Dominion Energy (D) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 13, 2018
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	D
Entity Registrant Name	DOMINION ENERGY INC /VA/
Entity Central Index Key	715,957
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		652,551,940
Virginia Electric and Power Company
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	VEL - PE
Entity Registrant Name	VIRGINIA ELECTRIC & POWER CO
Entity Central Index Key	103,682
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		274,723
Dominion Energy Gas Holdings, LLC
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Entity Registrant Name	Dominion Energy Gas Holdings, LLC
Entity Central Index Key	1,603,291
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Operating Revenue	[1]	$ 3,466	$ 3,384
Operating Expenses
Electric fuel and other energy-related purchases		744	575
Purchased (excess) electric capacity		14	(17)
Purchased gas		340	305
Other operations and maintenance		796	784
Depreciation, depletion and amortization		498	469
Other taxes		199	189
Total operating expenses		2,591	2,305
Income from operations		875	1,079
Other income		100	162
Interest and related charges		314	292
Income from operations including noncontrolling interests before income tax expense		661	949
Income tax expense		135	275
Net Income Including Noncontrolling Interests		526	674
Noncontrolling Interests		23	42
Net Income Attributable to Dominion Energy		$ 503	$ 632
Earnings Per Common Share
Net income attributable to Dominion Energy - Basic		$ 0.77	$ 1.01
Net income attributable to Dominion Energy - Diluted		0.77	1.01
Dividends Declared Per Common Share		$ 0.835	$ 0.755
Virginia Electric and Power Company
Operating Revenue	[2]	$ 1,748	$ 1,831
Operating Expenses
Electric fuel and other energy-related purchases	[2]	591	456
Purchased (excess) electric capacity		14	(17)
Affiliated suppliers		83	78
Other		316	296
Depreciation, depletion and amortization		297	286
Other taxes		83	79
Total operating expenses		1,384	1,178
Income from operations		364	653
Other income		3	31
Interest and related charges	[2]	132	120
Income from operations including noncontrolling interests before income tax expense		235	564
Income tax expense		51	208
Net Income Attributable to Dominion Energy		184	356
Dominion Energy Gas Holdings, LLC
Operating Revenue	[3]	526	490
Operating Expenses
Purchased gas	[3]	29	43
Other energy-related purchases		31	5
Affiliated suppliers		23	25
Other		123	153
Depreciation, depletion and amortization		59	54
Other taxes		60	54
Total operating expenses		325	334
Income from operations		201	156
Earnings from equity method investee		9	7
Other income		33	25
Interest and related charges	[3]	25	23
Income from operations including noncontrolling interests before income tax expense		218	165
Income tax expense		52	57
Net Income Attributable to Dominion Energy		$ 166	$ 108
[1]	See Note 10 for amounts attributable to related parties.
[2]	See Note 18 for amounts attributable to affiliates.
[3]	See Note 18 for amounts attributable to related parties.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income including noncontrolling interests		$ 526	$ 674
Net income		503	632
Other comprehensive income (loss), net of taxes:
Net deferred gains on derivatives-hedging activities, net of tax	[1]	111	43
Changes in unrealized net gains (losses) on investment securities, net of tax	[2]	(13)	58
Amounts reclassified to net income:
Net derivative (gains) losses-hedging activities, net of tax	[3]	8	(23)
Net realized (gains) losses on investment securities, net of tax	[4]	1	(28)
Net pension and other postretirement benefit costs, net of tax	[5]	25	13
Changes in other comprehensive income from equity method investees	[6]		1
Total other comprehensive income		132	64
Comprehensive income including noncontrolling interests		658	738
Comprehensive income attributable to noncontrolling interests		24	42
Comprehensive income attributable to Dominion Energy		634	696
Virginia Electric and Power Company
Net income		184	356
Other comprehensive income (loss), net of taxes:
Net deferred gains on derivatives-hedging activities, net of tax	[7]	5
Changes in unrealized net gains (losses) on investment securities, net of tax	[8]		7
Amounts reclassified to net income:
Net realized (gains) losses on investment securities, net of tax	[9]		(3)
Total other comprehensive income		5	4
Comprehensive income attributable to Dominion Energy		189	360
Dominion Energy Gas Holdings, LLC
Net income		166	108
Other comprehensive income (loss), net of taxes:
Net deferred gains on derivatives-hedging activities, net of tax	[10]	13	(9)
Amounts reclassified to net income:
Net derivative (gains) losses-hedging activities, net of tax	[11]	(3)	11
Net pension and other postretirement benefit costs, net of tax	[12]	1
Total other comprehensive income		11	2
Comprehensive income attributable to Dominion Energy		$ 177	$ 110
[1]	Net of $(37) million and $(27) million tax for the three months ended March 31, 2018 and 2017, respectively.
[2]	Net of $4 million and $(35) million tax for the three months ended March 31, 2018 and 2017, respectively.
[3]	Net of $(3) million and $14 million tax for the three months ended March 31, 2018 and 2017, respectively
[4]	Net of $— million and $16 million tax for the three months ended March 31, 2018 and 2017, respectively.
[5]	Net of $(1) million and $(8) million tax for the three months ended March 31, 2018 and 2017, respectively.
[6]	Net of $— million and $(1) million tax for the three months ended March 31, 2018 and 2017, respectively.
[7]	Net of $(2) million and $— million tax for the three months ended March 31, 2018 and 2017, respectively.
[8]	Net of $1 million and $(4) million tax for the three months ended March 31, 2018 and 2017, respectively.
[9]	Net of $— million and $2 million tax for the three months ended March 31, 2018 and 2017, respectively.
[10]	Net of $(4) million and $7 million tax for the three months ended March 31, 2018 and 2017, respectively.
[11]	Net of $1 million and $(7) million tax for the three months ended March 31, 2018 and 2017, respectively.
[12]	Net of $(1) million tax for both the three months ended March 31, 2018 and 2017.

Consolidated Statements of Com4

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net deferred gains on derivative-hedging activities, tax	$ (37)	$ (27)
Changes in unrealized net gains (losses) on investment securities, tax	4	(35)
Net derivative (gains) losses-hedging activities, tax	(3)	14
Net realized gains on investment securities, tax		16
Net pension and other postretirement benefit costs, tax	(1)	(8)
Changes in other comprehensive income (loss) from equity method investees, tax		(1)
Virginia Electric and Power Company
Net deferred gains on derivative-hedging activities, tax	(2)
Changes in unrealized net gains (losses) on investment securities, tax	1	(4)
Net realized gains on investment securities, tax		2
Dominion Energy Gas Holdings, LLC
Net deferred gains on derivative-hedging activities, tax	(4)	7
Net derivative (gains) losses-hedging activities, tax	1	(7)
Net pension and other postretirement benefit costs, tax	$ (1)	$ (1)

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents		$ 189	$ 120	[1]
Customer receivables (less allowance for doubtful accounts)		1,615	1,660	[1]
Other receivables (less allowance for doubtful accounts)	[2]	136	126	[1]
Inventories		1,367	1,477	[1]
Other		974	951	[1]
Total current assets		4,281	4,334	[1]
Investments
Nuclear decommissioning trust funds		5,060	5,093	[1]
Investment in equity method affiliates		1,638	1,544	[1]
Other		334	327	[1]
Total investments		7,032	6,964	[1]
Property, Plant and Equipment
Property, plant and equipment		75,632	74,823	[1]
Accumulated depreciation, depletion and amortization		(21,503)	(21,065)	[1]
Total property, plant and equipment, net		54,129	53,758	[1]
Deferred Charges and Other Assets
Goodwill		6,405	6,405	[1]
Regulatory assets		2,698	2,480	[1]
Other		2,809	2,644	[1]
Total deferred charges and other assets		11,912	11,529	[1]
Total assets		77,354	76,585	[1]
Current Liabilities
Securities due within one year		3,603	3,078	[1]
Short-term debt		2,713	3,298	[1]
Accounts payable		702	875	[1]
Regulatory liabilities	[3]	408	193
Other	[2]	2,321	2,385	[1]
Total current liabilities		9,339	9,636	[1]
Long-Term Debt
Long-term debt		25,759	25,588	[1]
Junior subordinated notes		3,980	3,981	[1]
Remarketable subordinated notes		1,381	1,379	[1]
Total long-term debt		31,120	30,948	[1]
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		4,719	4,523	[1]
Regulatory liabilities		6,977	6,916	[1]
Other	[2]	5,157	5,192	[1]
Total deferred credits and other liabilities		16,853	16,631	[1]
Total liabilities		57,312	57,215	[1]
Commitments and Contingencies				[1]
Equity
Common stock – no par	[4]	10,316	9,865	[1]
Retained earnings		8,924	7,936	[1]
Accumulated other comprehensive loss		(1,551)	(659)	[1]
Total common shareholders' equity		17,689	17,142	[1]
Noncontrolling interests		2,353	2,228	[1]
Total equity		20,042	19,370	[1]
Total liabilities and equity		77,354	76,585	[1]
Virginia Electric and Power Company
Current Assets
Cash and cash equivalents		6	14	[5]
Customer receivables (less allowance for doubtful accounts)		885	951	[5]
Other receivables (less allowance for doubtful accounts)		52	64	[5]
Affiliated receivables		51	3	[5]
Inventories		795	850	[5]
Prepayments		38	27	[5]
Other	[6]	358	315	[5]
Total current assets		2,185	2,224	[5]
Investments
Nuclear decommissioning trust funds		2,400	2,399	[5]
Other		3	3	[5]
Total investments		2,403	2,402	[5]
Property, Plant and Equipment
Property, plant and equipment		42,827	42,329	[5]
Accumulated depreciation, depletion and amortization		(13,522)	(13,277)	[5]
Total property, plant and equipment, net		29,305	29,052	[5]
Deferred Charges and Other Assets
Regulatory assets		1,009	810	[5]
Other	[6]	719	651	[5]
Total deferred charges and other assets		1,728	1,461	[5]
Total assets		35,621	35,139	[5]
Current Liabilities
Securities due within one year		600	850	[5]
Short-term debt		426	542	[5]
Accounts payable		308	361	[5]
Payables to affiliates		113	125	[5]
Affiliated current borrowings		11	33	[5]
Accrued interest, payroll and taxes		251	256	[5]
Regulatory liabilities		304	127	[5]
Other	[6]	597	626	[5]
Total current liabilities		2,610	2,920	[5]
Long-Term Debt
Total long-term debt		11,090	10,496	[5]
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		2,827	2,728	[5]
Asset retirement obligations		1,165	1,149	[5]
Regulatory liabilities		4,796	4,760	[5]
Other	[6]	871	862	[5]
Total deferred credits and other liabilities		9,659	9,499	[5]
Total liabilities		23,359	22,915	[5]
Commitments and Contingencies				[5]
Equity
Common stock – no par	[7]	5,738	5,738	[5]
Other paid-in capital		1,113	1,113	[5]
Retained earnings		5,420	5,311	[5]
Accumulated other comprehensive loss		(9)	62	[5]
Total common shareholders' equity		12,262	12,224	[5]
Total liabilities and equity		35,621	35,139	[5]
Dominion Energy Gas Holdings, LLC
Current Assets
Cash and cash equivalents		6	4	[8]
Customer receivables (less allowance for doubtful accounts)	[9]	318	297	[8]
Other receivables (less allowance for doubtful accounts)	[9]	22	15	[8]
Affiliated receivables		7	10	[8]
Inventories		71	64	[8]
Other	[9]	189	210	[8]
Total current assets		613	600	[8]
Investments
Total investments		99	97	[8]
Property, Plant and Equipment
Property, plant and equipment		11,274	11,173	[8]
Accumulated depreciation, depletion and amortization		(3,068)	(3,018)	[8]
Total property, plant and equipment, net		8,206	8,155	[8]
Deferred Charges and Other Assets
Pension and other postretirement benefit assets	[9]	1,867	1,828	[8]
Regulatory assets	[10]	540	511
Other	[9]	1,303	1,260	[8]
Total deferred charges and other assets		3,170	3,088	[8]
Total assets		12,088	11,940	[8]
Current Liabilities
Short-term debt		614	629	[8]
Accounts payable		145	193	[8]
Payables to affiliates		87	62	[8]
Affiliated current borrowings		41	18	[8]
Regulatory liabilities	[3]	42	38
Other	[9]	388	439	[8]
Total current liabilities		1,275	1,341	[8]
Long-Term Debt
Total long-term debt		3,579	3,570	[8]
Deferred Credits and Other Liabilities
Deferred income taxes and investment tax credits		1,475	1,454	[8]
Regulatory liabilities	[11]	1,243	1,227
Other	[9]	1,429	1,412	[8]
Total deferred credits and other liabilities		2,904	2,866	[8]
Total liabilities		7,758	7,777	[8]
Commitments and Contingencies				[8]
Equity
Membership interests		4,443	4,261	[8]
Accumulated other comprehensive loss		(113)	(98)	[8]
Total equity		4,330	4,163	[8]
Total liabilities and equity		$ 12,088	$ 11,940	[8]
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	See Note 10 for amounts attributable to related parties.
[3]	Current regulatory liabilities are presented in other current liabilities in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets.
[4]	1 billion shares authorized; 653 million shares and 645 million shares outstanding at March 31, 2018 and December 31, 2017, respectively.
[5]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[6]	See Note 18 for amounts attributable to affiliates.
[7]	500,000 shares authorized; 274,723 shares outstanding at March 31, 2018 and December 31, 2017.
[8]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[9]	See Note 18 for amounts attributable to related parties.
[10]	Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.
[11]	Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.

Consolidated Balance Sheets (U6

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Customer receivables, allowance for doubtful accounts		$ 19	$ 17
Other receivables, allowance for doubtful accounts	[1]	$ 2	$ 2
Common stock, shares authorized		1,000,000,000	1,000,000,000
Common stock, shares outstanding		653,000,000	645,000,000
Virginia Electric and Power Company
Customer receivables, allowance for doubtful accounts		$ 10	$ 10	[2]
Other receivables, allowance for doubtful accounts		$ 1	$ 1	[2]
Common stock, shares authorized		500,000	500,000	[2]
Common stock, shares outstanding		274,723	274,723	[2]
Dominion Energy Gas Holdings, LLC
Customer receivables, allowance for doubtful accounts	[3]	$ 1	$ 1	[4]
Other receivables, allowance for doubtful accounts	[3]	$ 1	$ 1	[4]
[1]	See Note 10 for amounts attributable to related parties.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	See Note 18 for amounts attributable to related parties.
[4]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 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		Virginia Electric and Power Company		Dominion Energy Gas Holdings, LLC		Common Stock	Common StockVirginia Electric and Power Company	Retained Earnings	Retained EarningsVirginia Electric and Power Company	AOCI	AOCIVirginia Electric and Power Company	AOCIDominion Energy Gas Holdings, LLC	Total Common Shareholders' Equity	Noncontrolling Interests	Other Paid-In CapitalVirginia Electric and Power Company	Member UnitsDominion Energy Gas Holdings, LLC
Beginning balance at Dec. 31, 2016	$ 16,840						$ 8,550		$ 6,854		$ (799)			$ 14,605	$ 2,235
Beginning balance (in shares) at Dec. 31, 2016							628,000,000
Cumulative-effect of changes in accounting principles													$ 0
Net income including noncontrolling interests	674								632					632	42
Contributions from NRG to Four Brothers and Three Cedars	6														6
Issuance of common stock	79						$ 79							79
Issuance of common stock (in shares)			0				1,000,000
Dividends and distributions	(493)								(474)					(474)	(19)
Other comprehensive income, net of tax	64		$ 4		$ 2						64			64
Other	11								11					11
Ending balance at Mar. 31, 2017	17,181						$ 8,629		7,023		(735)			14,917	2,264
Ending balance (in shares) at Mar. 31, 2017							629,000,000
Beginning balance at Dec. 31, 2016											(799)	$ 46	(123)
Ending balance at Mar. 31, 2017											(735)	50	(121)
Beginning balance at Dec. 31, 2017	19,370	[1]			4,163	[2]	$ 9,865		7,936		(659)		(98)	17,142	2,228		$ 4,261
Beginning balance (in shares) at Dec. 31, 2017							645,000,000	275,000
Cumulative-effect of changes in accounting principles	6		3		3		$ (127)		1,029	$ 79	(1,023)	(76)	(26)	(121)	127		29
Net income including noncontrolling interests	526		$ 184		166				503	184				503	23		166
Issuance of common stock	580						$ 580							580
Issuance of common stock (in shares)			0				8,000,000
Noncontrolling Interest Increase From Sale Of Parent Equity Interest	4														4
Stock awards (net of change in unearned compensation)	3						$ 3							3
Dividends and distributions	(575)		$ (154)						(544)	(154)				(544)	(31)
Distribution					(13)												(13)
Other comprehensive income, net of tax	132		5		11						131	5	11	131	1
Other	(4)						(5)							(5)	1
Ending balance at Mar. 31, 2018	20,042				$ 4,330		$ 10,316		$ 8,924		(1,551)		(113)	$ 17,689	$ 2,353		$ 4,443
Ending balance (in shares) at Mar. 31, 2018							653,000,000	275,000
Beginning balance at Dec. 31, 2017	17,142	[1]	12,224	[3]				$ 5,738		5,311	(659)	62	(98)			$ 1,113
Ending balance at Mar. 31, 2018	$ 17,689		$ 12,262					$ 5,738		$ 5,420	$ (1,551)	$ (9)	$ (113)			$ 1,113
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income including noncontrolling interests	$ 526	$ 674
Net income	503	632
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	572	548
Deferred income taxes and investment tax credits	131	250
Proceeds from assignment of tower rental portfolio		91
Contribution to pension plan		(75)
Gains on sales of assets	(44)
Provision for rate credits to electric utility customers	215
Other adjustments	13	(84)
Changes in:
Accounts receivable	47	136
Inventories	104	61
Increase Decrease In Deferred Fuel Costs	(264)	(37)
Prepayments	(3)	18
Accounts payable	(57)	(140)
Accrued interest, payroll and taxes	(103)	(19)
Customer deposits	101
Margin deposit assets and liabilities	(33)	8
Net realized and unrealized changes related to derivative activities	47	31
Other operating assets and liabilities	(20)	(102)
Net cash provided by operating activities	1,232	1,360
Investing Activities
Plant construction and other property additions (including nuclear fuel)	(1,103)	(1,435)
Proceeds from assignments of shale development rights	44
Acquisition of solar development projects	(7)	(94)
Proceeds from sales of securities	419	756
Purchases of securities	(453)	(786)
Contributions to equity method affiliates	(87)	(146)
Other	4	4
Net cash used in investing activities	(1,183)	(1,701)
Financing Activities
Issuance of short-term notes	950
Issuance (repayment) of short-term debt, net	(585)	(528)
Issuance of long-term debt	950	1,950
Repayment of long-term debt	(1,180)	(401)
Issuance of common stock	581	79
Common dividend payments	(544)	(474)
Other	(72)	(67)
Net cash provided by (used in) financing activities	100	559
Increase(Decrease) in cash, restricted cash and equivalents	149	218
Cash, restricted cash and equivalents at beginning of period	185	322
Cash, restricted cash and equivalents at end of period	334	540
Significant noncash investing activities:
Accrued capital expenditures	175	230
Virginia Electric and Power Company
Operating Activities
Net income	184	356
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	343	336
Deferred income taxes and investment tax credits	83	56
Proceeds from assignment of tower rental portfolio		91
Provision for rate credits to customers	215
Other adjustments	(1)	(26)
Changes in:
Accounts receivable	78	76
Affiliated receivables and payables	(59)	141
Inventories	54	11
Increase Decrease In Deferred Fuel Costs	(328)	(49)
Prepayments	(11)	(12)
Accounts payable	3	(21)
Accrued interest, payroll and taxes	(5)	9
Net realized and unrealized changes related to derivative activities	49	15
Asset retirement obligations	(10)	(22)
Other operating assets and liabilities	(16)	7
Net cash provided by operating activities	579	968
Investing Activities
Plant construction and other property additions (including nuclear fuel)	(570)	(647)
Purchases of nuclear fuel	(46)	(40)
Proceeds from sales of securities	218	330
Purchases of securities	(235)	(342)
Other	(6)	(3)
Net cash used in investing activities	(639)	(702)
Financing Activities
Issuance (repayment) of short-term debt, net	(116)	(25)
Issuance of long-term debt	700	750
Repayment of affiliated current borrowings, net	(22)	(262)
Repayment of long-term debt	(350)
Common dividend payments	(154)	(445)
Other	(6)	(6)
Net cash provided by (used in) financing activities	52	12
Increase(Decrease) in cash, restricted cash and equivalents	(8)	278
Cash, restricted cash and equivalents at beginning of period	24	11
Cash, restricted cash and equivalents at end of period	16	289
Significant noncash investing activities:
Accrued capital expenditures	104	124
Dominion Energy Gas Holdings, LLC
Operating Activities
Net income	166	108
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	59	54
Deferred income taxes and investment tax credits	14	59
Gains on sales of assets	(44)
Other adjustments	(4)	(4)
Changes in:
Accounts receivable	(28)	3
Affiliated receivables and payables	28	1
Inventories	(7)	(6)
Increase Decrease In Deferred Fuel Costs	8	11
Prepayments	16	12
Accounts payable	(39)	(53)
Accrued interest, payroll and taxes	(30)	(9)
Other operating assets and liabilities	(1)	(3)
Asset retirement obligations	(36)	(31)
Net cash provided by operating activities	102	142
Investing Activities
Plant construction and other property additions (including nuclear fuel)	(138)	(134)
Proceeds from assignments of shale development rights	44
Other	(5)	(8)
Net cash used in investing activities	(99)	(142)
Financing Activities
Issuance (repayment) of short-term debt, net	(15)	(61)
Repayment of affiliated current borrowings, net	23	56
Distribution payments to parent	(13)	(7)
Other	1
Net cash provided by (used in) financing activities	(4)	(12)
Increase(Decrease) in cash, restricted cash and equivalents	(1)	(12)
Cash, restricted cash and equivalents at beginning of period	30	43
Cash, restricted cash and equivalents at end of period	29	31
Significant noncash investing activities:
Accrued capital expenditures	$ 29	$ 31

Nature of Operations

Nature of Operations	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	Note 1. Nature of Operations Dominion Energy, headquartered in Richmond, Virginia, is one of the nation’s largest producers and transporters of energy. Dominion Energy’s operations are conducted through various subsidiaries, including Virginia Power and Dominion Energy Gas. Virginia Power is a regulated public utility that generates, transmits and distributes electricity for sale in Virginia and northeastern North Carolina. Dominion Energy Gas is a holding company that conducts business activities through a regulated interstate natural gas transmission pipeline and underground storage system in the Northeast, mid-Atlantic and Midwest states, regulated gas transportation and distribution operations in Ohio, and gas gathering and processing activities primarily in West Virginia, Ohio and Pennsylvania. In addition, other Dominion Energy subsidiaries provide merchant generation, natural gas transmission and distribution services primarily in the eastern and Rocky Mountain regions of the U.S.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
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, 2017. In the Companies' opinion, the accompanying unaudited Consolidated Financial Statements contain all adjustments necessary to present fairly their financial position as of March 31, 2018, their results of operations and cash flows for the three months ended March 31, 2018 and 2017, Dominion Energy's changes in equity for the three months ended March 31, 2018 and 2017 and Virginia Power and Dominion Energy Gas’ changes in equity for the three months ended March 31, 2018. 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 March 31, 2018, Dominion Energy owns the general partner, 50.5% of the common and subordinated units and 37.5% of the convertible preferred interests in Dominion Energy Midstream. The public’s ownership interest in Dominion Energy Midstream is reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements. Also, at March 31, 2018, Dominion Energy owns 50% of the units in and consolidates Four Brothers and Three Cedars. NRG's ownership interest in Four Brothers and Three Cedars, as well as Terra Nova Renewable Partners' 33% interest in certain Dominion Energy merchant solar projects, is reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements. Terra Nova Renewable Partners has a future option to buy all or a portion of Dominion Energy’s remaining 67% ownership in the projects upon the occurrence of certain events, none of which had occurred at March 31, 2018 nor are expected to occur in the remainder of 2018. 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' 2017 Consolidated Financial Statements and Notes have been reclassified as a result of the adoption of revised accounting guidance pertaining to certain net periodic pension and other postretirement benefit costs, restricted cash and equivalents and certain distributions from equity method investees. In addition, certain other amounts have been reclassified to conform to the 2018 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows. Amounts disclosed for Dominion Energy are inclusive of Virginia Power and/or Dominion Energy Gas, where applicable. The effects of the adoption of new accounting standards on the Consolidated Financial Statements are described below. There have been no other 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, 2017. Operating Revenue Operating revenue is recorded on the basis of services rendered, commodities delivered or contracts settled and includes amounts yet to be billed to customers. Dominion Energy and Virginia Power collect sales, consumption and consumer utility taxes and Dominion Energy Gas collects sales taxes; however, these amounts are excluded from revenue. Dominion Energy’s customer receivables include accrued unbilled revenue based on estimated amounts of electricity and natural gas delivered but not yet billed to utility customers. Virginia Power’s customer receivables include accrued unbilled revenue based on estimated amounts of electricity delivered but not yet billed to customers. Dominion Energy Gas’ customer receivables include accrued unbilled revenue based on estimated amounts of natural gas delivered but not yet billed to customers. The primary types of sales and service activities reported as operating revenue for Dominion Energy, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales consist primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Nonregulated electric sales consist primarily of sales of electricity at market-based rates and contracted fixed rates, and associated hedging activity; • Regulated gas sales consist primarily of state-regulated natural gas sales and related distribution services; • Nonregulated gas sales consist primarily of sales of natural gas production at market-based rates and contracted fixed prices, sales of gas purchased from third parties and associated hedging activity; • Regulated gas transportation and storage sales consist of FERC-regulated sales of transmission and storage services and state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • Nonregulated gas transportation and storage sales consist primarily of LNG terminalling services, beginning in April 2018; • Other regulated revenue consists primarily of miscellaneous service revenue from electric and gas distribution operations and sales of excess electric capacity and other commodities; and • Other nonregulated revenue consists primarily of NGL gathering and processing, sales of NGL production and condensate, extracted products and associated hedging activity. Other nonregulated revenue also includes services performed for Atlantic Coast Pipeline, sales of energy-related products and services from Dominion Energy’s retail energy marketing operations, service concession arrangements and gas processing and handling revenue. Other Revenue • Other revenue consists primarily of alternative revenue programs, gains and losses from derivative instruments not subject to hedge accounting and lease revenues. The primary types of sales and service activities reported as operating revenue for Dominion Energy, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales consisted primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Nonregulated electric sales consisted primarily of sales of electricity at market-based rates and contracted fixed rates, and associated derivative activity; • Regulated gas sales consisted primarily of state- and FERC-regulated natural gas sales and related distribution services and associated derivative activity; • Nonregulated gas sales consisted primarily of sales of natural gas production at market-based rates and contracted fixed prices, sales of gas purchased from third parties, gas trading and marketing revenue and associated derivative activity; • Gas transportation and storage sales consisted primarily of FERC-regulated sales of transmission and storage services. Also included were state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; and • Other revenue consisted primarily of sales of NGL production and condensate, extracted products and associated derivative activity. Other revenue also included miscellaneous service revenue from electric and gas distribution operations, sales of energy-related products and services from Dominion Energy’s retail energy marketing operations and gas processing and handling revenue. The primary types of sales and service activities reported as operating revenue for Virginia Power, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales consist primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Other regulated revenue consists primarily of sales of excess capacity and other commodities and miscellaneous service revenue from electric distribution operations; and • Other nonregulated revenue consists primarily of sales to non-jurisdictional customers from certain solar facilities, revenue from renting space on certain electric transmission poles and distribution towers and service concession arrangements. Other Revenue • Other revenue consists primarily of alternative revenue programs and gains and losses from derivative instruments not subject to hedge accounting. The primary types of sales and service activities reported as operating revenue for Virginia Power, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales consisted primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; and • Other revenue consisted primarily of miscellaneous service revenue from electric distribution operations and miscellaneous revenue from generation operations, including sales of capacity and other commodities. The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated gas sales consist primarily of state-regulated natural gas sales and related distribution services; • Nonregulated gas sales consist primarily of sales of gas purchased from third parties and royalty revenues; • Regulated gas transportation and storage sales consist of FERC-regulated sales of transmission and storage services and state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • NGL revenue consists primarily of NGL gathering and processing, sales of NGL production and condensate, extracted products and associated hedging activity; • Management service revenue consists primarily of services performed for Atlantic Coast Pipeline; • Other regulated revenue consists primarily of miscellaneous regulated revenues; and • Other nonregulated revenue consists primarily of miscellaneous service revenue. Other Revenue • Other revenue consists primarily of gains and losses from derivative instruments not subject to hedge accounting. The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated gas sales consisted primarily of state- and FERC-regulated natural gas sales and related distribution services; • Nonregulated gas sales consisted primarily of sales of natural gas production at market-based rates and contracted fixed prices and sales of gas purchased from third parties. Revenue from sales of gas production was recognized based on actual volumes of gas sold to purchasers and was reported net of royalties; • Gas transportation and storage sales consisted primarily of FERC-regulated sales of transmission and storage services. Also included were state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • NGL revenue consisted primarily of sales of NGL production and condensate, extracted products and associated derivative activity; and • Other revenue consisted primarily of miscellaneous service revenue, gas processing and handling revenue. Alternative revenue programs compensate Dominion Energy and Virginia Power for certain projects and initiatives. Revenues arising from these programs are presented separately from revenue arising from contracts with customers in the categories above. Currently, Dominion Energy and Virginia Power account for the equity return for under-recovery of certain riders under the alternative revenue program guidance. Revenues from electric and gas sales are recognized over time, as the customers of the Companies consume the gas and electricity as it is delivered. Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. LNG terminalling services, beginning in April 2018, are also stand-ready service contracts with fixed fees. Fixed fees are recognized ratably over the life of the contract as the stand-ready performance obligation is satisfied, while variable usage fees are recognized when Dominion Energy and Dominion Energy Gas have a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the performance obligation completed to date. Sales of products, such as NGLs, typically transfer control and are recognized as revenue upon delivery of the product. The customer is able to direct the use of, and obtain substantially all of the benefits from, the product at the time the product is delivered. The contract with the customer states the final terms of the sale, including the description, quantity and price of each product or service purchased. Payment for most sales and services varies by contract type, but is typically due within a month of billing. Dominion Energy and Dominion Energy Gas typically receive or retain NGLs and natural gas from customers when providing natural gas processing, transportation or storage services. The revised guidance for revenue from contracts with customers requires entities to include the fair value of the noncash consideration in the transaction price. Therefore, subsequent to the adoption of the revised guidance for revenue recognition from contracts with customers, Dominion Energy and Dominion Energy Gas record the fair value of NGLs received during natural gas processing as service revenue recognized over time, and continue to recognize revenue from the subsequent sale of the NGLs to customers upon delivery. Dominion Energy and Dominion Energy Gas typically retain natural gas under certain transportation service arrangements that are intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the allowance is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue. Cash, Restricted Cash and Equivalents Restricted Cash and Equivalents The Companies hold restricted cash and equivalent balances that primarily consist of amounts held for certain customer deposits, future debt payments on SBL Holdco and Dominion Solar Projects III, Inc.’s term loan agreements and a distribution reserve at Cove Point. Upon adoption of revised accounting guidance in January 2018, restricted cash and equivalents are included within the Companies’ Consolidated Statements of Cash Flows, with the change in balance no longer considered a separate investing activity. The guidance required retrospective application which resulted in an adjustment to Dominion Energy’s other cash provided by investing activities for the three months ended March 31, 2017, which had been previously reported as $11 million. There was no impact to Virginia Power or Dominion Energy Gas for the three months ended March 31, 2017. 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 three months ended March 31, 2018 and 2017: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period March 31, 2018 March 31, 2017 December 31, 2017 December 31, 2016 (millions) Dominion Energy Cash and cash equivalents $ 189 $ 486 $ 120 $ 261 Restricted cash and equivalents (1) 145 54 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 334 $ 540 $ 185 $ 322 Virginia Power Cash and cash equivalents $ 6 $ 289 $ 14 $ 11 Restricted cash and equivalents (1) 10 — 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 16 $ 289 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents $ 6 $ 11 $ 4 $ 23 Restricted cash and equivalents (1) 23 20 26 20 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 29 $ 31 $ 30 $ 43 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets. Distributions from Equity Method Investees Dominion Energy and Dominion Energy Gas each hold investments that are accounted for under the equity method of accounting. Effective January 2018, Dominion Energy and Dominion Energy Gas classify distributions from equity method investees as either cash flows from operating activities or cash flows from investing activities in the Consolidated Statements of Cash Flows according to the nature of the distribution. Distributions received are classified on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment (classified as cash flows from operating activities) or a return of an investment (classified as cash flows from investing activities) when such information is available to Dominion Energy and Dominion Energy Gas. Previously, distributions were determined to be either a return on an investment or return of an investment based on a cumulative earnings approach whereby any distributions received in excess of earnings were considered to be a return of an investment. Dominion Energy and Dominion Energy Gas have applied this approach on a retrospective basis with no impact to the three months ended March 31, 2017. Investments Debt and Equity Securities with Readily Determinable Fair Values Dominion Energy accounts for and classifies investments in debt securities as trading or available-for-sale securities. Virginia Power classifies investments in debt securities as available-for-sale securities. • Debt securities classified as trading securities include securities held by Dominion Energy in rabbi trusts associated with certain deferred compensation plans. These securities are reported in other investments in the Consolidated Balance Sheets at fair value with net realized and unrealized gains and losses included in other income in the Consolidated Statements of Income. • Debt securities classified as available-for-sale securities include all other debt securities, primarily comprised of securities held in the nuclear decommissioning trusts. These investments are reported at fair value in nuclear decommissioning trust funds in the Consolidated Balance Sheets. Net realized and unrealized gains and losses (including any other-than-temporary impairments) on investments held in Virginia Power’s nuclear decommissioning trusts are recorded to a regulatory liability for certain jurisdictions subject to cost-based regulation. For all other available-for-sale debt securities, including those held in Dominion Energy’s merchant generation nuclear decommissioning trusts, net realized gains and losses (including any other-than-temporary impairments) are included in other income and unrealized gains and losses are reported as a component of AOCI, after-tax. In determining realized gains and losses for debt securities, the cost basis of the security is based on the specific identification method. Equity securities with readily determinable fair values include securities held by Dominion Energy in rabbi trusts associated with certain deferred compensation plans and securities held by Dominion Energy and Virginia Power in the nuclear decommissioning trusts. Dominion Energy and Virginia Power record all equity securities with a readily determinable fair value, or for which they are permitted to estimate fair value using NAV (or its equivalent), at fair value in nuclear decommissioning trust funds and other investments in the Consolidated Balance Sheets. However, Dominion Energy and Virginia Power may elect a measurement alternative for equity securities without a readily determinable fair value. Under the measurement alternative, equity securities are reported at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Dominion Energy and Virginia Power qualitatively assess equity securities reported using the measurement alternative to determine whether an investment is impaired on an ongoing basis. Net realized and unrealized gains and losses on equity securities held in Virginia Power’s nuclear decommissioning trusts are recorded to a regulatory liability for certain jurisdictions subject to cost-based regulation. For all other equity securities, including those held in Dominion Energy’s merchant generation nuclear decommissioning trusts and rabbi trusts, net realized and unrealized gains and losses are included in other income in the Consolidated Statements of Income. Equity Securities without Readily Determinable Fair Values The Companies account for illiquid and privately held securities without readily determinable fair values under either the equity method or cost method. Equity securities without readily determinable fair values include: • Equity method investments when the Companies have the ability to exercise significant influence, but not control, over the investee. Dominion Energy’s investments are included in investments in equity method affiliates and Dominion Energy Gas’ investments are included in investments in their Consolidated Balance Sheets. Dominion Energy and Dominion Energy Gas record equity method adjustments in other income and earnings from equity method investee, respectively, in their Consolidated Statements of Income, including their proportionate share of investee income or loss, gains or losses resulting from investee capital transactions, amortization of certain differences between the carrying value and the equity in the net assets of the investee at the date of investment and other adjustments required by the equity method. • Cost method investments when Dominion Energy and Virginia Power do not have the ability to exercise significant influence over the investee. Dominion Energy’s and Virginia Power’s investments are included in other investments and nuclear decommissioning trust funds. Cost method investments are reported at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer. Other-Than-Temporary Impairment The Companies periodically review their investments in debt securities and equity method investments to determine whether a decline in fair value should be considered other-than-temporary. If a decline in the fair value of any security is determined to be other-than-temporary, the security is written down to its fair value at the end of the reporting period. Decommissioning Trust Investments – Special Considerations • The recognition provisions of other-than-temporary impairment guidance apply only to debt securities classified as available-for-sale or held-to-maturity. • Debt securities – Using information obtained from their nuclear decommissioning trust fixed-income investment managers, Dominion Energy and Virginia Power record in earnings any unrealized loss for a debt security when the manager intends to sell the debt security or it is more-likely-than-not that the manager will have to sell the debt security before recovery of its fair value up to its cost basis. If that is not the case, but the debt security is deemed to have experienced a credit loss, Dominion Energy and Virginia Power record the credit loss in earnings and any remaining portion of the unrealized loss in AOCI. Credit losses are evaluated primarily by considering the credit ratings of the issuer, prior instances of non-performance by the issuer and other factors. New Accounting Standards Revenue Recognition In May 2014, the FASB issued revised accounting guidance for revenue recognition from contracts with customers. The Companies adopted this revised accounting guidance for interim and annual reporting periods beginning January 1, 2018 using the modified retrospective method. Upon the adoption of the standard, Dominion Energy and Dominion Energy Gas recorded the cumulative-effect of a change in accounting principle of $3 million to retained earnings and membership interests, respectively, and to establish a contract asset related to changes in the timing of revenue recognition for three existing contracts with customers at DETI. As a result of adopting this revised accounting guidance, Dominion Energy and Dominion Energy Gas recorded offsetting operating revenue and other energy-related purchases of $25 million in the Consolidated Statements of Income for non-cash consideration for performing processing and fractionation services related to NGLs for the three months ended March 31, 2018. No such amounts were recorded during the three months ended March 31, 2017. Dominion Energy and Dominion Energy Gas no longer record offsetting operating revenue and purchased gas for fuel retained to offset costs on certain transportation and storage arrangements. Such amounts at Dominion Energy and Dominion Energy Gas were $32 million and $24 million, respectively, recorded in the Consolidated Statements of Income for the three months ended March 31, 2017. Financial Instruments In January 2016, the FASB issued revised accounting guidance for the recognition, measurement, presentation and disclosure of financial instruments. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018 and the Companies adopted the standard using the modified retrospective method. Upon adoption of this guidance for equity securities held at January 1, 2018, Dominion Energy and Virginia Power recorded the cumulative-effect of a change in accounting principle to reclassify net unrealized gains from AOCI to retained earnings and to recognize equity securities previously categorized as cost method investments at fair value (using NAV) in nuclear decommissioning trust funds in the Consolidated Balance Sheets and a cumulative-effect adjustment to retained earnings. Dominion Energy and Virginia Power reclassified approximately $1.1 billion ($734 million after-tax) and $119 million ($73 million after-tax), respectively, of net unrealized gains from AOCI to retained earnings. Dominion Energy and Virginia Power also recorded approximately $36 million ($22 million after-tax) in net unrealized gains on equity securities previously classified as cost method investments, of which $3 million was recorded to retained earnings and $33 million was recorded to regulatory liabilities for net unrealized gains subject to cost-based regulation. As a result of adopting this revised accounting guidance, for the three months ended March 31, 2018, Dominion Energy and Virginia Power recorded $47 million ($38 million after-tax) and $8 million ($6 million after-tax), respectively, of unrealized losses on equity securities, net of regulatory deferrals, in other income in the Consolidated Statements of Income, resulting in a $0.06 loss per share at Dominion Energy. Derecognition and Partial Sales of Nonfinancial Assets In February 2017, the FASB issued revised accounting guidance clarifying the scope of asset derecognition guidance and accounting for partial sales of nonfinancial assets. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018, and the Companies adopted the standard using the modified retrospective method. Upon adoption of the standard, Dominion Energy recorded the cumulative-effect of a change in accounting principle to reclassify $127 million from noncontrolling interests to common stock related to the sale of a noncontrolling interest in certain merchant solar projects completed in December 2015 and January 2016. Net Periodic Pension and Other Postretirement Benefit Costs In March 2017, the FASB issued revised accounting guidance for the presentation of net periodic pension and other postretirement benefit costs. The update requires that the service cost component of net periodic pension and other postretirement benefit costs be classified in the same line item as other compensation costs arising from services rendered by employees, while other components of net periodic pension and other postretirement costs are classified outside of income from operations. In addition, only the service cost component remains eligible for capitalization during construction. These changes do not impact the accounting by participants in a multi-employer plan. This guidance became effective for the Companies beginning January 1, 2018 with a retrospective adoption for income statement presentation and a prospective adoption for capitalization. Dominion Energy’s and Dominion Energy Gas’ Consolidated Statements of Income for the three months ended March 31, 2017 have been recast to reflect retrospective adoption for the presentation of the non-service cost component of net periodic pension and other postretirement benefit costs. Previously, the non-service cost component for Dominion Energy and Dominion Energy Gas was reflected in other operations and maintenance in the Consolidated Statements of Income, along with the service cost component of net periodic pension and other postretirement benefit costs. Subsequent to the adoption of this guidance, the non-service cost component of net periodic pension and other postretirement benefit costs is recorded in other income in the Consolidated Statements of Income. As previously reported, Dominion Energy’s operations and maintenance expense and other income were $738 million and $116 million, respectively, and Dominion Energy Gas’ other operations and maintenance expense and other income were $133 million and $5 million, respectively. Tax Reform In February 2018, the FASB issued revised accounting guidance to provide clarification on the application of the 2017 Tax Reform Act for balances recorded within AOCI. The revised guidance provides for stranded amounts within AOCI from the impacts of the 2017 Tax Reform Act to be reclassified to retained earnings. The Companies adopted this guidance for interim and annual reporting periods beginning January 1, 2018 on a prospective basis. In connection with the adoption of this guidance, Dominion Energy reclassified a benefit of $289 million from AOCI to retained earnings, Virginia Power reclassified a benefit of $3 million from AOCI to retained earnings and Dominion Energy Gas reclassified a benefit of $26 million from AOCI to membership interests. The amounts reclassified reflect the reduction in the federal income tax rate, and the federal benefit of state income taxes, on the components of the Companies’ AOCI.

