energy Gas Holdings, LLC | Q-Pipe Group
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capital expenditures				26	27
Significant noncash items:
Impairment of assets and other charges (benefits)				0	0
Depreciation, depletion and amortization				0	25
Accrued capital expenditures				$ 2	$ 2
[1]	See Notes 16 and 17 for noncash financing activities related to derivative restructuring and the issuance of stock associated with the settlement of litigation and noncash investing activities related to property, plant and equipment conveyed to satisfy litigation, respectively.

Acquisitions and Dispositions_8

Acquisitions and Dispositions (Sale of Kewaunee) (Narrative) (Detail) - Dominion Energy Kewaunee, Inc - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	May 31, 2021
Business Acquisition And Dispositions [Line Items]
Percentage of equity interests expected to be sold		100.00%
Disposal group, expected to recognized a gain	$ (710)
Disposal group, expected to recognized a gain after tax	$ 565

Acquisitions and Dispositions_9

Acquisitions and Dispositions (Acquisition of Birdseye) (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended
	May 31, 2021	Sep. 30, 2021	Dec. 31, 2020	[1]
Business Acquisition And Dispositions [Line Items]
Goodwill		$ 7,405	$ 7,381
Birdseye
Business Acquisition And Dispositions [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business acquisition, total consideration	$ 46
Business acquisition, cash consideration	28
Business acquisition, fair value of consideration	18
Other deferred charges and other assets	25
Goodwill	$ 24
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Operating Revenue (Schedule of

Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 3,434	$ 3,536	$ 10,358	$ 10,350
Other revenues	[1],[2]	(258)	71	(274)	301
Total operating revenue		3,176	3,607	10,084	10,651
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,281	1,497	3,453	3,746
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		831	865	2,311	2,391
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		194	190	547	548
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		258	239	670	651
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		52	37	131	99
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		253	218	719	627
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		132	123	950	853
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		61	50	346	304
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		31	18	88	61
Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		7	12	74	124
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		208	165	698	578
Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		47	61	187	236
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3]	79	61	184	132
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,987	2,231	5,517	5,905
Other revenues	[1],[4]	(11)	17	30	78
Total operating revenue		1,976	2,248	5,547	5,983
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		935	1,146	2,572	2,860
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		604	645	1,715	1,805
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		94	98	268	284
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		241	223	625	603
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		31	25	79	70
Virginia Electric and Power Company | Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		37	61	165	217
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3],[4]	$ 45	$ 33	$ 93	$ 66
[1]	I
[2]	Includes revenue associated with services provided to discontinued operations of $1 million and $1 million for the three months ended September 30, 2021 and 2020, respectively, and $3 million and $4 million for the nine months ended September 30, 2021 and 2020, respectively.
[3]	Includes sales which are considered to be goods transferred at a point in time of $9 million and $5 million for the three months ended September 30, 2021 and 2020, respectively, and $24 million and $16 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy, primarily consisting of sales of commodities related to nonregulated extraction activities and other miscellaneous products. Additionally, sales of renewable energy credits were $16 million and $21 million for the three months ended September 30, 2021 and 2020, respectively, and $29 million and $32 million for the nine months ended September 30, 2021 and 2020, respectively, at Dominion Energy and $13 million and $16 million for the three months ended September 30, 2021 and 2020, respectively, and $22 million and $24 million for the nine months ended September 30, 2021 and 2020, respectively, at Virginia Power.
[4]	See Note 19 for amounts attributable to affiliates.

Operating Revenue (Schedule o_2

Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 3,434	$ 3,536	$ 10,358	$ 10,350
Other revenues	[1],[2]	(258)	71	(274)	301
GT&S Transaction
Public Utilities General Disclosures [Line Items]
Revenue associated with discontinued operations		1	1	3	4
NGL Midstream | Transferred at a Point in Time
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		9	5	24	16
Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		16	21	29	32
Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues		3	51	50	90
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,987	2,231	5,517	5,905
Other revenues	[1],[3]	(11)	17	30	78
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		13	16	22	24
Virginia Electric and Power Company | Alternative Revenue Programs
Public Utilities General Disclosures [Line Items]
Other revenues		$ 3	$ 12	$ 41	$ 63
[1]	I
[2]	Includes revenue associated with services provided to discontinued operations of $1 million and $1 million for the three months ended September 30, 2021 and 2020, respectively, and $3 million and $4 million for the nine months ended September 30, 2021 and 2020, respectively.
[3]	See Note 19 for amounts attributable to affiliates.

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	Sep. 30, 2021USD ($)
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 754
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	$ 17
Revenue, expected to be recognized on multi-year contracts, period	3 months
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	$ 68
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	$ 66
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	$ 59
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	$ 51
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 493
Revenue, expected to be recognized on multi-year contracts, period

Operating Revenue (Schedule o_4

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) (Detail1) $ in Millions	Sep. 30, 2021USD ($)
Revenue From Contract With Customer [Abstract]
Revenue, expected to be recognized on multi-year contracts	$ 754

Operating Revenue (Narrative) (

Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues From Contract With Customer [Line Items]
Revenue recognized from contract liability balances	$ 124	$ 95
Other Current Liabilities and Other Deferred Credits and Other Liabilities
Revenues From Contract With Customer [Line Items]
Contract liability balances	124		$ 130
Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Revenue recognized from contract liability balances	36	$ 24
Virginia Electric and Power Company | Other Current Liabilities and Other Deferred Credits and Other Liabilities
Revenues From Contract With Customer [Line Items]
Contract liability balances	$ 29		$ 36

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Effective Income Tax Computation [Line Items]
U.S. statutory rate	21.00%	21.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	2.00%	1.50%
Investment tax credits	(5.60%)	(30.50%)
Production tax credits	(0.50%)	(2.40%)
Reversal of excess deferred income taxes	(3.80%)	(14.50%)
State legislative change	(1.00%)
Change in tax status		(6.10%)
AFUDC - equity	(0.50%)	(1.10%)
Changes in state deferred taxes associated with assets held for sale	(0.50%)	(11.60%)
Absence of tax on noncontrolling interest	(0.20%)	14.10%
Other, net	(1.10%)	(1.80%)
Effective tax rate	9.80%	(31.40%)
Virginia Electric and Power Company
Effective Income Tax Computation [Line Items]
U.S. statutory rate	21.00%	21.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	4.50%	4.70%
Investment tax credits	(5.80%)	(5.60%)
Production tax credits	(0.60%)	(0.90%)
Reversal of excess deferred income taxes	(2.20%)	(1.90%)
State legislative change	(1.00%)
AFUDC - equity	(0.50%)	(0.30%)
Effective tax rate	15.40%	17.00%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Weighted average rate reversal of deferred taxes to originate the deferred tax liability			35.00%
Deferred tax benefit			$ 21
Income tax expense attributable to noncontrolling interest				$ 55
Income tax expense (benefit) from discontinued operations	$ (6)	$ (10)	5	(572)
GT&S Transaction
Income Taxes [Line Items]
Income tax expense (benefit) from discontinued operations	$ 18
Discontinued Operations | GT&S Transaction
Income Taxes [Line Items]
Income tax benefit related to finalizing income tax returns			15
Atlantic Coast Pipeline | Supply Header Project | Discontinued Operations
Income Taxes [Line Items]
Income taxes charge				81
State
Income Taxes [Line Items]
Income tax benefit associated with remeasurement of state deferred taxes				$ 45
Virginia Electric and Power Company
Income Taxes [Line Items]
Deferred tax benefit			$ 16

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		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income from continuing operations		$ 589	$ 369	$ 1,828	$ 767
Preferred stock dividends (see Note 16)		(16)	(16)	(48)	(48)
Net income attributable to Dominion Energy from continuing operations – Basic		573	353	1,780	719
Dilutive effect of Series A Preferred Stock					(28)
Net income attributable to Dominion Energy from continuing operations - Diluted		573	353	1,780	691
Net income (loss) from discontinued operations		$ 65	$ (13)	$ 119	$ (1,850)
Average shares of common stock outstanding – Basic		808.7	833.8	807.1	837.1
Net effect of dilutive securities	[1]	1.3		0.5
Average shares of common stock outstanding – Diluted		810	833.8	807.6	837.1
EPS from continuing operations – Basic		$ 0.71	$ 0.42	$ 2.20	$ 0.86
EPS from discontinued operations – Basic		0.08	(0.01)	0.15	(2.21)
EPS attributable to Dominion Energy – Basic		0.79	0.41	2.35	(1.35)
EPS from continuing operations – Diluted		0.71	0.42	2.20	0.83
EPS from discontinued operations – Diluted		0.08	(0.01)	0.15	(2.21)
EPS attributable to Dominion Energy – Diluted		$ 0.79	$ 0.41	$ 2.35	$ (1.38)
[1]	Primarily related to shares expected to be issued to settle litigation.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[1]			$ 26,117
Total other comprehensive income (loss)		$ 24	$ (36)	101		$ (223)
Ending balance		26,906		26,906
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		15,064	13,944	14,557	[2]	13,989
Total other comprehensive income (loss)		(3)	5	16		(36)
Ending balance		15,617	14,315	15,617		14,315
Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(371)	(644)	(419)		(407)
Other comprehensive income before reclassifications: gains (losses)		(2)	10	21		(254)
Amounts reclassified from AOCI: (gains) losses	[3]	10	188	35		215
Total other comprehensive income (loss)		8	198	56		(39)
Ending balance		(363)	(446)	(363)		(446)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(39)	(78)	(60)		(34)
Other comprehensive income before reclassifications: gains (losses)		(2)	5	18		(39)
Amounts reclassified from AOCI: (gains) losses	[4]	0	1	1		1
Total other comprehensive income (loss)		(2)	6	19		(38)
Ending balance		(41)	(72)	(41)		(72)
Unrealized Gains and Losses on Investment Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		41	51	62		37
Other comprehensive income before reclassifications: gains (losses)		4	4	(15)		32
Amounts reclassified from AOCI: (gains) losses	[3]	(3)	(1)	(5)		(15)
Total other comprehensive income (loss)		1	3	(20)		17
Ending balance		42	54	42		54
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		6	8	8		5
Other comprehensive income before reclassifications: gains (losses)		0	0	(2)		4
Amounts reclassified from AOCI: (gains) losses	[4]	(1)	(1)	(1)		(2)
Total other comprehensive income (loss)		(1)	(1)	(3)		2
Ending balance		5	7	5		7
Unrecognized Pension and Other Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,309)	(1,385)	(1,359)		(1,421)
Other comprehensive income before reclassifications: gains (losses)		(1)	(261)	5		(262)
Amounts reclassified from AOCI: (gains) losses	[3]	19	23	63		60
Total other comprehensive income (loss)		18	(238)	68		(202)
Ending balance		(1,291)	(1,623)	(1,291)		(1,623)
Other Comprehensive Loss From Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1)	(2)	(1)		(2)
Other comprehensive income before reclassifications: gains (losses)		(3)	1	(3)		1
Amounts reclassified from AOCI: (gains) losses	[3]	0	0	0		0
Total other comprehensive income (loss)		(3)	1	(3)		1
Ending balance		(4)	(1)	(4)		(1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,640)	(1,980)	(1,717)		(1,793)
Other comprehensive income before reclassifications: gains (losses)		(2)	(246)	8		(483)
Amounts reclassified from AOCI: (gains) losses	[3]	26	210	93		260
Total other comprehensive income (loss)		24	(36)	101		(223)
Ending balance		(1,616)	(2,016)	(1,616)		(2,016)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(33)	(70)	(52)		(29)
Other comprehensive income before reclassifications: gains (losses)		(2)	5	16		(35)
Amounts reclassified from AOCI: (gains) losses	[4]	(1)	0	0		(1)
Total other comprehensive income (loss)		(3)	5	16		(36)
Ending balance		$ (36)	$ (65)	$ (36)		$ (65)
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	See table below for details about these reclassifications.
[4]	Amounts are allocated as follows within Virginia Power’s Consolidated Statements of Income; deferred gains and losses on derivatives – hedging activities are recorded to interest and related charges, unrealized gains and losses on investment securities are recorded to other income and associated tax amounts are recorded to income tax expense .