Acquisitions and Dispositions

Acquisitions and Dispositions	3 Months Ended
	Mar. 31, 2018
Business Combinations Discontinued Operations And Disposal Groups [Abstract]
Acquisitions and Dispositions	Note 3. Acquisitions and Dispositions Dominion Energy Proposed Acquisition of SCANA Under the terms of the SCANA Merger Agreement announced in January 2018, Dominion Energy has agreed to issue 0.6690 shares of Dominion Energy common stock for each share of SCANA common stock upon closing. In addition, Dominion Energy will provide the financial support for SCE&G to make a $1.3 billion up-front, one-time rate credit to all current electric service customers of SCE&G to be paid within 90 days of closing and a $575 million refund along with the benefit of the 2017 Tax Reform Act resulting in an approximate 7% reduction to SCE&G electric service customers’ bills over an eight-year period as well as the exclusions from rate recovery of approximately $1.7 billion of costs related to the V.C. Summer Units 2 and 3 new nuclear development project and approximately $180 million to purchase the Columbia Energy Center power station. In addition, SCANA’s debt, which currently totals approximately $7.0 billion, is expected to remain outstanding. The transaction requires approval of SCANA’s shareholders, FERC, applicable state commissions and the NRC and clearance from the Federal Trade Commission under the Hart-Scott-Rodino Act. In January 2018, SCANA and Dominion Energy filed for review and approval from the South Carolina Public Service Commission, the North Carolina Utilities Commission, the Georgia Public Service Commission and the NRC. In February 2018, the Federal Trade Commission granted early termination of the waiting period under the Hart-Scott-Rodino Act. Also in February 2018, Dominion Energy and SCANA filed for review and approval by FERC. In March 2018, the Georgia Public Service Commission approved the proposed merger. Dominion Energy is not required to accept an order by the South Carolina Public Service Commission approving Dominion Energy’s merger with SCANA if such order contains any material change to the terms, conditions or undertakings set forth in the cost recovery plan related to the V.C. Summer Units 2 and 3 new nuclear development project or any significant changes to the economic value of the cost recovery plan. In addition, the SCANA Merger Agreement provides that Dominion Energy will have the right to refuse to close the merger if there shall have occurred any substantive change in the Base Load Review Act or other laws governing South Carolina public utilities which has or would reasonably be expected to have an adverse effect on SCE&G. The SCANA Merger Agreement contains certain termination rights for both Dominion Energy and SCANA, and provides that, upon termination of the SCANA Merger Agreement under specified circumstances, Dominion Energy would be required to pay a termination fee of $280 million to SCANA and SCANA would be required to pay Dominion Energy a termination fee of $240 million. Subject to receipt of SCANA shareholder and any required regulatory approvals and meeting closing conditions, Dominion Energy targets closing by the end of 2018. Wholly-Owned Merchant Solar Projects In January 2017, Dominion Energy entered into an agreement to acquire 100% of the equity interests of a solar project in North Carolina from Cypress Creek Renewables, LLC for cash consideration. In May 2017, Dominion Energy closed on the acquisition for $154 million, all of which was allocated to property, plant and equipment. The facility commenced commercial operations in June 2017, at a cost of $160 million, including the initial acquisition cost, and generates approximately 79 MW. In September 2016, Dominion Energy entered into an agreement to acquire 100% of the equity interests of a solar project in Virginia from Community Energy Solar, LLC for cash consideration. In February 2017, Dominion Energy closed on the acquisition for $29 million, all of which was allocated to property, plant and equipment. The facility commenced commercial operations in December 2017, at a cost of $205 million, including the initial acquisition cost, and generates approximately 100 MW. In August 2016, Dominion Energy entered into an agreement to acquire 100% of the equity interests of two solar projects in California from Solar Frontier Americas Holding LLC for cash consideration. In March 2017, Dominion Energy closed on the acquisition of one of the solar projects for $77 million, all of which was allocated to property, plant and equipment. The facility commenced commercial operations in June 2017, at a cost of $78 million, including the initial acquisition cost, and generates approximately 30 MW. In April 2017, Dominion Energy discontinued efforts on the acquisition of the additional 20 MW solar project from Solar Frontier Americas Holding LLC. Long-term power purchase, interconnection and operation and maintenance agreements have been executed for all of the projects described above. These projects are included in Power Generation. Dominion Energy has claimed or will claim federal investment tax credits on these solar projects.

Operating Revenue

Operating Revenue	3 Months Ended
	Mar. 31, 2018
Regulated And Unregulated Operating Revenue [Abstract]
Operating Revenue	Note 4. Operating Revenue The Companies’ operating revenue, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, consists of the following: Three Months Ended March 31, 2018 (millions) Dominion Energy Regulated electric sales: Residential $ 817 Commercial 524 Industrial 107 Government and other retail 213 Wholesale 42 Nonregulated electric sales 418 Regulated gas sales: Residential 364 Commercial 103 Other 10 Nonregulated gas sales 88 Regulated gas transportation and storage: FERC-regulated 262 State-regulated 190 Other regulated revenues 50 Other nonregulated revenues (1)(2) 136 Total operating revenue from contracts with customers 3,324 Other revenues 142 Total operating revenue $ 3,466 Virginia Power Regulated electric sales: Residential $ 817 Commercial 524 Industrial 107 Government and other retail 213 Wholesale 42 Other regulated revenues 32 Other nonregulated revenues (1) 13 Total operating revenue from contracts with customers $ 1,748 Dominion Energy Gas Regulated gas sales: Residential $ 29 Other 7 Nonregulated gas sales (1) 2 Regulated gas transportation and storage: FERC-regulated (1) 199 State-regulated (1) 180 NGL revenue (1)(2) 54 Management service revenue (1) 47 Other regulated revenues (1) 8 Other nonregulated revenues (1) 2 Total operating revenue from contracts with customers 528 Other revenues (1) (2 ) Total operating revenue $ 526 (1) See Notes 10 and 18 for amounts attributable to related parties and affiliates. (2) Amounts above include $30 million and $26 million of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time. The table below discloses the aggregate amount of the transaction price allocated to fixed-price performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period and when the Companies expect to recognize this revenue. These revenues relate to contracts containing fixed prices where the Companies will earn the associated revenue over time as they stand ready to perform services provided. This disclosure does not include revenue related to performance obligations that are part of a contract with original durations of one year or less. In addition, this disclosure does not include expected consideration related to performance obligations for which the Companies elect to recognize revenue in the amount they have a right to invoice. Revenue expected to be recognized on multi-year contracts in place at March 31, 2018 2018 2019 2020 2021 2022 Thereafter Total (millions) Dominion Energy $ 1,251 $ 1,709 $ 1,593 $ 1,474 $ 1,327 $ 14,686 $ 22,040 Virginia Power 16 21 3 1 — — 41 Dominion Energy Gas 479 632 562 473 379 2,084 4,609 Contract assets represent an entity’s right to consideration in exchange for goods and services that the entity has transferred to a customer. At March 31, 2018 and December 31, 2017, Dominion Energy’s contract asset balances were $48 million and $46 million, respectively. Dominion Energy Gas’ contract asset balances were $66 million at both March 31, 2018 and December 31, 2017. Dominion Energy and Dominion Energy Gas’ contract assets are recorded in other deferred charges and other assets in the Consolidated Balance Sheets. Contract liabilities represent an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration, or the amount that is due, from the customer. At March 31, 2018 and December 31, 2017, Dominion Energy’s contract liability balances were $92 million and $132 million, respectively. At March 31, 2018 and December 31, 2017, Virginia Power’s contract liability balances were $48 million and $50 million, respectively. At March 31, 2018 and December 31, 2017, Dominion Energy Gas’ contract liability balances were $14 million and $41 million, respectively. During the first quarter of 2018, Dominion Energy, Virginia Power and Dominion Energy Gas recognized revenue of $116 million, $50 million and $40 million, respectively, from the beginning contract liability balances as the Companies fulfilled their obligations to provide service to their customers. The Companies’ contract liabilities are recorded in other current liabilities and other deferred credits and other liabilities in the Consolidated Balance Sheets. The Companies’ operating revenue, prior to the adoption of revised guidance for revenue recognition from contracts with customers, consisted of the following: Three Months Ended March 31, 2017 (millions) Dominion Energy Electric sales: Regulated $ 1,766 Nonregulated 427 Gas sales: Regulated 448 Nonregulated 144 Gas transportation and storage 492 Other 107 Total operating revenue $ 3,384 Virginia Power Regulated electric sales $ 1,766 Other 65 Total operating revenue $ 1,831 Dominion Energy Gas Gas sales: Regulated $ 32 Nonregulated 2 Gas transportation and storage 396 Other 60 Total operating revenue $ 490

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
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 Dominion Energy Gas Three Months Ended March 31, 2018 2017 2018 2017 2018 2017 U.S. statutory rate 21.0 % 35.0 % 21.0 % 35.0 % 21.0 % 35.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 4.1 2.8 4.5 3.8 4.3 0.3 Investment tax credits (0.5 ) (4.2 ) (0.9 ) (0.8 ) — — Production tax credits (0.6 ) (0.8 ) (0.7 ) (0.6 ) — — Reversal of excess deferred income taxes (1.4 ) — (2.0 ) — (1.0 ) — Other, net (2.1 ) (3.8 ) (0.3 ) (0.6 ) (0.4 ) (0.6 ) Effective tax rate 20.5 % 29.0 % 21.6 % 36.8 % 23.9 % 34.7 % The 2017 Tax Reform Act reduced the statutory federal income tax rate to 21% beginning in January 2018. Accordingly, current income taxes, and deferred income taxes that originate in 2018, are being recorded at the new 21% rate. 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%. For the three months ended March 31, 2018, the Companies have recorded an estimate of the portion of excess deferred income tax amortization expected to occur in 2018. The reversal of these excess deferred income taxes will impact the effective tax rate, and may ultimately impact rates charged to customers. As described in Note 13 to the Consolidated Financial Statements, the Companies decreased revenue and increased regulatory liabilities to offset these deferred tax impacts in accordance with applicable regulatory commission orders or formula rate mechanisms. Beginning in 2018, the 2017 Tax Reform Act limits the deductibility of interest expense to 30% of adjusted taxable income for certain businesses, with any disallowed interest carried forward indefinitely. Subject to additional guidance in yet to be issued regulations, the Companies expect interest expense to be deductible in 2018. The Companies continue to evaluate the changes in accelerated depreciation for income tax purposes and state conformity to the provisions of the 2017 Tax Reform Act. As of March 31, 2018, there have been no changes to the provisional amounts recorded at December 31, 2017. See Note 5 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017 for a discussion of the impacts of the 2017 Tax Reform Act.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 2017 (millions, except EPS) Net income attributable to Dominion Energy $ 503 $ 632 Average shares of common stock outstanding – Basic 650.5 628.1 Net effect of dilutive securities — — Average shares of common stock outstanding – Diluted 650.5 628.1 Earnings Per Common Share – Basic $ 0.77 $ 1.01 Earnings Per Common Share – Diluted $ 0.77 $ 1.01 The 2014 Equity Units are potentially dilutive securities, but were excluded from the calculation of diluted EPS for the three months ended March 31, 2017, as the diluted stock price threshold was not met. The 2016 Equity Units are potentially dilutive securities, but were excluded from the calculation of diluted EPS for the three months ended March 31, 2018 and 2017, as the dilutive stock price threshold was not met. The Dominion Energy Midstream convertible preferred units are potentially dilutive securities but had no effect on the calculation of diluted EPS for the three months ended March 31, 2018 and 2017.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Note 7. Accumulated Other Comprehensive Income 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 March 31, 2018 Beginning balance $ (302 ) $ 747 $ (1,101 ) $ (3 ) $ (659 ) Other comprehensive income before reclassifications: gains (losses) 111 (13 ) — — 98 Amounts reclassified from AOCI: losses (1) 8 1 25 — 34 Net current period other comprehensive income (loss) 119 (12 ) 25 — 132 Cumulative-effect of changes in accounting principle (64 ) (732 ) (227 ) — (1,023 ) Less other comprehensive income attributable to noncontrolling interest 1 — — — 1 Ending balance $ (248 ) $ 3 $ (1,303 ) $ (3 ) $ (1,551 ) Three Months Ended March 31, 2017 Beginning balance $ (280 ) $ 569 $ (1,082 ) $ (6 ) $ (799 ) Other comprehensive income before reclassifications: gains 43 58 — 1 102 Amounts reclassified from AOCI: (gains) losses (1) (23 ) (28 ) 13 — (38 ) Net current period other comprehensive income 20 30 13 1 64 Ending balance $ (260 ) $ 599 $ (1,069 ) $ (5 ) $ (735 ) (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 March 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 12 Operating revenue 2 Purchased gas (7 ) Electric fuel and other energy-related purchases Interest rate contracts 12 Interest and related charges Foreign currency contracts (8 ) Other income Total 11 Tax (3 ) Income tax expense Total, net of tax $ 8 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ 1 Other income Total 1 Tax — Income tax expense 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 31 Other income Total 26 Tax (1 ) Income tax expense Total, net of tax $ 25 Three Months Ended March 31, 2017 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (62 ) Operating revenue (1 ) Purchased gas 1 Electric fuel and other energy-related purchases Interest rate contracts 11 Interest and related charges Foreign currency contracts 14 Other income Total (37 ) Tax 14 Income tax expense Total, net of tax $ (23 ) Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (53 ) Other income Impairment 9 Other income Total (44 ) Tax 16 Income tax expense Total, net of tax $ (28 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (4 ) Other income Amortization of actuarial losses 25 Other income Total 21 Tax (8 ) Income tax expense Total, net of tax $ 13 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 March 31, 2018 Beginning balance $ (12 ) $ 74 $ 62 Other comprehensive income before reclassifications: gains (losses) 5 — 5 Amounts reclassified from AOCI: (gains) losses — — — Net current period other comprehensive income (loss) 5 — 5 Cumulative-effect of changes in accounting principle (3 ) (73 ) (76 ) Ending balance $ (10 ) $ 1 $ (9 ) Three Months Ended March 31, 2017 Beginning balance $ (8 ) $ 54 $ 46 Other comprehensive income before reclassifications: gains — 7 7 Amounts reclassified from AOCI: (gains) (1) — (3 ) (3 ) Net current period other comprehensive income — 4 4 Ending balance $ (8 ) $ 58 $ 50 (1) See table below for details about these reclassifications. The following table presents Virginia Power’s reclassifications out of AOCI by component: Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended March 31, 2017 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (6 ) Other income Impairment 1 Other income Total (5 ) Tax 2 Income tax expense Total, net of tax $ (3 ) Dominion Energy Gas The following table presents Dominion Energy Gas’ changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrecognized pension costs Total (millions) Three Months Ended March 31, 2018 Beginning balance $ (23 ) $ (75 ) $ (98 ) Other comprehensive income before reclassifications: gains 13 — 13 Amounts reclassified from AOCI: (gains) losses (1) (3 ) 1 (2 ) Net current period other comprehensive income 10 1 11 Cumulative-effect of changes in accounting principle (5 ) (21 ) (26 ) Ending balance $ (18 ) $ (95 ) $ (113 ) Three Months Ended March 31, 2017 Beginning balance $ (24 ) $ (99 ) $ (123 ) Other comprehensive income before reclassifications: losses (9 ) — (9 ) Amounts reclassified from AOCI: losses (1) 11 — 11 Net current period other comprehensive income 2 — 2 Ending balance $ (22 ) $ (99 ) $ (121 ) (1) See table below for details about these reclassifications. The following table presents Dominion Energy Gas' reclassifications out of AOCI by component: Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended March 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 3 Operating revenue Interest rate contracts 1 Interest and related charges Foreign currency contracts (8 ) Other income Total (4 ) Tax 1 Income tax expense Total, net of tax $ (3 ) Unrecognized pension costs: Actuarial losses $ 2 Other income Total 2 Tax (1 ) Income tax expense Total, net of tax $ 1 Three Months Ended March 31, 2017 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 3 Operating revenue Interest rate contracts 1 Interest and related charges Foreign currency contracts 14 Other income Total 18 Tax (7 ) Income tax expense Total, net of tax $ 11 Unrecognized pension costs: Actuarial losses $ 1 Other income Total 1 Tax (1 ) Income tax expense Total, net of tax $ —

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
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, 2017. 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 unobservable inputs are developed and substantiated using historical information, available market data, third-party data, and statistical analysis. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party pricing sources. The following table presents Dominion Energy's quantitative information about Level 3 fair value measurements at March 31, 2018. 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 and futures: Natural gas (2) $ 83 Discounted cash flow Market price (per Dth) (3) (2) - 6 — FTRs 9 Discounted cash flow Market price (per MWh) (3) (1) - 6 1 Physical options: Natural gas 1 Option model Market price (per Dth) (3) 2 - 6 3 Price volatility (4) 14% - 29% 23 % Electricity 29 Option model Market price (per MWh) (3) 23 - 49 35 Price volatility (4) 7% - 63% 27 % Total assets $ 122 Liabilities Financial forwards: FTRs $ 2 Discounted cash flow Market price (per MWh) (3) (5) - 6 — Total liabilities $ 2 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets. Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable 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) 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 March 31, 2018 Assets Derivatives: Commodity $ — $ 34 $ 122 $ 156 Interest rate — 44 — 44 Foreign currency — 44 — 44 Investments (1) Equity securities: U.S. 3,435 — — 3,435 Fixed income securities: Corporate debt instruments — 445 — 445 Government securities 302 811 — 1,113 Cash equivalents and other 12 — — 12 Total assets $ 3,749 $ 1,378 $ 122 $ 5,249 Liabilities Derivatives: Commodity $ — $ 29 $ 2 $ 31 Interest rate — 58 — 58 Foreign currency — 1 — 1 Total liabilities $ — $ 88 $ 2 $ 90 At December 31, 2017 Assets Derivatives: Commodity $ — $ 101 $ 157 $ 258 Interest rate — 17 — 17 Foreign currency — 32 — 32 Investments (1) Equity securities: U.S. 3,493 — — 3,493 Fixed income securities: Corporate debt instruments — 444 — 444 Government securities 307 794 — 1,101 Cash equivalents and other 34 — — 34 Total assets $ 3,834 $ 1,388 $ 157 $ 5,379 Liabilities Derivatives: Commodity $ — $ 190 $ 7 $ 197 Interest rate — 85 — 85 Foreign currency — 2 — 2 Total liabilities $ — $ 277 $ 7 $ 284 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $195 million and $88 million of assets at March 31, 2018 and December 31, 2017, 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 March 31, 2018 2017 (millions) Beginning balance $ 150 $ 139 Total realized and unrealized gains (losses): Included in earnings (18 ) (15 ) Included in other comprehensive income 1 — Included in regulatory assets/liabilities (21 ) (9 ) Settlements 7 12 Transfers out of Level 3 1 3 Ending balance $ 120 $ 130 The following table presents Dominion Energy’s classification of gains and losses included in earnings in the Level 3 fair value category. The unrealized gains or losses included in earnings in the Level 3 fair value category relating to assets/liabilities still held at the reporting date were not material for the three months ended March 31, 2018 and 2017. Operating Revenue Electric Fuel and Other Energy-Related Purchases Total (millions) Three Months Ended March 31, 2018 Total gains (losses) included in earnings $ (1 ) $ (17 ) $ (18 ) Three Months Ended March 31, 2017 Total gains (losses) included in earnings $ — $ (15 ) $ (15 ) Virginia Power The following table presents Virginia Power's quantitative information about Level 3 fair value measurements at March 31, 2018. 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 and futures: Natural gas (2) $ 81 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 8 Discounted cash flow Market price (per MWh) (3) (1) - 6 1 Physical options: Natural gas 1 Option model Market price (per Dth) (3) 2 - 6 3 Price volatility (4) 14% - 29% 23 % Electricity 29 Option model Market price (per MWh) (3) 23 - 49 35 Price volatility (4) 7% - 63% 27 % Total assets $ 119 Liabilities Financial forwards: FTRs $ 2 Discounted cash flow Market price (per MWh) (3) (5) - 6 — Total liabilities $ 2 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets . Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable 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 March 31, 2018 Assets Derivatives: Commodity $ — $ 4 $ 119 $ 123 Interest rate — 6 — 6 Investments (1) Equity securities: U.S. 1,539 — — 1,539 Fixed income securities: Corporate debt instruments — 221 — 221 Government securities 173 327 — 500 Cash equivalents and other 3 — — 3 Total assets $ 1,715 $ 558 $ 119 $ 2,392 Liabilities Derivatives: Commodity $ — $ 7 $ 2 $ 9 Interest rate — 14 — 14 Total liabilities $ — $ 21 $ 2 $ 23 At December 31, 2017 Assets Derivatives: Commodity $ — $ 14 $ 152 $ 166 Investments (1) Equity securities: U.S. 1,566 — — 1,566 Fixed income securities: Corporate debt instruments — 224 — 224 Government securities 168 326 — 494 Cash equivalents and other 16 — — 16 Total assets $ 1,750 $ 564 $ 152 $ 2,466 Liabilities Derivatives: Commodity $ — $ 4 $ 5 $ 9 Interest rate — 57 — 57 Total liabilities $ — $ 61 $ 5 $ 66 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $135 million and $27 million of assets at March 31, 2018 and December 31, 2017, 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 March 31, 2018 2017 (millions) Beginning balance $ 147 $ 143 Total realized and unrealized losses: Included in earnings (17 ) (15 ) Included in regulatory assets/liabilities (19 ) (8 ) Settlements 6 12 Ending balance $ 117 $ 132 The gains and losses included in earnings in the Level 3 fair value category were classified in electric fuel and other energy-related purchases in Virginia Power's Consolidated Statements of Income for the three months ended March 31, 2018 and 2017. 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 months ended March 31, 2018 and 2017. Dominion Energy Gas The following table presents Dominion Energy Gas' assets and liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions. Level 1 Level 2 Level 3 Total (millions) At March 31, 2018 Assets Foreign currency $ — $ 44 $ — $ 44 Total assets $ — $ 44 $ — $ 44 Liabilities Foreign currency $ — $ 1 $ — $ 1 Total liabilities $ — $ 1 $ — $ 1 At December 31, 2017 Assets Foreign currency $ — $ 32 $ — $ 32 Total assets $ — $ 32 $ — $ 32 Liabilities Commodity $ — $ 4 $ 2 $ 6 Foreign currency — 2 — 2 Total liabilities $ — $ 6 $ 2 $ 8 The following table presents the net change in Dominion Energy Gas' assets and liabilities for derivatives measured at fair value on a recurring basis and included in the Level 3 fair value category. Three Months Ended March 31, 2018 2017 (millions) Beginning balance $ (2 ) $ (2 ) Total realized and unrealized gains (losses): Included in other comprehensive income (loss) 1 (1 ) Transfers out of Level 3 1 3 Ending balance $ — $ — There were no gains or losses included in earnings in the Level 3 fair value category for the three months ended March 31, 2018 and 2017. 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 months ended March 31, 2018 and 2017. Fair Value of Financial Instruments Substantially all of the Companies' financial instruments are recorded at fair value, with the exception of the instruments described below, which are reported at historical cost. Estimated fair values have been determined using available market information and valuation methodologies considered appropriate by management. The carrying amount of cash and cash equivalents, 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: March 31, 2018 December 31, 2017 Carrying Amount Estimated Fair Value (1) Carrying Amount Estimated Fair Value (1) (millions) Dominion Energy Long-term debt, including securities due within one year (2) $ 29,362 $ 31,044 $ 28,666 $ 31,233 Junior subordinated notes (3) 3,980 4,017 3,981 4,102 Remarketable subordinated notes (3) 1,381 1,299 1,379 1,446 Virginia Power Long-term debt, including securities due within one year (3) $ 11,690 $ 12,702 $ 11,346 $ 12,842 Dominion Energy Gas Long-term debt, including securities due within one year (4) $ 3,579 $ 3,657 $ 3,570 $ 3,719 (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 issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value. (2) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At March 31, 2018 and December 31, 2017, includes the valuation of certain fair value hedges associated with fixed rate debt of $(54) million and $(22) million, respectively. (3) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium. (4) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.

Derivatives and Hedge Accountin

Derivatives and Hedge Accounting Activities	3 Months Ended
	Mar. 31, 2018
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, 2017. 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. Dominion Energy's 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. Virginia Power's and Dominion Energy Gas' derivative contracts include over-the-counter transactions. 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 security, none of which are subject to restrictions. Cash collateral is used in the table below to offset derivative assets and liabilities. Certain accounts receivable and accounts payable recognized on the Companies' Consolidated Balance Sheets, as well as letters of credit and other forms of security, 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 17 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, before and after the effects of offsetting: March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 132 $ — $ 132 $ 174 $ — $ 174 Exchange 20 — 20 80 — 80 Interest rate contracts: Over-the-counter 44 — 44 17 — 17 Foreign currency contracts: Over-the-counter 44 — 44 32 — 32 Total derivatives, subject to a master netting or similar arrangement 240 — 240 303 — 303 Total derivatives, not subject to a master netting or similar arrangement 4 — 4 4 — 4 Total $ 244 $ — $ 244 $ 307 $ — $ 307 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 132 $ 5 $ — $ 127 $ 174 $ 9 $ — $ 165 Exchange 20 19 — 1 80 80 — — Interest rate contracts: Over-the-counter 44 9 — 35 17 8 — 9 Foreign currency contracts: Over-the-counter 44 1 — 43 32 2 — 30 Total $ 240 $ 34 $ — $ 206 $ 303 $ 99 $ — $ 204 March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 12 $ — $ 12 $ 76 $ — $ 76 Exchange 19 — 19 120 — 120 Interest rate contracts: Over-the-counter 58 — 58 85 — 85 Foreign currency contracts: Over-the-counter 1 — 1 2 — 2 Total derivatives, subject to a master netting or similar arrangement 90 — 90 283 — 283 Total derivatives, not subject to a master netting or similar arrangement — — — 1 — 1 Total $ 90 $ — $ 90 $ 284 $ — $ 284 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 12 $ 5 $ — $ 7 $ 76 $ 9 $ 6 $ 61 Exchange 19 19 — — 120 80 40 — Interest rate contracts: Over-the-counter 58 9 — 49 85 8 — 77 Foreign currency contracts: Over-the-counter 1 1 — — 2 2 — — Total $ 90 $ 34 $ — $ 56 $ 283 $ 99 $ 46 $ 138 Volumes The following table presents the volume of Dominion Energy’s derivative activity at March 31, 2018. 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) 70 24 Basis 233 600 Electricity (MWh): Fixed price (1) 9,637,759 919,920 FTRs 19,630,088 — Liquids (Gal) (2) 60,630,000 — Interest rate (3) $ 1,400,000,000 $ 4,790,445,562 Foreign currency (3)(4) $ — $ 280,000,000 (1) Includes options. (2) Includes NGLs and oil. (3) Maturity is determined based on final settlement period. (4) Euro equivalent volumes are €250,000,000. Ineffectiveness and AOCI For the three months ended March 31, 2018 and 2017, gains or losses on hedging instruments determined to be ineffective and amounts excluded from the assessment of effectiveness were not material. Amounts excluded from the assessment of effectiveness include changes in the differences between spot prices and forward prices. The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy’s Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Commodities: Gas $ (3 ) $ (2 ) 31 months Electricity 6 5 20 months Interest rate (262 ) (10 ) 381 months Foreign currency 11 (1 ) 99 months Total $ (248 ) $ (8 ) The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., anticipated sales) in earnings, thereby achieving the realization of prices contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in market prices, interest rates and foreign currency exchange rates. Fair Value and Gains and Losses on Derivative Instruments The following table presents the fair values of Dominion Energy’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) March 31, 2018 ASSETS Current Assets Commodity $ 17 $ 61 $ 78 Interest rate 16 — 16 Total current derivative assets (1) 33 61 94 Noncurrent Assets Commodity 1 77 78 Interest rate 28 — 28 Foreign currency 44 — 44 Total noncurrent derivative assets (2) 73 77 150 Total derivative assets $ 106 $ 138 $ 244 LIABILITIES Current Liabilities Commodity $ 12 $ 17 $ 29 Interest rate 19 — 19 Foreign currency 1 — 1 Total current derivative liabilities (3) 32 17 49 Noncurrent Liabilities Commodity 1 1 2 Interest rate 39 — 39 Total noncurrent derivative liabilities (4) 40 1 41 Total derivative liabilities $ 72 $ 18 $ 90 December 31, 2017 ASSETS Current Assets Commodity $ 5 $ 158 $ 163 Interest rate 6 — 6 Total current derivative assets (1) 11 158 169 Noncurrent Assets Commodity — 95 95 Interest rate 11 — 11 Foreign currency 32 — 32 Total noncurrent derivative assets (2) 43 95 138 Total derivative assets $ 54 $ 253 $ 307 LIABILITIES Current Liabilities Commodity 103 92 195 Interest rate 53 — 53 Foreign currency 2 — 2 Total current derivative liabilities (3) 158 92 250 Noncurrent Liabilities Commodity 1 1 2 Interest rate 32 — 32 Total noncurrent derivative liabilities (4) 33 1 34 Total derivative liabilities $ 191 $ 93 $ 284 (1) Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets. (3) Current derivative liabilities are presented in other current liabilities in Dominion Energy's Consolidated Balance Sheets. (4) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets. The following tables present the gains and losses on Dominion Energy's derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended March 31, 2018 Derivative type and location of gains (losses): Commodity: Operating revenue $ (12 ) Purchased gas (2 ) Electric fuel and other energy-related purchases 7 Total commodity $ 97 $ (7 ) $ — Interest rate (3) 38 (12 ) 68 Foreign currency (4) 13 8 — Total $ 148 $ (11 ) $ 68 Three Months Ended March 31, 2017 Derivative type and location of gains (losses): Commodity: Operating revenue $ 62 Purchased gas 1 Electric fuel and other energy-related purchases (1 ) Total commodity $ 87 $ 62 $ — Interest rate (3) 1 (11 ) 8 Foreign currency (4) (18 ) (14 ) — Total $ 70 $ 37 $ 8 (1) Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income. (3) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income. Derivatives not designated as hedging instruments Amount of Gain (Loss) Recognized in Income on Derivatives (1) Three Months Ended March 31, 2018 2017 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ 6 $ 4 Purchased gas — 16 Electric fuel and other energy-related purchases (13 ) (23 ) Other operations & maintenance — (1 ) Total $ (7 ) $ (4 ) (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, before and after the effects of offsetting: March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 118 $ — $ 118 $ 155 $ — $ 155 Interest rate contracts: Over-the-counter 6 — 6 — — — Total derivatives, subject to a master netting or similar arrangement 124 — 124 155 — 155 Total derivatives, not subject to a master netting or similar arrangement 5 — 5 11 — 11 Total $ 129 $ — $ 129 $ 166 $ — $ 166 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 118 $ 2 $ — $ 116 $ 155 $ 4 $ — $ 151 Interest rate contracts: Over-the-counter 6 3 — 3 — — — — Total $ 124 $ 5 $ — $ 119 $ 155 $ 4 $ — $ 151 March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 2 $ — $ 2 $ 4 $ — $ 4 Interest rate contracts: Over-the-counter 14 — 14 57 — 57 Total derivatives, subject to a master netting or similar arrangement 16 — 16 61 — 61 Total derivatives, not subject to a master netting or similar arrangement 7 — 7 5 — 5 Total $ 23 $ — $ 23 $ 66 $ — $ 66 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 2 $ 2 $ — $ — $ 4 $ 4 $ — $ — Interest rate contracts: Over-the-counter 14 3 — 11 57 — — 57 Total $ 16 $ 5 $ — $ 11 $ 61 $ 4 $ — $ 57 Volumes The following table presents the volume of Virginia Power’s derivative activity at March 31, 2018. 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) 21 4 Basis 132 532 Electricity (MWh): Fixed price (1) 1,445,264 — FTRs 17,179,279 — Interest rate (2) $ 600,000,000 $ 900,000,000 (1) Includes options. (2) Maturity is determined based on final settlement period. Ineffectiveness and AOCI For the three months ended March 31, 2018 and 2017, gains or losses on hedging instruments determined to be ineffective were not material. The following table presents selected information related to losses on cash flow hedges included in AOCI in Virginia Power’s Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (10 ) $ (1 ) 381 months Total $ (10 ) $ (1 ) The amounts that will be reclassified from AOCI to earnings will generally be offset by the recognition of the hedged transactions (e.g., interest payments) in earnings, thereby achieving the realization of interest rates contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in interest rates. Fair Value and Gains and Losses on Derivative Instruments The following 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) March 31, 2018 ASSETS Current Assets Commodity $ — $ 48 $ 48 Interest rate 2 — 2 Total current derivative assets (1) 2 48 50 Noncurrent Assets Commodity — 75 75 Interest rate 4 — 4 Total noncurrent derivative assets (2) 4 75 79 Total derivative assets $ 6 $ 123 $ 129 LIABILITIES Current Liabilities Commodity $ — $ 9 $ 9 Interest rate 11 — 11 Total current derivative liabilities (3) 11 9 20 Noncurrent Liabilities Interest rate 3 — 3 Total noncurrent derivatives liabilities (4) 3 — 3 Total derivative liabilities $ 14 $ 9 $ 23 December 31, 2017 ASSETS Current Assets Commodity $ — $ 75 $ 75 Total current derivative assets (1) — 75 75 Noncurrent Assets Commodity — 91 91 Total noncurrent derivative assets (2) — 91 91 Total derivative assets $ — $ 166 $ 166 LIABILITIES Current Liabilities Commodity $ — $ 9 $ 9 Interest rate 44 — 44 Total current derivative liabilities (3) 44 9 53 Noncurrent Liabilities Interest rate 13 — 13 Total noncurrent derivatives liabilities (4) 13 — 13 Total derivative liabilities $ 57 $ 9 $ 66 (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) Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets. (4) 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 (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended March 31, 2018 Derivative type and location of gains (losses): Interest rate (3) $ 7 $ — $ 68 Total $ 7 $ — $ 68 Three Months Ended March 31, 2017 Derivative type and location of gains (losses): Interest rate (3) $ — $ — $ 8 Total $ — $ — $ 8 (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 March 31, 2018 2017 (millions) Derivative type and location of gains (losses): Commodity (2) $ — $ (17 ) Total $ — $ (17 ) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in electric fuel and other energy-related purchases. Dominion Energy Gas Balance Sheet Presentation The tables below present Dominion Energy Gas' derivative asset and liability balances by type of financial instrument, before and after the effects of offsetting. March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Foreign currency contracts: Over-the-counter $ 44 $ — $ 44 $ 32 $ — $ 32 Total derivatives, subject to a master netting or similar arrangement $ 44 $ — $ 44 $ 32 $ — $ 32 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Foreign currency contracts: Over-the-counter $ 44 $ 1 $ — $ 43 $ 32 $ 2 $ — $ 30 Total $ 44 $ 1 $ — $ 43 $ 32 $ 2 $ — $ 30 March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ — $ — $ — $ 6 $ — $ 6 Foreign currency contracts: Over-the-counter 1 — 1 2 — 2 Total derivatives, subject to a master netting or similar arrangement $ 1 $ — $ 1 $ 8 $ — $ 8 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts Over-the-counter $ — $ — $ — $ — $ 6 $ — $ — $ 6 Foreign currency contracts: Over-the-counter 1 1 — — 2 2 — — Total $ 1 $ 1 $ — $ — $ 8 $ 2 $ — $ 6 Volumes The following table presents the volume of Dominion Energy Gas' derivative activity at March 31, 2018. 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 NGLs (Gal) 55,254,000 — Foreign currency (1) $ — $ 280,000,000 (1) Maturity is determined based on final settlement period. Euro equivalent volumes are €250,000,000. Ineffectiveness and AOCI For the three months ended March 31, 2018 and 2017, gains or losses on hedging instruments determined to be ineffective were not material. The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy Gas' Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate (29 ) (3 ) 321 months Foreign currency 11 (1 ) 99 months Total $ (18 ) $ (4 ) 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 prices contemplated by the underlying risk management strategies and will vary from the expected amounts presented above as a result of changes in market prices, interest rates and foreign currency exchange rates. Fair Value and Gains and Losses on Derivative Instruments The following tables present the fair values of Dominion Energy Gas' 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) March 31, 2018 ASSETS Noncurrent Assets Foreign currency $ 44 $ — $ 44 Total noncurrent derivative assets (1) 44 — 44 Total derivative assets $ 44 $ — $ 44 LIABILITIES Current Liabilities Foreign currency $ 1 $ — $ 1 Total current derivative liabilities (2) 1 — 1 Total derivative liabilities $ 1 $ — $ 1 December 31, 2017 ASSETS Noncurrent Assets Foreign currency $ 32 $ — $ 32 Total noncurrent derivative assets (1) 32 — 32 Total derivative assets $ 32 $ — $ 32 LIABILITIES Current Liabilities Commodity $ 6 $ — $ 6 Foreign currency 2 — 2 Total current derivative liabilities (2) 8 — 8 Total derivative liabilities $ 8 $ — $ 8 (1) Noncurrent derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets. (2) Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets. The following table presents the gains and losses on Dominion Energy Gas' derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income (millions) Three Months Ended March 31, 2018 Derivative Type and Location of Gains (Losses): Commodity: Operating revenue $ (3 ) Total commodity $ 4 $ (3 ) Interest rate (2) — (1 ) Foreign currency (3) 13 8 Total $ 17 $ 4 Three Months Ended March 31, 2017 Derivative Type and Location of Gains (Losses): Commodity: Operating revenue $ (3 ) Total commodity $ 2 $ (3 ) Interest rate (2) — (1 ) Foreign currency (3) (18 ) (14 ) Total $ (16 ) $ (18 ) (1) Amounts deferred into AOCI have no associated effect in Dominion Energy Gas' Consolidated Statements of Income. (2) Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in interest and related charges. (3) Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in other income.

Investments

Investments	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Investments	Note 10. Investments Dominion Energy Equity and Debt Securities Rabbi Trust Securities Equity and debt securities and cash equivalents in Dominion Energy’s rabbi trusts and classified as trading totaled $114 Decommissioning Trust Securities Dominion Energy holds equity and debt securities, cash equivalents and cost method investments in nuclear decommissioning trust funds to fund future decommissioning costs for its nuclear plants. Dominion Energy’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) March 31, 2018 Equity securities: (1) U.S. $ 1,676 $ 1,824 $ (15 ) $ 3,485 Fixed income securities: (2) Corporate debt instruments 442 9 (6 ) 445 Government securities 1,061 17 (12 ) 1,066 Common/collective trust funds 56 — — 56 Cash equivalents and other (4) 8 — — 8 Total $ 3,243 $ 1,850 $ (33 ) (3) $ 5,060 December 31, 2017 Equity securities: (2) U.S. $ 1,569 $ 1,857 $ — $ 3,426 Fixed income securities: (2) Corporate debt instruments 430 15 (1 ) 444 Government securities 1,039 27 (5 ) 1,061 Common/collective trust funds 60 — — 60 Cost method investments 68 — — 68 Cash equivalents and other (4) 34 — — 34 Total $ 3,200 $ 1,899 $ (6 ) (3) $ 5,093 (1) Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2 . (3) The fair value of securities in an unrealized loss position was $1.1 billion and $565 million (4) Includes pending sales of securities of $3 million and The portion of unrealized gains and losses that relates to equity securities held within Dominion Energy’s nuclear decommissioning trusts is summarized below: March 31, 2018 (millions) Net losses recognized during the period $ (65 ) Less: Net gains recognized during the period on securities sold during the period (19 ) Unrealized losses recognized during the period on securities still held at March 31, 2018 (1) $ (84 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. The fair value of Dominion Energy’s debt securities with readily determinable fair values held in nuclear decommissioning trust funds at March 31, 2018 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 165 Due after one year through five years 375 Due after five years through ten years 375 Due after ten years 652 Total $ 1,567 Presented below is selected information regarding Dominion Energy’s equity and debt securities with readily determinable fair values held in nuclear decommissioning trust funds. Three Months Ended March 31, 2018 2017 (millions) Proceeds from sales $ 419 $ 756 Realized gains (1) 36 94 Realized losses (1) 19 20 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability. Other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds recognized in earnings for Dominion Energy were not material for the three months ended March 31, 2018 and 2017. Virginia Power Virginia Power holds equity and debt securities, cash equivalents and cost method investments in nuclear decommissioning trust funds to fund future decommissioning costs for its nuclear plants. Virginia Power’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) March 31, 2018 Equity securities: (1) U.S. $ 828 $ 829 $ (9 ) $ 1,648 Fixed income securities: (2) Corporate debt instruments 219 4 (2 ) 221 Government securities 496 8 (5 ) 499 Common/collective trust funds 25 — — 25 Cash equivalents and other (4) 7 — — 7 Total $ 1,575 $ 841 $ (16 ) (3) $ 2,400 December 31, 2017 Equity securities: (2) U.S. $ 734 $ 831 $ — $ 1,565 Fixed income securities: (2) Corporate debt instruments 216 8 — 224 Government securities 482 13 (2 ) 493 Common/collective trust funds 27 — — 27 Cost method investments 68 — — 68 Cash equivalents and other (4) 22 — — 22 Total $ 1,549 $ 852 $ (2 ) (3) $ 2,399 (1) Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2 . (3) The fair value of securities in an unrealized loss position was $ (4) Includes pending sales of securities of $4 million and The portion of unrealized gains and losses that relates to equity securities held within Virginia Power’s nuclear decommissioning trusts is summarized below: March 31, 2018 (millions) Net losses recognized during the period $ (32 ) Less: Net gains recognized during the period on securities sold during the period (15 ) Unrealized losses recognized during the period on securities still held at March 31, 2018 (1) $ (47 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. The fair value of Virginia Power’s debt securities with readily determinable fair values held in nuclear decommissioning trust funds at March 31, 2018 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 43 Due after one year through five years 155 Due after five years through ten years 208 Due after ten years 339 Total $ 745 Presented below is selected information regarding Virginia Power’s equity and debt securities with readily determinable fair values held in nuclear decommissioning trust funds. Three Months Ended March 31, 2018 2017 (millions) Proceeds from sales $ 218 $ 330 Realized gains (1) 18 45 Realized losses (1) 5 10 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability. Other-than-temporary impairment losses on investments held in nuclear decommissioning trust funds recognized in earnings for Virginia Power were not material for the three months ended March 31, 2018 and 2017. Equity Method Investments Dominion Energy Atlantic Coast Pipeline Dominion Energy contributed $78 million and $117 million during the three months ended March 31, 2018 and 2017, respectively, to Atlantic Coast Pipeline. DETI provides services to Atlantic Coast Pipeline which totaled $46 million and $31 million for the three months ended March 31, 2018 and 2017, respectively, included in operating revenue in Dominion Energy and Dominion Energy Gas’ Consolidated Statements of Income. Amounts receivable related to these services were $17 million and $12 million at March 31, 2018 and December 31, 2017, respectively, composed entirely of accrued unbilled revenue, included in other receivables in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets. In October 2017, Dominion Energy entered into a guarantee agreement to support a portion of Atlantic Coast Pipeline’s obligation under its credit facility. See Note 16 for more information. NedPower Dominion Energy has a liability of $9 million and $17 million recorded to other deferred credits and other liabilities on the Consolidated Balance Sheets at March 31, 2018 and December 31, 2017, respectively, relating to its commitment to provide further financial support for NedPower. Dominion Energy Gas Iroquois Dominion Energy Gas' equity earnings totaled $9 million

Property Plant and Equipment

Property Plant and Equipment	3 Months Ended
	Mar. 31, 2018
Property Plant And Equipment [Abstract]
Property Plant and Equipment	Note 11. Property, Plant and Equipment Virginia Power Assignment of Tower Rental Portfolio Virginia Power rents space on certain of its electric transmission towers to various wireless carriers for communications antennas and other equipment. In March 2017, Virginia Power sold its rental portfolio to Vertical Bridge Towers II, LLC for $91 million in cash. The proceeds are subject to Virginia Power's FERC-regulated tariff, under which it is required to return half of the proceeds to customers. Virginia Power recorded $2 million in operating revenue and $7 million in other income for the three months ended March 31, 2018 and 2017, respectively, with $33 million remaining to be recognized ratably through 2023. Dominion Energy Gas Assignment of Shale Development Rights In November 2014, Dominion Energy Gas closed an agreement with a natural gas producer to convey over time approximately 24,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields. In January 2018, Dominion Energy Gas and the natural gas producer closed on an amendment to the agreement, which included the conveyance of Dominion Energy Gas’ remaining 50% interest in approximately 18,000 acres and the elimination of Dominion Energy Gas’ overriding royalty interest in gas produced from all acreage. In February 2018, Dominion Energy Gas received proceeds of $28 million, resulting in an approximately $28 million ($20 million after-tax) gain recorded in other operations and maintenance expense in Dominion Energy Gas’ Consolidated Statements of Income. In March 2018, Dominion Energy Gas closed an agreement with a natural gas producer to convey approximately 11,000 acres of Utica and Point Pleasant Shale development rights underneath one of its natural gas storage fields. The agreement provided for a payment to Dominion Energy Gas, subject to customary adjustments, of $16 million. In March 2018, Dominion Energy Gas received cash proceeds of $16 million associated with the conveyance of the acreage, resulting in a $16 million ($12 million after-tax) gain recorded in other operations and maintenance expense in Dominion Energy Gas’ Consolidated Statements of Income.

Regulatory Assets and Liabiliti

Regulatory Assets and Liabilities	3 Months Ended
	Mar. 31, 2018
Regulatory Assets And Liabilities Disclosure [Abstract]
Regulatory Assets and Liabilities	Note 12. Regulatory Assets and Liabilities Regulatory assets and liabilities include the following: March 31, 2018 December 31, 2017 (millions) Dominion Energy Regulatory assets: Deferred rate adjustment clause costs (1) $ 78 $ 70 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Unrecovered gas costs (4) 5 38 Other 107 109 Regulatory assets-current (5) 263 294 Unrecognized pension and other postretirement benefit costs (6) 1,316 1,336 Deferred rate adjustment clause costs (1) 357 401 Deferred cost of fuel used in electric generation (3) 322 — PJM transmission rates (7) 229 222 Utility reform legislation (8) 160 147 Derivatives (9) 157 223 Other 157 151 Regulatory assets-noncurrent 2,698 2,480 Total regulatory assets $ 2,961 $ 2,774 Regulatory liabilities: Reserve for rate credits to electric utility customers (10) $ 200 $ — Provision for future cost of removal and AROs (11) 101 101 PIPP (12) 9 20 Other 98 72 Regulatory liabilities-current (13) 408 193 Income taxes refundable through future rates (14) 4,047 4,058 Provision for future cost of removal and AROs (11) 1,395 1,384 Nuclear decommissioning trust (15) 1,113 1,121 Cost-of-service impact of 2017 Tax Reform Act (16) 56 — Other 366 353 Regulatory liabilities-noncurrent 6,977 6,916 Total regulatory liabilities $ 7,385 $ 7,109 Virginia Power Regulatory assets: Deferred rate adjustment clause costs (1) $ 75 $ 56 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Other 76 72 Regulatory assets-current (5) 224 205 Deferred cost of fuel used in electric generation (3) 322 — Deferred rate adjustment clause costs (1) 255 312 PJM transmission rates (7) 229 222 Derivatives (9) 124 190 Other 79 86 Regulatory assets-noncurrent 1,009 810 Total regulatory assets $ 1,233 $ 1,015 Regulatory liabilities: Reserve for rate credits to customers (10) $ 200 $ — Provision for future cost of removal (11) 80 80 Deferred cost of fuel used in electric generation (3) 4 8 Other 20 39 Regulatory liabilities-current 304 127 Income taxes refundable through future rates (14) 2,575 2,581 Nuclear decommissioning trust (15) 1,113 1,121 Provision for future cost of removal (11) 922 915 Derivatives (9) 63 69 Cost-of-service impact of 2017 Tax Reform Act (16) 39 — Other 84 74 Regulatory liabilities-noncurrent 4,796 4,760 Total regulatory liabilities $ 5,100 $ 4,887 Dominion Energy Gas Regulatory assets: Deferred rate adjustment clause costs (1) $ 3 $ 14 Unrecovered gas costs (4) — 8 Other 3 4 Regulatory assets-current (5) 6 26 Unrecognized pension and other postretirement benefit costs (6) 255 258 Utility reform legislation (8) 160 147 Deferred rate adjustment clause costs (1) 102 89 Other 23 17 Regulatory assets-noncurrent (17) 540 511 Total regulatory assets $ 546 $ 537 Regulatory liabilities: Provision for future cost of removal and AROs (11) $ 13 $ 13 PIPP (12) 9 20 Other 20 5 Regulatory liabilities-current (13) 42 38 Income taxes refundable through future rates (14) 995 998 Provision for future cost of removal and AROs (15) 161 160 Cost-of-service impact of 2017 Tax Reform Act (16) 9 — Other 78 69 Regulatory liabilities-noncurrent (18) 1,243 1,227 Total regulatory liabilities $ 1,285 $ 1,265 (1) Primarily reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power and deferrals of costs associated with certain current and prospective rider projects for Dominion Energy Gas. See Note 13 for more information. (2) 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. (3) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion Energy's and Virginia Power's generation operations. (4) Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority. (5) Current regulatory assets are presented in other current assets in the Companies’ Consolidated Balance Sheets. (6) 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 and Dominion Energy Gas' rate-regulated subsidiaries. (7) Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more information. (8) Ohio legislation under House Bill 95, which became effective in September 2011. This law updates natural gas legislation by enabling gas companies to include more up-to-date cost levels when filing rate cases. It also allows gas companies to seek approval of capital expenditure plans under which gas companies can recognize carrying costs on associated capital investments placed in service and can defer the carrying costs plus depreciation and property tax expenses for recovery from ratepayers in the future. (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) Charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers. See Note 13 for more information. (11) Rates charged to customers by the Companies' 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. (12) Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions. (13) Current regulatory liabilities are presented in other current liabilities in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets. (14) 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. (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) 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 Note 13 for more information. (17) Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets. (18) Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets. At March 31, 2018, $382 million of Dominion Energy's and $304 million of Virginia Power's regulatory assets represented past expenditures on which they do not currently earn a return. With the exception of the $229 million PJM transmission cost allocation matter, the majority of these expenditures are expected to be recovered within the next two years.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2018
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 matters for which the Companies cannot estimate a range of possible loss, 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 for which the Companies are able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Any estimated range is based on currently available information, involves elements of judgment and significant uncertainties and may not represent the Companies’ maximum possible loss exposure. The circumstances of such regulatory matters will change from time to time and actual results may vary significantly from the current estimate. For current matters not specifically reported below, management does not anticipate that the outcome from such matters would have a material effect on the Companies’ financial position, liquidity or results of operations. FERC - Electric Under the Federal Power Act, FERC regulates wholesale sales and transmission of electricity in interstate commerce by public utilities. Dominion Energy’s merchant generators sell electricity in the PJM, CAISO and ISO-NE wholesale markets, and to wholesale purchasers in the states of Virginia, North Carolina, Indiana, Connecticut, Tennessee, Georgia, California, South Carolina and Utah, under Dominion Energy’s market-based sales tariffs authorized by FERC or pursuant to FERC authority to sell as a qualified facility. Virginia Power purchases and, under its FERC market-based rate authority, sells electricity in the wholesale market. In addition, Virginia Power has FERC approval of a tariff to sell wholesale power at capped rates based on its embedded cost of generation. This cost-based sales tariff could be used to sell to loads within or outside Virginia Power’s service territory. Any such sales would be voluntary. Rates In April 2008, FERC granted an application for Virginia Power’s electric transmission operations to establish a forward-looking formula rate mechanism that updates transmission rates on an annual basis and approved an ROE of 11.4%, effective as of January 1, 2008. The formula rate is designed to recover the expected revenue requirement for each calendar year and is updated based on actual costs. The FERC-approved formula method, which is based on projected costs, allows Virginia Power to earn a current return on its growing investment in electric transmission infrastructure. In March 2010, Old Dominion Electric Cooperative and North Carolina Electric Membership Corporation filed a complaint with FERC against Virginia Power claiming, among other issues, that the incremental costs of undergrounding certain transmission line projects were unjust, unreasonable and unduly discriminatory or preferential and should be excluded from Virginia Power’s transmission formula rate. A settlement of the other issues raised in the complaint was approved by FERC in May 2012. In March 2014, FERC issued an order excluding from Virginia Power’s transmission rates for wholesale transmission customers located outside Virginia the incremental costs of undergrounding certain transmission line projects. FERC found it is not just and reasonable for non-Virginia wholesale transmission customers to be allocated the incremental costs of undergrounding the facilities because the projects are a direct result of Virginia legislation and Virginia Commission pilot programs intended to benefit the citizens of Virginia. The order is retroactively effective as of March 2010 and will cause the reallocation of the costs charged to wholesale transmission customers with loads outside Virginia to wholesale transmission customers with loads in Virginia. FERC determined that there was not sufficient evidence on the record to determine the magnitude of the underground increment and held a hearing to determine the appropriate amount of undergrounding cost to be allocated to each wholesale transmission customer in Virginia. In October 2017, FERC issued an order determining the calculation of the incremental costs of undergrounding the transmission projects and affirming that the costs are to be recovered from the wholesale transmission customers with loads located in Virginia. FERC directed Virginia Power to rebill all wholesale transmission customers retroactively to March 2010 within 30 days of when the proceeding becomes final and no longer subject to rehearing. In November 2017, Virginia Power, North Carolina Electric Membership Corporation and the wholesale transmission customers filed petitions for rehearing. While Virginia Power cannot predict the outcome of the matter, it is not expected to have a material effect on results of operations. PJM Transmission Rates In April 2007, FERC issued an order regarding its transmission rate design for the allocation of costs among PJM transmission customers, including Virginia Power, for transmission service provided by PJM. For new PJM-planned transmission facilities that operate at or above 500 kV, FERC established a PJM regional rate design where customers pay according to each customer’s share of the region’s load. For recovery of costs of existing facilities, FERC approved the existing methodology whereby a customer pays the cost of facilities located in the same zone as the customer. A number of parties appealed the order to the U.S. Court of Appeals for the Seventh Circuit. In August 2009, the court issued its decision affirming the FERC order with regard to the existing facilities, but remanded to FERC the issue of the cost allocation associated with the new facilities 500 kV and above for further consideration by FERC. On remand, FERC reaffirmed its earlier decision to allocate the costs of new facilities 500 kV and above according to the customer’s share of the region’s load. A number of parties filed appeals of the order to the U.S. Court of Appeals for the Seventh Circuit. In June 2014, the court again remanded the cost allocation issue to FERC. In December 2014, FERC issued an order setting an evidentiary hearing and settlement proceeding regarding the cost allocation issue. The hearing only concerns the costs of new facilities approved by PJM prior to February 1, 2013. Transmission facilities approved after February 1, 2013 are allocated on a hybrid cost allocation method approved by FERC and not subject to any court review. In June 2016, PJM, the PJM transmission owners and state commissions representing substantially all of the load in the PJM market submitted a settlement to FERC to resolve the outstanding issues regarding this matter. Under the terms of the settlement, Virginia Power would be required to pay approximately $200 million to PJM over the next 10 years. Although the settlement agreement has not been accepted by FERC, and the settlement is opposed by a small group of parties to the proceeding, Virginia Power believes it is probable it will be required to make payment as an outcome of the settlement. Accordingly, as of March 31, 2018, Virginia Power has recorded a contingent liability of $239 million in other deferred credits and other liabilities, which is offset by a $229 million regulatory asset for the amount that will be recovered through retail rates in Virginia. FERC – Gas DETI In July 2017, FERC audit staff communicated to DETI that it had substantially completed an audit of DETI’s compliance with the accounting and reporting requirements of FERC’s Uniform System of Accounts and provided a description of matters and preliminary recommendations. In November 2017, the FERC audit staff issued its audit report, which could have the potential to result in adjustments which could be material to Dominion Energy’s and Dominion Energy Gas’ results of operations. In December 2017, DETI provided its response to the audit report. DETI requested FERC review of contested findings and submitted its plan for compliance with the uncontested portions of the report. In connection with one uncontested issue, DETI recognized a charge of $15 million ($9 million after-tax) recorded within other operations and maintenance expense in Dominion Energy’s and Dominion Energy Gas’ Consolidated Statements of Income during 2017 to write-off the balance of a regulatory asset, originally established in 2008, that is no longer considered probable of recovery. Pending final resolution of the audit process and a determination by FERC, management is unable to estimate the potential impact of the other findings and no amounts have been recognized. 2017 Tax Reform Act Subsequent to the enactment of the 2017 Tax Reform Act, the Companies’ state regulators issued orders requesting that public utilities evaluate the total tax impact on the entity’s cost of service and accrue a regulatory liability attributable to the benefits of the reduction in the corporate income tax rate. Certain of the orders requested that the public utilities submit a response to the state regulatory commissions detailing the total tax impact on the utility’s cost of service. Virginia Power submitted a response to the North Carolina Utilities Commission detailing the impact of the 2017 Tax Reform Act on base non-fuel cost of service and Virginia Power’s excess deferred income taxes clarifying that the amounts have been deferred to a regulatory liability. The Virginia Commission directed Virginia Power to submit a compliance filing in May 2018 detailing the implementation plan for rate reductions attributable to reductions in the corporate income tax obligations pursuant to the 2017 Tax Reform Act. Questar Gas submitted a response to the Utah Commission and Wyoming Public Service Commission detailing the impact of the 2017 Tax Reform Act on base rates and the infrastructure rider, and proposing that the benefits be passed back to customers. East Ohio submitted responses to the Ohio Commission’s request for comments on those components of utility rates that will need to be reconciled with the 2017 Tax Reform Act, and on the process and mechanics by which the Ohio Commission should do so. The Public Service Commission of West Virginia directed Hope to utilize regulatory accounting to track the effects of the 2017 Tax Reform Act beginning January 2018 and to submit pre-filed testimony in May 2018 detailing such effects. These filings are pending. Dominion Energy plans to respond to the remaining state regulatory commissions in accordance with the due dates on the issued orders. The Companies began to reserve the impacts of the cost-of-service reduction as a regulatory liability beginning in 2018 until the rates are reset. The Companies have recorded a reasonable estimate of net income taxes refundable through future rates in the jurisdictions in which they operate and are currently assessing these actions and decisions, which could have a material impact on the Companies’ results of operations, financial condition and/or cash flows. In March 2018, FERC announced actions to address the income tax allowance component of regulated entities’ cost-of-service rates as a result of the 2017 Tax Reform Act. FERC issued a notice of proposed rulemaking introducing a process for determining whether jurisdictional natural gas pipelines may be collecting unjust and unreasonable rates as a result of the reduction in the corporate income tax rate. The proposed rule would require all interstate natural gas pipelines to make a one-time informational filing with FERC to provide financial information to allow FERC and other interested parties to analyze the impacts of the changes in tax law. The actions also included the reversal of FERC’s policy allowing master limited partnerships to recover an income tax allowance in cost-of-service rates and requiring other pass-through entities to justify the inclusion of an income tax allowance. FERC also issued a notice of inquiry seeking comments on whether it should take any additional actions to address changes in federal corporate income taxes, the elimination of an income tax allowance for master limited partnerships, excess or deficient accumulated deferred income taxes and bonus depreciation, among other items. Given these developments and associated uncertainty, Dominion Energy and Dominion Energy Gas are currently unable to predict the outcome of these matters; however, any change in rates permitted to be charged to customers could have a material impact on results of operations, financial condition and/or cash flows. Virginia Power’s regulated electric transmission formula rate mechanism includes provisions allowing changes in income tax rates to be incorporated in rates charged to customers. 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, 2017. Virginia Regulation Grid Transformation and Security Act of 2018 In March 2018, the Governor of Virginia signed into law legislation to reinstate base rate reviews on a triennial basis other than the first review, which will be a quadrennial review, occurring for Virginia Power in 2021 for the four successive 12-month test periods beginning January 1, 2017 and ending December 31, 2020. This review for Virginia Power will occur one year earlier than under the Regulation Act legislation enacted in February 2015. In the triennial review proceedings, earnings that are more than 70 basis points above the utility’s authorized return on equity that might have been refunded to customers may be reduced by approved investment amounts in qualifying solar or wind generation facilities or electric distribution grid transformation projects that Virginia Power elects to include in a customer credit reinvestment offset. The legislation declares that electric distribution grid transformation projects are in the public interest and provides that the costs of such projects may be recovered through a rate adjustment clause if not the subject of a customer credit reinvestment offset. Any costs that are the subject of a customer credit reinvestment offset may not be recovered in base rates for the service life of the projects and may not be included in base rates in future triennial review proceedings. The legislation also includes provisions requiring Virginia Power to provide current customers one-time rate credits totaling $200 million and to reduce base rates to reflect reductions in income tax expense resulting from the 2017 Tax Reform Act. As a result, Virginia Power incurred a $215 million ($160 million after-tax) charge in connection with this legislation, including the impact on certain non-jurisdictional customers which follow Virginia Power’s jurisdictional customer rate methodology. In addition, Virginia Power will reduce base rates on an annual basis by $125 million effective July 2018, to reflect the estimated effect of the 2017 Tax Reform Act, which is subject to adjustment in April 2019. Rate Adjustment Clauses Below is a discussion of significant riders associated with various Virginia Power projects: • The Virginia Commission previously approved Rider B in conjunction with the conversion of three power stations to biomass. In February 2018, the Virginia Commission approved a $47 million revenue requirement based on updated revenue requirement projections and using an established 11.2% ROE for the rate year beginning April 1, 2018, subject to true-up. Public notice required by the Virginia Commission in connection with the proceeding reflected the originally proposed $42 million revenue requirement; therefore, in approving the updated $47 million revenue requirement, the Virginia Commission ordered that recovery from customers be limited to $42 million during the rate year beginning April 1, 2018, with any unrecovered amounts subject to true-up in future annual update proceedings. • 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 March 2018, Virginia Power requested approval of its third phase of conversions totaling $179 million and a balance of $65 million in second phase conversions not previously approved for recovery through Rider U. Virginia Power also proposed a total $73 million revenue requirement for the rate year beginning February 1, 2019 for continuing recovery of the previously approved first and second phase conversions and the proposed second and third phase conversions. This case is pending. Electric Transmission Projects Virginia Power previously filed an application with the Virginia Commission for a CPCN to convert an existing transmission line to 230 kV in Prince William County, Virginia, and Loudoun County, Virginia, and to construct and operate a new approximately five mile overhead 230 kV double circuit transmission line between a tap point near the Gainesville substation and a new to-be-constructed Haymarket substation. In June 2017, the Virginia Commission issued a final order approving an alternative route for the project, and granted the necessary CPCN. In July 2017, the Virginia Commission retained jurisdiction over the case to evaluate two requests to reconsider its decisions. Also in July 2017, Virginia Power requested that the Virginia Commission stay the proceeding while Virginia Power discussed the proposed route with leaders of Prince William County. In December 2017, the Virginia Commission granted in part the two motions for reconsideration, retained jurisdiction for further proceedings in the case and stayed the effectiveness of its final order. In March 2018, Virginia Power and the two parties seeking reconsideration entered into a stipulated settlement filed with the Virginia Commission agreeing that the project should be placed into an underground pilot program created by the Grid Transformation and Security Act of 2018. This matter is pending. Ohio Regulation PIR Program In 2008, East Ohio began PIR, aimed at replacing approximately 25% of its pipeline system. In April 2018, the Ohio Commission approved East Ohio’s application to adjust the PIR cost recovery rates for 2017 costs. The filing reflects gross plant investment for 2017 of $204 million, cumulative gross plant investment of $1.4 billion and a revenue requirement of $165 million. AMR Program In 2007, East Ohio began installing automated meter reading technology for its 1.2 million customers in Ohio. In April 2018, the Ohio Commission approved East Ohio’s application to adjust the AMR cost recovery rate for 2017 costs. The filing reflects a revenue requirement of approximately $5 million.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 14. Variable Interest Entities There have been no significant changes regarding the entities the Companies consider VIEs 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, 2017. Dominion Energy Dominion Energy’s securities due within one year and long-term debt include $30 million and $332 million, respectively, of debt issued in 2016 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 merchant solar facilities. Virginia Power Virginia Power had long-term power and capacity contracts with three non-utility generators. Contracts with two of these non-utility generators expired in the third quarter 2017 leaving a remaining aggregate summer generation capacity of approximately 218 MW. Virginia Power is not subject to any risk of loss from this potential VIE other than its remaining purchase commitments which totaled $188 million as of March 31, 2018. Virginia Power paid $13 million and $28 million for electric capacity and $5 million and $8 million for electric energy to non-utility generators in the three months ended March 31, 2018 and 2017, respectively. Virginia Power and Dominion Energy Gas Virginia Power and Dominion Energy Gas purchased shared services from DES, an affiliated VIE, of $89 million and $32 million for the three months ended March 31, 2018, and $85 million and $31 million for the three months ended March 31, 2017, respectively. Virginia Power and Dominion Energy Gas’ Consolidated Balance Sheets included amounts due to DES of $43 million and $11 million, respectively, at March 31, 2018, and $36 million and $14 million, respectively, at December 31, 2017, recorded in payables to affiliates in the Consolidated Balance Sheets.