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue	$ (3,176)	$ (3,607)	$ (10,084)	$ (10,651)
Interest and related charges	407	306	978	1,136
Income tax expense (benefit)	35	(110)	200	(123)
Income (loss) including noncontrolling interests, net of tax	(601)	(112)	(1,850)	(513)
Other income	(133)	(286)	(732)	(327)
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	14	251	47	287
Income tax expense (benefit)	(4)	(63)	(12)	(72)
Income (loss) including noncontrolling interests, net of tax	10	188	35	215
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue		(8)		(22)
Purchased gas			1	3
Discontinued operations				(2)
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Discontinued operations		230		236
Interest and related charges	14	23	46	66
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign Currency Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Discontinued operations		6		6
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gains) losses on sale of securities	(4)	(3)	(7)	(21)
Income from operations before income tax expense	(4)	(3)	(7)	(21)
Income tax expense (benefit)	1	2	2	6
Income (loss) including noncontrolling interests, net of tax	(3)	(1)	(5)	(15)
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income	(5)	(5)	(15)	(16)
Amortization of actuarial losses | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income	30	36	100	97
Unrecognized pension and other postretirement benefit costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrecognized pension and other postretirement benefit costs, before tax	25	31	85	81
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit)	(6)	(8)	(22)	(21)
Unrecognized pension and other postretirement benefit costs, net of tax	$ 19	$ 23	$ 63	$ 60

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions		9 Months Ended
		Sep. 30, 2021USD ($)$ / MMBTU$ / MWh	Dec. 31, 2020USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 656	$ 397
Fair Value of Derivative Liabilities		950	486
Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		359	181
Fair Value of Derivative Liabilities		453	405
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Total assets		7,765	6,959
Total liabilities		950	486
Fair Value, Measurements, Recurring | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Total assets		3,686	3,223
Total liabilities		453	405
Fair Value, Measurements, Recurring | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		285	167
Fair Value of Derivative Liabilities		623	55
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		189	115
Fair Value of Derivative Liabilities		171	29
Fair Value, Measurements, Recurring | Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Total assets		160	110
Total liabilities		16	7
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Total assets		122	110
Total liabilities		7	7
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		160	110
Fair Value of Derivative Liabilities		16	7
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		122	110
Fair Value of Derivative Liabilities		7	$ 7
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[1]	52
Fair Value of Derivative Liabilities	[1]	1
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[1]	52
Fair Value of Derivative Liabilities	[1]	$ 1
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Minimum | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	5
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Maximum | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2]	5
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2],[3]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2],[3]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2],[3]	0
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Natural Gas | Weighted Average | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[1],[2],[3]	0
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 64
Fair Value of Derivative Liabilities		6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		64
Fair Value of Derivative Liabilities		$ 6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	(3)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Minimum | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	(3)
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Maximum | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	2
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	2
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | FTRs | Weighted Average | Liabilities | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 38
Fair Value of Derivative Liabilities		$ 9
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Minimum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	24
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Minimum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	24
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Maximum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	97
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Maximum | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2]	111
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Weighted Average | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	37
Fair Value, Measurements, Recurring | Level 3 | Discounted Cash Flow | Commodity | Electricity | Weighted Average | Liabilities | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MWh	[2],[3]	39
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 6
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 6
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2]	4
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2]	4
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Price Volatility
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	19.00%
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Minimum | Assets | Price Volatility | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	19.00%
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2]	10
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2]	10
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Price Volatility
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	32.00%
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Maximum | Assets | Price Volatility | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[4]	32.00%
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Market Price
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2],[3]	7
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Market Price | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market Price | $ / MMBTU	[2],[3]	7
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Price Volatility
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[3],[4]	24.00%
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity | Natural Gas | Weighted Average | Assets | Price Volatility | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Price volatility (percentage)	[3],[4]	24.00%
[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						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	$ (222,000,000)				$ 1,151,000,000		$ 194,000,000	$ 1,963,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category	(6,000,000)				0		(8,000,000)	0
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	(230,000,000)				200,000,000		(269,000,000)	1,008,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category	0				$ 0		0	$ 0
Corporate Office Building | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, estimated fair value	26,000,000						$ 26,000,000
Nonregulated Retail Software Development | Level 2 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, estimated fair value		$ 1,000,000
Impairment of Assets and Other Charges | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)			$ 76,000,000	$ 127,000,000		$ 754,000,000
Asset impairment charges after tax			$ 56,000,000			$ 561,000,000
Impairment of Assets and Other Charges | Corporate Office Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	16,000,000
Asset impairment charges after tax	$ 12,000,000
Impairment of Assets and Other Charges | Nonregulated Retail Software Development
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)		20,000,000
Asset impairment charges after tax		$ 15,000,000

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		$ 656	$ 397
Derivative Liabilities		950	486
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		359	181
Derivative Liabilities		453	405
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		7,765	6,959
Total Liabilities		950	486
Fair Value, Measurements, Recurring | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		3,686	3,223
Total Liabilities		453	405
Fair Value, Measurements, Recurring | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	4,738	4,648
Fair Value, Measurements, Recurring | Equity securities: | U.S. | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	2,188	2,171
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	879	629
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	516	348
Fair Value, Measurements, Recurring | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	1,489	1,238
Fair Value, Measurements, Recurring | Fixed Income | Government Securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	623	510
Fair Value, Measurements, Recurring | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	3	47
Fair Value, Measurements, Recurring | Cash equivalents and other | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]		13
Fair Value, Measurements, Recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		285	167
Derivative Liabilities		623	55
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		189	115
Derivative Liabilities		171	29
Fair Value, Measurements, Recurring | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		371	230
Derivative Liabilities		327	431
Fair Value, Measurements, Recurring | Interest rate | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		170	66
Derivative Liabilities		282	376
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		5,515	5,188
Total Liabilities		0	0
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		2,537	2,385
Total Liabilities		0	0
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	4,738	4,648
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	2,188	2,171
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	0	0
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	774	508
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	349	201
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	3	32
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]		13
Fair Value, Measurements, Recurring | Level 1 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Fair Value, Measurements, Recurring | Level 1 | Commodity | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		2,090	1,661
Total Liabilities		934	479
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		1,027	728
Total Liabilities		446	398
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S. | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	0	0
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	[1]	879	629
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	516	348
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	715	730
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	274	309
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]	0	15
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents and other | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]		0
Fair Value, Measurements, Recurring | Level 2 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		125	57
Derivative Liabilities		607	48
Fair Value, Measurements, Recurring | Level 2 | Commodity | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		67	5
Derivative Liabilities		164	22
Fair Value, Measurements, Recurring | Level 2 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		371	230
Derivative Liabilities		327	431
Fair Value, Measurements, Recurring | Level 2 | Interest rate | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		170	66
Derivative Liabilities		282	376
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		160	110
Total Liabilities		16	7
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		122	110
Total Liabilities		7	7
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S. | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	0	0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	0	0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	0	0
Fair Value, Measurements, Recurring | Level 3 | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[1]	0	0
Fair Value, Measurements, Recurring | Level 3 | Cash equivalents and other | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]		0
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		160	110
Derivative Liabilities		16	7
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		122	110
Derivative Liabilities		7	7
Fair Value, Measurements, Recurring | Level 3 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Fair Value, Measurements, Recurring | Level 3 | Interest rate | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		$ 0	$ 0
[1]	Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $382 million and $340 million of assets at September 30, 2021 and December 31, 2020, 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.
[2]	Includes investments held in the nuclear decommissioning trusts. Excludes $183 million and $167 million of assets at September 30, 2021 and December 31, 2020, 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 Measurements (Asse_2

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value using NAV	$ 382	$ 340
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	$ 183	$ 167

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) - Commodity - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 62	$ 123	$ 103	$ (37)
Total realized and unrealized gains (losses):
Included in regulatory assets/liabilities	88	4	49	164
Settlements	(29)	0	(12)	26
Ending balance	144	127	144	127
Virginia Electric and Power Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	74	123	103	(37)
Total realized and unrealized gains (losses):
Included in regulatory assets/liabilities	41	4	12	164
Settlements	(27)	0	(10)	26
Ending balance	115	127	115	127
Operating Revenue
Total realized and unrealized gains (losses):
Included in earnings	(6)	0	(8)	0
Electric Fuel and Other Energy-Related Purchases
Total realized and unrealized gains (losses):
Included in earnings	29	0	12	(26)
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company
Total realized and unrealized gains (losses):
Included in earnings	$ 27	$ 0	$ 10	$ (26)

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[1],[2]	$ 35,140	$ 31,996
Supplemental credit facility borrowings	[3]	900	225
Junior subordinated notes	[4]	1,386	3,411
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[1],[2],[5]	40,471	38,773
Supplemental credit facility borrowings	[3],[5]	900	225
Junior subordinated notes	[4],[5]	1,503	3,633
Virginia Electric and Power Company | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[4]	13,212	13,207
Virginia Electric and Power Company | Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	[4],[5]	$ 15,570	$ 16,455
[1]	Carrying amount includes current portions included in securities due within one year and amounts which represent the unamortized debt issuance costs and discount or premium. At September 30, 2021 and December 31, 2020, the carrying amount includes the valuation of certain fair value hedges associated with fixed rate debt of $2 million and $3 million, respectively.
[2]	Includes amounts classified as held for sale, see Note 3.
[3]	Also includes Supplemental 364-Day
[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.
[5]	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	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation of certain fair value hedges associated with fixed rate debt		$ 2	$ 3
Supplemental line of credit facility borrowings expiration period		1 year
364-Day Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument Term	364 days	364 days	364 days

Derivatives and Hedge Account_3

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	$ 618	$ 396
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		69	46
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		549	350
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[2]	296	178
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		30	14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		266	164
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	202	117
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		10	9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		192	108
Commodity | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[2]	122	111
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		7	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		115	105
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	45	49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		32	24
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		13	25
Commodity | Exchange | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[2]	4	1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		4	1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		0	0
Interest rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[1]	371	230
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		27	13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		344	217
Interest rate | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Assets Presented in the Consolidated Balance Sheet	[2]	170	66
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		19	7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amounts		$ 151	$ 59
[1]	Excludes $38
[2]	Excludes $63

Derivatives and Hedge Account_4

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Derivative assets, not subject to a master netting or similar arrangement	$ 38	$ 1
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Derivative assets, not subject to a master netting or similar arrangement	$ 63	$ 3

Derivatives and Hedge Account_5

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[1]	$ 948	$ 485
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		69	46
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		531	17
Net Amounts		348	422
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[2]	451	383
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		30	14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		121	0
Net Amounts		300	369
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[1]	148	30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		10	9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		79	0
Net Amounts		59	21
Commodity | Over-the-counter | Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[2]	123	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		7	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		79	0
Net Amounts		37	0
Commodity | Exchange
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[1]	473	24
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		32	24
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		441	0
Net Amounts		0	0
Commodity | Exchange | Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[2]	46	1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		4	1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		42	0
Net Amounts		0	0
Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[1]	327	431
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		27	13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		11	17
Net Amounts		289	401
Interest rate | Over-the-counter | Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Liabilities Presented in the Consolidated Balance Sheet	[2]	282	376
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments		19	7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral		0	0
Net Amounts		$ 263	$ 369
[1]	Excludes $2 million and $1 million of derivative liabilities at September 30, 2021 and December 31, 2020, respectively, which are not subject to master
[2]	Excludes $2

Derivatives and Hedge Account_6

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Derivative liabilities, not subject to a master netting or similar arrangement	$ 2	$ 1
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Derivative liabilities, not subject to a master netting or similar arrangement	$ 2	$ 22

Derivatives and Hedge Account_7

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)MWhBcf
Fixed Price - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	59	[1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	23	[1]
Basis - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	202
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	143
Fixed Price - Electricity - Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	14,286,444
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	5,953,983
Financial Transmission Rights - Electricity- Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	71,265,005
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	71,265,005
Interest Rate - Current Derivative Contract
Derivative [Line Items]
Derivative payment | $	$ 1,600,000,000	[2]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Derivative payment | $	$ 850,000,000	[2]
Fixed Price - Natural Gas - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	9	[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	472
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	465
Fixed Price - Electricity - Non-current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	32,508,487
Fixed Price - Electricity - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	6,092,512
Financial Transmission Rights - Electricity- Non-current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	0
Financial Transmission Rights - Electricity- Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	0
Interest Rate - Non-current Derivative Contract
Derivative [Line Items]
Derivative payment | $	$ 6,715,000,000	[2]
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Derivative payment | $	$ 1,900,000,000	[2]
[1]	Includes options.
[2]	Maturity is determined based on final settlement period.