Significant Financing Transacti

Significant Financing Transactions	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Significant Financing Transactions	Note 15. 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 March 2018, Dominion Energy replaced its two existing joint revolving credit facilities with a $6.0 billion joint revolving credit facility. At March 31, 2018, 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 $ 2,712 $ 72 $ 3,216 (1) This credit facility matures in March 2023 and can be used by the Companies 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. Questar Gas’ short-term financing is supported through its access as co-borrower to the joint revolving credit facility discussed above with Dominion Energy, Virginia Power and Dominion Energy Gas. At March 31, 2018, the sub-limit for Questar Gas was $250 million. In addition to the credit facility mentioned above, SBL Holdco has $30 million of credit facilities which have an original stated maturity date of December 2017 with automatic one-year renewals through the maturity of the SBL Holdco term loan agreement in 2023. Dominion Solar Projects III, Inc. has $25 million of credit facilities which have an original stated maturity date of May 2018 with automatic one-year renewals through the maturity of the Dominion Solar Projects III, Inc. term loan agreement in 2024. At March 31, 2018, no amounts were outstanding under either of these facilities. In February 2018, Dominion Energy borrowed $950 million under a 364-Day Term Loan Agreement that bears interest at a variable rate. In addition, the agreement contains a maximum allowed total debt to total capital ratio of 67.5%. In March 2018, Dominion Energy Midstream entered into a $500 million revolving credit facility. The credit facility matures in March 2021, bears interest at a variable rate, and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $250 million of letters of credit. There were no amounts outstanding on this credit facility at March 31, 2018. At May 3, 2018, Dominion Energy Midstream had $73 million outstanding on this credit facility. Virginia Power Virginia Power’s short-term financing is supported through its access as co-borrower to the joint revolving credit facility. This credit facility can be used for working capital, as support for the combined commercial paper programs of the Companies and for other general corporate purposes. At March 31, 2018, Virginia Power’s share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Dominion Energy Gas and Questar Gas was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 6,000 $ 426 $ 1 (1) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit. In addition to the credit facility commitments mentioned above, Virginia Power also had a $100 million credit facility with a maturity date of April 2020. In March 2018, Virginia Power redeemed its variable rate tax-exempt financings supported by this credit facility and terminated the facility. Dominion Energy Gas Dominion Energy Gas’ short-term financing is supported through its access as co-borrower to the joint revolving credit facility. This credit facility can be used for working capital, as support for the combined commercial paper programs of the Companies and for other general corporate purposes. At March 31, 2018, Dominion Energy Gas' share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Virginia Power and Questar Gas was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 1,500 $ 614 $ — (1) A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At Long-term Debt In January 2018, Dominion Energy Questar Pipeline issued, through private placement, $100 million of 3.53% senior notes and $150 million of 3.91% senior notes that mature in 2028 and 2038, respectively. In March 2018, Virginia Power issued $700 million of 3.80% senior notes that mature in 2028. In March 2018, Virginia Power redeemed $100 million of its variable rate tax-exempt financings which would otherwise have matured in 2024, 2026 and 2027. In April 2018, Questar Gas issued through private placement $50 million of 3.30% senior notes and $100 million of 3.97% senior notes that mature in 2030 and 2047, respectively. Issuance of Common Stock At-the-Market Programs In June 2017, Dominion Energy filed an SEC shelf registration statement for the sale of debt and equity securities including the ability to sell common stock through an at-the-market program. Also, in June 2017, Dominion Energy entered into three separate sales agency agreements to effect sales under the program and pursuant to which it was able to offer up to $500 million aggregate amount of its common stock. In January 2018, Dominion Energy provided sales instructions to one of the sales agents and issued 6.6 million shares through at-the-market issuances and received cash proceeds of $495 million, net of fees and commissions paid of $5 million. Following these issuances, Dominion Energy had no remaining ability to issue stock under the 2017 sales agency agreements and completed the program. In February 2018, Dominion Energy entered into six separate sales agency agreements to effect sales under a new at-the-market program pursuant to which it may offer from time to time up to $1.0 billion aggregate amount of its common stock. These agreements replace the sales agency agreements entered into by Dominion Energy in June 2017. Sales of common stock can be made by means of privately negotiated transactions, as transactions on the New York Stock Exchange at market prices or in such other transactions as are agreed upon by Dominion Energy and the sales agents in conformance with applicable securities laws. No issuances have occurred under these agreements and none are planned in 2018. Forward Sales Agreements Dominion Energy entered in March 2018, and closed in April 2018, separate forward sale agreements with Goldman Sachs & Co. LLC and Credit Suisse Capital LLC, as forward purchasers, and an underwriting agreement with Credit Suisse Securities (USA) LLC and Goldman Sachs & Co. LLC, as representatives of the several underwriters named therein, relating to an aggregate of 20 million shares of Dominion Energy common stock. The underwriting agreement granted the underwriters a 30-day option to purchase up to an additional three million shares of Dominion Energy common stock, which the underwriters exercised with respect to approximately 2.1 million shares in April 2018. Dominion Energy entered into separate forward sale agreements with the forward purchasers with respect to the additional shares. Except in certain specified circumstances that would require physical share settlement, Dominion Energy may elect physical, cash or net share settlement of the forward sale agreements on or before December 31, 2018. At the initial forward sale price of approximately $67.33 per share, Dominion Energy expects the net proceeds from full physical settlement of the forward sales agreements to be approximately $1.5 billion (after deducting underwriting discounts, but before deducting expenses, and subject to forward price adjustments under the forward sale agreements). Pursuant to a cash settlement of the forward sale agreements, Dominion Energy would expect to receive an amount of net proceeds that is significantly lower than estimated above in connection with the full physical settlement, and Dominion Energy may not receive any net proceeds (or may owe cash, which could be a significant amount, to the forward purchasers). If the forward sale agreements are net share settled in full, Dominion Energy would not receive any cash proceeds from the forward purchasers (and may be required to deliver shares of our common stock to the forward purchasers). The forward sale transactions will be classified as equity transactions, because they are indexed to Dominion Energy’s common stock and physical settlement is within Dominion Energy’s control.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16. 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 for which the Companies cannot estimate a range of possible loss, 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 for which 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 financial position, liquidity or results of operations of the Companies. Environmental Matters The Companies are subject to costs resulting from a number of federal, state and local laws and regulations designed to protect human health and the environment. These laws and regulations affect future planning and existing operations. They can result in increased capital, operating and other costs as a result of compliance, remediation, containment and monitoring obligations. Air CAA The CAA, as amended, is a comprehensive program utilizing a broad range of regulatory tools to protect and preserve the nation's air quality. At a minimum, states are required to establish regulatory programs to address all requirements of the CAA. However, states may choose to develop regulatory programs that are more restrictive. Many of the Companies' facilities are subject to the CAA's permitting and other requirements. MATS The MATS rule requires coal- and oil-fired electric utility steam generating units to meet strict emission limits for mercury, particulate matter as a surrogate for toxic metals and hydrogen chloride as a surrogate for acid gases. Following a one-year compliance extension granted by VDEQ and an additional one-year extension under an EPA Administrative Order, Virginia Power ceased operating the coal units at Yorktown power station in April 2017 to comply with the rule. In June 2017, the DOE issued an order to PJM to direct Virginia Power to operate Yorktown power station’s Units 1 and 2 as needed to avoid reliability issues on the Virginia Peninsula. The order was effective for 90 days and can be reissued upon PJM’s request, if necessary, until required electricity transmission upgrades are completed approximately 23 months following the receipt in July 2017 of final permits and approvals for construction. Beginning in August 2017, PJM filed requests for 90-day renewals of the DOE order, which the DOE has granted. The current renewal is effective until June 2018. The Sierra Club has challenged the DOE order and certain renewal requests, all of which have been denied by the DOE. Although litigation of the MATS rule is still pending, the regulation remains in effect and Virginia Power is complying with the applicable requirements of the rule and does not expect any adverse impacts to its operations at this time. Ozone Standards In October 2015, the EPA issued a final rule tightening the ozone standard from 75-ppb to 70-ppb. To comply with this standard, in April 2016 Virginia Power submitted the NO X X X X The statutory deadline for the EPA to complete attainment designations for a new standard was October 2017. States will have three years after final designations, certain of which were issued by the EPA in November 2017, 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. NO X In April 2016, the Pennsylvania Department of Environmental Protection issued final regulations, with an effective date of January 2017, to reduce NO X Oil and Gas NSPS In August 2012, the EPA issued an NSPS impacting new and modified facilities in the natural gas production and gathering sectors and made revisions to the NSPS for natural gas processing and transmission facilities. These rules establish equipment performance specifications and emissions standards for control of VOC emissions for natural gas production wells, tanks, pneumatic controllers, and compressors in the upstream sector. In June 2016, the EPA issued a new NSPS regulation, for the oil and natural gas sector, to regulate methane and VOC emissions from new and modified facilities in transmission and storage, gathering and boosting, production and processing facilities. All projects which commenced construction after September 2015 are required to comply with this regulation. In April 2017, the EPA issued a notice that it is reviewing the rule and, if appropriate, will issue a rulemaking to suspend, revise or rescind the June 2016 final NSPS for certain oil and gas facilities. In June 2017, the EPA published notice of reconsideration and partial stay of the rule for 90 days and proposed extending the stay for two years. In July 2017, the U.S. Court of Appeals for the D.C. Circuit vacated the 90-day stay. In November 2017, the EPA solicited comments on the proposed two-year stay of the June 2016 NSPS rules. Dominion Energy and Dominion Energy Gas are implementing the 2016 regulation. Dominion Energy and Dominion Energy Gas are still evaluating whether potential impacts on results of operations, financial condition and/or cash flows related to this matter will be material. GHG Regulation 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 to set a significant emissions rate at 75,000 tons per year of CO 2 In addition, the EPA continues to evaluate its policy regarding the consideration of CO 2 Methane Emissions In July 2015, the EPA announced the next generation of its voluntary Natural Gas STAR Program, the Natural Gas STAR Methane Challenge Program. The program covers the entire natural gas sector from production to distribution, with more emphasis on transparency and increased reporting for both annual emissions and reductions achieved through implementation measures. In March 2016, East Ohio, Hope, DETI and Questar Gas joined the EPA as founding partners in the new Methane Challenge program and submitted implementation plans in September 2016. DECG joined the EPA’s voluntary Natural Gas STAR Program in July 2016 and submitted an implementation plan in September 2016. Dominion Energy and Dominion Energy Gas do not expect the costs related to these programs to have a material impact on 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. 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 have 13 and 11 facilities, respectively, that may be subject to the final regulations. Dominion Energy anticipates that it will have to install impingement control technologies at many of these stations that have once-through cooling systems. Dominion Energy and Virginia Power 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. While the impacts of this rule could be material to Dominion Energy’s and Virginia Power’s results of operations, financial condition and/or cash flows, the existing regulatory framework in Virginia provides rate recovery mechanisms that could substantially mitigate any such impacts for Virginia Power. In September 2015, the EPA released a final rule to revise the Effluent Limitations Guidelines for the Steam Electric Power Generating Category. The final rule establishes updated standards for wastewater discharges that apply primarily at coal and oil steam generating stations. Affected facilities are required to convert from wet to dry or closed cycle coal ash management, improve existing wastewater treatment systems and/or install new wastewater treatment technologies in order to meet the new discharge limits. Virginia Power has eight facilities subject to the final rule. 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 U.S.’s request for a stay of the pending consolidated litigation challenging the rule while the EPA addresses the petitions for reconsideration. In September 2017, the EPA signed a rule to postpone the earliest compliance dates for certain waste streams regulations in the Effluent Limitations Guidelines final rule from November 2018 to November 2020; however, the latest date for compliance for these regulations remains December 2023. The EPA is proposing to complete new rulemaking for these waste streams. While the impacts of this rule could be material to Dominion Energy’s and Virginia Power’s results of operations, financial condition and/or cash flows, the existing regulatory framework in Virginia provides rate recovery mechanisms that could substantially mitigate any such impacts for Virginia Power. Waste Management and Remediation The CERCLA, as amended, provides for immediate response and removal actions coordinated by the EPA in the event of threatened releases of hazardous substances into the environment and authorizes the U.S. government either to clean up sites at which hazardous substances have created actual or potential environmental hazards or to order persons responsible for the situation to do so. Under the CERCLA, as amended, generators and transporters of hazardous substances, as well as past and present owners and operators of contaminated sites, can be jointly, severally and strictly liable for the cost of cleanup. These potentially responsible parties can be ordered to perform a cleanup, be sued for costs associated with an EPA-directed cleanup, voluntarily settle with the U.S. government concerning their liability for cleanup costs, or voluntarily begin a site investigation and site remediation under state oversight. From time to time, Dominion Energy, Virginia Power, or Dominion Energy Gas may be identified as a potentially responsible party to a Superfund site. The EPA (or a state) can either allow such a party to conduct and pay for a remedial investigation, feasibility study and remedial action or conduct the remedial investigation and action itself and then seek reimbursement from the potentially responsible parties. These parties can also bring contribution actions against each other and seek reimbursement from their insurance companies. As a result, Dominion Energy, Virginia Power, or Dominion Energy Gas may be responsible for the costs of remedial investigation and actions under the Superfund law or other laws or regulations regarding the remediation of waste. 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 19 former manufactured gas plant sites, three of which pertain to Virginia Power and 12 of which pertain to Dominion Energy Gas. Studies conducted by other utilities at their former manufactured gas plant sites have indicated that those sites contain coal tar and other potentially harmful materials. None of the former sites with which the Companies are associated is under investigation by any state or federal environmental agency. At one of the former sites, Dominion Energy is conducting a state-approved post closure groundwater monitoring program and an environmental land use restriction has been recorded. Another site has been accepted into a state-based voluntary remediation program. Virginia Power is currently evaluating the nature and extent of the contamination from this site as well as potential remedial options. Preliminary costs for options under evaluation for the site range from $1 million to $22 million. Due to the uncertainty surrounding the other sites, the Companies are unable to make an estimate of the potential financial statement impacts. See below for discussion on ash pond and landfill closure costs. 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. Appalachian Gateway Pipeline Contractor Litigation Following the completion of the Appalachian Gateway project in 2012, DETI received multiple change order requests and other claims for additional payments from a pipeline contractor for the project. In July 2015, the contractor filed a complaint against DETI in U.S. District Court for the Western District of Pennsylvania. In March 2016, the Pennsylvania court granted DETI’s motion to transfer the case to the U.S. District Court for the Eastern District of Virginia. In July 2016, DETI filed a motion to dismiss. In March 2017, the court dismissed three of eight counts in the complaint. In May 2017, the contractor withdrew one of the counts in the complaint. In November 2017, DETI and the contractor entered into a partial settlement agreement for a release of certain claims. This case is pending. At March 31, 2018, DETI has accrued a liability of $7 million for this matter. Dominion Energy Gas cannot currently estimate additional financial statement impacts, but there could be a material impact to its financial condition and/or cash flows. Gas Producers Litigation In connection with the Appalachian Gateway project, Dominion Energy Field Services, Inc. entered into contracts for firm purchase rights with a group of small gas producers. In June 2016, the gas producers filed a complaint in the Circuit Court of Marshall County, West Virginia against Dominion Energy, DETI and Dominion Energy Field Services, Inc., among other defendants, claiming that the contracts are unenforceable and seeking compensatory and punitive damages. During the third quarter of 2016, Dominion Energy, DETI and Dominion Energy Field Services, Inc. were served with the complaint. Also in the third quarter of 2016, Dominion Energy and DETI, with the consent of the other defendants, removed the case to the U.S. District Court for the Northern District of West Virginia. In October 2016, the defendants filed a motion to dismiss and the plaintiffs filed a motion to remand. In February 2017, the U.S. District Court entered an order remanding the matter to the Circuit Court of Marshall County, West Virginia. In March 2017, Dominion Energy was voluntarily dismissed from the case; however, DETI and Dominion Energy Field Services, Inc. remain parties to the matter. In April 2017, the case was transferred to the Business Court Division of West Virginia. In January 2018, the court granted the motion to dismiss filed by the defendants on two counts. All other claims are pending in the Business Court Division of West Virginia. Dominion Energy and Dominion Energy Gas cannot currently estimate financial statement impacts, but there could be a material impact to their financial condition and/or cash flows. Ash Pond and Landfill Closure Costs In March 2015, the Sierra Club filed a lawsuit alleging CWA violations at Chesapeake power station. In March 2017, the U.S. District Court for the Eastern District of Virginia ruled that impacted groundwater associated with the on-site coal ash storage units was migrating to adjacent surface water, which constituted an unpermitted point source discharge in violation of the CWA. The court, however, rejected Sierra Club’s claims that Virginia Power had violated specific conditions of its water discharge permit. Finding no harm to the environment, the court further declined to impose civil penalties or require excavation of the ash from the site as Sierra Club had sought. In July 2017, the court issued a final order requiring Virginia Power to perform additional specific sediment, water and aquatic life monitoring at and around the Chesapeake power station for a period of at least two years. The court further directed Virginia Power to apply for a solid waste permit from VDEQ that includes corrective measures to address on-site groundwater impacts. In July 2017, Virginia Power appealed the court’s July 2017 final order to the U.S. Court of Appeals for the Fourth Circuit. In August 2017, the Sierra Club filed a cross appeal. This case is pending. In April 2015, the EPA enacted a final rule regulating CCR landfills, existing ash ponds that still receive and manage CCRs, and inactive ash ponds that do not receive, but still store, CCRs. Virginia Power currently operates inactive ash ponds, existing ash ponds, and CCR landfills subject to the final rule at eight different facilities. This rule created a legal obligation for Virginia Power to retrofit or close all of its inactive and existing ash ponds over a certain period of time, as well as perform required monitoring, corrective action, and post-closure care activities as necessary. In December 2016, legislation was enacted that creates a framework for EPA-approved state CCR permit programs. In August 2017, the EPA issued interim guidance outlining the framework for state CCR program approval. The EPA has enforcement authority until state programs are approved. The EPA and states with approved programs both will have authority to enforce CCR requirements under their respective rules and programs. In September 2017, the EPA agreed to reconsider portions of the CCR rule in response to two petitions for reconsideration. Litigation concerning the CCR rule is pending and the EPA has submitted to the court a list of which CCR rule provisions the EPA intends to reevaluate. In March 2018, the EPA proposed certain changes to the CCR rule related to issues remanded as part of the pending litigation and other issues the EPA is reconsidering. Several of the proposed changes would allow states with approved CCR permit programs additional flexibilities in implementing their programs. Virginia Power cannot forecast potential incremental impacts or costs related to existing coal ash sites in connection with future implementation of the 2016 CCR legislation and reconsideration of the CCR rule. In April 2017, the Governor of Virginia signed legislation into law that places a moratorium on the VDEQ issuing solid waste permits for closure of ash ponds at Virginia Power’s Bremo, Chesapeake, Chesterfield and Possum Point power stations until May 2018. The law also requires Virginia Power to conduct an assessment of closure alternatives for the ash ponds at these four stations, to include an evaluation of excavation for recycling or off-site disposal, surface and groundwater conditions and safety. Virginia Power completed the assessments and provided the report on December 1, 2017. In April 2018, the Governor of Virginia signed legislation into law extending the existing permit moratorium until July 2019. The legislation also requires Virginia Power to solicit and compile by November 2018, information from third parties on the suitability, cost and market demand for beneficiation or recycling of coal ash from these units. The extended moratorium does not apply to a permit required for an impoundment where CCRs have already been removed and placed in another impoundment on-site, are being removed from an impoundment, or are being processed in connection with a recycling or beneficial use project. Virginia Power has estimated the potential financial impact of this legislation to be an approximately $100 million to $200 million increase in compliance costs, which will be recorded in the second quarter of 2018. The actual AROs related to the CCR rule may vary substantially from the estimates used to record the obligation. Cove Point In September 2014, FERC issued an order granting authorization for Cove Point to construct, modify and operate the Liquefaction Project at the Cove Point facility, which enables the facility to liquefy domestically-produced natural gas and export it as LNG. In March 2018, Cove Point received authorization from FERC to commence service of the Liquefaction Project, which commenced commercial operations in April 2018. Two parties have separately filed petitions for review of the FERC order in the U.S. Court of Appeals for the D.C. Circuit, which petitions were consolidated. Separately, one party requested a stay of the FERC order until the judicial proceedings are complete, which the court denied in June 2015. In July 2016, the court denied one party’s petition for review of the FERC order authorizing the Liquefaction Project. The court also issued a decision remanding the other party’s petition for review of the FERC order to FERC for further explanation of FERC’s decision that a previous transaction with an existing import shipper was not unduly discriminatory. In September 2017, FERC issued its order on remand from the U.S. Court of Appeals for the D.C. Circuit, and reaffirmed its ruling in its prior orders that Cove Point did not violate the prohibition against undue discrimination by agreeing to a capacity reduction and early contract termination with the existing import shipper. In October 2017, the party filed a request for rehearing of the FERC order on remand. This case is pending. In September 2013, the DOE granted Non-FTA Authorization approval for the export of up to 0.77 bcfe/day of natural gas to countries that do not have an FTA for trade in natural gas. In June 2016, a party filed a petition for review of this approval in the U.S. Court of Appeals for the D.C. Circuit. In November 2017, the U.S. Court of Appeals for the D.C. Circuit issued an order denying the petition for review. FERC FERC staff in the Office of Enforcement, Division of Investigations, is conducting a non-public investigation of Virginia Power's offers of combustion turbines generators into the PJM day-ahead markets from April 2010 through September 2014. FERC staff notified Virginia Power of its preliminary findings relating to Virginia Power's alleged violation of FERC's rules in connection with these activities. Virginia Power has provided its response to FERC staff's preliminary findings letter explaining why Virginia Power's conduct was lawful and refuting any allegation of wrongdoing. Virginia Power is cooperating fully with the investigation; however, it cannot currently predict whether or to what extent it may incur a material liability. Nuclear Matters In March 2011, a magnitude 9.0 earthquake and subsequent tsunami caused significant damage at the Fukushima Daiichi nuclear power station in northeast Japan. These events have resulted in significant nuclear safety reviews required by the NRC and industry groups such as the Institute of Nuclear Power Operations. Like other U.S. nuclear operators, Dominion Energy has been gathering supporting data and participating in industry initiatives focused on the ability to respond to and mitigate the consequences of design-basis and beyond-design-basis events at its stations. In July 2011, an NRC task force provided initial recommendations based on its review of the Fukushima Daiichi accident and in October 2011 the NRC staff prioritized these recommendations into Tiers 1, 2 and 3, with the Tier 1 recommendations consisting of actions which the staff determined should be started without unnecessary delay. In December 2011, the NRC Commissioners approved the agency staff's prioritization and recommendations, and that same month an appropriations act directed the NRC to require reevaluation of external hazards (not limited to seismic and flooding hazards) as soon as possible. Based on the prioritized recommendations, in March 2012, the NRC issued orders and information requests requiring specific reviews and actions to all operating reactors, construction permit holders and combined license holders based on the lessons learned from the Fukushima Daiichi event. The orders applicable to Dominion Energy requiring implementation of safety enhancements related to mitigation strategies to respond to extreme natural events resulting in the loss of power at plants, and enhancing spent fuel pool instrumentation have been implemented. The information requests issued by the NRC request each reactor to reevaluate the seismic and external flooding hazards at their site using present-day methods and information, conduct walkdowns of their facilities to ensure protection against the hazards in their current design basis, and to reevaluate their emergency communications systems and staffing levels. The walkdowns of each unit have been completed, audited by the NRC and found to be adequate. Reevaluation of the emergency communications systems and staffing levels was completed as part of the effort to comply with the orders. Reevaluation of the seismic and external flooding hazards is expected to continue through 2018. Dominion Energy and Virginia Power do not currently expect that compliance with the NRC's information requests will materially impact their financial position, results of operations or cash flows during the implementation period. The NRC staff is evaluating the implementation of the longer-term Tier 2 and Tier 3 recommendations. Dominion Energy and Virginia Power do not expect material financial impacts related to compliance with Tier 2 and Tier 3 recommendations. Nuclear Operations In March 2015, the NRC granted an exemption to the Price-Anderson Amendments Act of 1988 which removed Kewaunee from the Secondary Financial Protection program. This same exemption permitted Dominion Energy to reduce Kewaunee’s required level of liability coverage and property insurance limit to $100 million and $50 million, respectively. Dominion Energy implemented these reductions in January 2018, following the removal and storage of the spent nuclear fuel from the spent fuel pool. Guarantees, Surety Bonds and Letters of Credit Dominion Energy In October 2017, Dominion Energy entered into a guarantee agreement to support a portion of Atlantic Coast Pipeline’s obligation under a $3.4 billion revolving credit facility, also entered in October 2017, with a stated maturity date of October 2021. Dominion Energy’s maximum potential loss exposure under the terms of the guarantee is limited to 48% of the outstanding borrowings under the revolving credit facility, an equal percentage to Dominion Energy’s ownership in Atlantic Coast Pipeline. As of March 31, 2018, Atlantic Coast Pipeline has borrowed $737 million against the revolving credit facility. Dominion Energy’s Consolidated Balance Sheets include a liability of $27 million associated with this guarantee agreement at March 31, 2018. In addition, at March 31, 2018, Dominion Energy had issued $48 million Dominion Energy also enters into guarantee arrangements on behalf of its consolidated subsidiaries, primarily to facilitate their commercial transactions with third parties. At March 31, 2018, Dominion Energy had issued the following subsidiary guarantees: Maximum Exposure (millions) Commodity transactions (1) $ 2,149 Nuclear obligations (2) 228 Cove Point (3) 1,900 Solar (4) 942 Other (5) 551 Total (6) $ 5,770 (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 related to certain DGI subsidiaries regarding all aspects of running a nuclear facility. (3) Guarantees related to Cove Point, in support of terminal services, transportation and construction. Cove Point has two guarantees that have no maximum limit and, therefore, are not included in this amount. (4) Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects. (5) Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of March 31, 2018, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $10 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $6 million. (6) Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2017. Additionally, at March 31, 2018, Dominion Energy had purchased $155 million of surety bonds, including $69 million at Virginia Power and $25 million at Dominion Energy Gas, and authorized the issuance of letters of credit by financial institutions of $72 million to facilitate commercial transactions by its subsidiaries with third parties. Under the terms of surety bonds, the Companies are obligated to indemnify the respective surety bond company for any amounts paid.