Derivatives and Hedge Account_8

Derivatives and Hedge Accounting Activities (Selected Information Related to Losses on Cash Flow Hedges Included in AOCI) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (363)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(43)
Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	(41)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(2)
Interest rate contracts
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	(363)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (43)
Maximum Term	387 months
Interest rate contracts | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
AOCI After-Tax	$ (41)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (2)
Maximum Term	387 months

Derivatives and Hedge Account_9

Derivatives and Hedge Accounting Activities (Narrative) (Detail) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Derivative Instrument Detail [Abstract]
Derivative instruments designated in fair value hedges	$ 0	$ 0

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) (Detail) - Designated as Hedging Instrument - Fair Value Hedging - Long-term Debt - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Carrying Amount of the Hedged Asset (Liability)	$ (752)	$ (1,153)
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (Liabilities)	$ (2)	$ (3)

Derivatives and Hedge Accoun_11

Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[1]	$ 209	$ 67
Derivative Asset, Noncurrent	[2]	447	330
Derivative Asset		656	397
Derivative Liabilities, Current	[3]	754	415
Derivative Liabilities, Current		729	412	[4]
Derivative Liabilities, Noncurrent	[5]	196	71
Derivative Liabilities		950	486
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[6]	117	22
Derivative Asset, Noncurrent	[7]	242	159
Derivative Asset		359	181
Derivative Liabilities, Current	[8]	389	390	[9]
Derivative Liabilities, Noncurrent	[10]	64	15
Derivative Liabilities		453	405
Commodity contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		190	58
Derivative Asset, Noncurrent		95	109
Derivative Liabilities, Current		484	42
Derivative Liabilities, Noncurrent		139	13
Commodity contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current		117	22
Derivative Asset, Noncurrent		72	93
Derivative Liabilities, Current		136	28
Derivative Liabilities, Noncurrent		35	1
Interest rate contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		19	9
Derivative Asset, Noncurrent		352	221
Derivative Liabilities, Current		270	373
Derivative Liabilities, Noncurrent		57	58
Interest rate contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Noncurrent		170	66
Derivative Liabilities, Current		253	362
Derivative Liabilities, Noncurrent		29	14
Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[1]	0	0
Derivative Asset, Noncurrent	[2]	170	66
Derivative Asset		170	66
Derivative Liabilities, Current	[3]	253	363
Derivative Liabilities, Noncurrent	[5]	29	19
Derivative Liabilities		282	382
Designated as Hedging Instrument | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[6]	0	0
Derivative Asset, Noncurrent	[7]	170	66
Derivative Asset		170	66
Derivative Liabilities, Current		253	362
Derivative Liabilities, Noncurrent	[10]	29	14
Derivative Liabilities		282	376
Designated as Hedging Instrument | Commodity contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		0	0
Derivative Asset, Noncurrent		0	0
Derivative Liabilities, Current		0	0
Derivative Liabilities, Noncurrent		0	0
Designated as Hedging Instrument | Commodity contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current		0	0
Derivative Asset, Noncurrent		0	0
Derivative Liabilities, Current		0	0
Derivative Liabilities, Noncurrent		0	0
Designated as Hedging Instrument | Interest rate contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		0	0
Derivative Asset, Noncurrent		170	66
Derivative Liabilities, Current		253	363
Derivative Liabilities, Noncurrent		29	19
Designated as Hedging Instrument | Interest rate contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Noncurrent		170	66
Derivative Liabilities, Current		253	362
Derivative Liabilities, Noncurrent		29	14
Fair Value - Derivatives not under Hedge Accounting
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[1]	209	67
Derivative Asset, Noncurrent	[2]	277	264
Derivative Asset		486	331
Derivative Liabilities, Current	[3]	501	52
Derivative Liabilities, Noncurrent	[5]	167	52
Derivative Liabilities		668	104
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current	[6]	117	22
Derivative Asset, Noncurrent	[7]	72	93
Derivative Asset		189	115
Derivative Liabilities, Current		136	28
Derivative Liabilities, Noncurrent	[10]	35	1
Derivative Liabilities		171	29
Fair Value - Derivatives not under Hedge Accounting | Commodity contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		190	58
Derivative Asset, Noncurrent		95	109
Derivative Liabilities, Current		484	42
Derivative Liabilities, Noncurrent		139	13
Fair Value - Derivatives not under Hedge Accounting | Commodity contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Current		117	22
Derivative Asset, Noncurrent		72	93
Derivative Liabilities, Current		136	28
Derivative Liabilities, Noncurrent		35	1
Fair Value - Derivatives not under Hedge Accounting | Interest rate contracts
Derivatives Fair Value [Line Items]
Derivative Asset, Current		19	9
Derivative Asset, Noncurrent		182	155
Derivative Liabilities, Current		17	10
Derivative Liabilities, Noncurrent		28	39
Fair Value - Derivatives not under Hedge Accounting | Interest rate contracts | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset, Noncurrent		0	0
Derivative Liabilities, Current		0	0
Derivative Liabilities, Noncurrent		$ 0	$ 0
[1]	Current derivative assets include $182 million and $63 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, respectively.  The remainder is presented in current assets held for sale 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]	I
[4]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[5]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets
[6]	Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[7]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[8]	See Note 19 for amounts attributable to affiliates.
[9]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[10]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

Derivatives and Hedge Accoun_12

Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Parenthetical) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Current derivative assets	[1]	$ 209	$ 67
Current derivative liabilities		729	412	[2]
Other Current Assets
Derivatives Fair Value [Line Items]
Current derivative assets		182	63
Current Liabilities Held for Sale
Derivatives Fair Value [Line Items]
Current derivative liabilities		$ 25	$ 3
[1]	Current derivative assets include $182 million and $63 million in other current assets in Dominion Energy’s Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, respectively.  The remainder is presented in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Derivatives and Hedge Accoun_13

Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Detail) - Cash Flow Hedges - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	[1]	$ (2)		$ 14	$ 29		$ (339)
Amount of Gain (Loss) Reclassified From AOCI to Income		(14)		(251)	(47)		(287)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	9		62	198		(488)
Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	[3]	(2)		6	24		(53)
Amount of Gain (Loss) Reclassified From AOCI to Income		(1)		(1)	(2)		(2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[4]	8		60	194		(492)
Commodity contracts
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income				8	(1)		21
Commodity contracts | Operating Revenue
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income				8			22
Commodity contracts | Discontinued operations
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income							2
Commodity contracts | Purchased Gas
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income					(1)		(3)
Interest rate contracts
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	[1]	(2)	[5]	8	29	[5]	(328)
Amount of Gain (Loss) Reclassified From AOCI to Income		(14)	[5]	(253)	(46)	[5]	(302)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	9	[5]	62	198	[5]	(488)
Interest rate contracts | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	[3],[6]	(2)		6	24		(53)
Amount of Gain (Loss) Reclassified From AOCI to Income	[6]	(1)		(1)	(2)		(2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[4],[6]	$ 8		60	$ 194		(492)
Interest rate contracts | Interest and Related Charges
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income				(23)			(66)
Interest rate contracts | Discontinued operations
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income				(230)			(236)
Foreign Exchange Contract
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives	[1],[7]			6			(11)
Amount of Gain (Loss) Reclassified From AOCI to Income	[7]			$ (6)			$ (6)
[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 deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income.
[4]	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.
[5]	Amounts recorded in Dominion Energy’s Consolidated Statement of Income are classified in interest and related charges.
[6]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[7]	Amounts recorded in Dominion Energy’s Consolidated Statement of Income are classified in discontinued operations.

Derivatives and Hedge Accoun_14

Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Detail) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	$ (285)	$ 52	$ (340)	$ (66)
Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]	23	(6)	(20)	(79)
Commodity contracts | Operating Revenue
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	(334)	(15)	(521)	31
Commodity contracts | Operating Revenue | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]	(19)	0	(25)	0
Commodity contracts | Purchased Gas
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	25	4	32	(6)
Commodity contracts | Electric Fuel and Other Energy-Related Purchases
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	44	(6)	7	(79)
Commodity contracts | Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]	42	(6)	5	(79)
Commodity contracts | Discontinued operations
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	0	(1)	0	4
Interest rate contracts | Interest and Related Charges
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	(20)	57	142	(21)
Interest rate contracts | Discontinued operations
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	0	5	0	(3)
Foreign Exchange Contract | Discontinued operations
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	$ 0	$ 8	$ 0	$ 8
[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.
[2]	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.

Investments (Narrative) (Detail

Investments (Narrative) (Detail) - USD ($)		1 Months Ended		3 Months Ended		9 Months Ended
		Nov. 30, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule Of Debt And Equity Securities [Line Items]
Earnings (loss) from equity method investees				$ 69,000,000	$ (5,000,000)	$ 214,000,000	$ 0
Net losses from discontinued operations including noncontrolling interest	[1],[2]			65,000,000	19,000,000	119,000,000	(1,753,000,000)
Distributions received from investment						263,000,000	25,000,000
Equity method affiliates includes cash and accrued amounts of contributions						1,000,000,000	93,000,000
Acquisition of equity method affiliates							178,000,000
Equity method investment goodwill				27,000,000		27,000,000		$ 27,000,000
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest				636,000,000	2,000,000	2,050,000,000	390,000,000
Contributions to equity method affiliates						1,006,000,000	92,000,000
Current liabilities				1,050,000,000		1,050,000,000		625,000,000	[3]
Credit facility, amount borrowed				900,000,000		900,000,000
Guarantee liability	[4]			3,851,000,000		3,851,000,000
Revenue				3,434,000,000	$ 3,536,000,000	10,358,000,000	$ 10,350,000,000
Assets				9,298,000,000		9,298,000,000		6,886,000,000	[3]
Liabilities				13,223,000,000		13,223,000,000		10,843,000,000	[3]
Retail Energy Marketing Operations
Schedule Of Debt And Equity Securities [Line Items]
Assets				81,000,000		81,000,000		63,000,000
Liabilities				21,000,000		21,000,000		15,000,000
Cove Point
Schedule Of Debt And Equity Securities [Line Items]
Ownership interest percentage of general partners		100.00%
Fowler Ridge
Schedule Of Debt And Equity Securities [Line Items]
Percentage of equity interest sold to noncontrolling interest owners			50.00%		50.00%		50.00%
Net payment of long-term power and capacity contract			$ 150,000,000
Contract termination loss					$ 221,000,000		$ 221,000,000
Contract termination loss net of tax					165,000,000		165,000,000
Maximum
Schedule Of Debt And Equity Securities [Line Items]
Earnings (loss) from equity method investees							1,000,000
Atlantic Coast Pipeline
Schedule Of Debt And Equity Securities [Line Items]
Net losses from discontinued operations including noncontrolling interest						(19,000,000)	(2,300,000,000)
Contributions to equity method affiliates				0	45,000,000	965,000,000	74,000,000
Atlantic Coast Pipeline | Dominion Energy Transmission Inc
Schedule Of Debt And Equity Securities [Line Items]
Revenue					7,000,000		44,000,000
Atlantic Coast Pipeline | Financial Guarantee
Schedule Of Debt And Equity Securities [Line Items]
Guarantee liability								6,000,000
Atlantic Coast Pipeline | Revolving Credit Facility
Schedule Of Debt And Equity Securities [Line Items]
Credit facility, amount borrowed								1,800,000,000
Atlantic Coast Pipeline | Other Current Liabilities
Schedule Of Debt And Equity Securities [Line Items]
Current liabilities				112,000,000		112,000,000		1,100,000,000
Cove Point
Schedule Of Debt And Equity Securities [Line Items]
Distributions received from investment				85,000,000		235,000,000
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest				136,000,000	$ 132,000,000	410,000,000	$ 396,000,000
Contributions to equity method affiliates				0		0
Cove Point | Cove Point | GT&S Transaction
Schedule Of Debt And Equity Securities [Line Items]
Percentage of limited partner interest sold		25.00%
Percentage of noncontrolling limited partnership interest retained		50.00%
Finite Lived Equity Method Investment Basis Difference
Schedule Of Debt And Equity Securities [Line Items]
Carrying amount of investment that exceeded share of underlying equity				231,000,000		231,000,000		213,000,000
Equity method investment goodwill				(18,000,000)		(18,000,000)		(41,000,000)
Finite Lived Equity Method Investment Basis Difference | Cove Point
Schedule Of Debt And Equity Securities [Line Items]
Equity method investment goodwill				222,000,000		222,000,000		227,000,000
Trading Securities
Schedule Of Debt And Equity Securities [Line Items]
Rabbi trust securities				$ 122,000,000		$ 122,000,000		$ 134,000,000
[1]	Includes income tax expense (benefit) of $(6) million and $(10) million for the three months ended September 30, 2021 and 2020, respectively, and $5 million and $(572) million for the nine months ended September 30, 2021 and 2020, respectively.
[2]	See Note 10 for amounts attributable to related parties.
[3]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[4]	Excludes Dominion Energy's guarantees for the new corporate office property and an offshore wind installation vessel discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020.

Investments (Equity and Fixed I

Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Fixed income securities Fair Value		$ 2,523
Amortized Cost, Total		4,207	$ 3,846
Total Unrealized Gains		3,339	3,081
Total Unrealized Losses	[1]	(40)	(27)
Allowance for Credit Losses, Total		0	0
Fair Value, Total		7,506	6,900	[2]
Net assets related to pending purchases of securities		48	49
Fair value of securities in an unrealized loss position		846	293
Virginia Electric and Power Company
Investment Holdings [Line Items]
Fixed income securities Fair Value		1,193
Amortized Cost, Total		1,986	1,789
Total Unrealized Gains		1,534	1,429
Total Unrealized Losses	[3]	(13)	(21)
Allowance for Credit Losses, Total		0	0
Fair Value, Total		3,507	3,197	[4]
Net assets related to pending purchases of securities		2	10
Fair value of securities in an unrealized loss position		397	142
Common/collective trust funds | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	187	170
Fixed income securities Total Unrealized Gains	[5]	5	5
Fixed income securities Total Unrealized Losses	[5]	0	0
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	192	175
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	54	58
Fixed income securities Total Unrealized Gains	[5]	0	0
Fixed income securities Total Unrealized Losses	[5]	0	0
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	54	58
Equity securities: | U.S.
Investment Holdings [Line Items]
Equity securities Amortized Cost	[6]	1,546	1,756
Equity securities Total Unrealized Gains	[6]	3,247	2,948
Equity securities Total Unrealized Losses	[6]	(11)	(24)
Equity securities Fair Value	[6]	4,782	4,680
Equity securities: | U.S. | Virginia Electric and Power Company
Investment Holdings [Line Items]
Equity securities Amortized Cost	[6]	829	929
Equity securities Total Unrealized Gains	[6]	1,497	1,371
Equity securities Total Unrealized Losses	[6]	(10)	(21)
Equity securities Fair Value	[6]	2,316	2,279
Corporate debt instruments | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	842	572
Fixed income securities Total Unrealized Gains	[5]	40	58
Fixed income securities Total Unrealized Losses	[5]	(3)	(1)
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	879	629
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	497	315
Fixed income securities Total Unrealized Gains	[5]	21	33
Fixed income securities Total Unrealized Losses	[5]	(1)	0
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	517	348
Government Securities | Fixed Income
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	1,414	1,119
Fixed income securities Total Unrealized Gains	[5]	44	66
Fixed income securities Total Unrealized Losses	[5]	(6)	(1)
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	1,452	1,184
Government Securities | Fixed Income | Virginia Electric and Power Company
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total	[5]	608	484
Fixed income securities Total Unrealized Gains	[5]	16	25
Fixed income securities Total Unrealized Losses	[5]	(2)
Fixed income securities Allowance for Credit Losses	[5]	0	0
Fixed income securities Fair Value	[5]	622	509
Insurance Contracts
Investment Holdings [Line Items]
Fixed income securities Amortized Cost, Total		246	237
Fixed income securities Total Unrealized Gains			0
Fixed income securities Total Unrealized Losses			0
Fixed income securities Fair Value		246	237
Cash equivalents and other
Investment Holdings [Line Items]
Cash equivalents and other, Amortized Cost	[7]	(28)	(8)
Cash equivalents and other, Total Unrealized Gains	[7]	3	4
Cash equivalents and other, Total Unrealized Losses	[7]	(20)	(1)
Cash equivalents and other, Allowance for Credit Losses	[7]	0	0
Cash equivalents and other, Fair Value	[7]	(45)	(5)
Cash equivalents and other | Virginia Electric and Power Company
Investment Holdings [Line Items]
Cash equivalents and other, Amortized Cost	[8]	(2)	3
Cash equivalents and other, Allowance for Credit Losses	[8]	0	0
Cash equivalents and other, Fair Value	[8]	$ (2)	$ 3
[1]	The fair value of securities in an unrealized loss position was $846 million and $293 million at September 30, 2021 and December 31, 2020, respectively.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	The fair value of securities in an unrealized loss position was $397 million and $142 million
[4]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[5]	Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Changes in allowance for credit losses are included in other income.
[6]	Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[7]	Includes pending purchases of securities of $48 million and $49 million at September 30, 2021 and December 31, 2020, respectively.
[8]	Includes pending purchases of securities o f $ 2 million an d $ 10 million at September 30, 2021 and December 31, 2020, respectively.

Investments (Portion of Unreali

Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investment Holdings [Line Items]
Net gains (losses) recognized during the period		$ (15)	$ 308	$ 616	$ 20
Less: Net (gains) losses recognized during the period on securities sold during the period		(11)	(15)	(323)	(6)
Unrealized gains (losses) recognized during the period on securities still held at period end	[1]	(26)	293	293	14
Virginia Electric and Power Company
Investment Holdings [Line Items]
Net gains (losses) recognized during the period		6	138	319	(16)
Less: Net (gains) losses recognized during the period on securities sold during the period		(9)	(6)	(182)	(3)
Unrealized gains (losses) recognized during the period on securities still held at period end	[1]	$ (3)	$ 132	$ 137	$ (19)
[1]	Included in other income and the nuclear decommissioning trust regulatory liability.

Investments (Fair Value of Fixe

Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions	Sep. 30, 2021USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	$ 351
Due after one year through five years	667
Due after five years through ten years	654
Due after ten years	851
Total	2,523
Virginia Electric and Power Company
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	83
Due after one year through five years	354
Due after five years through ten years	372
Due after ten years	384
Total	$ 1,193

Investments (Selected Informati

Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales		$ 614	$ 1,208	$ 3,324	$ 2,868
Realized gains	[1]	25	48	405	188
Realized losses	[1]	7	29	81	159
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales		216	164	1,465	694
Realized gains	[1]	17	18	213	73
Realized losses	[1]	$ 2	$ 10	$ 28	$ 58
[1]	Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

Schedule of Acquisitions of Sol

Schedule of Acquisitions of Solar Projects (Detail) $ in Millions		9 Months Ended
		Sep. 30, 2021USD ($)MW	Sep. 30, 2020USD ($)
Property Plant And Equipment [Line Items]
Project Cost		$ 87	$ 245
Acquisition of Nonregulated Solar Project Trask in South Carolina
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-05
Date Agreement Closed		2020-10
Project Cost	[1]	$ 22
Date of Commercial Operations		March 2021
MW Capacity | MW		12
Acquisition of Nonregulated Solar Project Hardin II in Ohio
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-08
Project Cost	[1]	$ 295
Date of Commercial Operations		Expected 2022
MW Capacity | MW		150
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Project Cost		$ 61	$ 26
Virginia Electric and Power Company | Acquisition of Nonregulated Solar Project Bookers Mill in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2021-02
Date Agreement Closed		2021-06
Project Cost	[1]	$ 200
Date of Commercial Operations		Expected 2023
MW Capacity | MW		127
Virginia Electric and Power Company | Acquisition of Nonregulated Solar Project Belcher in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2019-06
Date Agreement Closed		2019-08
Project Cost	[1]	$ 164
Date of Commercial Operations		June 2021
MW Capacity | MW		88
[1]	Includes acquisition cost

Property, Plant and Equipment (

Property, Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 30, 2021USD ($)	Aug. 31, 2021USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)MW	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Property Plant And Equipment [Line Items]
Property, plant and equipment			$ 58,386		$ 58,386		$ 57,848	[1]
Impairment of assets and other charges (benefits)			(222)	$ 1,151	194	$ 1,963
Dominion Energy
Property Plant And Equipment [Line Items]
Impairment of assets and other charges (benefits)				665		665
Asset impairment charges after tax				293		293
Impairment of assets and other charges attributable to noncontrolling interest				267		267
Property, plant and equipment down to estimated fair value						1,400
Terra Nova Renewable Partners | Nonregulated Solar Projects | SBL Holdco
Property Plant And Equipment [Line Items]
Percentage of controlling interest		67.00%
Consideration		$ 456
Gain (loss) on held for sale					30
Gain (loss) on held for sale, after tax					31
Property, plant and equipment			743		743
Long-term debt			339		339
Clearway | Four Brothers and Three Cedars
Property Plant And Equipment [Line Items]
Percentage of controlling interest		50.00%
Consideration		$ 335
Gain (loss) on held for sale					225
Gain (loss) on held for sale, after tax					170
Property, plant and equipment			744		744
Long-term debt			75		75
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Property, plant and equipment			33,876		33,876		$ 32,569	[2]
Impairment of assets and other charges (benefits)			(230)	$ 200	(269)	$ 1,008
Virginia Electric and Power Company | Virginia Regulation
Property Plant And Equipment [Line Items]
Impairment of assets and other charges (benefits)			318
Wexpro | Scenario Forecast
Property Plant And Equipment [Line Items]
Asset acquisition, total consideration	$ 41
Acquisition of Solar Project at Schools in Virginia
Property Plant And Equipment [Line Items]
Anticipated projected cost			$ 65		$ 65
Aggregate generation capacity | MW					32
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Regulatory Assets and Liabili_3

Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Regulatory assets-current		$ 1,193		$ 1,193	$ 699	[1]
Regulatory assets-noncurrent		9,213		9,213	9,133	[1]
Total regulatory assets		10,406		10,406	9,832
Asset retirement obligations increase (decrease)				$ (252)
Weighted Average
Regulatory Assets [Line Items]
Weighted average useful life				27 years
SCANA
Regulatory Assets [Line Items]
Electric service customers over period				20 years
Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current		690		$ 690	295	[2]
Regulatory assets-noncurrent		3,941		3,941	3,509	[2]
Total regulatory assets		4,631		$ 4,631	3,804
Virginia Electric and Power Company | Weighted Average
Regulatory Assets [Line Items]
Weighted average useful life				25 years
DESC
Regulatory Assets [Line Items]
Write off of regulatory asset			$ 237
Write off of regulatory asset, after tax			$ 178
Deferred cost of fuel used in electric generation
Regulatory Assets [Line Items]
Regulatory assets-current	[3]	147		$ 147
Regulatory assets-noncurrent	[3]	139		139
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[4]	147		147
Regulatory assets-noncurrent	[4]	139		139
Deferred project costs and DSM programs for gas utilities
Regulatory Assets [Line Items]
Regulatory assets-current	[5]	37		37	35
Unrecovered gas costs
Regulatory Assets [Line Items]
Regulatory assets-current	[6]	161		161	78
Deferred rider costs for Virginia electric utility
Regulatory Assets [Line Items]
Regulatory assets-current	[7]	49		49	98
Regulatory assets-noncurrent	[7]	442		442	311
Deferred nuclear refueling outage costs
Regulatory Assets [Line Items]
Regulatory assets-current	[8]	70		$ 70	53
Deferred nuclear refueling outage costs | Maximum
Regulatory Assets [Line Items]
Amortization period for deferred costs				18 months
Deferred nuclear refueling outage costs | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[8]	70		$ 70	53
Deferred nuclear refueling outage costs | Virginia Electric and Power Company | Maximum
Regulatory Assets [Line Items]
Amortization period for deferred costs				18 months
PJM transmission rates
Regulatory Assets [Line Items]
Regulatory assets-current	[9]	9		$ 9	71
PJM transmission rates | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[9]	9		9	71
Other
Regulatory Assets [Line Items]
Regulatory assets-current		195		195	193
Regulatory assets-noncurrent		605		605	544
Other | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current		36		36	33
Regulatory assets-noncurrent		177		177	164
Deferred early plant retirement charges
Regulatory Assets [Line Items]
Regulatory assets-current	[10]	226		226
Regulatory assets-noncurrent	[10]	282		282
Deferred early plant retirement charges | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[11]	226		226
Regulatory assets-noncurrent	[11]	282		282
Derivatives
Regulatory Assets [Line Items]
Regulatory assets-current	[12]	161		161	33
Derivatives | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[12]	153		153	40
NND Project Costs
Regulatory Assets [Line Items]
Regulatory assets-current	[13]	138		138	138
Regulatory assets-noncurrent	[13]	2,261		2,261	2,364
Pension and Other Postretirement Benefit Costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[14]	1,274		1,274	1,363
Deferred project costs for gas utilities
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[5]	668		668	632
Interest rate hedges
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[15]	838		838	1,042
Interest rate hedges | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[16]	540		540	733
AROs and related funding
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[17]	332		$ 332	331
Amortization period for deferred costs				105 years
Cost of reacquired debt
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[18]	11		$ 11	245
Ash pond and landfill closure costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[19]	2,361		$ 2,361	2,301
Ash pond and landfill closure costs | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets expected collection period commencing month and year				2021-12
Ash pond and landfill closure costs | Maximum | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets amounts expected collection period				18 years
Ash pond and landfill closure costs | Minimum | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets amounts expected collection period				15 years
Ash pond and landfill closure costs | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[19]	2,361		$ 2,361	2,301
Ash pond and landfill closure costs | Virginia Electric and Power Company | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets expected collection period commencing month and year				2021-12
Ash pond and landfill closure costs | Virginia Electric and Power Company | Maximum | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets amounts expected collection period				18 years
Ash pond and landfill closure costs | Virginia Electric and Power Company | Minimum | Rider CCR
Regulatory Assets [Line Items]
Regulatory assets amounts expected collection period				15 years
Revision of Certain Gas Distribution Pipeline
Regulatory Assets [Line Items]
Asset retirement obligations increase (decrease)		66
Deferred rider costs | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[20]	49		$ 49	98
Regulatory assets-noncurrent	[20]	$ 442		$ 442	$ 311
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[4]	Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[5]	Primarily
[6]	Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority.
[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. 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 current portion of amounts to be recovered through retail rates in Virginia for payments Virginia Power expects to make to PJM through 2026 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter.
[10]	Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review. See Note 13 for additional information.
[11]	Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the proposed settlement of the 2021 Triennial Review.  See Note 13 for additional information.
[12]	For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers.
[13]	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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information.
[14]	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.
[15]	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 September 30, 2021.
[16]	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 25 years as of September 30, 2021.
[17]	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 years .
[18]	During the second quarter of 2021, DESC recorded a charge of $237 million ($178 million after-tax) in impairment of assets and other charges to write-off the balance of a regulatory asset that is no longer probable of recovery under the settlement agreement approved in DESC’s retail electric base rate case.  See Note 13 for more information.
[19]	Primarily reflects legislation enacted in Virginia in 2019, which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 13 for additional information.
[20]	Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects. See Note 13 for more information.