Credit Risk

Credit Risk	3 Months Ended
	Mar. 31, 2018
Risks And Uncertainties [Abstract]
Credit Risk	Note 17. Credit Risk The Companies' accounting policies for credit risk are discussed in Note 23 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2017. At March 31, 2018, Dominion Energy's gross credit exposure related to energy marketing and price risk management activities totaled $112 million. After the application of collateral, such credit exposure is reduced to $108 million. Of this amount, investment grade counterparties, including those internally rated, represented 51%. No single counterparty, whether investment grade or non-investment grade, exceeded $31 million of exposure. At March 31, 2018, Virginia Power's exposure related to sales to wholesale customers totaled $55 million. Of this amount, investment grade counterparties, including those internally rated, represented 25%. No single counterparty, whether investment grade or non-investment grade, exceeded $9 million of exposure. At March 31, 2018, Dominion Energy Gas' exposure primarily related to sales to wholesale customers totaled $8 million. Of this amount, investment grade counterparties, including those internally rated, represented 14%. No single counterparty, whether investment grade or non-investment grade, exceeded $2 million of exposure. Credit-Related Contingent Provisions The majority of Dominion Energy's derivative instruments contain credit-related contingent provisions. These provisions require Dominion Energy to provide collateral upon the occurrence of specific events, primarily a credit rating downgrade. If the credit-related contingent features underlying these instruments that are in a liability position and not fully collateralized with cash were fully triggered as of March 31, 2018 and December 31, 2017, Dominion Energy would have been required to post less than $1 million and $62 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 no collateral at March 31, 2018 or December 31, 2017 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 at March 31, 2018 and December 31, 2017 was $2 million and $65 million, respectively, which does not include the impact of any offsetting asset positions. Credit-related contingent provisions for Virginia Power and Dominion Energy Gas were not material as of March 31, 2018 and December 31, 2017. See Note 9 for further information about derivative instruments.

Related-Party Transactions

Related-Party Transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related-Party Transactions	Note 18. Related-Party Transactions Virginia Power and Dominion Energy Gas engage in related-party transactions primarily with other Dominion Energy subsidiaries (affiliates). Virginia Power's and Dominion Energy Gas' receivable and payable balances with affiliates are settled based on contractual terms or on a monthly basis, depending on the nature of the underlying transactions. Virginia Power and Dominion Energy Gas are included in Dominion Energy's consolidated federal income tax return and, where applicable, combined income tax returns for Dominion Energy are filed in various states. 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 commodity swaps, to manage commodity price risks associated with purchases of natural gas. At March 31, 2018, Virginia Power’s derivative assets and liabilities with affiliates were $5 million and $7 million, respectively. At December 31, 2017, Virginia Power’s derivative assets and liabilities with affiliates were $11 million and $5 million, respectively. See Note 9 for more information. Virginia Power participates in certain Dominion Energy benefit plans described in Note 21 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017. At March 31, 2018 and December 31, 2017, 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 $537 million and $505 million, respectively. At March 31, 2018 and December 31, 2017, 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 $218 million and $199 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 March 31, 2018 2017 (millions) Commodity purchases from affiliates $ 398 $ 212 Services provided by affiliates (1) 120 112 Services provided to affiliates 6 5 (1) Includes capitalized expenditures of $37 million and $34 million for the three months ended March 31, 2018 and 2017, respectively. Virginia Power has borrowed funds from Dominion Energy under short-term borrowing arrangements. There were $11 million and $33 million in short-term demand note borrowings from Dominion Energy as of March 31, 2018 and December 31, 2017, respectively. Virginia Power had no outstanding borrowings, net of repayments, under the Dominion Energy money pool for its nonregulated subsidiaries as of March 31, 2018 and December 31, 2017. Interest charges related to Virginia Power's borrowings from Dominion Energy were immaterial for the three months ended March 31, 2018 and 2017. There were no issuances of Virginia Power's common stock to Dominion Energy for the three months ended March 31, 2018 and 2017. Dominion Energy Gas Transactions with Related Parties Dominion Energy Gas transacts with affiliates for certain quantities of natural gas and other commodities at market prices in the ordinary course of business. Additionally, Dominion Energy Gas provides transportation and storage services to affiliates. Dominion Energy Gas also enters into certain other contracts with affiliates and related parties, including construction services, which are presented separately from contracts involving commodities or services. As of March 31, 2018, Dominion Energy Gas had less than $1 million of derivative assets and liabilities with affiliates. As of December 31, 2017, all of Dominion Energy Gas' commodity derivatives were with affiliates. See Notes 7 and 9 for more information. See Note 10 for information regarding transactions with Atlantic Coast Pipeline. Dominion Energy Gas participates in certain Dominion Energy benefit plans as described in Note 21 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017. At March 31, 2018 and December 31, 2017, amounts due from Dominion Energy associated with the Dominion Energy Pension Plan included in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $744 million and $734 million, respectively. At March 31, 2018 and December 31, 2017, Dominion Energy Gas' amounts due from Dominion Energy associated with the Dominion Energy Retiree Health and Welfare Plan included in noncurrent pension and other postretirement benefit assets in the Consolidated Balance Sheets were $9 million and $7 million, respectively. The financial statements for all years presented include costs for certain general, administrative and corporate expenses assigned by DES to Dominion Energy Gas on the basis of direct and allocated methods in accordance with Dominion Energy Gas’ 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 Dominion Energy Gas’ significant transactions with DES and other affiliates and related parties: Three Months Ended March 31, 2018 2017 (millions) Sales of natural gas and transportation and storage services to affiliates $ 18 $ 18 Purchases of natural gas and transportation and storage services from affiliates 3 — Services provided by related parties (1) 33 35 Services provided to related parties (2) 52 39 (1) Includes capitalized expenditures of $10 million and $8 million for the three months ended March 31, 2018 and 2017, respectively. (2) Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE. The following table presents affiliated and related party balances reflected in Dominion Energy Gas' Consolidated Balance Sheets: March 31, 2018 December 31, 2017 (millions) Other receivables (1) $ 17 $ 12 Customer receivables from related parties — 1 Imbalances receivable from affiliates (2) — 1 Affiliated notes receivable (3) 19 20 (1) Represents amounts due from Atlantic Coast Pipeline, a related-party VIE. (2) Amounts are presented in other current assets in Dominion Energy Gas' Consolidated Balance Sheets. (3) Amounts are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets. Dominion Energy Gas' borrowings under the intercompany revolving credit agreement with Dominion Energy were $41 million and $18 million as of March 31, 2018 and December 31, 2017, respectively. Interest charges related to Dominion Energy Gas' total borrowings from Dominion Energy were immaterial for the three months ended March 31, 2018 and 2017.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	Note 19. Employee Benefit Plans Dominion Energy The components of Dominion Energy's provision for net periodic benefit cost (credit) were as follows: Pension Benefits Other Postretirement Benefits 2018 2017 2018 2017 (millions) Three Months Ended March 31, Service cost $ 39 $ 35 $ 7 $ 7 Interest cost 84 86 14 16 Expected return on plan assets (165 ) (159 ) (36 ) (32 ) Amortization of prior service credit — — (13 ) (12 ) Amortization of net actuarial loss 48 40 3 3 Settlements — 1 — — Net periodic benefit cost (credit) (1) $ 6 $ 3 $ (25 ) $ (18 ) (1) The components of net periodic benefit cost (credit) other than the service cost component are included in other income in the Consolidated Statements of Income. Employer Contributions During the three months ended March 31, 2018, Dominion Energy made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs during the remainder of 2018. Dominion Energy Gas Dominion Energy Gas participates in certain Dominion Energy benefit plans as described in Note 21 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2017. See Note 18 for more information. The components of Dominion Energy Gas' provision for net periodic benefit cost (credit) for employees represented by collective bargaining units were as follows: Pension Benefits Other Postretirement Benefits 2018 2017 2018 2017 (millions) Three Months Ended March 31, Service cost $ 4 $ 4 $ 1 $ 1 Interest cost 7 7 3 3 Expected return on plan assets (37 ) (35 ) (8 ) (6 ) Amortization of prior service credit — — (1 ) — Amortization of net actuarial loss 5 4 1 1 Net periodic benefit credit (1) $ (21 ) $ (20 ) $ (4 ) $ (1 ) (1) The components of net periodic benefit credit other than the service cost component are included in other income in the Consolidated Statements of Income. Employer Contributions During the three months ended March 31, 2018, Dominion Energy Gas made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy Gas expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs, for both employees represented by collective bargaining units and employees not represented by collective bargaining units, during the remainder of 2018.

Operating Segments

Operating Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Operating Segments	Note 20. 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 Gas Power Delivery Regulated electric distribution X X Regulated electric transmission X X Power Generation Regulated electric fleet X X Merchant electric fleet X Gas Infrastructure Gas transmission and storage X X Gas distribution and storage X X Gas gathering and processing X X LNG terminalling and storage X Nonregulated retail energy marketing X 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). 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. In the three months ended March 31, 2018, Dominion Energy reported after-tax net expenses of $238 million for specific items in the Corporate and Other segment, with $218 million of net expenses attributable to its operating segments. In the three months ended March 31, 2017, Dominion Energy reported after-tax net income of $21 million for specific items in the Corporate and Other segment, all of which was attributable to its operating segments. The net expense for specific items attributable to Dominion Energy’s operating segments in 2018 primarily related to the impact of the following items: • A $215 million ($160 million after-tax) charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers, attributable to: • Power Generation ($109 million after-tax); and • Power Delivery ($51 million after-tax). • A $43 million ($32 million after-tax) loss on investments held in nuclear decommissioning trust funds, attributable to Power Generation. The net income for specific items attributable to Dominion Energy's operating segments in 2017 primarily related to the impact of the following item, which was attributable to Power Generation: • A $34 million ($21 million after-tax) net gain on investments held in nuclear decommissioning trust funds. The following table presents segment information pertaining to Dominion Energy’s operations: Power Delivery Power Generation Gas Infrastructure Corporate and Other Adjustments/ Eliminations Consolidated Total (millions) Three Months Ended March 31, 2018 Total revenue from external customers $ 563 $ 1,860 $ 1,222 $ (207 ) $ 28 $ 3,466 Intersegment revenue 6 2 6 175 (189 ) — Total operating revenue 569 1,862 1,228 (32 ) (161 ) 3,466 Net income (loss) attributable to Dominion Energy 156 348 327 (328 ) — 503 Three Months Ended March 31, 2017 Total revenue from external customers $ 554 $ 1,653 $ 901 $ 3 $ 273 $ 3,384 Intersegment revenue 5 3 266 152 (426 ) — Total operating revenue 559 1,656 1,167 155 (153 ) 3,384 Net income (loss) attributable to Dominion Energy 125 261 263 (17 ) — 632 Intersegment sales and transfers for Dominion Energy are based on contractual arrangements and may result in intersegment profit or loss that is eliminated in consolidation. Virginia Power The Corporate and Other Segment of Virginia Power primarily includes specific items attributable to its operating segments that are not included in profit measures evaluated by executive management in assessing the segments' performance or in allocating resources. In the three months ended March 31, 2018, Virginia Power reported after-tax net expenses of $197 million for specific items in the Corporate and Other segment, with $189 million of net expenses attributable to its operating segments. In the three months ended March 31, 2017, Virginia Power reported after-tax net income of $2 million for specific items in the Corporate and Other segment, all of which was attributable to its operating segments. The net expense for specific items attributable to Virginia Power’s operating segments in 2018 primarily related to the impact of the following items: • A $215 million ($160 million after-tax) charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers, attributable to: • Power Generation ($109 million after-tax); and • Power Delivery ($51 million after-tax). • A $31 million ($23 million after-tax) charge for storm damage and service restoration costs associated with Winter Storm Riley affecting its Virginia service territory, attributable to Power Delivery. The following table presents segment information pertaining to Virginia Power’s operations: Power Delivery Power Generation Corporate and Other Consolidated Total (millions) Three Months Ended March 31, 2018 Operating revenue $ 563 $ 1,400 $ (215 ) $ 1,748 Net income (loss) 154 222 (192 ) 184 Three Months Ended March 31, 2017 Operating revenue $ 557 $ 1,274 $ — $ 1,831 Net income 125 223 8 356 Dominion Energy Gas The Corporate and Other Segment of Dominion Energy Gas primarily includes specific items attributable to Dominion Energy Gas' operating segment that are not included in profit measures evaluated by executive management in assessing the segment's performance or in allocating resources and the effect of certain items recorded at Dominion Energy Gas as a result of Dominion Energy's basis in the net assets contributed. In both the three months ended March 31, 2018 and 2017, Dominion Energy Gas reported no specific items in the Corporate and Other segment. The following table presents segment information pertaining to Dominion Energy Gas' operations: Gas Infrastructure Corporate Other Consolidated Total (millions) Three Months Ended March 31, 2018 Operating revenue $ 526 $ — $ 526 Net income (loss) 167 (1 ) 166 Three Months Ended March 31, 2017 Operating revenue $ 490 $ — $ 490 Net income (loss) 109 (1 ) 108

Significant Accounting Polici29

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
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, 2017.
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.
Consolidation, consolidated entities and noncontrolling interest	For certain partnership structures, income is allocated based on the liquidation value of the underlying contractual arrangements. At March 31, 2018, Dominion Energy owns the general partner, 50.5% of the common and subordinated units and 37.5% of the convertible preferred interests in Dominion Energy Midstream. The public’s ownership interest in Dominion Energy Midstream is reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements. Also, at March 31, 2018, Dominion Energy owns 50% of the units in and consolidates Four Brothers and Three Cedars. NRG's ownership interest in Four Brothers and Three Cedars, as well as Terra Nova Renewable Partners' 33% interest in certain Dominion Energy merchant solar projects, is reflected as noncontrolling interest in Dominion Energy’s Consolidated Financial Statements.
Reclassifications	Certain amounts in the Companies' 2017 Consolidated Financial Statements and Notes have been reclassified as a result of the adoption of revised accounting guidance pertaining to certain net periodic pension and other postretirement benefit costs, restricted cash and equivalents and certain distributions from equity method investees. In addition, certain other amounts have been reclassified to conform to the 2018 presentation for comparative purposes; however, such reclassifications did not affect the Companies’ net income, total assets, liabilities, equity or cash flows.
Operating Revenue	Operating Revenue Operating revenue is recorded on the basis of services rendered, commodities delivered or contracts settled and includes amounts yet to be billed to customers. Dominion Energy and Virginia Power collect sales, consumption and consumer utility taxes and Dominion Energy Gas collects sales taxes; however, these amounts are excluded from revenue. Dominion Energy’s customer receivables include accrued unbilled revenue based on estimated amounts of electricity and natural gas delivered but not yet billed to utility customers. Virginia Power’s customer receivables include accrued unbilled revenue based on estimated amounts of electricity delivered but not yet billed to customers. Dominion Energy Gas’ customer receivables include accrued unbilled revenue based on estimated amounts of natural gas delivered but not yet billed to customers. The primary types of sales and service activities reported as operating revenue for Dominion Energy, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales consist primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Nonregulated electric sales consist primarily of sales of electricity at market-based rates and contracted fixed rates, and associated hedging activity; • Regulated gas sales consist primarily of state-regulated natural gas sales and related distribution services; • Nonregulated gas sales consist primarily of sales of natural gas production at market-based rates and contracted fixed prices, sales of gas purchased from third parties and associated hedging activity; • Regulated gas transportation and storage sales consist of FERC-regulated sales of transmission and storage services and state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • Nonregulated gas transportation and storage sales consist primarily of LNG terminalling services, beginning in April 2018; • Other regulated revenue consists primarily of miscellaneous service revenue from electric and gas distribution operations and sales of excess electric capacity and other commodities; and • Other nonregulated revenue consists primarily of NGL gathering and processing, sales of NGL production and condensate, extracted products and associated hedging activity. Other nonregulated revenue also includes services performed for Atlantic Coast Pipeline, sales of energy-related products and services from Dominion Energy’s retail energy marketing operations, service concession arrangements and gas processing and handling revenue. Other Revenue • Other revenue consists primarily of alternative revenue programs, gains and losses from derivative instruments not subject to hedge accounting and lease revenues. The primary types of sales and service activities reported as operating revenue for Dominion Energy, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales consisted primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Nonregulated electric sales consisted primarily of sales of electricity at market-based rates and contracted fixed rates, and associated derivative activity; • Regulated gas sales consisted primarily of state- and FERC-regulated natural gas sales and related distribution services and associated derivative activity; • Nonregulated gas sales consisted primarily of sales of natural gas production at market-based rates and contracted fixed prices, sales of gas purchased from third parties, gas trading and marketing revenue and associated derivative activity; • Gas transportation and storage sales consisted primarily of FERC-regulated sales of transmission and storage services. Also included were state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; and • Other revenue consisted primarily of sales of NGL production and condensate, extracted products and associated derivative activity. Other revenue also included miscellaneous service revenue from electric and gas distribution operations, sales of energy-related products and services from Dominion Energy’s retail energy marketing operations and gas processing and handling revenue. The primary types of sales and service activities reported as operating revenue for Virginia Power, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated electric sales consist primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; • Other regulated revenue consists primarily of sales of excess capacity and other commodities and miscellaneous service revenue from electric distribution operations; and • Other nonregulated revenue consists primarily of sales to non-jurisdictional customers from certain solar facilities, revenue from renting space on certain electric transmission poles and distribution towers and service concession arrangements. Other Revenue • Other revenue consists primarily of alternative revenue programs and gains and losses from derivative instruments not subject to hedge accounting. The primary types of sales and service activities reported as operating revenue for Virginia Power, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated electric sales consisted primarily of state-regulated retail electric sales, and federally-regulated wholesale electric sales and electric transmission services; and • Other revenue consisted primarily of miscellaneous service revenue from electric distribution operations and miscellaneous revenue from generation operations, including sales of capacity and other commodities. The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, are as follows: Revenue from Contracts with Customers • Regulated gas sales consist primarily of state-regulated natural gas sales and related distribution services; • Nonregulated gas sales consist primarily of sales of gas purchased from third parties and royalty revenues; • Regulated gas transportation and storage sales consist of FERC-regulated sales of transmission and storage services and state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • NGL revenue consists primarily of NGL gathering and processing, sales of NGL production and condensate, extracted products and associated hedging activity; • Management service revenue consists primarily of services performed for Atlantic Coast Pipeline; • Other regulated revenue consists primarily of miscellaneous regulated revenues; and • Other nonregulated revenue consists primarily of miscellaneous service revenue. Other Revenue • Other revenue consists primarily of gains and losses from derivative instruments not subject to hedge accounting. The primary types of sales and service activities reported as operating revenue for Dominion Energy Gas, prior to the adoption of revised guidance for revenue recognition from contracts with customers, were as follows: • Regulated gas sales consisted primarily of state- and FERC-regulated natural gas sales and related distribution services; • Nonregulated gas sales consisted primarily of sales of natural gas production at market-based rates and contracted fixed prices and sales of gas purchased from third parties. Revenue from sales of gas production was recognized based on actual volumes of gas sold to purchasers and was reported net of royalties; • Gas transportation and storage sales consisted primarily of FERC-regulated sales of transmission and storage services. Also included were state-regulated gas distribution charges to retail distribution service customers opting for alternate suppliers and sales of gathering services; • NGL revenue consisted primarily of sales of NGL production and condensate, extracted products and associated derivative activity; and • Other revenue consisted primarily of miscellaneous service revenue, gas processing and handling revenue. Alternative revenue programs compensate Dominion Energy and Virginia Power for certain projects and initiatives. Revenues arising from these programs are presented separately from revenue arising from contracts with customers in the categories above. Currently, Dominion Energy and Virginia Power account for the equity return for under-recovery of certain riders under the alternative revenue program guidance. Revenues from electric and gas sales are recognized over time, as the customers of the Companies consume the gas and electricity as it is delivered. Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. LNG terminalling services, beginning in April 2018, are also stand-ready service contracts with fixed fees. Fixed fees are recognized ratably over the life of the contract as the stand-ready performance obligation is satisfied, while variable usage fees are recognized when Dominion Energy and Dominion Energy Gas have a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the performance obligation completed to date. Sales of products, such as NGLs, typically transfer control and are recognized as revenue upon delivery of the product. The customer is able to direct the use of, and obtain substantially all of the benefits from, the product at the time the product is delivered. The contract with the customer states the final terms of the sale, including the description, quantity and price of each product or service purchased. Payment for most sales and services varies by contract type, but is typically due within a month of billing. Dominion Energy and Dominion Energy Gas typically receive or retain NGLs and natural gas from customers when providing natural gas processing, transportation or storage services. The revised guidance for revenue from contracts with customers requires entities to include the fair value of the noncash consideration in the transaction price. Therefore, subsequent to the adoption of the revised guidance for revenue recognition from contracts with customers, Dominion Energy and Dominion Energy Gas record the fair value of NGLs received during natural gas processing as service revenue recognized over time, and continue to recognize revenue from the subsequent sale of the NGLs to customers upon delivery. Dominion Energy and Dominion Energy Gas typically retain natural gas under certain transportation service arrangements that are intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the allowance is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue.
Cash, Restricted Cash and Equivalents	Cash, Restricted Cash and Equivalents Restricted Cash and Equivalents The Companies hold restricted cash and equivalent balances that primarily consist of amounts held for certain customer deposits, future debt payments on SBL Holdco and Dominion Solar Projects III, Inc.’s term loan agreements and a distribution reserve at Cove Point. Upon adoption of revised accounting guidance in January 2018, restricted cash and equivalents are included within the Companies’ Consolidated Statements of Cash Flows, with the change in balance no longer considered a separate investing activity. The guidance required retrospective application which resulted in an adjustment to Dominion Energy’s other cash provided by investing activities for the three months ended March 31, 2017, which had been previously reported as $11 million. There was no impact to Virginia Power or Dominion Energy Gas for the three months ended March 31, 2017. 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 three months ended March 31, 2018 and 2017: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period March 31, 2018 March 31, 2017 December 31, 2017 December 31, 2016 (millions) Dominion Energy Cash and cash equivalents $ 189 $ 486 $ 120 $ 261 Restricted cash and equivalents (1) 145 54 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 334 $ 540 $ 185 $ 322 Virginia Power Cash and cash equivalents $ 6 $ 289 $ 14 $ 11 Restricted cash and equivalents (1) 10 — 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 16 $ 289 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents $ 6 $ 11 $ 4 $ 23 Restricted cash and equivalents (1) 23 20 26 20 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 29 $ 31 $ 30 $ 43 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
Investments	Distributions from Equity Method Investees Dominion Energy and Dominion Energy Gas each hold investments that are accounted for under the equity method of accounting. Effective January 2018, Dominion Energy and Dominion Energy Gas classify distributions from equity method investees as either cash flows from operating activities or cash flows from investing activities in the Consolidated Statements of Cash Flows according to the nature of the distribution. Distributions received are classified on the basis of the nature of the activity of the investee that generated the distribution as either a return on investment (classified as cash flows from operating activities) or a return of an investment (classified as cash flows from investing activities) when such information is available to Dominion Energy and Dominion Energy Gas. Previously, distributions were determined to be either a return on an investment or return of an investment based on a cumulative earnings approach whereby any distributions received in excess of earnings were considered to be a return of an investment. Dominion Energy and Dominion Energy Gas have applied this approach on a retrospective basis with no impact to the three months ended March 31, 2017. Investments Debt and Equity Securities with Readily Determinable Fair Values Dominion Energy accounts for and classifies investments in debt securities as trading or available-for-sale securities. Virginia Power classifies investments in debt securities as available-for-sale securities. • Debt securities classified as trading securities include securities held by Dominion Energy in rabbi trusts associated with certain deferred compensation plans. These securities are reported in other investments in the Consolidated Balance Sheets at fair value with net realized and unrealized gains and losses included in other income in the Consolidated Statements of Income. • Debt securities classified as available-for-sale securities include all other debt securities, primarily comprised of securities held in the nuclear decommissioning trusts. These investments are reported at fair value in nuclear decommissioning trust funds in the Consolidated Balance Sheets. Net realized and unrealized gains and losses (including any other-than-temporary impairments) on investments held in Virginia Power’s nuclear decommissioning trusts are recorded to a regulatory liability for certain jurisdictions subject to cost-based regulation. For all other available-for-sale debt securities, including those held in Dominion Energy’s merchant generation nuclear decommissioning trusts, net realized gains and losses (including any other-than-temporary impairments) are included in other income and unrealized gains and losses are reported as a component of AOCI, after-tax. In determining realized gains and losses for debt securities, the cost basis of the security is based on the specific identification method. Equity securities with readily determinable fair values include securities held by Dominion Energy in rabbi trusts associated with certain deferred compensation plans and securities held by Dominion Energy and Virginia Power in the nuclear decommissioning trusts. Dominion Energy and Virginia Power record all equity securities with a readily determinable fair value, or for which they are permitted to estimate fair value using NAV (or its equivalent), at fair value in nuclear decommissioning trust funds and other investments in the Consolidated Balance Sheets. However, Dominion Energy and Virginia Power may elect a measurement alternative for equity securities without a readily determinable fair value. Under the measurement alternative, equity securities are reported at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. Dominion Energy and Virginia Power qualitatively assess equity securities reported using the measurement alternative to determine whether an investment is impaired on an ongoing basis. Net realized and unrealized gains and losses on equity securities held in Virginia Power’s nuclear decommissioning trusts are recorded to a regulatory liability for certain jurisdictions subject to cost-based regulation. For all other equity securities, including those held in Dominion Energy’s merchant generation nuclear decommissioning trusts and rabbi trusts, net realized and unrealized gains and losses are included in other income in the Consolidated Statements of Income. Equity Securities without Readily Determinable Fair Values The Companies account for illiquid and privately held securities without readily determinable fair values under either the equity method or cost method. Equity securities without readily determinable fair values include: • Equity method investments when the Companies have the ability to exercise significant influence, but not control, over the investee. Dominion Energy’s investments are included in investments in equity method affiliates and Dominion Energy Gas’ investments are included in investments in their Consolidated Balance Sheets. Dominion Energy and Dominion Energy Gas record equity method adjustments in other income and earnings from equity method investee, respectively, in their Consolidated Statements of Income, including their proportionate share of investee income or loss, gains or losses resulting from investee capital transactions, amortization of certain differences between the carrying value and the equity in the net assets of the investee at the date of investment and other adjustments required by the equity method. • Cost method investments when Dominion Energy and Virginia Power do not have the ability to exercise significant influence over the investee. Dominion Energy’s and Virginia Power’s investments are included in other investments and nuclear decommissioning trust funds. Cost method investments are reported at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer. Other-Than-Temporary Impairment The Companies periodically review their investments in debt securities and equity method investments to determine whether a decline in fair value should be considered other-than-temporary. If a decline in the fair value of any security is determined to be other-than-temporary, the security is written down to its fair value at the end of the reporting period. Decommissioning Trust Investments – Special Considerations • The recognition provisions of other-than-temporary impairment guidance apply only to debt securities classified as available-for-sale or held-to-maturity. • Debt securities – Using information obtained from their nuclear decommissioning trust fixed-income investment managers, Dominion Energy and Virginia Power record in earnings any unrealized loss for a debt security when the manager intends to sell the debt security or it is more-likely-than-not that the manager will have to sell the debt security before recovery of its fair value up to its cost basis. If that is not the case, but the debt security is deemed to have experienced a credit loss, Dominion Energy and Virginia Power record the credit loss in earnings and any remaining portion of the unrealized loss in AOCI. Credit losses are evaluated primarily by considering the credit ratings of the issuer, prior instances of non-performance by the issuer and other factors.
New Accounting Standards	New Accounting Standards Revenue Recognition In May 2014, the FASB issued revised accounting guidance for revenue recognition from contracts with customers. The Companies adopted this revised accounting guidance for interim and annual reporting periods beginning January 1, 2018 using the modified retrospective method. Upon the adoption of the standard, Dominion Energy and Dominion Energy Gas recorded the cumulative-effect of a change in accounting principle of $3 million to retained earnings and membership interests, respectively, and to establish a contract asset related to changes in the timing of revenue recognition for three existing contracts with customers at DETI. As a result of adopting this revised accounting guidance, Dominion Energy and Dominion Energy Gas recorded offsetting operating revenue and other energy-related purchases of $25 million in the Consolidated Statements of Income for non-cash consideration for performing processing and fractionation services related to NGLs for the three months ended March 31, 2018. No such amounts were recorded during the three months ended March 31, 2017. Dominion Energy and Dominion Energy Gas no longer record offsetting operating revenue and purchased gas for fuel retained to offset costs on certain transportation and storage arrangements. Such amounts at Dominion Energy and Dominion Energy Gas were $32 million and $24 million, respectively, recorded in the Consolidated Statements of Income for the three months ended March 31, 2017. Financial Instruments In January 2016, the FASB issued revised accounting guidance for the recognition, measurement, presentation and disclosure of financial instruments. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018 and the Companies adopted the standard using the modified retrospective method. Upon adoption of this guidance for equity securities held at January 1, 2018, Dominion Energy and Virginia Power recorded the cumulative-effect of a change in accounting principle to reclassify net unrealized gains from AOCI to retained earnings and to recognize equity securities previously categorized as cost method investments at fair value (using NAV) in nuclear decommissioning trust funds in the Consolidated Balance Sheets and a cumulative-effect adjustment to retained earnings. Dominion Energy and Virginia Power reclassified approximately $1.1 billion ($734 million after-tax) and $119 million ($73 million after-tax), respectively, of net unrealized gains from AOCI to retained earnings. Dominion Energy and Virginia Power also recorded approximately $36 million ($22 million after-tax) in net unrealized gains on equity securities previously classified as cost method investments, of which $3 million was recorded to retained earnings and $33 million was recorded to regulatory liabilities for net unrealized gains subject to cost-based regulation. As a result of adopting this revised accounting guidance, for the three months ended March 31, 2018, Dominion Energy and Virginia Power recorded $47 million ($38 million after-tax) and $8 million ($6 million after-tax), respectively, of unrealized losses on equity securities, net of regulatory deferrals, in other income in the Consolidated Statements of Income, resulting in a $0.06 loss per share at Dominion Energy. Derecognition and Partial Sales of Nonfinancial Assets In February 2017, the FASB issued revised accounting guidance clarifying the scope of asset derecognition guidance and accounting for partial sales of nonfinancial assets. The guidance became effective for the Companies’ interim and annual reporting periods beginning January 1, 2018, and the Companies adopted the standard using the modified retrospective method. Upon adoption of the standard, Dominion Energy recorded the cumulative-effect of a change in accounting principle to reclassify $127 million from noncontrolling interests to common stock related to the sale of a noncontrolling interest in certain merchant solar projects completed in December 2015 and January 2016. Net Periodic Pension and Other Postretirement Benefit Costs In March 2017, the FASB issued revised accounting guidance for the presentation of net periodic pension and other postretirement benefit costs. The update requires that the service cost component of net periodic pension and other postretirement benefit costs be classified in the same line item as other compensation costs arising from services rendered by employees, while other components of net periodic pension and other postretirement costs are classified outside of income from operations. In addition, only the service cost component remains eligible for capitalization during construction. These changes do not impact the accounting by participants in a multi-employer plan. This guidance became effective for the Companies beginning January 1, 2018 with a retrospective adoption for income statement presentation and a prospective adoption for capitalization. Dominion Energy’s and Dominion Energy Gas’ Consolidated Statements of Income for the three months ended March 31, 2017 have been recast to reflect retrospective adoption for the presentation of the non-service cost component of net periodic pension and other postretirement benefit costs. Previously, the non-service cost component for Dominion Energy and Dominion Energy Gas was reflected in other operations and maintenance in the Consolidated Statements of Income, along with the service cost component of net periodic pension and other postretirement benefit costs. Subsequent to the adoption of this guidance, the non-service cost component of net periodic pension and other postretirement benefit costs is recorded in other income in the Consolidated Statements of Income. As previously reported, Dominion Energy’s operations and maintenance expense and other income were $738 million and $116 million, respectively, and Dominion Energy Gas’ other operations and maintenance expense and other income were $133 million and $5 million, respectively. Tax Reform In February 2018, the FASB issued revised accounting guidance to provide clarification on the application of the 2017 Tax Reform Act for balances recorded within AOCI. The revised guidance provides for stranded amounts within AOCI from the impacts of the 2017 Tax Reform Act to be reclassified to retained earnings. The Companies adopted this guidance for interim and annual reporting periods beginning January 1, 2018 on a prospective basis. In connection with the adoption of this guidance, Dominion Energy reclassified a benefit of $289 million from AOCI to retained earnings, Virginia Power reclassified a benefit of $3 million from AOCI to retained earnings and Dominion Energy Gas reclassified a benefit of $26 million from AOCI to membership interests. The amounts reclassified reflect the reduction in the federal income tax rate, and the federal benefit of state income taxes, on the components of the Companies’ AOCI.
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. The unobservable inputs are developed and substantiated using historical information, available market data, third-party data, and statistical analysis. Periodically, inputs to valuation models are reviewed and revised as needed, based on historical information, updated market data, market liquidity and relationships, and changes in third-party pricing sources.
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 matters for which the Companies cannot estimate a range of possible loss, 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 for which 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 for which the Companies cannot estimate a range of possible loss, 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 for which 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 financial position, liquidity or results of operations of the Companies.
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.