Regulatory Assets and Liabili_4

Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 1,059	$ 809	[1]
Regulatory liabilities-noncurrent		10,346	10,187	[1]
Total regulatory liabilities		11,405	10,996
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		685	425	[2]
Regulatory liabilities-noncurrent		5,560	5,338	[2]
Total regulatory liabilities		6,245	5,763
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	183	183
Regulatory liabilities-noncurrent	[3]	2,321	2,150
Provision for future cost of removal and AROs | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	152	152
Reserve for refunds to electric utility customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	422	128
Regulatory liabilities-noncurrent	[5]	480	540
Cost-of-service impact of 2017 Tax Reform Act
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[6]		12
Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[7]	140	124
Regulatory liabilities-noncurrent	[7]	4,274	4,376
Income taxes refundable through future rates | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[8]	54	54
Regulatory liabilities-noncurrent	[8]	2,356	2,404
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[9]	1	58
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[10]	1	58
Regulatory liabilities-noncurrent	[10]		54
Monetization of guarantee settlement
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[11]	67	67
Regulatory liabilities-noncurrent	[11]	848	903
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		140	108
Regulatory liabilities-noncurrent		368	388
Other | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		87	33
Regulatory liabilities-noncurrent		173	181
Reserve for future credits to Virginia electric customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[12]		120
Reserve for future credits to Virginia electric customers | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[13]		120
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[14]	1,958	1,719
Nuclear decommissioning trust | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[15]	1,958	1,719
Commodity derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[16]	106	9
Overrecovered Other Postretirement Benefit Costs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[17]	97	111
Reserve for refunds to Virginia electric customers | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[12]	299
Regulatory liabilities-noncurrent	[13]	31
Derivatives | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[16]	92	8
Provision For Future Cost Of Removal | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[4]	$ 1,042	$ 980
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	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. Reflects an increase of $66 million associated with the revision of certain gas distribution pipeline AROs in the third quarter of 2021. See Note 2 for more information.
[4]	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.
[5]	Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period effective February 2019, in connection with the SCANA Merger Approval Order. See Notes 3 and 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review.  See Note 13 for additional information.
[6]	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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information.
[7]	Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will primarily 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]	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.
[9]	Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[10]	Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[11]	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 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information.
[12]	Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information.
[13]	Reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review.  See Note 13 for additional information.
[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, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs.
[15]	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.
[16]	For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers.
[17]	Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

Regulatory Assets and Liabili_5

Regulatory Assets and Liabilities (Narrative) (Detail) $ in Billions	9 Months Ended
	Sep. 30, 2021USD ($)
Public Utilities General Disclosures [Line Items]
Regulatory assets not expect to earn return	$ 4.5
Period for which expenditures are expected to be recovered	2 years
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Regulatory assets not expect to earn return	$ 3.3
Period for which expenditures are expected to be recovered	2 years

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Detail) $ in Millions

Nov. 01, 2021USD ($)

Sep. 01, 2021USD ($)

Nov. 30, 2021USD ($)

Oct. 31, 2021USD ($)

Sep. 30, 2021USD ($)MW

Aug. 31, 2021USD ($)

Jul. 31, 2021USD ($)

Jun. 30, 2021USD ($)ProjectComponent

May 31, 2021USD ($)

Apr. 30, 2021USD ($)

Mar. 31, 2021USD ($)

Feb. 28, 2021USD ($)

Jan. 31, 2021USD ($)

Dec. 31, 2020USD ($)program

Sep. 30, 2020USD ($)mi

Aug. 31, 2020USD ($)

Jul. 31, 2020USD ($)MW

Jun. 30, 2020USD ($)

Apr. 30, 2020USD ($)

Sep. 30, 2021USD ($)

Jun. 30, 2021USD ($)

Mar. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Sep. 30, 2020USD ($)

Mar. 31, 2020USD ($)

Dec. 31, 2020USD ($)

Sep. 30, 2021USD ($)

Sep. 30, 2020USD ($)

Dec. 31, 2022USD ($)

Mar. 31, 2022USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2008

Dec. 31, 2019USD ($)

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

$ (222)

$ 1,151

$ 194

$ 1,963

Other operations and maintenance

924

977

2,806

2,720

Regulatory assets

$ 10,406

$ 9,832

10,406

$ 9,832

$ 9,832

10,406

$ 9,832

South Carolina Regulation | South Carolina Electric Base Rate Case

Public Utilities General Disclosures [Line Items]

Return of equity percentage

5.90%

Increase (decrease) in revenue requirement

$ 62

$ 178

Increase (decrease) in revenue requirement, percentage

7.75%

Approved return on equity percentage

9.50%

10.25%

Public utilities, requested rate increase amortization of certain excess deferred income taxes

$ 36

Public utilities, retail electric customer balance

15

Public utilities energy efficiency upgrades and critical health and safety repairs

$ 15

Regulatory assets

$ 237

$ 237

South Carolina Regulation | South Carolina Electric Base Rate Case | Impairment of Assets and Other Charges (Benefits)

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

249

Asset impairment charges after tax

187

South Carolina Regulation | South Carolina Electric Base Rate Case | Other Income

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

18

Asset impairment charges after tax

$ 14

West Virginia Regulation | South Carolina Electric Base Rate Case

Public Utilities General Disclosures [Line Items]

Return of equity percentage

10.25%

Increase in gas cost

$ 28

Approved return on equity percentage

9.54%

9.45%

Approved increase in revenue required

$ 13

Public Utilities distribution infrastructure gathering assets | mi

2,000

Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

(230)

200

(269)

1,008

Proposed cost of project

1,400

Other operations and maintenance

393

456

1,140

$ 1,083

Regulatory assets

$ 4,631

3,804

4,631

3,804

3,804

4,631

3,804

Virginia Electric and Power Company | Utility Scale Solar Generation

Public Utilities General Disclosures [Line Items]

Targeted capacity provided by legislation | MW

661

Virginia Electric and Power Company | Energy Storage

Public Utilities General Disclosures [Line Items]

Targeted capacity provided by legislation | MW

70

Virginia Electric and Power Company | Subsequent Event

Public Utilities General Disclosures [Line Items]

Proposed cost of project

$ 3,900

Virginia Electric and Power Company | Subsequent Event | CVOW Commercial Project

Public Utilities General Disclosures [Line Items]

Estimated cost

$ 1,100

Approved annual revenue required

$ 79

Virginia Electric and Power Company | Impairment of Assets and Other Charges

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

$ 76

127

$ 754

Asset impairment charges after tax

56

$ 561

Virginia Electric and Power Company | GTSA | Impairment of Assets and Other Charges

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

130

Impairment of assets and other charges (benefits)

130

200

Impairment of assets and other charges (benefits) after tax

97

$ 149

Virginia Electric and Power Company | Grassfield Solar Norge Solar And Sycamore Solar

Public Utilities General Disclosures [Line Items]

Proposed cost of project

$ 170

Targeted capacity provided by legislation | MW

82

Virginia Electric and Power Company | Virginia Power North Carolina Fuel Filing

Public Utilities General Disclosures [Line Items]

Fuel Component of Electric Rates

$ 26

Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

318

Virginia Electric and Power Company | Virginia Regulation | Subsequent Event

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

330

Refund to customer over 6 month period

255

Refund to customer three years

75

Increase (Decrease) Over Previous Year

309

Virginia Electric and Power Company | Virginia Regulation | Impairment of Assets and Other Charges

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

318

Asset impairment charges after tax

237

Virginia Electric and Power Company | Virginia Regulation | Operating Revenue

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

350

Asset impairment charges after tax

261

Virginia Electric and Power Company | Virginia Regulation | Regulatory Asset Associated with Early Retirements

Public Utilities General Disclosures [Line Items]

Asset net impairment charge

549

Asset impairment charges after tax

$ 409

Virginia Electric and Power Company | Virginia Regulation | GTSA

Public Utilities General Disclosures [Line Items]

Number of electric distribution grid transformation projects | Project

14

Number of electric distribution grid transformation projects components | Component

6

Proposed cost of project

$ 669

Other operations and maintenance

110

Virginia Electric and Power Company | Virginia Regulation | Grassfield Solar Norge Solar And Sycamore Solar

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 10

Virginia Power | Mandatory Renewable Portfolio Standard Program

Public Utilities General Disclosures [Line Items]

Proposed cost of project

$ 13

Beginning date of total revenue requirement

Aug. 1, 2021

Approval date

2021-07

Virginia Power | Solar Generation and Energy Storage

Public Utilities General Disclosures [Line Items]

Increase (Decrease) Over Previous Year

$ 61

Proposed cost of project

71

Questar Gas Company | Utah Regulation

Public Utilities General Disclosures [Line Items]

Increase in gas cost

$ 43

Questar Gas Company | Utah Regulation | Subsequent Event

Public Utilities General Disclosures [Line Items]

Increase in gas cost

$ 83

Base Rate Case | Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Return of equity percentage

10.42%

10.85%

CVOWP project investment elected for CCRO to offset available revenues

$ 26

Authorized return percentage

9.20%

Requested authorized return on equity percentage

10.80%

Base Rate Case | Virginia Electric and Power Company | Virginia Regulation | Subsequent Event

Public Utilities General Disclosures [Line Items]

Authorized return percentage

9.35%

Increase (decrease) in revenue requirement

$ 50

Base Rate Case | PSNC

Public Utilities General Disclosures [Line Items]

Authorized return percentage

9.70%

Increase (decrease) in revenue requirement

$ 53

Increase (decrease) in revenue requirement in connection with federal and state income tax reductions

$ 42

Percentage of earned return

10.25%

Base Rate Case | PSNC | Subsequent Event

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement in connection with federal and state income tax reductions, initial rate year

4

Increase (decrease) in revenue requirement in connection with federal and state income tax reductions, second rate year

23

Increase (decrease) in revenue requirement in connection with federal and state income tax reductions, third through fifth rate year

$ 25

Return on equity percentage

9.60%

Increase in gas cost

$ 29

Recovery amount of operation and maintenance costs

$ 106

Recovery period of operation and maintenance costs

4 years

Annual Fuel Factor | Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 1,400

Rate year beginning

2021-07

Estimated under-recovered balances

$ 72

Rider U | Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

16

$ 28

Projected capital investment

96

80

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

Public Utilities General Disclosures [Line Items]

Projected capital investment

36

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

Public Utilities General Disclosures [Line Items]

Projected capital investment

61

$ 44

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

Public Utilities General Disclosures [Line Items]

Projected capital investment

35

Rider CCR | Virginia Electric and Power Company | Virginia Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 216

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

Public Utilities General Disclosures [Line Items]

Total revenue requirement

381

Approved annual revenue required

$ 190

Application date

2021-05

Beginning date of total revenue requirement

Sep. 1, 2021

Rider T1 | Virginia Electric and Power Company | Virginia Regulation | Transmission Component Of Virginia Powers | Operating Segments

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 493

Rider T1 | Virginia Electric and Power Company | FERC-regulated | Operating Segments

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 874

Rider GV | Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

21

Total revenue requirement

$ 153

Rate year beginning

2021-04

Application date

2020-06

Rider GV | Virginia Electric and Power Company | Rate Rider One

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 142

Beginning date of total revenue requirement

Apr. 1, 2022

Rider GV | Virginia Electric and Power Company | Rate Rider Two

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 127

Beginning date of total revenue requirement

Apr. 30, 2023

Rider R | Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 14

Total revenue requirement

$ 58

Rate year beginning

2021-04

Application date

2020-06

Rider R | Virginia Electric and Power Company | Rate Rider One

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 59

Beginning date of total revenue requirement

Apr. 1, 2022

Rider R | Virginia Electric and Power Company | Rate Rider Two

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 55

Beginning date of total revenue requirement

Apr. 1, 2023

Rider S | Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ (1)

Total revenue requirement

$ 194

Rate year beginning

2021-04

Application date

2020-06

Rider S | Virginia Electric and Power Company | Virginia City Hybrid Energy Center | Rate Rider One

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 192

Beginning date of total revenue requirement

Apr. 1, 2022

Rider S | Virginia Electric and Power Company | Virginia City Hybrid Energy Center | Rate Rider Two

Public Utilities General Disclosures [Line Items]