Significant Accounting Polici30

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Reconciliation of Total Cash, Restricted Cash and Equivalents	Upon adoption of revised accounting guidance in January 2018, restricted cash and equivalents are included within the Companies’ Consolidated Statements of Cash Flows, with the change in balance no longer considered a separate investing activity. The guidance required retrospective application which resulted in an adjustment to Dominion Energy’s other cash provided by investing activities for the three months ended March 31, 2017, which had been previously reported as $11 million. There was no impact to Virginia Power or Dominion Energy Gas for the three months ended March 31, 2017. 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 three months ended March 31, 2018 and 2017: Cash, Restricted Cash and Equivalents at End of Period Cash, Restricted Cash and Equivalents at Beginning of Period March 31, 2018 March 31, 2017 December 31, 2017 December 31, 2016 (millions) Dominion Energy Cash and cash equivalents $ 189 $ 486 $ 120 $ 261 Restricted cash and equivalents (1) 145 54 65 61 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 334 $ 540 $ 185 $ 322 Virginia Power Cash and cash equivalents $ 6 $ 289 $ 14 $ 11 Restricted cash and equivalents (1) 10 — 10 — Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 16 $ 289 $ 24 $ 11 Dominion Energy Gas Cash and cash equivalents $ 6 $ 11 $ 4 $ 23 Restricted cash and equivalents (1) 23 20 26 20 Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows $ 29 $ 31 $ 30 $ 43 (1) Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.

Operating Revenue (Tables)

Operating Revenue (Tables)	3 Months Ended
	Mar. 31, 2018
Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers	The Companies’ operating revenue, prior to the adoption of revised guidance for revenue recognition from contracts with customers, consisted of the following: Three Months Ended March 31, 2017 (millions) Dominion Energy Electric sales: Regulated $ 1,766 Nonregulated 427 Gas sales: Regulated 448 Nonregulated 144 Gas transportation and storage 492 Other 107 Total operating revenue $ 3,384 Virginia Power Regulated electric sales $ 1,766 Other 65 Total operating revenue $ 1,831 Dominion Energy Gas Gas sales: Regulated $ 32 Nonregulated 2 Gas transportation and storage 396 Other 60 Total operating revenue $ 490
Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized	The table below discloses the aggregate amount of the transaction price allocated to fixed-price performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period and when the Companies expect to recognize this revenue. These revenues relate to contracts containing fixed prices where the Companies will earn the associated revenue over time as they stand ready to perform services provided. This disclosure does not include revenue related to performance obligations that are part of a contract with original durations of one year or less. In addition, this disclosure does not include expected consideration related to performance obligations for which the Companies elect to recognize revenue in the amount they have a right to invoice. Revenue expected to be recognized on multi-year contracts in place at March 31, 2018 2018 2019 2020 2021 2022 Thereafter Total (millions) Dominion Energy $ 1,251 $ 1,709 $ 1,593 $ 1,474 $ 1,327 $ 14,686 $ 22,040 Virginia Power 16 21 3 1 — — 41 Dominion Energy Gas 479 632 562 473 379 2,084 4,609
Subsequent To Adoption of Revised Guidance
Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers	The Companies’ operating revenue, subsequent to the adoption of revised guidance for revenue recognition from contracts with customers, consists of the following: Three Months Ended March 31, 2018 (millions) Dominion Energy Regulated electric sales: Residential $ 817 Commercial 524 Industrial 107 Government and other retail 213 Wholesale 42 Nonregulated electric sales 418 Regulated gas sales: Residential 364 Commercial 103 Other 10 Nonregulated gas sales 88 Regulated gas transportation and storage: FERC-regulated 262 State-regulated 190 Other regulated revenues 50 Other nonregulated revenues (1)(2) 136 Total operating revenue from contracts with customers 3,324 Other revenues 142 Total operating revenue $ 3,466 Virginia Power Regulated electric sales: Residential $ 817 Commercial 524 Industrial 107 Government and other retail 213 Wholesale 42 Other regulated revenues 32 Other nonregulated revenues (1) 13 Total operating revenue from contracts with customers $ 1,748 Dominion Energy Gas Regulated gas sales: Residential $ 29 Other 7 Nonregulated gas sales (1) 2 Regulated gas transportation and storage: FERC-regulated (1) 199 State-regulated (1) 180 NGL revenue (1)(2) 54 Management service revenue (1) 47 Other regulated revenues (1) 8 Other nonregulated revenues (1) 2 Total operating revenue from contracts with customers 528 Other revenues (1) (2 ) Total operating revenue $ 526 (1) See Notes 10 and 18 for amounts attributable to related parties and affiliates. (2) Amounts above include $30 million and $26 million of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time.

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
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 Dominion Energy Gas Three Months Ended March 31, 2018 2017 2018 2017 2018 2017 U.S. statutory rate 21.0 % 35.0 % 21.0 % 35.0 % 21.0 % 35.0 % Increases (reductions) resulting from: State taxes, net of federal benefit 4.1 2.8 4.5 3.8 4.3 0.3 Investment tax credits (0.5 ) (4.2 ) (0.9 ) (0.8 ) — — Production tax credits (0.6 ) (0.8 ) (0.7 ) (0.6 ) — — Reversal of excess deferred income taxes (1.4 ) — (2.0 ) — (1.0 ) — Other, net (2.1 ) (3.8 ) (0.3 ) (0.6 ) (0.4 ) (0.6 ) Effective tax rate 20.5 % 29.0 % 21.6 % 36.8 % 23.9 % 34.7 %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 2017 (millions, except EPS) Net income attributable to Dominion Energy $ 503 $ 632 Average shares of common stock outstanding – Basic 650.5 628.1 Net effect of dilutive securities — — Average shares of common stock outstanding – Diluted 650.5 628.1 Earnings Per Common Share – Basic $ 0.77 $ 1.01 Earnings Per Common Share – Diluted $ 0.77 $ 1.01

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 Beginning balance $ (302 ) $ 747 $ (1,101 ) $ (3 ) $ (659 ) Other comprehensive income before reclassifications: gains (losses) 111 (13 ) — — 98 Amounts reclassified from AOCI: losses (1) 8 1 25 — 34 Net current period other comprehensive income (loss) 119 (12 ) 25 — 132 Cumulative-effect of changes in accounting principle (64 ) (732 ) (227 ) — (1,023 ) Less other comprehensive income attributable to noncontrolling interest 1 — — — 1 Ending balance $ (248 ) $ 3 $ (1,303 ) $ (3 ) $ (1,551 ) Three Months Ended March 31, 2017 Beginning balance $ (280 ) $ 569 $ (1,082 ) $ (6 ) $ (799 ) Other comprehensive income before reclassifications: gains 43 58 — 1 102 Amounts reclassified from AOCI: (gains) losses (1) (23 ) (28 ) 13 — (38 ) Net current period other comprehensive income 20 30 13 1 64 Ending balance $ (260 ) $ 599 $ (1,069 ) $ (5 ) $ (735 ) (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 March 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 12 Operating revenue 2 Purchased gas (7 ) Electric fuel and other energy-related purchases Interest rate contracts 12 Interest and related charges Foreign currency contracts (8 ) Other income Total 11 Tax (3 ) Income tax expense Total, net of tax $ 8 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ 1 Other income Total 1 Tax — Income tax expense 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 31 Other income Total 26 Tax (1 ) Income tax expense Total, net of tax $ 25 Three Months Ended March 31, 2017 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ (62 ) Operating revenue (1 ) Purchased gas 1 Electric fuel and other energy-related purchases Interest rate contracts 11 Interest and related charges Foreign currency contracts 14 Other income Total (37 ) Tax 14 Income tax expense Total, net of tax $ (23 ) Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (53 ) Other income Impairment 9 Other income Total (44 ) Tax 16 Income tax expense Total, net of tax $ (28 ) Unrecognized pension and other postretirement benefit costs: Amortization of prior-service costs (credits) $ (4 ) Other income Amortization of actuarial losses 25 Other income Total 21 Tax (8 ) Income tax expense Total, net of tax $ 13
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 March 31, 2018 Beginning balance $ (12 ) $ 74 $ 62 Other comprehensive income before reclassifications: gains (losses) 5 — 5 Amounts reclassified from AOCI: (gains) losses — — — Net current period other comprehensive income (loss) 5 — 5 Cumulative-effect of changes in accounting principle (3 ) (73 ) (76 ) Ending balance $ (10 ) $ 1 $ (9 ) Three Months Ended March 31, 2017 Beginning balance $ (8 ) $ 54 $ 46 Other comprehensive income before reclassifications: gains — 7 7 Amounts reclassified from AOCI: (gains) (1) — (3 ) (3 ) Net current period other comprehensive income — 4 4 Ending balance $ (8 ) $ 58 $ 50 (1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents Virginia Power’s reclassifications out of AOCI by component: Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended March 31, 2017 Unrealized (gains) and losses on investment securities: Realized (gain) loss on sale of securities $ (6 ) Other income Impairment 1 Other income Total (5 ) Tax 2 Income tax expense Total, net of tax $ (3 )
Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents Dominion Energy Gas’ changes in AOCI by component, net of tax: Deferred gains and losses on derivatives- hedging activities Unrecognized pension costs Total (millions) Three Months Ended March 31, 2018 Beginning balance $ (23 ) $ (75 ) $ (98 ) Other comprehensive income before reclassifications: gains 13 — 13 Amounts reclassified from AOCI: (gains) losses (1) (3 ) 1 (2 ) Net current period other comprehensive income 10 1 11 Cumulative-effect of changes in accounting principle (5 ) (21 ) (26 ) Ending balance $ (18 ) $ (95 ) $ (113 ) Three Months Ended March 31, 2017 Beginning balance $ (24 ) $ (99 ) $ (123 ) Other comprehensive income before reclassifications: losses (9 ) — (9 ) Amounts reclassified from AOCI: losses (1) 11 — 11 Net current period other comprehensive income 2 — 2 Ending balance $ (22 ) $ (99 ) $ (121 ) (1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents Dominion Energy Gas' reclassifications out of AOCI by component: Details about AOCI components Amounts reclassified from AOCI Affected line item in the Consolidated Statements of Income (millions) Three Months Ended March 31, 2018 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 3 Operating revenue Interest rate contracts 1 Interest and related charges Foreign currency contracts (8 ) Other income Total (4 ) Tax 1 Income tax expense Total, net of tax $ (3 ) Unrecognized pension costs: Actuarial losses $ 2 Other income Total 2 Tax (1 ) Income tax expense Total, net of tax $ 1 Three Months Ended March 31, 2017 Deferred (gains) and losses on derivatives-hedging activities: Commodity contracts $ 3 Operating revenue Interest rate contracts 1 Interest and related charges Foreign currency contracts 14 Other income Total 18 Tax (7 ) Income tax expense Total, net of tax $ 11 Unrecognized pension costs: Actuarial losses $ 1 Other income Total 1 Tax (1 ) Income tax expense Total, net of tax $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Inputs, Assets, Quantitative Information	The following table presents Dominion Energy's quantitative information about Level 3 fair value measurements at March 31, 2018. 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 and futures: Natural gas (2) $ 83 Discounted cash flow Market price (per Dth) (3) (2) - 6 — FTRs 9 Discounted cash flow Market price (per MWh) (3) (1) - 6 1 Physical options: Natural gas 1 Option model Market price (per Dth) (3) 2 - 6 3 Price volatility (4) 14% - 29% 23 % Electricity 29 Option model Market price (per MWh) (3) 23 - 49 35 Price volatility (4) 7% - 63% 27 % Total assets $ 122 Liabilities Financial forwards: FTRs $ 2 Discounted cash flow Market price (per MWh) (3) (5) - 6 — Total liabilities $ 2 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets.
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable 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 March 31, 2018 Assets Derivatives: Commodity $ — $ 34 $ 122 $ 156 Interest rate — 44 — 44 Foreign currency — 44 — 44 Investments (1) Equity securities: U.S. 3,435 — — 3,435 Fixed income securities: Corporate debt instruments — 445 — 445 Government securities 302 811 — 1,113 Cash equivalents and other 12 — — 12 Total assets $ 3,749 $ 1,378 $ 122 $ 5,249 Liabilities Derivatives: Commodity $ — $ 29 $ 2 $ 31 Interest rate — 58 — 58 Foreign currency — 1 — 1 Total liabilities $ — $ 88 $ 2 $ 90 At December 31, 2017 Assets Derivatives: Commodity $ — $ 101 $ 157 $ 258 Interest rate — 17 — 17 Foreign currency — 32 — 32 Investments (1) Equity securities: U.S. 3,493 — — 3,493 Fixed income securities: Corporate debt instruments — 444 — 444 Government securities 307 794 — 1,101 Cash equivalents and other 34 — — 34 Total assets $ 3,834 $ 1,388 $ 157 $ 5,379 Liabilities Derivatives: Commodity $ — $ 190 $ 7 $ 197 Interest rate — 85 — 85 Foreign currency — 2 — 2 Total liabilities $ — $ 277 $ 7 $ 284 (1) Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $195 million and $88 million of assets at March 31, 2018 and December 31, 2017, 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 March 31, 2018 2017 (millions) Beginning balance $ 150 $ 139 Total realized and unrealized gains (losses): Included in earnings (18 ) (15 ) Included in other comprehensive income 1 — Included in regulatory assets/liabilities (21 ) (9 ) Settlements 7 12 Transfers out of Level 3 1 3 Ending balance $ 120 $ 130
Fair Value Unobservable Inputs Gain (Loss) Included In Earnings	The following table presents Dominion Energy’s classification of gains and losses included in earnings in the Level 3 fair value category. Operating Revenue Electric Fuel and Other Energy-Related Purchases Total (millions) Three Months Ended March 31, 2018 Total gains (losses) included in earnings $ (1 ) $ (17 ) $ (18 ) Three Months Ended March 31, 2017 Total gains (losses) included in earnings $ — $ (15 ) $ (15 )
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: March 31, 2018 December 31, 2017 Carrying Amount Estimated Fair Value (1) Carrying Amount Estimated Fair Value (1) (millions) Dominion Energy Long-term debt, including securities due within one year (2) $ 29,362 $ 31,044 $ 28,666 $ 31,233 Junior subordinated notes (3) 3,980 4,017 3,981 4,102 Remarketable subordinated notes (3) 1,381 1,299 1,379 1,446 Virginia Power Long-term debt, including securities due within one year (3) $ 11,690 $ 12,702 $ 11,346 $ 12,842 Dominion Energy Gas Long-term debt, including securities due within one year (4) $ 3,579 $ 3,657 $ 3,570 $ 3,719 (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 issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value. (2) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At March 31, 2018 and December 31, 2017, includes the valuation of certain fair value hedges associated with fixed rate debt of $(54) million and $(22) million, respectively. (3) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium. (4) Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.
Virginia Electric and Power Company
Fair Value Inputs, Assets, Quantitative Information	The following table presents Virginia Power's quantitative information about Level 3 fair value measurements at March 31, 2018. 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 and futures: Natural gas (2) $ 81 Discounted cash flow Market price (per Dth) (3) (2) - 6 (1 ) FTRs 8 Discounted cash flow Market price (per MWh) (3) (1) - 6 1 Physical options: Natural gas 1 Option model Market price (per Dth) (3) 2 - 6 3 Price volatility (4) 14% - 29% 23 % Electricity 29 Option model Market price (per MWh) (3) 23 - 49 35 Price volatility (4) 7% - 63% 27 % Total assets $ 119 Liabilities Financial forwards: FTRs $ 2 Discounted cash flow Market price (per MWh) (3) (5) - 6 — Total liabilities $ 2 (1) Averages weighted by volume. (2) Includes basis. (3) Represents market prices beyond defined terms for Levels 1 and 2. (4) Represents volatilities unrepresented in published markets .
Fair Value, Option, Qualitative Disclosures	Sensitivity of the fair value measurements to changes in the significant unobservable inputs is as follows: Significant Unobservable 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 March 31, 2018 Assets Derivatives: Commodity $ — $ 4 $ 119 $ 123 Interest rate — 6 — 6 Investments (1) Equity securities: U.S. 1,539 — — 1,539 Fixed income securities: Corporate debt instruments — 221 — 221 Government securities 173 327 — 500 Cash equivalents and other 3 — — 3 Total assets $ 1,715 $ 558 $ 119 $ 2,392 Liabilities Derivatives: Commodity $ — $ 7 $ 2 $ 9 Interest rate — 14 — 14 Total liabilities $ — $ 21 $ 2 $ 23 At December 31, 2017 Assets Derivatives: Commodity $ — $ 14 $ 152 $ 166 Investments (1) Equity securities: U.S. 1,566 — — 1,566 Fixed income securities: Corporate debt instruments — 224 — 224 Government securities 168 326 — 494 Cash equivalents and other 16 — — 16 Total assets $ 1,750 $ 564 $ 152 $ 2,466 Liabilities Derivatives: Commodity $ — $ 4 $ 5 $ 9 Interest rate — 57 — 57 Total liabilities $ — $ 61 $ 5 $ 66 (1) Includes investments held in the nuclear decommissioning trusts. Excludes $135 million and $27 million of assets at March 31, 2018 and December 31, 2017, 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 March 31, 2018 2017 (millions) Beginning balance $ 147 $ 143 Total realized and unrealized losses: Included in earnings (17 ) (15 ) Included in regulatory assets/liabilities (19 ) (8 ) Settlements 6 12 Ending balance $ 117 $ 132
Dominion Energy Gas Holdings, LLC
Fair Value, by Balance Sheet Grouping	The following table presents Dominion Energy Gas' assets and liabilities for derivatives that are measured at fair value on a recurring basis for each hierarchy level, including both current and noncurrent portions. Level 1 Level 2 Level 3 Total (millions) At March 31, 2018 Assets Foreign currency $ — $ 44 $ — $ 44 Total assets $ — $ 44 $ — $ 44 Liabilities Foreign currency $ — $ 1 $ — $ 1 Total liabilities $ — $ 1 $ — $ 1 At December 31, 2017 Assets Foreign currency $ — $ 32 $ — $ 32 Total assets $ — $ 32 $ — $ 32 Liabilities Commodity $ — $ 4 $ 2 $ 6 Foreign currency — 2 — 2 Total liabilities $ — $ 6 $ 2 $ 8
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the net change in Dominion Energy Gas' assets and liabilities for derivatives measured at fair value on a recurring basis and included in the Level 3 fair value category. Three Months Ended March 31, 2018 2017 (millions) Beginning balance $ (2 ) $ (2 ) Total realized and unrealized gains (losses): Included in other comprehensive income (loss) 1 (1 ) Transfers out of Level 3 1 3 Ending balance $ — $ —

Derivatives and Hedge Account36

Derivatives and Hedge Accounting Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Offsetting Assets	The tables below present Dominion Energy's derivative asset and liability balances by type of financial instrument, before and after the effects of offsetting: March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 132 $ — $ 132 $ 174 $ — $ 174 Exchange 20 — 20 80 — 80 Interest rate contracts: Over-the-counter 44 — 44 17 — 17 Foreign currency contracts: Over-the-counter 44 — 44 32 — 32 Total derivatives, subject to a master netting or similar arrangement 240 — 240 303 — 303 Total derivatives, not subject to a master netting or similar arrangement 4 — 4 4 — 4 Total $ 244 $ — $ 244 $ 307 $ — $ 307 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 132 $ 5 $ — $ 127 $ 174 $ 9 $ — $ 165 Exchange 20 19 — 1 80 80 — — Interest rate contracts: Over-the-counter 44 9 — 35 17 8 — 9 Foreign currency contracts: Over-the-counter 44 1 — 43 32 2 — 30 Total $ 240 $ 34 $ — $ 206 $ 303 $ 99 $ — $ 204
Offsetting Liabilities	March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 12 $ — $ 12 $ 76 $ — $ 76 Exchange 19 — 19 120 — 120 Interest rate contracts: Over-the-counter 58 — 58 85 — 85 Foreign currency contracts: Over-the-counter 1 — 1 2 — 2 Total derivatives, subject to a master netting or similar arrangement 90 — 90 283 — 283 Total derivatives, not subject to a master netting or similar arrangement — — — 1 — 1 Total $ 90 $ — $ 90 $ 284 $ — $ 284 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 12 $ 5 $ — $ 7 $ 76 $ 9 $ 6 $ 61 Exchange 19 19 — — 120 80 40 — Interest rate contracts: Over-the-counter 58 9 — 49 85 8 — 77 Foreign currency contracts: Over-the-counter 1 1 — — 2 2 — — Total $ 90 $ 34 $ — $ 56 $ 283 $ 99 $ 46 $ 138
Schedule of Volume of Derivative Activity	The following table presents the volume of Dominion Energy’s derivative activity at March 31, 2018. 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) 70 24 Basis 233 600 Electricity (MWh): Fixed price (1) 9,637,759 919,920 FTRs 19,630,088 — Liquids (Gal) (2) 60,630,000 — Interest rate (3) $ 1,400,000,000 $ 4,790,445,562 Foreign currency (3)(4) $ — $ 280,000,000 (1) Includes options. (2) Includes NGLs and oil. (3) Maturity is determined based on final settlement period. (4) Euro equivalent volumes are €250,000,000.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy’s Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Commodities: Gas $ (3 ) $ (2 ) 31 months Electricity 6 5 20 months Interest rate (262 ) (10 ) 381 months Foreign currency 11 (1 ) 99 months Total $ (248 ) $ (8 )
Fair Value of Derivatives	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) March 31, 2018 ASSETS Current Assets Commodity $ 17 $ 61 $ 78 Interest rate 16 — 16 Total current derivative assets (1) 33 61 94 Noncurrent Assets Commodity 1 77 78 Interest rate 28 — 28 Foreign currency 44 — 44 Total noncurrent derivative assets (2) 73 77 150 Total derivative assets $ 106 $ 138 $ 244 LIABILITIES Current Liabilities Commodity $ 12 $ 17 $ 29 Interest rate 19 — 19 Foreign currency 1 — 1 Total current derivative liabilities (3) 32 17 49 Noncurrent Liabilities Commodity 1 1 2 Interest rate 39 — 39 Total noncurrent derivative liabilities (4) 40 1 41 Total derivative liabilities $ 72 $ 18 $ 90 December 31, 2017 ASSETS Current Assets Commodity $ 5 $ 158 $ 163 Interest rate 6 — 6 Total current derivative assets (1) 11 158 169 Noncurrent Assets Commodity — 95 95 Interest rate 11 — 11 Foreign currency 32 — 32 Total noncurrent derivative assets (2) 43 95 138 Total derivative assets $ 54 $ 253 $ 307 LIABILITIES Current Liabilities Commodity 103 92 195 Interest rate 53 — 53 Foreign currency 2 — 2 Total current derivative liabilities (3) 158 92 250 Noncurrent Liabilities Commodity 1 1 2 Interest rate 32 — 32 Total noncurrent derivative liabilities (4) 33 1 34 Total derivative liabilities $ 191 $ 93 $ 284 (1) Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets. (2) Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets. (3) Current derivative liabilities are presented in other current liabilities in Dominion Energy's Consolidated Balance Sheets. (4) Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables present the gains and losses on Dominion Energy's derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended March 31, 2018 Derivative type and location of gains (losses): Commodity: Operating revenue $ (12 ) Purchased gas (2 ) Electric fuel and other energy-related purchases 7 Total commodity $ 97 $ (7 ) $ — Interest rate (3) 38 (12 ) 68 Foreign currency (4) 13 8 — Total $ 148 $ (11 ) $ 68 Three Months Ended March 31, 2017 Derivative type and location of gains (losses): Commodity: Operating revenue $ 62 Purchased gas 1 Electric fuel and other energy-related purchases (1 ) Total commodity $ 87 $ 62 $ — Interest rate (3) 1 (11 ) 8 Foreign currency (4) (18 ) (14 ) — Total $ 70 $ 37 $ 8 (1) Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income. (2) Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income. (3) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges. (4) Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
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 March 31, 2018 2017 (millions) Derivative type and location of gains (losses): Commodity: Operating revenue $ 6 $ 4 Purchased gas — 16 Electric fuel and other energy-related purchases (13 ) (23 ) Other operations & maintenance — (1 ) Total $ (7 ) $ (4 ) (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, before and after the effects of offsetting: March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 118 $ — $ 118 $ 155 $ — $ 155 Interest rate contracts: Over-the-counter 6 — 6 — — — Total derivatives, subject to a master netting or similar arrangement 124 — 124 155 — 155 Total derivatives, not subject to a master netting or similar arrangement 5 — 5 11 — 11 Total $ 129 $ — $ 129 $ 166 $ — $ 166 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Commodity contracts: Over-the-counter $ 118 $ 2 $ — $ 116 $ 155 $ 4 $ — $ 151 Interest rate contracts: Over-the-counter 6 3 — 3 — — — — Total $ 124 $ 5 $ — $ 119 $ 155 $ 4 $ — $ 151
Offsetting Liabilities	March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ 2 $ — $ 2 $ 4 $ — $ 4 Interest rate contracts: Over-the-counter 14 — 14 57 — 57 Total derivatives, subject to a master netting or similar arrangement 16 — 16 61 — 61 Total derivatives, not subject to a master netting or similar arrangement 7 — 7 5 — 5 Total $ 23 $ — $ 23 $ 66 $ — $ 66 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts: Over-the-counter $ 2 $ 2 $ — $ — $ 4 $ 4 $ — $ — Interest rate contracts: Over-the-counter 14 3 — 11 57 — — 57 Total $ 16 $ 5 $ — $ 11 $ 61 $ 4 $ — $ 57
Schedule of Volume of Derivative Activity	The following table presents the volume of Virginia Power’s derivative activity at March 31, 2018. 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) 21 4 Basis 132 532 Electricity (MWh): Fixed price (1) 1,445,264 — FTRs 17,179,279 — Interest rate (2) $ 600,000,000 $ 900,000,000 (1) Includes options. (2) Maturity is determined based on final settlement period.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to losses on cash flow hedges included in AOCI in Virginia Power’s Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate $ (10 ) $ (1 ) 381 months Total $ (10 ) $ (1 )
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) March 31, 2018 ASSETS Current Assets Commodity $ — $ 48 $ 48 Interest rate 2 — 2 Total current derivative assets (1) 2 48 50 Noncurrent Assets Commodity — 75 75 Interest rate 4 — 4 Total noncurrent derivative assets (2) 4 75 79 Total derivative assets $ 6 $ 123 $ 129 LIABILITIES Current Liabilities Commodity $ — $ 9 $ 9 Interest rate 11 — 11 Total current derivative liabilities (3) 11 9 20 Noncurrent Liabilities Interest rate 3 — 3 Total noncurrent derivatives liabilities (4) 3 — 3 Total derivative liabilities $ 14 $ 9 $ 23 December 31, 2017 ASSETS Current Assets Commodity $ — $ 75 $ 75 Total current derivative assets (1) — 75 75 Noncurrent Assets Commodity — 91 91 Total noncurrent derivative assets (2) — 91 91 Total derivative assets $ — $ 166 $ 166 LIABILITIES Current Liabilities Commodity $ — $ 9 $ 9 Interest rate 44 — 44 Total current derivative liabilities (3) 44 9 53 Noncurrent Liabilities Interest rate 13 — 13 Total noncurrent derivatives liabilities (4) 13 — 13 Total derivative liabilities $ 57 $ 9 $ 66 (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) Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets. (4) 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 (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income Increase (Decrease) in Derivatives Subject to Regulatory Treatment (2) (millions) Three Months Ended March 31, 2018 Derivative type and location of gains (losses): Interest rate (3) $ 7 $ — $ 68 Total $ 7 $ — $ 68 Three Months Ended March 31, 2017 Derivative type and location of gains (losses): Interest rate (3) $ — $ — $ 8 Total $ — $ — $ 8 (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 March 31, 2018 2017 (millions) Derivative type and location of gains (losses): Commodity (2) $ — $ (17 ) Total $ — $ (17 ) (1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income. (2) Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.
Dominion Energy Gas Holdings, LLC
Offsetting Assets	The tables below present Dominion Energy Gas' derivative asset and liability balances by type of financial instrument, before and after the effects of offsetting. March 31, 2018 December 31, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet (millions) Foreign currency contracts: Over-the-counter $ 44 $ — $ 44 $ 32 $ — $ 32 Total derivatives, subject to a master netting or similar arrangement $ 44 $ — $ 44 $ 32 $ — $ 32 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amounts (millions) Foreign currency contracts: Over-the-counter $ 44 $ 1 $ — $ 43 $ 32 $ 2 $ — $ 30 Total $ 44 $ 1 $ — $ 43 $ 32 $ 2 $ — $ 30
Offsetting Liabilities	March 31, 2018 December 31, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet (millions) Commodity contracts: Over-the-counter $ — $ — $ — $ 6 $ — $ 6 Foreign currency contracts: Over-the-counter 1 — 1 2 — 2 Total derivatives, subject to a master netting or similar arrangement $ 1 $ — $ 1 $ 8 $ — $ 8 March 31, 2018 December 31, 2017 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts Not Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Paid Net Amounts (millions) Commodity contracts Over-the-counter $ — $ — $ — $ — $ 6 $ — $ — $ 6 Foreign currency contracts: Over-the-counter 1 1 — — 2 2 — — Total $ 1 $ 1 $ — $ — $ 8 $ 2 $ — $ 6
Schedule of Volume of Derivative Activity	The following table presents the volume of Dominion Energy Gas' derivative activity at March 31, 2018. 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 NGLs (Gal) 55,254,000 — Foreign currency (1) $ — $ 280,000,000 (1) Maturity is determined based on final settlement period. Euro equivalent volumes are €250,000,000.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents selected information related to gains (losses) on cash flow hedges included in AOCI in Dominion Energy Gas' Consolidated Balance Sheet at March 31, 2018: AOCI After-Tax Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax Maximum Term (millions) Interest rate (29 ) (3 ) 321 months Foreign currency 11 (1 ) 99 months Total $ (18 ) $ (4 )
Fair Value of Derivatives	The following tables present the fair values of Dominion Energy Gas' 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) March 31, 2018 ASSETS Noncurrent Assets Foreign currency $ 44 $ — $ 44 Total noncurrent derivative assets (1) 44 — 44 Total derivative assets $ 44 $ — $ 44 LIABILITIES Current Liabilities Foreign currency $ 1 $ — $ 1 Total current derivative liabilities (2) 1 — 1 Total derivative liabilities $ 1 $ — $ 1 December 31, 2017 ASSETS Noncurrent Assets Foreign currency $ 32 $ — $ 32 Total noncurrent derivative assets (1) 32 — 32 Total derivative assets $ 32 $ — $ 32 LIABILITIES Current Liabilities Commodity $ 6 $ — $ 6 Foreign currency 2 — 2 Total current derivative liabilities (2) 8 — 8 Total derivative liabilities $ 8 $ — $ 8 (1) Noncurrent derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets. (2) Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following table presents the gains and losses on Dominion Energy Gas' derivatives, as well as where the associated activity is presented in its Consolidated Balance Sheets and Statements of Income: Derivatives in cash flow hedging relationships Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) (1) Amount of Gain (Loss) Reclassified From AOCI to Income (millions) Three Months Ended March 31, 2018 Derivative Type and Location of Gains (Losses): Commodity: Operating revenue $ (3 ) Total commodity $ 4 $ (3 ) Interest rate (2) — (1 ) Foreign currency (3) 13 8 Total $ 17 $ 4 Three Months Ended March 31, 2017 Derivative Type and Location of Gains (Losses): Commodity: Operating revenue $ (3 ) Total commodity $ 2 $ (3 ) Interest rate (2) — (1 ) Foreign currency (3) (18 ) (14 ) Total $ (16 ) $ (18 ) (1) Amounts deferred into AOCI have no associated effect in Dominion Energy Gas' Consolidated Statements of Income. (2) Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in interest and related charges. (3) Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in other income.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Available-For-Sale Securities	Dominion Energy’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) March 31, 2018 Equity securities: (1) U.S. $ 1,676 $ 1,824 $ (15 ) $ 3,485 Fixed income securities: (2) Corporate debt instruments 442 9 (6 ) 445 Government securities 1,061 17 (12 ) 1,066 Common/collective trust funds 56 — — 56 Cash equivalents and other (4) 8 — — 8 Total $ 3,243 $ 1,850 $ (33 ) (3) $ 5,060 December 31, 2017 Equity securities: (2) U.S. $ 1,569 $ 1,857 $ — $ 3,426 Fixed income securities: (2) Corporate debt instruments 430 15 (1 ) 444 Government securities 1,039 27 (5 ) 1,061 Common/collective trust funds 60 — — 60 Cost method investments 68 — — 68 Cash equivalents and other (4) 34 — — 34 Total $ 3,200 $ 1,899 $ (6 ) (3) $ 5,093 (1) Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2 . (3) The fair value of securities in an unrealized loss position was $1.1 billion and $565 million (4) Includes pending sales of securities of $3 million and
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: March 31, 2018 (millions) Net losses recognized during the period $ (65 ) Less: Net gains recognized during the period on securities sold during the period (19 ) Unrealized losses recognized during the period on securities still held at March 31, 2018 (1) $ (84 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Investments Classified by Contractual Maturity Date	The fair value of Dominion Energy’s debt securities with readily determinable fair values held in nuclear decommissioning trust funds at March 31, 2018 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 165 Due after one year through five years 375 Due after five years through ten years 375 Due after ten years 652 Total $ 1,567
Marketable Securities	Presented below is selected information regarding Dominion Energy’s equity and debt securities with readily determinable fair values held in nuclear decommissioning trust funds. Three Months Ended March 31, 2018 2017 (millions) Proceeds from sales $ 419 $ 756 Realized gains (1) 36 94 Realized losses (1) 19 20 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.
Virginia Electric and Power Company
Available-For-Sale Securities	Virginia Power’s decommissioning trust funds are summarized below: Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value (millions) March 31, 2018 Equity securities: (1) U.S. $ 828 $ 829 $ (9 ) $ 1,648 Fixed income securities: (2) Corporate debt instruments 219 4 (2 ) 221 Government securities 496 8 (5 ) 499 Common/collective trust funds 25 — — 25 Cash equivalents and other (4) 7 — — 7 Total $ 1,575 $ 841 $ (16 ) (3) $ 2,400 December 31, 2017 Equity securities: (2) U.S. $ 734 $ 831 $ — $ 1,565 Fixed income securities: (2) Corporate debt instruments 216 8 — 224 Government securities 482 13 (2 ) 493 Common/collective trust funds 27 — — 27 Cost method investments 68 — — 68 Cash equivalents and other (4) 22 — — 22 Total $ 1,549 $ 852 $ (2 ) (3) $ 2,399 (1) Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. (2) Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2 . (3) The fair value of securities in an unrealized loss position was $ (4) Includes pending sales of securities of $4 million and
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: March 31, 2018 (millions) Net losses recognized during the period $ (32 ) Less: Net gains recognized during the period on securities sold during the period (15 ) Unrealized losses recognized during the period on securities still held at March 31, 2018 (1) $ (47 ) (1) Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
Investments Classified by Contractual Maturity Date	The fair value of Virginia Power’s debt securities with readily determinable fair values held in nuclear decommissioning trust funds at March 31, 2018 by contractual maturity is as follows: Amount (millions) Due in one year or less $ 43 Due after one year through five years 155 Due after five years through ten years 208 Due after ten years 339 Total $ 745
Marketable Securities	Presented below is selected information regarding Virginia Power’s equity and debt securities with readily determinable fair values held in nuclear decommissioning trust funds. Three Months Ended March 31, 2018 2017 (millions) Proceeds from sales $ 218 $ 330 Realized gains (1) 18 45 Realized losses (1) 5 10 (1) Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