Total revenue requirement

$ 191

Beginning date of total revenue requirement

Apr. 1, 2023

Rider RGGI | Virginia Electric and Power Company | Virginia City Hybrid Energy Center | Rate Rider One

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 168

Beginning date of total revenue requirement

Sep. 1, 2021

Rider GT | Virginia Electric and Power Company | Virginia City Hybrid Energy Center | Rate Rider One

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 56

Beginning date of total revenue requirement

Jun. 1, 2022

Riders C1a C2a And C3a

Public Utilities General Disclosures [Line Items]

Number of new demand response programs | program

1

Riders C1a C2a And C3a | Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Amount of cost recovery

$ 162

Riders C1a C2a And C3a | Virginia Electric and Power Company | Virginia Regulation | Operating Segments | Energy Efficiency Program

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 78

Number of new energy efficiency programs | program

10

Period for cost cap

5 years

Rider C4A | Virginia Electric and Power Company

Public Utilities General Disclosures [Line Items]

Increase (Decrease) Over Previous Year

14

Rider C4A | Virginia Electric and Power Company | Virginia Regulation | Operating Segments | Energy Efficiency Program

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

74

Rider BW Year One | Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Operating Segments | Energy Efficiency Program

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 145

Rider BW Year Two | Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Operating Segments | Energy Efficiency Program

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

120

Rider SNA | Virginia Power | Virginia Regulation | Subsequent Event | Nuclear Life Extension Program

Public Utilities General Disclosures [Line Items]

Increase (Decrease) Over Previous Year

109

Approved annual revenue required

1,200

Pipeline Integrity and Safety Program | North Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

1

Total revenue requirement

$ 34

Rate year beginning

2021-10

Rider D | PSNC | North Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase in gas cost

$ 61

Rider DSM | Dominion Energy South Carolina Inc | South Carolina Regulation

Public Utilities General Disclosures [Line Items]

Application date

2021-01

Approval date

2021-04

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

$ 43

$ 48

Cost of Fuel | Dominion Energy South Carolina Inc | South Carolina Regulation

Public Utilities General Disclosures [Line Items]

Rate year beginning

2021-05

Application date

2021-02

Approval date

2021-04

Increase decrease in annual base fuel component recoveries

$ 36

Gas Rate Case | Dominion Energy South Carolina Inc | South Carolina Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

$ 9

Total revenue requirement

$ 426

Gas Rate Case | Dominion Energy South Carolina Inc | South Carolina Regulation | Subsequent Event

Public Utilities General Disclosures [Line Items]

Total revenue requirement

424

Approved increase in revenue required

$ 7

PIR Program | Ohio Regulation

Public Utilities General Disclosures [Line Items]

Approved annual revenue required

$ 243

Percentage of pipeline system replaced

25.00%

Total estimated cost

$ 178

178

178

178

Total cumulative estimated cost

$ 2,000

C E P Program | Ohio Regulation

Public Utilities General Disclosures [Line Items]

Total estimated cost

99

99

99

99

$ 137

Total cumulative estimated cost

$ 957

$ 957

$ 957

957

Proposed revenue requirement

$ 119

UEX Rider | Ohio Regulation

Public Utilities General Disclosures [Line Items]

Increase (decrease) in revenue requirement

20

Public utilities, under-recovered accumulated bad debt expense

$ 7

UEX Rider | Ohio Regulation | Scenario Forecast

Public Utilities General Disclosures [Line Items]

Recovery of bad debt expense

$ 13

PREP

Public Utilities General Disclosures [Line Items]

Rate year beginning

2021-11

Application date

2021-05

PREP | Hope Gas Inc | West Virginia Regulation

Public Utilities General Disclosures [Line Items]

Amount of cost recovery

$ 34

PREP | Hope Gas Inc | West Virginia Regulation | Scenario Forecast

Public Utilities General Disclosures [Line Items]

Projected capital investment

$ 56

$ 54

PREP | Hope Gas Inc | West Virginia Regulation | Subsequent Event

Public Utilities General Disclosures [Line Items]

Amount of cost recovery

$ 9

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Rider B
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 24
Increase (decrease) in revenue requirement	$ (8)
Rider GV
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 153
Increase (decrease) in revenue requirement	$ 21
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 58
Increase (decrease) in revenue requirement	$ 14
Rider S
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 194
Increase (decrease) in revenue requirement	$ (1)
Rider W
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 120
Increase (decrease) in revenue requirement	$ 14
Rider US-3
Public Utilities General Disclosures [Line Items]
Application Date	2020-07
Approval Date	March 2021
Rate Year Beginning	2021-06
Total Revenue Requirement (millions)	$ 38
Increase (decrease) in revenue requirement	$ 10
Rider US-4
Public Utilities General Disclosures [Line Items]
Application Date	2020-07
Approval Date	March 2021
Rate Year Beginning	2021-06
Total Revenue Requirement (millions)	$ 10
Increase (decrease) in revenue requirement	$ 3
Rider BW
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	July 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 113
Increase (decrease) in revenue requirement	$ 14
Rider US-2
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	July 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 9
Rider E
Public Utilities General Disclosures [Line Items]
Application Date	2021-01
Approval Date	September 2021
Rate Year Beginning	2021-11
Total Revenue Requirement (millions)	$ 67
Increase (decrease) in revenue requirement	$ (18)
Rider B
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 16
Increase (decrease) in revenue requirement	$ (8)
Rider W
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 121
Increase (decrease) in revenue requirement	$ 1
Rider US-3
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	Pending
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 50
Increase (decrease) in revenue requirement	$ 12
Rider US-4
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	Pending
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 15
Increase (decrease) in revenue requirement	$ 5
Rider US-2
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 11
Increase (decrease) in revenue requirement	$ 2

Regulatory Matters - Summary of

Regulatory Matters - Summary of Significant Virginia Power Electric Transmission Projects Applied (Detail) - Virginia Electric and Power Company $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)kVmi
Rebuild Clubhouse-Dry Bread Line and Dry Bread-Lakeview Line in Greensville County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2020-11
Approval Date	July 2021
Type of Line | kV	230
Miles of Lines | mi	13
Cost Estimate | $	$ 25
Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-04
Approval Date	Pending
Type of Line | kV	500
Miles of Lines | mi	26
Cost Estimate | $	$ 95
Beaumeade-Belmont reconductor and rebuild projects in the County of Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-05
Approval Date	Pending
Type of Line | kV	230
Miles of Lines | mi	7
Cost Estimate | $	$ 15
Extension to Cloud Switching Station and Easters Switching Station in the County of Mecklenburg, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Type of Line | kV	230
Miles of Lines | mi	15
Cost Estimate | $	$ 105

Leases (Narrative) (Detail)

Leases (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019
Lessor | New 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						$ 465
Leasing arrangement, charge		$ 71
Leasing arrangement, charge after tax		$ 53
Lease effective termination date		2021-04
Power Purchase Arrangement
Leases Disclosure [Line Items]
Rental revenue	$ 58		$ 61	$ 147	$ 146
Depreciation expense	$ 29		$ 26	$ 87	$ 76

Variable Interest Entities - (N

Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Current liabilities held for sale	$ 1,050		$ 1,050		$ 625	[1]
Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Long-term debt	12,462		12,462		13,207	[2]
Payables to affiliates	139		139		266	[2]
Variable Interest Entity, Primary Beneficiary | SBL Holdco
Variable Interest Entity [Line Items]
Current liabilities held for sale	264		264
Securities due within one year	32		32
Long-term debt					239
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES
Variable Interest Entity [Line Items]
Shared Services Purchased	89	$ 81	278	$ 260
Payables to affiliates	$ 24		$ 24		$ 175
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Significant Financing Transac_3

Significant Financing Transactions (Narrative) (Detail)		1 Months Ended									3 Months Ended			9 Months Ended		12 Months Ended
		Nov. 30, 2021USD ($)	Aug. 31, 2021USD ($)shares	Jul. 31, 2021USD ($)shares	Jun. 30, 2021USD ($)	Apr. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Sep. 30, 2020USD ($)agreementshares	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2021USD ($)	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Dec. 31, 2020USD ($)shares		Nov. 30, 2020USD ($)	Jul. 31, 2020USD ($)
Debt Instrument [Line Items]
Facility Limit	[1]											$ 6,000,000,000		$ 6,000,000,000
Credit facility, amount borrowed												900,000,000		900,000,000
Short-term debt												3,885,000,000		3,885,000,000		$ 895,000,000	[2]
Debt, amount redeemed			$ 39,000,000
Other long-term debt												$ 849,000,000		$ 849,000,000		881,000,000	[2]
Preferred stock shares authorized | shares												20,000,000		20,000,000
Stock purchase contract liability												$ 65,000,000		$ 65,000,000		129,000,000
Corporate units stock purchase contract liability payments														64,000,000	$ 62,000,000
Issuance of common stock														144,000,000	159,000,000
Issuance of stock												$ 195,000,000	$ 333,000,000	$ 292,000,000	481,000,000
Stock repurchased, value													2,385,000,000		2,385,000,000
Number of prepaid accelerated share repurchase agreements | agreement								2
Decrease in common stock													1,500,000,000
Common stock worth based on closing Price								$ 1,500,000,000					$ 1,500,000,000		$ 1,500,000,000
Common Stock
Debt Instrument [Line Items]
Issuance of stock (in shares) | shares			600,000	1,400,000				4,100,000				3,000,000	4,000,000	4,000,000	6,000,000
Issuance of stock			$ 45,000,000	$ 104,000,000								$ 195,000,000	$ 333,000,000	$ 292,000,000	$ 481,000,000
Stock repurchase program, authorized amount																		$ 1,000,000,000	$ 3,000,000,000
Stock repurchased, shares | shares								4,100,000					28,000,000	0	28,000,000
Stock repurchased, value								$ 323,000,000					$ 2,385,000,000		$ 2,385,000,000
Accelerated share repurchase, payments								$ 1,500,000,000					$ 1,500,000,000		$ 1,500,000,000
Accelerated share repurchase, cash paid for number of shares exchange | shares								17,200,000					17,200,000		17,200,000
Common Stock | Open Market Agreement
Debt Instrument [Line Items]
Stock repurchased, shares | shares													7,200,000
Stock repurchased, value													$ 562,000,000
Series A Preferred Stock
Debt Instrument [Line Items]
Recorded dividend												$ 7,000,000	$ 7,000,000	$ 21,000,000	$ 21,000,000
Recorded dividends per share | $ / shares												$ 4.375	$ 4.375	$ 13.125	$ 13.125
Conversion of stock, description														Series A Preferred Stock be settled, at Dominion Energy’s election, either entirely in cash or in cash up to the first $1,000 per share and in shares of Dominion Energy common stock, cash or any combination thereof for any amounts in excess of $1,000 per share.
Series A Preferred Stock | Scenario Forecast
Debt Instrument [Line Items]
Reclassifications of permanent to mezzanine equity											$ 1,600,000
Series B Preferred Stock
Debt Instrument [Line Items]
Recorded dividend												$ 9,000,000	$ 9,000,000	$ 27,000,000	$ 27,000,000
Recorded dividends per share | $ / shares												$ 11.625	$ 11.625	$ 34.875	$ 34.875
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative notional value									$ 2,000,000,000
Derivative maturity month and year									2024-12
Other long-term debt																326,000,000
Various Programs
Debt Instrument [Line Items]
Issuance of common stock														$ 292,000,000	$ 481,000,000
Issuance of stock (in shares) | shares														4,000,000	6,200,000
Floating Rate Demand Notes
Debt Instrument [Line Items]
Short-term debt												$ 391,000,000		$ 391,000,000		268,000,000
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes
Debt Instrument [Line Items]
Facility Limit																3,000,000,000
Senior Notes Due in 2051 | PSNC
Debt Instrument [Line Items]
Total Long-term Debt							$ 150,000,000
Interest rate percentage							3.10%
Debt maturity year							2051
Senior Notes Due in 2026
Debt Instrument [Line Items]
Total Long-term Debt						$ 600,000,000
Interest rate percentage						1.45%
Debt maturity year						2026
Senior Notes Due in 2041
Debt Instrument [Line Items]
Total Long-term Debt						$ 500,000,000
Interest rate percentage						3.30%
Debt maturity year						2041
2.0% Senior Notes Due August 2021
Debt Instrument [Line Items]
Debt maturity month and year				2021-08
Interest rate percentage				2.00%
Debt, amount redeemed				$ 400,000,000
Senior Notes Due in 2031
Debt Instrument [Line Items]
Total Long-term Debt			$ 1,000,000,000
Interest rate percentage			2.25%
Debt maturity year			2031
July 2016 Hybrids | Unsecured Junior Subordinated Notes
Debt Instrument [Line Items]
Debt maturity year			2076
Debt, amount redeemed			$ 800,000,000
Expenses related to early redemption of hybrids			23,000,000
DESC
Debt Instrument [Line Items]
Facility Limit												500,000,000		500,000,000
Short-term indebtedness outstanding							$ 2,200,000,000
Debt maturity month and year							2023-03
DESC | 3.22% First Mortgage Bond Due October 2021
Debt Instrument [Line Items]
Debt maturity month and year				2021-10
Interest rate percentage				3.22%
Debt, amount redeemed				$ 30,000,000
Questar Gas
Debt Instrument [Line Items]
Facility Limit												250,000,000		250,000,000
Questar Gas | 2.21% Senior Notes Due In 2031
Debt Instrument [Line Items]
Total Long-term Debt			$ 125,000,000
Interest rate percentage			2.21%
Debt maturity year			2031
Questar Gas | 3.15% Senior Notes Due In 2051
Debt Instrument [Line Items]
Total Long-term Debt			$ 125,000,000
Interest rate percentage			3.15%
Debt maturity year			2051
GENCO
Debt Instrument [Line Items]
Short-term indebtedness outstanding							$ 200,000,000
Debt maturity month and year							2023-03
SBL Holdco | Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023
Debt Instrument [Line Items]
Facility Limit												30,000,000		$ 30,000,000
Automatic renewal period														1 year
Short-term debt												0		$ 0		0
Dominion Solar Projects III, Inc | Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024
Debt Instrument [Line Items]
Facility Limit												25,000,000		$ 25,000,000
Automatic renewal period														1 year
Short-term debt												0		$ 0		0
Virginia Electric and Power Company
Debt Instrument [Line Items]
Facility Limit	[3]											6,000,000,000		6,000,000,000
Short-term debt												896,000,000		896,000,000		45,000,000	[4]
Other long-term debt												$ 495,000,000		$ 495,000,000		480,000,000	[4]
Issuance of stock (in shares) | shares												0	0	0	0
Virginia Electric and Power Company | Interest Rate Swaps
Debt Instrument [Line Items]
Derivative notional value			$ 900,000,000
Derivative maturity month and year			2023-12
Other long-term debt																$ 443,000,000
Virginia Electric and Power Company | 2.95% Senior Notes Due In January 2022
Debt Instrument [Line Items]
Debt maturity month and year		2022-01
Interest rate percentage		2.95%
Debt, amount redeemed		$ 450,000,000
Dominion Energy
Debt Instrument [Line Items]
Preferred stock shares issued | shares												2,400,000		2,400,000		2,400,000
Preferred stock shares outstanding | shares												2,400,000		2,400,000		2,400,000
Dominion Energy | Series A Preferred Stock
Debt Instrument [Line Items]
Preferred stock shares issued | shares												1,600,000		1,600,000		1,600,000
Preferred stock shares outstanding | shares												1,600,000		1,600,000		1,600,000
Dominion Energy | Series B Preferred Stock
Debt Instrument [Line Items]
Preferred stock shares issued | shares												800,000		800,000		800,000
Preferred stock shares outstanding | shares												800,000		800,000		800,000
New Joint Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit					$ 6,000,000,000
Letter of Credit
Debt Instrument [Line Items]
Facility Limit												$ 2,000,000,000		$ 2,000,000,000
Letter of Credit | Credit Facility, Maturing in June 2022
Debt Instrument [Line Items]
Facility Limit												30,000,000		30,000,000
Credit facility, amount borrowed												29,000,000		$ 29,000,000		$ 30,000,000
Line of credit facility, maturity date														Jun. 30, 2022
Letter of Credit | Virginia Electric and Power Company
Debt Instrument [Line Items]
Facility Limit												2,000,000,000		$ 2,000,000,000
364-Day Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit										$ 900,000,000
Short-term debt																$ 225,000,000
Debt Instrument Term										364 days				364 days		364 days
Term Loan Credit Agreement
Debt Instrument [Line Items]
Facility Limit				$ 1,300,000,000
Sustainability Revolving Credit Agreement | Credit Facility, Maturing in June 2024
Debt Instrument [Line Items]
Facility Limit					$ 900,000,000
Credit facility, amount borrowed												$ 900,000,000		$ 900,000,000
Line of credit facility, maturity date					Jun. 30, 2024
Fund used for environmental sustainability and social investment initiatives					$ 250,000,000
Fund used for general corporate purposes					$ 650,000,000
[1]	This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At September 30, 2021, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Significant Financing Transac_4

Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Detail)	Sep. 30, 2021USD ($)
Line of Credit Facility [Line Items]
Facility Limit	$ 6,000,000,000	[1]
Outstanding Commercial Paper	3,494,000,000	[1]
Outstanding Letters of Credit	99,000,000	[1]
Facility Capacity Available	2,407,000,000	[1]
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	6,000,000,000	[2]
Outstanding Commercial Paper	896,000,000	[2]
Outstanding Letters of Credit	$ 12,000,000	[2]
[1]	This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At September 30, 2021, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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.

Significant Financing Transac_5

Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail)	Sep. 30, 2021USD ($)
Line of Credit Facility [Line Items]
Facility Limit	$ 6,000,000,000	[1]
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	6,000,000,000	[2]
Letter of Credit
Line of Credit Facility [Line Items]
Facility Limit	2,000,000,000
Letter of Credit | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	2,000,000,000
Line of Credit | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	$ 1,750,000,000
[1]	This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At September 30, 2021, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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.

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Detail) shares in Millions, $ in Millions

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

Aug. 31, 2021shares

Jul. 31, 2021USD ($)shares

Jun. 30, 2021USD ($)

Dec. 31, 2020USD ($)

Oct. 31, 2020

Sep. 30, 2020USD ($)

Aug. 31, 2020USD ($)

Jul. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Jul. 31, 2019USD ($)

Aug. 31, 2018USD ($)

Jun. 30, 2018USD ($)

Aug. 31, 2017USD ($)

Apr. 30, 2017Petition

Aug. 31, 2016T

Sep. 30, 2021USD ($)

Sep. 30, 2020USD ($)

Sep. 30, 2021USD ($)IndicatorFacilitysitegal

Sep. 30, 2020USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2018USD ($)

Mar. 31, 2020USD ($)

Loss Contingencies [Line Items]

Impairment of assets and other charges

$ (222)

$ 1,151

$ 194

$ 1,963

Property, plant and equipment, net

$ 57,848

[1]

58,386

58,386

$ 57,848

[1]

Common Stock

Loss Contingencies [Line Items]

Litigation settlement, benefit fund

$ 320

Litigation settlement amount through stock issuance

$ 322

DESC Ratepayer Case

Loss Contingencies [Line Items]

Litigation settlement, benefit fund

$ 520

SCANA

Loss Contingencies [Line Items]

Other expense

25

Other expense, after tax

25

Impairment of assets and other charges

44

100

44

Impairment of assets and other charges, after tax

33

75

33

Escrow account

$ 160

Litigation settlement expense

$ 32.5

$ 192.5

Litigation settlement paid

25

SCANA | DESC Ratepayer Case

Loss Contingencies [Line Items]

Escrow account

$ 2,000

Credit in future electric rate relief

2,000

Cash payment

$ 117

115

Proceeds from sale of property

38.5

Property, plant and equipment, net

$ 3

$ 27

3

3

SCANA | State Court Derivative Case

Loss Contingencies [Line Items]

Litigation settlement paid

$ 33

SCANA | Federal Court Merger Case

Loss Contingencies [Line Items]

Litigation settlement paid

63

SCANA | Other Current Liabilities

Loss Contingencies [Line Items]

Reserves for SCANA legal proceedings

208

196

196

208

SCANA | Other Receivables

Loss Contingencies [Line Items]

Insurance receivables

8

41

41

8

DESC

Loss Contingencies [Line Items]

Litigation settlement expense

$ 99

SCANA and DESC

Loss Contingencies [Line Items]

Disgorgement and prejudgment interest total, amount

112.5

Minimum | SCANA | DESC Ratepayer Case

Loss Contingencies [Line Items]

Proceeds from sale of property

60

Maximum | SCANA | Common Stock

Loss Contingencies [Line Items]

Litigation settlement amount through stock issuance

$ 32.5

Maximum | SCANA | DESC Ratepayer Case

Loss Contingencies [Line Items]

Proceeds from sale of property

$ 85

Virginia Electric and Power Company

Loss Contingencies [Line Items]

Impairment of assets and other charges

(230)

$ 200

(269)

$ 1,008

Property, plant and equipment, net

32,569

[2]

$ 33,876

$ 33,876

32,569

[2]

Virginia Electric and Power Company | EPA and State Regulatory Agencies

Loss Contingencies [Line Items]

Number of facilities to assess the applicability of section 316(b) | Facility

3

Hydroelectric Facilities | EPA and State Regulatory Agencies

Loss Contingencies [Line Items]

Number of facilities to assess the applicability of section 316(b) | Facility

8

Dominion Energy South Carolina Inc | NND Project

Loss Contingencies [Line Items]

Noncontrolling partnership interest

55.00%

55.00%

Contesting amount for filed liens in Fairfield country

$ 285

Dominion Energy South Carolina Inc | SCDOR

Loss Contingencies [Line Items]

Litigation settlement paid

$ 165

Proposed assessment amount from audit

$ 410

Proportional share of NND project

100.00%

Dominion Energy South Carolina Inc | SOUTH CAROLINA

Loss Contingencies [Line Items]

Amount claimed by plaintiffs in legal matter

$ 100

Percentage claimed by plaintiffs in legal matter

100.00%

Dominion Energy South Carolina Inc | DESC | Common Stock

Loss Contingencies [Line Items]

Litigation settlement through stock issuance | shares

1.4

Dominion Energy South Carolina Inc | DESC | Common Stock | SCDOR

Loss Contingencies [Line Items]

Initial litigation settlement through stock issuance | shares

0.6

Dominion Energy South Carolina Inc | Minimum | SCDOR

Loss Contingencies [Line Items]

Initial litigation settlement amount through stock issuance

$ 43

Unfavorable Regulatory Action | EPA

Loss Contingencies [Line Items]

Electric generating station facilities heightened entrainment analysis per day | gal

125,000,000

Carbon Regulations

Loss Contingencies [Line Items]

Public Utilities Significant Emission Rate Per Year CO2 Equivalent | T

75,000

CWA | Unfavorable Regulatory Action

Loss Contingencies [Line Items]

Number of mandatory facility-specific factors | Indicator

5

Number of optional facility-specific factors | Indicator

6

Number of facilities that are subject to final regulations | Facility

15

CWA | Unfavorable Regulatory Action | Minimum

Loss Contingencies [Line Items]

Electric generating stations with water withdrawals per day | gal

2,000,000

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

Loss Contingencies [Line Items]

Number of separate petitions for reconsideration granted | Petition

2

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

Loss Contingencies [Line Items]

Loss contingencies individual circumstances period

2021

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

Loss Contingencies [Line Items]

Loss contingencies individual circumstances period

2028

CWA | Unfavorable Regulatory Action | Virginia Electric and Power Company

Loss Contingencies [Line Items]

Number of facilities that are subject to final regulations | Facility

9

Waste Management and Remediation | Unfavorable Regulatory Action | EPA

Loss Contingencies [Line Items]

Number of sites remediation work substantially completed | site

12

Number of sites with remediation plans | site

3

Number of sites with an updated work plan | site

1

Updated work plan, cost increase

$ 11

Number of additional sites which are not under investigation | site

12

Waste Management and Remediation | Unfavorable Regulatory Action | EPA | Former Gas Plant Site With Post Closure Groundwater Monitoring Program

Loss Contingencies [Line Items]

Environmental remediation reserves

$ 40

42

Waste Management and Remediation | Unfavorable Regulatory Action | Virginia Electric and Power Company | EPA

Loss Contingencies [Line Items]

Number of sites with remediation plans | site

1

Number of additional sites which are not under investigation | site

2

Waste Management and Remediation | Unfavorable Regulatory Action | Virginia Electric and Power Company | EPA | Former Gas Plant Site With Post Closure Groundwater Monitoring Program

Loss Contingencies [Line Items]

Environmental remediation reserves

$ 25

$ 26

[1]

Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

[2]

Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Commitments and Contingencies_3

Commitments and Contingencies (Nuclear Insurance) (Narrative) (Detail) - USD ($)	1 Months Ended
	Jun. 30, 2021	May 31, 2021	Mar. 31, 2021	Feb. 28, 2021
Loss Contingencies [Line Items]
Maximum assessment for premiums on annual insurance policy	$ 76,000,000
Virginia Electric and Power Company
Loss Contingencies [Line Items]
Maximum assessment for premiums on annual insurance policy	35,000,000
Millstone
Loss Contingencies [Line Items]
Property insurance coverage		$ 1,700,000,000
NRC minimum requirement	1,060,000,000
North Anna
Loss Contingencies [Line Items]
Property insurance coverage		1,700,000,000
NRC minimum requirement	1,060,000,000
Surry
Loss Contingencies [Line Items]
Property insurance coverage		1,700,000,000
NRC minimum requirement	1,060,000,000
Nuclear Obligations | Secondary Financial Protection Program
Loss Contingencies [Line Items]
Maximum liability protection per nuclear incident amount	$ 13,500,000,000	$ 13,700,000,000	$ 13,700,000,000	$ 13,800,000,000

Commitments and Contingencies_4

Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)Guarantee
Guarantee Obligations [Line Items]
Guarantee liability	$ 3,851,000,000	[1]
Financial Guarantee | Equity Method Investee | Cove Point
Guarantee Obligations [Line Items]
Number of Guarantee | Guarantee	4
Guarantees with Maximum Limit [Member] | Equity Method Investee | Cove Point
Guarantee Obligations [Line Items]
Number of Guarantee | Guarantee	2
Guarantee liability	$ 1,900,000,000
Guarantees with No Maximum Limit [Member] | Equity Method Investee | Cove Point
Guarantee Obligations [Line Items]
Number of Guarantee | Guarantee	2
Guarantee liability	$ 0
Additional Guarantees [Member]
Guarantee Obligations [Line Items]
Guarantee liability	25,000,000
Surety Bond
Guarantee Obligations [Line Items]
Guarantee liability	169,000,000
Surety Bond | Virginia Electric and Power Company
Guarantee Obligations [Line Items]
Guarantee liability	95,000,000
Financial Standby Letter of Credit
Guarantee Obligations [Line Items]
Guarantee liability	$ 99,000,000
[1]	Excludes Dominion Energy's guarantees for the new corporate office property and an offshore wind installation vessel discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020.