Regulatory Assets and Liabili38

Regulatory Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Regulatory Assets And Liabilities Disclosure [Abstract]
Schedule of Regulatory Assets	Regulatory assets and liabilities include the following: March 31, 2018 December 31, 2017 (millions) Dominion Energy Regulatory assets: Deferred rate adjustment clause costs (1) $ 78 $ 70 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Unrecovered gas costs (4) 5 38 Other 107 109 Regulatory assets-current (5) 263 294 Unrecognized pension and other postretirement benefit costs (6) 1,316 1,336 Deferred rate adjustment clause costs (1) 357 401 Deferred cost of fuel used in electric generation (3) 322 — PJM transmission rates (7) 229 222 Utility reform legislation (8) 160 147 Derivatives (9) 157 223 Other 157 151 Regulatory assets-noncurrent 2,698 2,480 Total regulatory assets $ 2,961 $ 2,774 Regulatory liabilities: Reserve for rate credits to electric utility customers (10) $ 200 $ — Provision for future cost of removal and AROs (11) 101 101 PIPP (12) 9 20 Other 98 72 Regulatory liabilities-current (13) 408 193 Income taxes refundable through future rates (14) 4,047 4,058 Provision for future cost of removal and AROs (11) 1,395 1,384 Nuclear decommissioning trust (15) 1,113 1,121 Cost-of-service impact of 2017 Tax Reform Act (16) 56 — Other 366 353 Regulatory liabilities-noncurrent 6,977 6,916 Total regulatory liabilities $ 7,385 $ 7,109 Virginia Power Regulatory assets: Deferred rate adjustment clause costs (1) $ 75 $ 56 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Other 76 72 Regulatory assets-current (5) 224 205 Deferred cost of fuel used in electric generation (3) 322 — Deferred rate adjustment clause costs (1) 255 312 PJM transmission rates (7) 229 222 Derivatives (9) 124 190 Other 79 86 Regulatory assets-noncurrent 1,009 810 Total regulatory assets $ 1,233 $ 1,015 Regulatory liabilities: Reserve for rate credits to customers (10) $ 200 $ — Provision for future cost of removal (11) 80 80 Deferred cost of fuel used in electric generation (3) 4 8 Other 20 39 Regulatory liabilities-current 304 127 Income taxes refundable through future rates (14) 2,575 2,581 Nuclear decommissioning trust (15) 1,113 1,121 Provision for future cost of removal (11) 922 915 Derivatives (9) 63 69 Cost-of-service impact of 2017 Tax Reform Act (16) 39 — Other 84 74 Regulatory liabilities-noncurrent 4,796 4,760 Total regulatory liabilities $ 5,100 $ 4,887 Dominion Energy Gas Regulatory assets: Deferred rate adjustment clause costs (1) $ 3 $ 14 Unrecovered gas costs (4) — 8 Other 3 4 Regulatory assets-current (5) 6 26 Unrecognized pension and other postretirement benefit costs (6) 255 258 Utility reform legislation (8) 160 147 Deferred rate adjustment clause costs (1) 102 89 Other 23 17 Regulatory assets-noncurrent (17) 540 511 Total regulatory assets $ 546 $ 537 Regulatory liabilities: Provision for future cost of removal and AROs (11) $ 13 $ 13 PIPP (12) 9 20 Other 20 5 Regulatory liabilities-current (13) 42 38 Income taxes refundable through future rates (14) 995 998 Provision for future cost of removal and AROs (15) 161 160 Cost-of-service impact of 2017 Tax Reform Act (16) 9 — Other 78 69 Regulatory liabilities-noncurrent (18) 1,243 1,227 Total regulatory liabilities $ 1,285 $ 1,265 (1) Primarily reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power and deferrals of costs associated with certain current and prospective rider projects for Dominion Energy Gas. See Note 13 for more information. (2) 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. (3) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion Energy's and Virginia Power's generation operations. (4) Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority. (5) Current regulatory assets are presented in other current assets in the Companies’ Consolidated Balance Sheets. (6) 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 and Dominion Energy Gas' rate-regulated subsidiaries. (7) Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more information. (8) Ohio legislation under House Bill 95, which became effective in September 2011. This law updates natural gas legislation by enabling gas companies to include more up-to-date cost levels when filing rate cases. It also allows gas companies to seek approval of capital expenditure plans under which gas companies can recognize carrying costs on associated capital investments placed in service and can defer the carrying costs plus depreciation and property tax expenses for recovery from ratepayers in the future. (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) Charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers. See Note 13 for more information. (11) Rates charged to customers by the Companies' 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. (12) Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions. (13) Current regulatory liabilities are presented in other current liabilities in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets. (14) 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. (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) 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 Note 13 for more information. (17) Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets. (18) Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
Schedule of Regulatory Liabilities	Regulatory assets and liabilities include the following: March 31, 2018 December 31, 2017 (millions) Dominion Energy Regulatory assets: Deferred rate adjustment clause costs (1) $ 78 $ 70 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Unrecovered gas costs (4) 5 38 Other 107 109 Regulatory assets-current (5) 263 294 Unrecognized pension and other postretirement benefit costs (6) 1,316 1,336 Deferred rate adjustment clause costs (1) 357 401 Deferred cost of fuel used in electric generation (3) 322 — PJM transmission rates (7) 229 222 Utility reform legislation (8) 160 147 Derivatives (9) 157 223 Other 157 151 Regulatory assets-noncurrent 2,698 2,480 Total regulatory assets $ 2,961 $ 2,774 Regulatory liabilities: Reserve for rate credits to electric utility customers (10) $ 200 $ — Provision for future cost of removal and AROs (11) 101 101 PIPP (12) 9 20 Other 98 72 Regulatory liabilities-current (13) 408 193 Income taxes refundable through future rates (14) 4,047 4,058 Provision for future cost of removal and AROs (11) 1,395 1,384 Nuclear decommissioning trust (15) 1,113 1,121 Cost-of-service impact of 2017 Tax Reform Act (16) 56 — Other 366 353 Regulatory liabilities-noncurrent 6,977 6,916 Total regulatory liabilities $ 7,385 $ 7,109 Virginia Power Regulatory assets: Deferred rate adjustment clause costs (1) $ 75 $ 56 Deferred nuclear refueling outage costs (2) 57 54 Deferred cost of fuel used in electric generation (3) 16 23 Other 76 72 Regulatory assets-current (5) 224 205 Deferred cost of fuel used in electric generation (3) 322 — Deferred rate adjustment clause costs (1) 255 312 PJM transmission rates (7) 229 222 Derivatives (9) 124 190 Other 79 86 Regulatory assets-noncurrent 1,009 810 Total regulatory assets $ 1,233 $ 1,015 Regulatory liabilities: Reserve for rate credits to customers (10) $ 200 $ — Provision for future cost of removal (11) 80 80 Deferred cost of fuel used in electric generation (3) 4 8 Other 20 39 Regulatory liabilities-current 304 127 Income taxes refundable through future rates (14) 2,575 2,581 Nuclear decommissioning trust (15) 1,113 1,121 Provision for future cost of removal (11) 922 915 Derivatives (9) 63 69 Cost-of-service impact of 2017 Tax Reform Act (16) 39 — Other 84 74 Regulatory liabilities-noncurrent 4,796 4,760 Total regulatory liabilities $ 5,100 $ 4,887 Dominion Energy Gas Regulatory assets: Deferred rate adjustment clause costs (1) $ 3 $ 14 Unrecovered gas costs (4) — 8 Other 3 4 Regulatory assets-current (5) 6 26 Unrecognized pension and other postretirement benefit costs (6) 255 258 Utility reform legislation (8) 160 147 Deferred rate adjustment clause costs (1) 102 89 Other 23 17 Regulatory assets-noncurrent (17) 540 511 Total regulatory assets $ 546 $ 537 Regulatory liabilities: Provision for future cost of removal and AROs (11) $ 13 $ 13 PIPP (12) 9 20 Other 20 5 Regulatory liabilities-current (13) 42 38 Income taxes refundable through future rates (14) 995 998 Provision for future cost of removal and AROs (15) 161 160 Cost-of-service impact of 2017 Tax Reform Act (16) 9 — Other 78 69 Regulatory liabilities-noncurrent (18) 1,243 1,227 Total regulatory liabilities $ 1,285 $ 1,265 (1) Primarily reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power and deferrals of costs associated with certain current and prospective rider projects for Dominion Energy Gas. See Note 13 for more information. (2) 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. (3) Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion Energy's and Virginia Power's generation operations. (4) Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority. (5) Current regulatory assets are presented in other current assets in the Companies’ Consolidated Balance Sheets. (6) 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 and Dominion Energy Gas' rate-regulated subsidiaries. (7) Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more information. (8) Ohio legislation under House Bill 95, which became effective in September 2011. This law updates natural gas legislation by enabling gas companies to include more up-to-date cost levels when filing rate cases. It also allows gas companies to seek approval of capital expenditure plans under which gas companies can recognize carrying costs on associated capital investments placed in service and can defer the carrying costs plus depreciation and property tax expenses for recovery from ratepayers in the future. (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) Charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers. See Note 13 for more information. (11) Rates charged to customers by the Companies' 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. (12) Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions. (13) Current regulatory liabilities are presented in other current liabilities in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets. (14) 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. (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) 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 Note 13 for more information. (17) Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets. (18) Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.

Significant Financing Transac39

Significant Financing Transactions (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Schedule of Line of Credit Facilities	In March 2018, Dominion Energy replaced its two existing joint revolving credit facilities with a $6.0 billion joint revolving credit facility. At March 31, 2018, 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 $ 2,712 $ 72 $ 3,216 (1) This credit facility matures in March 2023 and can be used by the Companies 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 March 31, 2018, Virginia Power’s share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Dominion Energy Gas and Questar Gas was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 6,000 $ 426 $ 1 (1) The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
Dominion Energy Gas Holdings, LLC
Debt Instrument [Line Items]
Schedule of Line of Credit Facilities	At March 31, 2018, Dominion Energy Gas' share of commercial paper and letters of credit outstanding under its joint credit facility with Dominion Energy, Virginia Power and Questar Gas was as follows: Facility Limit (1) Outstanding Commercial Paper Outstanding Letters of Credit (millions) Joint revolving credit facility (1) $ 1,500 $ 614 $ — (1) A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule Of Subsidiary Guarantees	At March 31, 2018, Dominion Energy had issued the following subsidiary guarantees: Maximum Exposure (millions) Commodity transactions (1) $ 2,149 Nuclear obligations (2) 228 Cove Point (3) 1,900 Solar (4) 942 Other (5) 551 Total (6) $ 5,770 (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 related to certain DGI subsidiaries regarding all aspects of running a nuclear facility. (3) Guarantees related to Cove Point, in support of terminal services, transportation and construction. Cove Point has two guarantees that have no maximum limit and, therefore, are not included in this amount. (4) Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects. (5) Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of March 31, 2018, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $10 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $6 million. (6) Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2017.

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2018
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Schedule of Related Party Transactions	Presented below are Virginia Power's significant transactions with DES and other affiliates: Three Months Ended March 31, 2018 2017 (millions) Commodity purchases from affiliates $ 398 $ 212 Services provided by affiliates (1) 120 112 Services provided to affiliates 6 5 (1) Includes capitalized expenditures of $37 million and $34 million for the three months ended March 31, 2018 and 2017, respectively.
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Schedule of Related Party Transactions	Management believes the assumptions and methodologies underlying the allocation of general corporate overhead expenses are reasonable. Three Months Ended March 31, 2018 2017 (millions) Sales of natural gas and transportation and storage services to affiliates $ 18 $ 18 Purchases of natural gas and transportation and storage services from affiliates 3 — Services provided by related parties (1) 33 35 Services provided to related parties (2) 52 39 (1) Includes capitalized expenditures of $10 million and $8 million for the three months ended March 31, 2018 and 2017, respectively. (2) Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE. The following table presents affiliated and related party balances reflected in Dominion Energy Gas' Consolidated Balance Sheets: March 31, 2018 December 31, 2017 (millions) Other receivables (1) $ 17 $ 12 Customer receivables from related parties — 1 Imbalances receivable from affiliates (2) — 1 Affiliated notes receivable (3) 19 20 (1) Represents amounts due from Atlantic Coast Pipeline, a related-party VIE. (2) Amounts are presented in other current assets in Dominion Energy Gas' Consolidated Balance Sheets. (3) Amounts are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost (Credit)	The components of Dominion Energy's provision for net periodic benefit cost (credit) were as follows: Pension Benefits Other Postretirement Benefits 2018 2017 2018 2017 (millions) Three Months Ended March 31, Service cost $ 39 $ 35 $ 7 $ 7 Interest cost 84 86 14 16 Expected return on plan assets (165 ) (159 ) (36 ) (32 ) Amortization of prior service credit — — (13 ) (12 ) Amortization of net actuarial loss 48 40 3 3 Settlements — 1 — — Net periodic benefit cost (credit) (1) $ 6 $ 3 $ (25 ) $ (18 ) (1) The components of net periodic benefit cost (credit) other than the service cost component are included in other income in the Consolidated Statements of Income.
Dominion Energy Gas Holdings, LLC
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost (Credit)	The components of Dominion Energy Gas' provision for net periodic benefit cost (credit) for employees represented by collective bargaining units were as follows: Pension Benefits Other Postretirement Benefits 2018 2017 2018 2017 (millions) Three Months Ended March 31, Service cost $ 4 $ 4 $ 1 $ 1 Interest cost 7 7 3 3 Expected return on plan assets (37 ) (35 ) (8 ) (6 ) Amortization of prior service credit — — (1 ) — Amortization of net actuarial loss 5 4 1 1 Net periodic benefit credit (1) $ (21 ) $ (20 ) $ (4 ) $ (1 ) (1) The components of net periodic benefit credit other than the service cost component are included in other income in the Consolidated Statements of Income.

Operating Segments (Tables)

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting Information [Line Items]
Segment Reporting Disclosure Other Information	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 Gas Power Delivery Regulated electric distribution X X Regulated electric transmission X X Power Generation Regulated electric fleet X X Merchant electric fleet X Gas Infrastructure Gas transmission and storage X X Gas distribution and storage X X Gas gathering and processing X X LNG terminalling and storage X Nonregulated retail energy marketing X
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Dominion Energy’s operations: Power Delivery Power Generation Gas Infrastructure Corporate and Other Adjustments/ Eliminations Consolidated Total (millions) Three Months Ended March 31, 2018 Total revenue from external customers $ 563 $ 1,860 $ 1,222 $ (207 ) $ 28 $ 3,466 Intersegment revenue 6 2 6 175 (189 ) — Total operating revenue 569 1,862 1,228 (32 ) (161 ) 3,466 Net income (loss) attributable to Dominion Energy 156 348 327 (328 ) — 503 Three Months Ended March 31, 2017 Total revenue from external customers $ 554 $ 1,653 $ 901 $ 3 $ 273 $ 3,384 Intersegment revenue 5 3 266 152 (426 ) — Total operating revenue 559 1,656 1,167 155 (153 ) 3,384 Net income (loss) attributable to Dominion Energy 125 261 263 (17 ) — 632
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: Power Delivery Power Generation Corporate and Other Consolidated Total (millions) Three Months Ended March 31, 2018 Operating revenue $ 563 $ 1,400 $ (215 ) $ 1,748 Net income (loss) 154 222 (192 ) 184 Three Months Ended March 31, 2017 Operating revenue $ 557 $ 1,274 $ — $ 1,831 Net income 125 223 8 356
Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following table presents segment information pertaining to Dominion Energy Gas' operations: Gas Infrastructure Corporate Other Consolidated Total (millions) Three Months Ended March 31, 2018 Operating revenue $ 526 $ — $ 526 Net income (loss) 167 (1 ) 166 Three Months Ended March 31, 2017 Operating revenue $ 490 $ — $ 490 Net income (loss) 109 (1 ) 108

Significant Accounting Polici44

Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)Contract$ / shares	Mar. 31, 2017USD ($)
Significant Accounting Policies [Line Items]
Payments for sales and services due period		1 month
Cash provided by other investing activities		$ 4	$ 4
Operating Revenue	[1]	3,466	3,384
Other energy-related purchases		744	575
Purchased gas		340	305
Unrealized gains reclassified from AOCI to retained earnings		1,100
Unrealized gains reclassified from AOCI to retained earnings after-tax		734
Unrealized gain (loss) on securities recorded in other income, before tax	[2]	$ (84)
Loss per share from unrealized lLoss on securities | $ / shares		$ 0.06
Other operations and maintenance		$ 796	784
Other income		100	162
Tax reform, reclassification of tax expense (benefit) from AOCI to retained earnings		(289)
Accounting Standards Update 2014-09 [Member] | Performing Processing And Fractionation Services
Significant Accounting Policies [Line Items]
Operating Revenue		25	0
Other energy-related purchases		25	0
Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements
Significant Accounting Policies [Line Items]
Operating Revenue			(32)
Purchased gas			(32)
Accounting Standards Update 2016-01 [Member]
Significant Accounting Policies [Line Items]
Unrealized gain (loss) on securities recorded in other income, before tax		(47)
Unrealized gain (loss) on securities recorded in other income, net of tax		(38)
Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interest		3
Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update201705
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interest		$ 127
Previously Reported
Significant Accounting Policies [Line Items]
Cash provided by other investing activities			11
Other operations and maintenance			738
Other income			116
Merchant Solar Projects | Terra Nova Renewable Partners
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners		33.00%
Merchant Solar Projects | Terra Nova Renewable Partners | Call Option
Significant Accounting Policies [Line Items]
Percentage ownership in total units		67.00%
Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Percentage ownership in total units		50.00%
Dominion Energy Midstream Partners, LP | Common and Subordinated Units
Significant Accounting Policies [Line Items]
Ownership interest percentage of limited partner interests		50.50%
Dominion Energy Midstream Partners, LP | Convertible Preferred Interests
Significant Accounting Policies [Line Items]
Ownership interest percentage of limited partner interests		37.50%
NRG Energy, Inc | Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners		33.00%
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Cash provided by other investing activities		$ (6)	(3)
Operating Revenue	[3]	1,748	1,831
Other energy-related purchases	[3]	591	456
Unrealized gains reclassified from AOCI to retained earnings		119
Unrealized gains reclassified from AOCI to retained earnings after-tax		73
Net unrealized gains on equity securities previously classified as cost method investments		36
Net unrealized gains on equity securities previously classified as cost method investments, after tax		22
Unrealized gain (loss) on securities recorded in other income, before tax	[2]	(47)
Other income		3	31
Tax reform, reclassification of tax expense (benefit) from AOCI to membership interests		3
Virginia Electric and Power Company | Retained Earnings
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments		3
Virginia Electric and Power Company | Current Regulatory Liabilities [Member]
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments		33
Virginia Electric and Power Company | Accounting Standards Update 2016-01 [Member]
Significant Accounting Policies [Line Items]
Unrealized gain (loss) on securities recorded in other income, before tax		(8)
Unrealized gain (loss) on securities recorded in other income, net of tax		(6)
Virginia Electric and Power Company | Previously Reported
Significant Accounting Policies [Line Items]
Cash provided by other investing activities			0
Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Cash provided by other investing activities		(5)	(8)
Operating Revenue	[4]	526	490
Purchased gas	[4]	29	43
Other income		33	25
Tax reform, reclassification of tax expense (benefit) from AOCI to membership interests		(26)
Dominion Energy Gas Holdings, LLC | Accounting Standards Update 2014-09 [Member] | Performing Processing And Fractionation Services
Significant Accounting Policies [Line Items]
Operating Revenue		25	0
Other energy-related purchases		25	0
Dominion Energy Gas Holdings, LLC | Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements
Significant Accounting Policies [Line Items]
Operating Revenue			(24)
Purchased gas			(24)
Dominion Energy Gas Holdings, LLC | Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interest		$ 3
Dominion Energy Gas Holdings, LLC | Previously Reported
Significant Accounting Policies [Line Items]
Cash provided by other investing activities			0
Other operations and maintenance			133
Other income			$ 5
DETI | Cumulative Effect Of Changes In Accounting Principle [Member]
Significant Accounting Policies [Line Items]
Number of existing contracts | Contract		3
[1]	See Note 10 for amounts attributable to related parties.
[2]	Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[3]	See Note 18 for amounts attributable to affiliates.
[4]	See Note 18 for amounts attributable to related parties.

Significant Accounting Polici45

Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		$ 189	$ 120	[1]	$ 486	$ 261
Restricted cash and equivalents	[2]	145	65		54	61
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		334	185		540	322
Virginia Electric and Power Company
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		6	14	[3]	289	11
Restricted cash and equivalents	[2]	10	10
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		16	24		289	11
Dominion Energy Gas Holdings, LLC
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents		6	4	[4]	11	23
Restricted cash and equivalents	[2]	23	26		20	20
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		$ 29	$ 30		$ 31	$ 43
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[3]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[4]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Proposed Acquisition Of SCANA) (Narrative) (Detail) $ in Millions	1 Months Ended
	Jan. 31, 2018USD ($)
SCANA
Business Acquisition And Dispositions [Line Items]
Common stock agreed to issue	66.90%
Business combination, liability incurred	$ 575
One-time rate credit to electric service customers, period within closing	90 days
Discount on existing customers	7.00%
Period to recognize reduction to SCE&C electric service customers bills	8 years
Combination debt outstanding	$ 7,000
SCANA | Termination Fee Paid By Dominion to SCANA
Business Acquisition And Dispositions [Line Items]
Contract termination fee	280
SCANA | Termination Fee Paid to Dominion
Business Acquisition And Dispositions [Line Items]
Contract termination fee	240
SCANA | Up-front Payment Arrangement | Electric Service Customers
Business Acquisition And Dispositions [Line Items]
Business combination, liability incurred	1,300
V C Summer Unit
Business Acquisition And Dispositions [Line Items]
Business combination cost related to exclusion from rate recovery	1,700
Columbia Energy
Business Acquisition And Dispositions [Line Items]
Business combination cost related to exclusion from rate recovery	$ 180

Acquisitions and Dispositions47

Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Detail) $ in Millions	1 Months Ended							3 Months Ended
	Dec. 31, 2017USD ($)MW	Jun. 30, 2017USD ($)MW	May 31, 2017USD ($)	Apr. 30, 2017MW	Mar. 31, 2017USD ($)project	Feb. 28, 2017USD ($)	Aug. 31, 2016project	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Jan. 31, 2017	Sep. 30, 2016
Business Acquisition And Dispositions [Line Items]
Cost of project								$ 7	$ 94
Solar Projects from Cypress Creek Renewables, LLC
Business Acquisition And Dispositions [Line Items]
Percentage of equity interests acquired										100.00%
Cash consideration			$ 154
Cost of project		$ 160
MW capacity | MW		79
Community Energy Solar, LLC
Business Acquisition And Dispositions [Line Items]
Percentage of equity interests acquired											100.00%
Cash consideration						$ 29
Cost of project	$ 205
MW capacity | MW	100
Solar Frontier Americas Holding, LLC
Business Acquisition And Dispositions [Line Items]
Percentage of equity interests acquired							100.00%
Cash consideration					$ 77
Cost of project		$ 78
MW capacity | MW		30
Number of projects | project					1		2
Discontinued efforts on acquisition of additional MW capacity | MW				20

Operating Revenue (Schedule of

Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Regulated gas transportation and storage:
Total operating revenue	[1]	$ 3,466	$ 3,384
Subsequent To Adoption of Revised Guidance
Regulated electric sales:
Nonregulated electric sales		418
Regulated gas sales:
Nonregulated gas sales		88
Regulated gas transportation and storage:
Other regulated revenues		50
Other nonregulated revenues	[2],[3]	136
Total operating revenue from contracts with customers		3,324
Other revenues		142
Total operating revenue		3,466
Subsequent To Adoption of Revised Guidance | FERC-regulated
Regulated gas transportation and storage:
Regulated gas transportation and storage		262
Subsequent To Adoption of Revised Guidance | State-regulated
Regulated gas transportation and storage:
Regulated gas transportation and storage		190
Subsequent To Adoption of Revised Guidance | Residential
Regulated electric sales:
Regulated electric sales		817
Regulated gas sales:
Regulated gas sales		364
Subsequent To Adoption of Revised Guidance | Commercial
Regulated electric sales:
Regulated electric sales		524
Regulated gas sales:
Regulated gas sales		103
Subsequent To Adoption of Revised Guidance | Industrial
Regulated electric sales:
Regulated electric sales		107
Subsequent To Adoption of Revised Guidance | Government and Other Retail
Regulated electric sales:
Regulated electric sales		213
Subsequent To Adoption of Revised Guidance | Wholesale
Regulated electric sales:
Regulated electric sales		42
Subsequent To Adoption of Revised Guidance | Other
Regulated gas sales:
Regulated gas sales		10
Virginia Electric and Power Company
Regulated gas transportation and storage:
Total operating revenue	[4]	1,748	1,831
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance
Regulated gas transportation and storage:
Other regulated revenues		32
Other nonregulated revenues	[3]	13
Total operating revenue from contracts with customers		1,748
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Residential
Regulated electric sales:
Regulated electric sales		817
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Commercial
Regulated electric sales:
Regulated electric sales		524
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Industrial
Regulated electric sales:
Regulated electric sales		107
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Government and Other Retail
Regulated electric sales:
Regulated electric sales		213
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Wholesale
Regulated electric sales:
Regulated electric sales		42
Dominion Energy Gas Holdings, LLC
Regulated gas transportation and storage:
Total operating revenue	[5]	526	$ 490
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance
Regulated gas sales:
Nonregulated gas sales	[3]	2
Regulated gas transportation and storage:
NGL revenue	[2],[3]	54
Management service revenue	[3]	47
Other regulated revenues	[3]	8
Other nonregulated revenues	[3]	2
Total operating revenue from contracts with customers		528
Other revenues	[3]	(2)
Total operating revenue		526
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | FERC-regulated
Regulated gas transportation and storage:
Regulated gas transportation and storage	[3]	199
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | State-regulated
Regulated gas transportation and storage:
Regulated gas transportation and storage	[3]	180
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | Residential
Regulated gas sales:
Regulated gas sales		29
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | Other
Regulated gas sales:
Regulated gas sales		$ 7
[1]	See Note 10 for amounts attributable to related parties.
[2]	Amounts above include $30 million and $26 million of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time.
[3]	See Notes 10 and 18 for amounts attributable to related parties and affiliates.
[4]	See Note 18 for amounts attributable to affiliates.
[5]	See Note 18 for amounts attributable to related parties.