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Subsidiary Guarantees (Detail)	Sep. 30, 2021USD ($)
Guarantee Obligations [Line Items]
Maximum Exposure	$ 3,851,000,000	[1]
Commodity Transactions
Guarantee Obligations [Line Items]
Maximum Exposure	1,892,000,000	[2]
Nuclear Obligations
Guarantee Obligations [Line Items]
Maximum Exposure	242,000,000	[3]
Solar
Guarantee Obligations [Line Items]
Maximum Exposure	463,000,000	[4]
Other
Guarantee Obligations [Line Items]
Maximum Exposure	$ 1,254,000,000	[5]
[1]	Excludes Dominion Energy's guarantees for the new corporate office property and an offshore wind installation vessel discussed in Note 15 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020.
[2]	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.
[3]	Guarantees primarily related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[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. Also includes guarantees entered into by Dominion Energy RNG Holdings II, Inc. on behalf of a subsidiary to facilitate construction of renewable natural gas facilities. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit.

Credit Risk (Narrative) (Detail

Credit Risk (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)counterparty	Dec. 31, 2020USD ($)
Concentration Risk and Guarantor Obligations [Line Items]
Credit exposure	$ 177,000,000
Additional collateral to be posted if the credit related contingent features were triggered	102,000,000	$ 14,000,000
Collateral derivatives with credit-related contingent provision in a liability position	90,000,000	1,000,000
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position	192,000,000	15,000,000
Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Credit exposure	10,000,000
Additional collateral to be posted if the credit related contingent features were triggered	40,000,000	2,000,000
Collateral derivatives with credit-related contingent provision in a liability position	79,000,000	0
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position	$ 119,000,000	$ 2,000,000
Credit Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty	0
Amount of exposure for single counterparty	$ 51,000,000
Credit Concentration Risk | Wholesale Customers | Sales Revenue, Net | Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty	0
Amount of exposure for single counterparty	$ 4,000,000
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	91.00%
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty | Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	80.00%

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Derivative Asset	$ 656,000,000		$ 656,000,000		$ 397,000,000
Derivative Liabilities	950,000,000		950,000,000		486,000,000
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Derivative Asset	359,000,000		359,000,000		181,000,000
Derivative Liabilities	453,000,000		453,000,000		405,000,000
Payable to affiliates	310,000,000		310,000,000		380,000,000	[1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries	$ 0		$ 0		0
Issuance of common stock to Dominion	0	0	0	0
Virginia Electric and Power Company | Pension Benefits | Amounts Associated With Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due to Dominion, noncurrent	$ 500,000,000		$ 500,000,000		436,000,000
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	412,000,000		412,000,000		354,000,000
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Derivative Asset	63,000,000		63,000,000		3,000,000
Derivative Liabilities	2,000,000		2,000,000		22,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements
Related Party Transaction [Line Items]
Payable to affiliates	$ 310,000,000		$ 310,000,000		$ 380,000,000
[1]	Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.

Related-Party Transactions (Det

Related-Party Transactions (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Commodity purchases from affiliates		$ 219	$ 135	$ 526	$ 450
Services provided by affiliates	[1]	116	108	363	343
Affiliated Entity
Related Party Transaction [Line Items]
Services provided to affiliates		$ 6	$ 5	$ 15	$ 14
[1]	Includes capitalized expenditures of $39 million for both the three months ended September 30, 2021 and 2020, and $121 million and $107 million for the nine months ended September 30, 2021 and 2020, respectively.

Related-Party Transactions (Par

Related-Party Transactions (Parenthetical) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Capital expenditures			$ 2,525	$ 2,301
Services provided by affiliates | Affiliated Entity
Related Party Transaction [Line Items]
Capital expenditures	$ 39	$ 39	$ 121	$ 107

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to qualified defined benefit pension plans and OPEB plans	$ 0		$ 0
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 6,000,000	$ 8,000,000	$ 18,000,000	$ 22,000,000
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
Discontinued Operations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 3,000,000		$ 12,000,000

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 43	$ 45	$ 127	$ 131
Interest cost		80	82	238	263
Expected return on plan assets		(209)	(197)	(625)	(582)
Amortization of prior service cost (credit)			(1)
Amortization of net actuarial loss		48	58	145	155
Settlements	[1]		3	5	5
Net periodic benefit credit		(38)	(10)	(110)	(28)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		6	8	18	22
Interest cost		11	15	35	45
Expected return on plan assets		(43)	(39)	(130)	(117)
Amortization of prior service cost (credit)		(11)	(12)	(32)	(37)
Amortization of net actuarial loss		1	1	3	4
Net periodic benefit credit		$ (36)	$ (27)	$ (106)	$ (83)
[1]	2021 amounts relate primarily to the Dominion Energy executive nonqualified pension plan. 2020 amounts related primarily to Dominion Energy’s sale of substantially all of its gas transmission and storage operations to BHE.

Operating Segments - Dominion E

Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Gain (loss) on investments	$ 370	$ 101
Operating Segments
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(617)	(1,300)
Operating Segments | Nuclear Decommissioning Trust Funds
Segment Reporting Information [Line Items]
Gain (loss) on investments	309
Gain (loss) on investments, after tax	248
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(642)	(3,600)
After- tax net benefits (expenses) for specific items	(492)	(3,400)
Contracted Assets | Operating Segments
Segment Reporting Information [Line Items]
Loss related to economic hedging activities	447
Loss related to economic hedging activities, after tax	336
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee	44
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee, after tax	35
Charge associated with certain nonregulated solar generation facilities		405
Charge associated with certain nonregulated solar generation facilities, after tax		298
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Funds
Segment Reporting Information [Line Items]
Gain (loss) on investments, after tax	218
Contracted Assets | Operating Segments | Fowler Ridge
Segment Reporting Information [Line Items]
Charge associated with the sale of assets		221
Charge associated with the sale of assets, after tax		171
Dominion Energy Virginia | Operating Segments
Segment Reporting Information [Line Items]
Benefit for change in expected CCRO reserve	130
Benefit for change in expected CCRO reserve, after tax	97
Charges associated with budget process related to customer arrears	77
Charges associated with budget process related to customer arrears, after tax	57
Charge associated with storm damage and service restoration	68
Charge associated with storm damage and service restoration, after tax	50
Loss from unbilled revenue reduction	151
Loss from unbilled revenue reduction, after tax	112
Net charge associated with proposed settlement of the 2021 Triennial Review	119
Net charge associated with proposed settlement of the 2021 Triennial Review, after tax	89
Charge for expected CCRO		200
Charge for expected CCRO, after tax		149
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds
Segment Reporting Information [Line Items]
Gain (loss) on investments, after tax	30
Dominion Energy Virginia | Operating Segments | Electric Generation Facilities
Segment Reporting Information [Line Items]
Asset early retirement expense		751
Asset early retirement expense after tax		$ 564
Dominion Energy South Carolina Inc | Operating Segments
Segment Reporting Information [Line Items]
Litigation settlement expense	70
Litigation settlement expense, after tax	53
Dominion Energy South Carolina Inc | Operating Segments | South Carolina Electric Base Rate Case
Segment Reporting Information [Line Items]
Charges associated with settlement	266
Charges associated with settlement, after tax	$ 199

Operating Segments (Schedule of

Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,176	$ 3,607	$ 10,084	$ 10,651
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests	[1],[2]	65	19	119	(1,753)
Net income (loss) attributable to Dominion Energy		654	356	1,947	(1,083)
Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		3,175	3,612	10,081	10,673
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue		18	9	46	36
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		0	0	0	0
Net income (loss) attributable to Dominion Energy		0	0	0	0
Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		1	(5)	3	(22)
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue		(236)	(252)	(737)	(763)
Eliminations
Segment Reporting Information [Line Items]
Operating Revenue		(218)	(243)	(691)	(727)
Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating Revenue		2,330	2,254	6,062	6,003
Dominion Energy Virginia | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		2,333	2,257	6,072	6,013
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		0	0	0	0
Net income (loss) attributable to Dominion Energy		599	613	1,464	1,479
Dominion Energy Virginia | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		(3)	(3)	(10)	(10)
Gas Distribution
Segment Reporting Information [Line Items]
Operating Revenue		373	314	1,804	1,606
Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		372	311	1,800	1,597
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		0	0	0	0
Net income (loss) attributable to Dominion Energy		69	64	415	375
Gas Distribution | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		1	3	4	9
Dominion Energy South Carolina
Segment Reporting Information [Line Items]
Operating Revenue		800	759	2,235	2,108
Dominion Energy South Carolina | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		799	758	2,230	2,105
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		0	0	0	0
Net income (loss) attributable to Dominion Energy		151	157	337	326
Dominion Energy South Carolina | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		1	1	5	3
Contracted Assets
Segment Reporting Information [Line Items]
Operating Revenue		282	301	845	846
Contracted Assets | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		265	288	790	810
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		0	51	0	153
Net income (loss) attributable to Dominion Energy		119	112	373	295
Contracted Assets | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		17	13	55	36
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue		(391)	222	(171)	815
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue		(612)	(11)	(857)	112
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interests		65	(32)	119	(1,906)
Net income (loss) attributable to Dominion Energy		(284)	(590)	(642)	(3,558)
Corporate and Other | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		$ 221	$ 233	$ 686	$ 703
[1]	Includes income tax expense (benefit) of $(6) million and $(10) million for the three months ended September 30, 2021 and 2020, respectively, and $5 million and $(572) million for the nine months ended September 30, 2021 and 2020, respectively.
[2]	See Note 10 for amounts attributable to related parties.

Operating Segments - Virginia P

Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Gain (loss) on investments	$ 370	$ 101
Operating Segments
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(617)	(1,300)
Operating Segments | Nuclear Decommissioning Trust Funds
Segment Reporting Information [Line Items]
Gain (loss) on investments	309
Gain (loss) on investments, after tax	248
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(642)	(3,600)
After- tax net benefits (expenses) for specific items	(492)	(3,400)
Operating Segments | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(118)
Asset early retirement expense		751
Asset early retirement expense after tax		559
Benefit for change in expected CCRO reserve	130
Benefit for change in expected CCRO reserve, after tax	97
Charges associated with budget process related to customer arrears	77
Charges associated with budget process related to customer arrears, after tax	57
Charge associated with storm damage and service restoration	68
Charge associated with storm damage and service restoration, after tax	50
Loss from unbilled revenue reduction	151
Loss from unbilled revenue reduction, after tax	112
Net charge associated with proposed settlement of the 2021 Triennial Review	119
Net charge associated with proposed settlement of the 2021 Triennial Review, after tax	89
Charge for expected CCRO		200
Charge for expected CCRO, after tax		149
Operating Segments | Virginia Electric and Power Company | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net benefits (expenses)	(118)	(792)
After- tax net benefits (expenses) for specific items	$ (186)	$ (815)

Operating Segments (Schedule _2

Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,176	$ 3,607	$ 10,084	$ 10,651
Net income (loss)		654	356	1,947	(1,083)
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	[1]	1,976	2,248	5,547	5,983
Net income (loss)		556	475	1,344	685
Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating Revenue		2,330	2,254	6,062	6,003
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		2,326	2,248	6,048	5,983
Net income (loss)		601	615	1,462	1,477
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue		(391)	222	(171)	815
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		(350)	0	(501)	0
Net income (loss)		$ (45)	$ (140)	$ (118)	$ (792)
[1]	See Note 19 for amounts attributable to affiliates.