Operating Revenue (Schedule o49

Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Public Utilities General Disclosures [Line Items]
NGL sales	$ 30
Dominion Energy Gas Holdings, LLC
Public Utilities General Disclosures [Line Items]
NGL sales	$ 26

Operating Revenue (Schedule o50

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	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,251
Revenue, expected to be recognized on multi-year contracts, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,709
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,593
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,474
Revenue, expected to be recognized on multi-year contracts, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1,327
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	$ 14,686
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	22,040
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 16
Revenue, expected to be recognized on multi-year contracts, period	9 months
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 21
Revenue, expected to be recognized on multi-year contracts, period	1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 3
Revenue, expected to be recognized on multi-year contracts, period	1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 1
Revenue, expected to be recognized on multi-year contracts, period	1 year
Virginia Electric and Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 41
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 479
Revenue, expected to be recognized on multi-year contracts, period	9 months
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 632
Revenue, expected to be recognized on multi-year contracts, period	1 year
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 562
Revenue, expected to be recognized on multi-year contracts, period	1 year
Dominion Energy Gas Holdings, LLC | 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	$ 473
Revenue, expected to be recognized on multi-year contracts, period	1 year
Dominion Energy Gas Holdings, LLC | 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	$ 379
Revenue, expected to be recognized on multi-year contracts, period	1 year
Dominion Energy Gas Holdings, LLC | 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	$ 2,084
Dominion Energy Gas Holdings, LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Revenues From Contract With Customer [Line Items]
Revenue, expected to be recognized on multi-year contracts	$ 4,609

Operating Revenue (Narrative) (

Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revenues From Contract With Customer [Line Items]
Contract asset balances	$ 48	$ 46
Contract liability balances	92	132
Revenue recognized from contract liability balances	116
Dominion Energy Gas Holdings, LLC
Revenues From Contract With Customer [Line Items]
Contract asset balances	66	66
Contract liability balances	14	41
Revenue recognized from contract liability balances	40
Virginia Electric and Power Company
Revenues From Contract With Customer [Line Items]
Contract liability balances	48	$ 50
Revenue recognized from contract liability balances	$ 50

Operating Revenue (Schedule o52

Operating Revenue (Schedule of Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers ) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Gas sales:
Total operating revenue	[1]	$ 3,466	$ 3,384
Virginia Electric and Power Company
Gas sales:
Total operating revenue	[2]	1,748	1,831
Dominion Energy Gas Holdings, LLC
Gas sales:
Total operating revenue	[3]	$ 526	490
Prior to adoption of revised guidance
Electric sales:
Regulated			1,766
Nonregulated			427
Gas sales:
Regulated			448
Nonregulated			144
Gas transportation and storage			492
Other revenues			107
Total operating revenue			3,384
Prior to adoption of revised guidance | Virginia Electric and Power Company
Electric sales:
Regulated			1,766
Gas sales:
Other revenues			65
Total operating revenue			1,831
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC
Gas sales:
Regulated			32
Nonregulated			2
Gas transportation and storage			396
Other revenues			60
Total operating revenue			$ 490
[1]	See Note 10 for amounts attributable to related parties.
[2]	See Note 18 for amounts attributable to affiliates.
[3]	See Note 18 for amounts attributable to related parties.

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
U.S. statutory rate	21.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	4.10%	2.80%
Investment tax credits	(0.50%)	(4.20%)
Production tax credits	(0.60%)	(0.80%)
Reversal of excess deferred income taxes	(1.40%)	(0.00%)
Other, net	(2.10%)	(3.80%)
Effective tax rate	20.50%	29.00%
Virginia Electric and Power Company
Income Tax Contingency [Line Items]
U.S. statutory rate	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	4.50%	3.80%
Investment tax credits	(0.90%)	(0.80%)
Production tax credits	(0.70%)	(0.60%)
Reversal of excess deferred income taxes	(2.00%)	(0.00%)
Other, net	(0.30%)	(0.60%)
Effective tax rate	21.60%	36.80%
Dominion Energy Gas Holdings, LLC
Income Tax Contingency [Line Items]
U.S. statutory rate	21.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	4.30%	0.30%
Investment tax credits	(0.00%)	(0.00%)
Production tax credits	(0.00%)	(0.00%)
Reversal of excess deferred income taxes	(1.00%)	(0.00%)
Other, net	(0.40%)	(0.60%)
Effective tax rate	23.90%	34.70%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Percentage of deductibility of interest expense	30.00%

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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Dominion Energy	$ 503	$ 632
Average shares of common stock outstanding – Basic	650.5	628.1
Average shares of common stock outstanding – Diluted	650.5	628.1
Earnings Per Common Share – Basic	$ 0.77	$ 1.01
Earnings Per Common Share – Diluted	$ 0.77	$ 1.01

Accumulated Other Comprehensi56

Accumulated Other Comprehensive Income (Schedule of Changes in AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[1]	$ 17,142
Cumulative-effect of changes in accounting principles		6
Ending balance		17,689
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[2]	12,224
Cumulative-effect of changes in accounting principles		3
Ending balance		12,262
Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative-effect of changes in accounting principles		3
Deferred Gains and Losses on Derivatives-Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(302)	$ (280)
Other comprehensive income before reclassifications: gains (losses)		111	43
Amounts reclassified from AOCI: (gains) losses	[3]	8	(23)
Net current period other comprehensive income (loss)		119	20
Cumulative-effect of changes in accounting principles		(64)
Less other comprehensive income attributable to noncontrolling interest		1
Ending balance		(248)	(260)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(12)	(8)
Other comprehensive income before reclassifications: gains (losses)		5
Net current period other comprehensive income (loss)		5
Cumulative-effect of changes in accounting principles		(3)
Ending balance		(10)	(8)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(23)	(24)
Other comprehensive income before reclassifications: gains (losses)		13	(9)
Amounts reclassified from AOCI: (gains) losses	[3]	(3)	11
Net current period other comprehensive income (loss)		10	2
Cumulative-effect of changes in accounting principles		(5)	0
Ending balance		(18)	(22)
Unrealized Gains and Losses on Investment Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		747	569
Other comprehensive income before reclassifications: gains (losses)		(13)	58
Amounts reclassified from AOCI: (gains) losses	[3]	1	(28)
Net current period other comprehensive income (loss)		(12)	30
Cumulative-effect of changes in accounting principles		(732)
Ending balance		3	599
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		74	54
Other comprehensive income before reclassifications: gains (losses)			7
Amounts reclassified from AOCI: (gains) losses	[3]		(3)
Net current period other comprehensive income (loss)			4
Cumulative-effect of changes in accounting principles		(73)
Ending balance		1	58
Unrecognized Pension and Other Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,101)	(1,082)
Amounts reclassified from AOCI: (gains) losses	[3]	25	13
Net current period other comprehensive income (loss)		25	13
Cumulative-effect of changes in accounting principles		(227)
Ending balance		(1,303)	(1,069)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(75)	(99)
Other comprehensive income before reclassifications: gains (losses)		0	0
Amounts reclassified from AOCI: (gains) losses	[3]	1	0
Net current period other comprehensive income (loss)		1	0
Cumulative-effect of changes in accounting principles		(21)	0
Ending balance		(95)	(99)
Other Comprehensive Loss From Equity Method Investee
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(3)	(6)
Other comprehensive income before reclassifications: gains (losses)			1
Net current period other comprehensive income (loss)			1
Ending balance		(3)	(5)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(659)	(799)
Other comprehensive income before reclassifications: gains (losses)		98	102
Amounts reclassified from AOCI: (gains) losses	[3]	34	(38)
Net current period other comprehensive income (loss)		132	64
Cumulative-effect of changes in accounting principles		(1,023)
Less other comprehensive income attributable to noncontrolling interest		1
Ending balance		(1,551)	(735)
Total | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		62	46
Other comprehensive income before reclassifications: gains (losses)		5	7
Amounts reclassified from AOCI: (gains) losses	[3]		(3)
Net current period other comprehensive income (loss)		5	4
Cumulative-effect of changes in accounting principles		(76)
Ending balance		(9)	50
Total | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(98)	(123)
Other comprehensive income before reclassifications: gains (losses)		13	(9)
Amounts reclassified from AOCI: (gains) losses	[3]	(2)	11
Net current period other comprehensive income (loss)		11	2
Cumulative-effect of changes in accounting principles		(26)	0
Ending balance		$ (113)	$ (121)
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	See table below for details about these reclassifications.

Accumulated Other Comprehensi57

Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue	[1]	$ (3,466)	$ (3,384)
Purchased gas		340	305
Electric fuel and other energy-related purchases		744	575
Interest and related charges		314	292
Other income		(100)	(162)
Income from operations including noncontrolling interests before income tax expense		(661)	(949)
Income tax expense		135	275
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue	[2]	(1,748)	(1,831)
Electric fuel and other energy-related purchases	[2]	591	456
Interest and related charges	[2]	132	120
Other income		(3)	(31)
Income from operations including noncontrolling interests before income tax expense		(235)	(564)
Income tax expense		51	208
Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue	[3]	(526)	(490)
Purchased gas	[3]	29	43
Interest and related charges	[3]	25	23
Other income		(33)	(25)
Income from operations including noncontrolling interests before income tax expense		(218)	(165)
Income tax expense		52	57
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from operations including noncontrolling interests before income tax expense		11	(37)
Income tax expense		(3)	14
Income from continuing operations including noncontrolling interests		8	(23)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from operations including noncontrolling interests before income tax expense		(4)	18
Income tax expense		1	(7)
Income from continuing operations including noncontrolling interests		(3)	11
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue		12	(62)
Purchased gas		2	(1)
Electric fuel and other energy-related purchases		(7)	1
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating revenue		3	3
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges		12	11
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges		1	1
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		(8)	14
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		(8)	14
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gain) loss on sale of securities		1	(53)
Impairment			9
Income from operations including noncontrolling interests before income tax expense		1	(44)
Income tax expense			16
Income from continuing operations including noncontrolling interests		1	(28)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized (gain) loss on sale of securities			(6)
Impairment			1
Income from operations including noncontrolling interests before income tax expense			(5)
Income tax expense			2
Income from continuing operations including noncontrolling interests			(3)
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		(5)	(4)
Unrecognized pension and other postretirement benefit costs:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrecognized pension and other postretirement benefit costs, before tax		26	21
Unrecognized pension and other postretirement benefit costs, income tax expense		(1)	(8)
Unrecognized pension and other postretirement benefit costs, net of tax		25	13
Unrecognized pension and other postretirement benefit costs: | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrecognized pension and other postretirement benefit costs, before tax		2	1
Unrecognized pension and other postretirement benefit costs, income tax expense		(1)	(1)
Unrecognized pension and other postretirement benefit costs, net of tax		1
Amortization of actuarial losses | Amounts Reclassified From AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		31	25
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income		$ 2	$ 1
[1]	See Note 10 for amounts attributable to related parties.
[2]	See Note 18 for amounts attributable to affiliates.
[3]	See Note 18 for amounts attributable to related parties.

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)$ / MMBTU$ / MWh		Dec. 31, 2017USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 244		$ 307
Fair Value of Derivative Liabilities		90		284
Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		129	[1]	166
Fair Value of Derivative Liabilities		23		66
Fair Value, Measurements, Recurring | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		156		258
Fair Value of Derivative Liabilities		31		197
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		123		166
Fair Value of Derivative Liabilities		9		9
Fair Value, Measurements, Recurring | Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		122
Fair Value of Derivative Liabilities		2
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		119
Fair Value of Derivative Liabilities		2
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		122		157
Fair Value of Derivative Liabilities		2		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		119		152
Fair Value of Derivative Liabilities		2		$ 5
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		9
Fair Value of Derivative Liabilities		2
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Liabilities		2
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 8
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Minimum | Liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	(5)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Minimum | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	(5)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Minimum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Minimum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	(1)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Maximum | Liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Maximum | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Maximum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Maximum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Weighted Average | Liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	0
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Weighted Average | Liabilities | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	0
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Weighted Average | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | FTRs | Commodity | Weighted Average | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	1
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[4]	$ 83
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	[4]	$ 81
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Minimum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Minimum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	(2)
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Maximum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Maximum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	6
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Weighted Average | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2],[3]	0
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Natural Gas | Commodity | Weighted Average | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2],[3]	(1)
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 29
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 29
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Minimum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	23
Price volatility (percentage)	[5]	7.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Minimum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	23
Price volatility (percentage)	[5]	7.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Maximum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	49
Price volatility (percentage)	[5]	63.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Maximum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2]	49
Price volatility (percentage)	[5]	63.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Weighted Average | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	35
Price volatility (percentage)	[3],[5]	27.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Electricity | Electricity | Weighted Average | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MWh	[2],[3]	35
Price volatility (percentage)	[3],[5]	27.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 1
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets		$ 1
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Minimum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	2
Price volatility (percentage)	[5]	14.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Minimum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	2
Price volatility (percentage)	[5]	14.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Maximum | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	6
Price volatility (percentage)	[5]	29.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Maximum | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2]	6
Price volatility (percentage)	[5]	29.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Weighted Average | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2],[3]	3
Price volatility (percentage)	[3],[5]	23.00%
Fair Value, Measurements, Recurring | Level 3 | Option model | Natural Gas | Physical options | Weighted Average | Assets | Virginia Electric and Power Company
Fair Value, Option, Quantitative Disclosures [Line Items]
Market price (per Dth, per MWh, per Gal) | $ / MMBTU	[2],[3]	3
Price volatility (percentage)	[3],[5]	23.00%
[1]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2]	Represents market prices beyond defined terms for Levels 1 and 2.
[3]	Averages weighted by volume.
[4]	Includes basis.
[5]	Represents volatilities unrepresented in published markets.

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		$ 244		$ 307
Derivative Liabilities		90		284
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		129	[1]	166
Derivative Liabilities		23		66
Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		8
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	[2]	5,249		5,379
Total liabilities		90		284
Fair Value, Measurements, Recurring | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		2,392		2,466
Total liabilities		23		66
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		44		32
Total liabilities		1		8
Fair Value, Measurements, Recurring | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	3,435		3,493
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	[3]	1,539		1,566
Fair Value, Measurements, Recurring | Fixed Income Securities | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	445		444
Fair Value, Measurements, Recurring | Fixed Income Securities | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[3]	221		224
Fair Value, Measurements, Recurring | Fixed Income Securities | Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	1,113		1,101
Fair Value, Measurements, Recurring | Fixed Income Securities | Government securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[3]	500		494
Fair Value, Measurements, Recurring | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	12		34
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	[3]	3		16
Fair Value, Measurements, Recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		156		258
Derivative Liabilities		31		197
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		123		166
Derivative Liabilities		9		9
Fair Value, Measurements, Recurring | Commodity | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities				6
Fair Value, Measurements, Recurring | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		17
Derivative Liabilities		58		85
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		6
Derivative Liabilities		14		57
Fair Value, Measurements, Recurring | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		2
Fair Value, Measurements, Recurring | Foreign currency | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		2
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	[2]	3,749		3,834
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		1,715		1,750
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	3,435		3,493
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	[3]	1,539		1,566
Fair Value, Measurements, Recurring | Level 1 | Fixed Income Securities | Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	302		307
Fair Value, Measurements, Recurring | Level 1 | Fixed Income Securities | Government securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[3]	173		168
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	12		34
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	[3]	3		16
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	[2]	1,378		1,388
Total liabilities		88		277
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		558		564
Total liabilities		21		61
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		44		32
Total liabilities		1		6
Fair Value, Measurements, Recurring | Level 2 | Fixed Income Securities | Corporate debt instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	445		444
Fair Value, Measurements, Recurring | Level 2 | Fixed Income Securities | Corporate debt instruments | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[3]	221		224
Fair Value, Measurements, Recurring | Level 2 | Fixed Income Securities | Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[2]	811		794
Fair Value, Measurements, Recurring | Level 2 | Fixed Income Securities | Government securities | Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	[3]	327		326
Fair Value, Measurements, Recurring | Level 2 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		34		101
Derivative Liabilities		29		190
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		4		14
Derivative Liabilities		7		4
Fair Value, Measurements, Recurring | Level 2 | Commodity | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities				4
Fair Value, Measurements, Recurring | Level 2 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		17
Derivative Liabilities		58		85
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		6
Derivative Liabilities		14		57
Fair Value, Measurements, Recurring | Level 2 | Foreign currency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		2
Fair Value, Measurements, Recurring | Level 2 | Foreign currency | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		2
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		122
Total assets	[2]	122		157
Derivative Liabilities		2
Total liabilities		2		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]
Derivative Asset		119
Total assets		119		152
Derivative Liabilities		2
Total liabilities		2		5
Fair Value, Measurements, Recurring | Level 3 | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities				2
Fair Value, Measurements, Recurring | Level 3 | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		122		157
Derivative Liabilities		2		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		119		152
Derivative Liabilities		$ 2		5
Fair Value, Measurements, Recurring | Level 3 | Commodity | Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities				$ 2
[1]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2]	Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $195 million and $88 million of assets at March 31, 2018 and December 31, 2017, 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.
[3]	Includes investments held in the nuclear decommissioning trusts. Excludes $135 million and $27 million of assets at March 31, 2018 and December 31, 2017, 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 (Asse60

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value using NAV	$ 195	$ 88
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	$ 135	$ 27

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
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 150	$ 139
Total realized and unrealized gains (losses):
Included in earnings	(18)	(15)
Included in other comprehensive income	1
Included in regulatory assets/liabilities	(21)	(9)
Settlements	7	12
Transfers out of Level 3	1	3
Ending balance	120	130
Virginia Electric and Power Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	147	143
Total realized and unrealized gains (losses):
Included in earnings	(17)	(15)
Included in regulatory assets/liabilities	(19)	(8)
Settlements	6	12
Ending balance	117	132
Dominion Energy Gas Holdings, LLC
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(2)	(2)
Total realized and unrealized gains (losses):
Included in other comprehensive income	1	(1)
Transfers out of Level 3	1	3
Ending balance	$ 0	$ 0

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Gains and Losses Included in the Level 3 Fair Value Category) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) included in earnings	$ (18)	$ (15)
Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) included in earnings	(1)
Electric Fuel and Other Energy-Related Purchases
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) included in earnings	$ (17)	$ (15)

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains or losses included in earnings in Level 3 fair value category	$ 0	$ 0
Dominion Energy Gas Holdings, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains or losses included in earnings in Level 3 fair value category	$ 0	$ 0

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[1]	$ 29,362	$ 28,666
Junior subordinated notes	[2]	3,980	3,981
Remarketable subordinated notes	[2]	1,381	1,379
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[1],[3]	31,044	31,233
Junior subordinated notes	[2],[3]	4,017	4,102
Remarketable subordinated notes	[2],[3]	1,299	1,446
Virginia Electric and Power Company | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[2]	11,690	11,346
Virginia Electric and Power Company | Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[2],[3]	12,702	12,842
Dominion Energy Gas Holdings, LLC | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[4]	3,579	3,570
Dominion Energy Gas Holdings, LLC | Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	[3],[4]	$ 3,657	$ 3,719
[1]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At March 31, 2018 and December 31, 2017, includes the valuation of certain fair value hedges associated with fixed rate debt of $(54) million and $(22) million, respectively.
[2]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium.
[3]	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 issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.
[4]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.

Fair Value Measurements (Fina65

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Valuation of certain fair value hedges associated with fixed rate debt	$ (54)	$ (22)

Derivatives and Hedge Account66

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 240		$ 303
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	240		303
Total derivatives, not subject to a master netting or similar arrangement	4		4
Gross Amounts of Recognized Assets, Total	244		307
Derivative Asset	244		307
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	34		99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	206		204
Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	124		155
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	124		155
Total derivatives, not subject to a master netting or similar arrangement	5		11
Gross Amounts of Recognized Assets, Total	129		166
Derivative Asset	129	[1]	166
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5		4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	119		151
Dominion Energy Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44		32
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	44		32
Derivative Asset	44		32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	43		30
Commodity | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	132		174
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	132		174
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5		9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	127		165
Commodity | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	118		155
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	118		155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	2		4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	116		151
Commodity | Exchange
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	20		80
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	20		80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	19		80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	1		0
Interest rate | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44		17
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	44		17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	9		8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	35		9
Interest rate | Over-the-counter | Virginia Electric and Power Company
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	6		0
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	6		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3		0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	3		0
Foreign currency | Over-the-counter
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44		32
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	44		32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	43		30
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44		32
Gross Amounts Offset in the Consolidated Balance Sheet	0		0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	44		32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1		2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received	0		0
Net Amounts	$ 43		$ 30
[1]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.

Derivatives and Hedge Account67

Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 90	$ 283
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	90	283
Total derivatives, not subject to a master netting or similar arrangement	0	1
Gross Amounts of Recognized Liabilities, Total	90	284
Derivative Liabilities	90	284
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	34	99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	46
Net Amounts	56	138
Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	16	61
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	16	61
Total derivatives, not subject to a master netting or similar arrangement	7	5
Gross Amounts of Recognized Liabilities, Total	23	66
Derivative Liabilities	23	66
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	11	57
Dominion Energy Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1	8
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1	8
Derivative Liabilities	1	8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	0	6
Commodity | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	12	76
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	12	76
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	5	9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	6
Net Amounts	7	61
Commodity | Over-the-counter | Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	2	4
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	2	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	2	4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	0	0
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0	6
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	0	6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	0	6
Commodity | Exchange
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	19	120
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	19	120
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	19	80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	40
Net Amounts	0	0
Interest rate | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	58	85
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	58	85
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	9	8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	49	77
Interest rate | Over-the-counter | Virginia Electric and Power Company
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	14	57
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	14	57
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	3	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	11	57
Foreign currency | Over-the-counter
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1	2
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	0	0
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1	2
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	1	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	1	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral	0	0
Net Amounts	$ 0	$ 0

Derivatives and Hedge Account68

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 3 months ended Mar. 31, 2018		USD ($)MWhBcfgal	EUR (€)
Fixed Price - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	[1]	70
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	[1]	21
Fixed Price - Natural Gas - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf	[1]	24
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf	[1]	4
Basis - Natural Gas - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf		233
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf		132
Basis - Natural Gas - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | Bcf		600
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of derivative activity | Bcf		532
Fixed Price - Electricity - Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	[1]	9,637,759
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh	[1]	1,445,264
Fixed Price - Electricity - Non-current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh	[1]	919,920
Financial Transmission Rights - Electricity- Current Derivative Contract
Derivative [Line Items]
Volume of electricity | MWh		19,630,088
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Volume of electricity | MWh		17,179,279
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
Liquids - Current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | gal	[2]	60,630,000
Liquids - Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Volume of derivative activity | gal		55,254,000
Liquids - Non-current Derivative Contract
Derivative [Line Items]
Volume of derivative activity | gal	[2]	0
Liquids - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Volume of derivative activity | gal		0
Foreign currency | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | €			€ 250,000,000
Foreign Exchange - Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[3],[4]	$ 0
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[5]	0
Foreign Exchange - Non- Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[3],[4]	280,000,000
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[5]	280,000,000
Interest Rate - Current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[4]	1,400,000,000
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[6]	600,000,000
Interest Rate - Non-current Derivative Contract
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[4]	4,790,445,562
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros) | $	[6]	$ 900,000,000
[1]	Includes options.
[2]	Includes NGLs and oil.
[3]	Euro equivalent volumes are €250,000,000.
[4]	Maturity is determined based on final settlement period.
[5]	Maturity is determined based on final settlement period. Euro equivalent volumes are €250,000,000
[6]	Maturity is determined based on final settlement period.

Derivatives and Hedge Account69

Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (248)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(8)
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(10)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(1)
Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(18)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	(4)
Commodity | Gas
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(3)
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (2)
Maximum Term	31 months
Commodity | Electricity
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ 6
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ 5
Maximum Term	20 months
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (262)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (10)
Maximum Term	381 months
Interest rate | Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (10)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (1)
Maximum Term	381 months
Interest rate | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (29)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (3)
Maximum Term	321 months
Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ 11
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (1)
Maximum Term	99 months
Foreign currency | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ 11
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (1)
Maximum Term	99 months

Derivatives and Hedge Account70

Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Derivatives Fair Value [Line Items]
Derivative Asset		$ 244		$ 307
Derivative Liabilities		90		284
Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		129	[1]	166
Derivative Liabilities		23		66
Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		8
Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset		94	[2]	169	[3]
Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	50		75
Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		78		163
Current Assets | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		48		75
Current Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		16		6
Current Assets | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		2
Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[4]	150		138
Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		79		91	[1]
Noncurrent Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[5]	44		32
Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		78		95
Noncurrent Assets | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		75		91
Noncurrent Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		28		11
Noncurrent Assets | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		4
Noncurrent Assets | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities		49	[6]	250	[7]
Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	20		53
Current Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities	[8]	1		8
Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		29		195
Current Liabilities | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		9		9
Current Liabilities | Commodity | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities				6
Current Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		19		53
Current Liabilities | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		11		44
Current Liabilities | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		2
Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		2
Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities	[9]	41		34
Noncurrent Liabilities [Member] | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities	[10]	3		13
Noncurrent Liabilities [Member] | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		2		2
Noncurrent Liabilities [Member] | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		39		32
Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		13
Fair Value - Derivatives under Hedge Accounting [Member]
Derivatives Fair Value [Line Items]
Derivative Asset		106		54
Derivative Liabilities		72		191
Fair Value - Derivatives under Hedge Accounting [Member] | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset	[1]	6
Derivative Liabilities		14		57
Fair Value - Derivatives under Hedge Accounting [Member] | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Derivative Liabilities		1		8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset		33	[2]	11	[3]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	2
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		17		5
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		16		6
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		2
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[4]	73		43
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		4
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset	[5]	44		32
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		1
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate
Derivatives Fair Value [Line Items]
Derivative Asset		28		11
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		4
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Asset		44		32
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities		32	[6]	158	[7]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	11		44
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities	[8]	1		8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		12		103
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities				6
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		19		53
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		11		44
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		2
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		2
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities	[9]	40		33
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities	[10]	3		13
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		1		1
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate
Derivatives Fair Value [Line Items]
Derivative Liabilities		39		32
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		3		13
Fair Value ? Derivatives not under Hedge Accounting
Derivatives Fair Value [Line Items]
Derivative Asset		138		253
Derivative Liabilities		18		93
Fair Value ? Derivatives not under Hedge Accounting | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		123	[1]	166
Derivative Liabilities		9		9
Fair Value ? Derivatives not under Hedge Accounting | Current Assets
Derivatives Fair Value [Line Items]
Derivative Asset		61	[2]	158	[3]
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset	[3]	48		75
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		61		158
Fair Value ? Derivatives not under Hedge Accounting | Current Assets | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		48		75
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative Asset	[4]	77		95
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		75		91	[1]
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity
Derivatives Fair Value [Line Items]
Derivative Asset		77		95
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Asset		75		91
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities
Derivatives Fair Value [Line Items]
Derivative Liabilities		17	[6]	92	[7]
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities	[7]	9		9
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		17		92
Fair Value ? Derivatives not under Hedge Accounting | Current Liabilities | Commodity | Virginia Electric and Power Company
Derivatives Fair Value [Line Items]
Derivative Liabilities		9		9
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities	[9]	1		1
Fair Value ? Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Commodity
Derivatives Fair Value [Line Items]
Derivative Liabilities		$ 1		$ 1
[1]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2]	Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[3]	Current derivative assets are presented in other current assets in Virginia Power's Consolidated Balance Sheets.
[4]	Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[5]	Noncurrent derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[6]	Current derivative liabilities are presented in other current liabilities in Dominion Energy's Consolidated Balance Sheets.
[7]	Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets.
[8]	Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
[9]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[10]	Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

Derivatives and Hedge Account71

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
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	$ 148	$ 70
Amount of Gain (Loss) Reclassified From AOCI to Income		(11)	37
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	68	8
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[3]	7
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[4]	68	8
Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[5]	17	(16)
Amount of Gain (Loss) Reclassified From AOCI to Income		4	(18)
Electric Fuel and Other Energy-Related Purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		7	(1)
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	97	87
Amount of Gain (Loss) Reclassified From AOCI to Income		(7)	62
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	0	0
Commodity | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[5]	4	2
Amount of Gain (Loss) Reclassified From AOCI to Income		(3)	(3)
Commodity | Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		(12)	62
Commodity | Operating Revenue | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		(3)	(3)
Commodity | Purchased Gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified From AOCI to Income		(2)	1
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1],[6]	38	1
Amount of Gain (Loss) Reclassified From AOCI to Income	[6]	(12)	(11)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2],[6]	68	8
Interest rate | Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[3],[7]	7
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[4],[7]	68	8
Interest rate | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[5],[8]	0
Amount of Gain (Loss) Reclassified From AOCI to Income	[8]	(1)	(1)
Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1],[9]	13	(18)
Amount of Gain (Loss) Reclassified From AOCI to Income	[9]	8	(14)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2],[9]	0	0
Foreign currency | Dominion Energy Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[5],[10]	13	(18)
Amount of Gain (Loss) Reclassified From AOCI to Income	[10]	$ 8	$ (14)
[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 deferred into AOCI have no associated effect in Dominion Energy Gas' Consolidated Statements of Income.
[6]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges.
[7]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[8]	Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in interest and related charges
[9]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
[10]	Amounts recorded in Dominion Energy Gas' Consolidated Statements of Income are classified in other income.

Derivatives and Hedge Account72

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
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	$ (7)	$ (4)
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]		(17)
Commodity | Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2],[3]		(17)
Commodity | Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	6	4
Commodity | Purchased Gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]		16
Commodity | Electric Fuel and Other Energy-Related Purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]	$ (13)	(23)
Commodity | Other operations and maintenance
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[1]		$ (1)
[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.
[3]	Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.

Derivatives and Hedge Account73

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Parenthetical) (Detail)	Mar. 31, 2018EUR (€)
Dominion Energy Gas Holdings, LLC | Foreign currency
Derivative [Line Items]
Interest rate / Foreign currency (US Dollars, Euros)	€ 250,000,000

Investments (Narrative) (Detail

Investments (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Contributions to equity method affiliates		$ 87	$ 146
Operating Revenue	[1]	3,466	3,384
Other receivables	[1]	136		$ 126	[2]
Liabilities, other deferred credits and other liabilities		16,853		16,631	[2]
Investment in equity method affiliates		1,638		1,544	[2]
Dominion Energy Gas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Operating Revenue	[3]	526	490
Other receivables	[3]	22		15	[4]
Liabilities, other deferred credits and other liabilities		2,904		2,866	[4]
Equity in earnings on investments		9	7
Dominion Energy Gas Holdings, LLC | Partnership Interest
Schedule of Equity Method Investments [Line Items]
Equity in earnings on investments		9	7
Distributions received from investment		7	6
Investment in equity method affiliates		97		95
Carrying amount of investment that exceeded share of underlying equity		8
Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Contributions to equity method affiliates		78	117
Atlantic Coast Pipeline | DETI
Schedule of Equity Method Investments [Line Items]
Operating Revenue		46	31
Other receivables		17	$ 12
NedPower Mount Storm LLC
Schedule of Equity Method Investments [Line Items]
Liabilities, other deferred credits and other liabilities		9		17
Trading Securities
Schedule of Equity Method Investments [Line Items]
Rabbi trust securities		$ 114		$ 112
[1]	See Note 10 for amounts attributable to related parties.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	See Note 18 for amounts attributable to related parties.
[4]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Investments (Equity and Debt Se

Investments (Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Investment Holdings [Line Items]
Amortized Cost, Total		$ 3,243		$ 3,200
Total Unrealized Gains		1,850		1,899
Total Unrealized Losses	[1]	(33)		(6)
Fair Value		5,060		5,093
Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total		1,575		1,549
Total Unrealized Gains		841		852
Total Unrealized Losses	[2]	(16)		(2)
Fair Value		2,400		2,399
Cash Equivalents and Other [Member]
Investment Holdings [Line Items]
Amortized Cost, Total	[3]	8		34
Fair Value	[3]	8		34
Cash Equivalents and Other [Member] | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Other Investments	[4]	7		22
Fair Value	[4]	7		22
Cost-method Investments
Investment Holdings [Line Items]
Amortized Cost, Total				68
Fair Value				68
Cost-method Investments | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Other Investments				68
Fair Value				68
Common/collective trust funds | Fixed Income Securities
Investment Holdings [Line Items]
Amortized Cost, Total	[5]	56		60
Fair Value	[5]	56		60
Common/collective trust funds | Fixed Income Securities | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total	[6]	25		27
Fair Value	[6]	25		27
Corporate debt instruments | Fixed Income Securities
Investment Holdings [Line Items]
Amortized Cost, Total	[5]	442		430
Total Unrealized Gains	[5]	9		15
Total Unrealized Losses	[5]	(6)		(1)
Fair Value	[5]	445		444
Corporate debt instruments | Fixed Income Securities | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total	[6]	219		216
Total Unrealized Gains	[6],[7]	4		8
Total Unrealized Losses	[6],[7]	(2)
Fair Value	[6]	221		224
Government securities | Fixed Income Securities
Investment Holdings [Line Items]
Amortized Cost, Total	[5]	1,061		1,039
Total Unrealized Gains	[5]	17		27
Total Unrealized Losses	[5]	(12)		(5)
Fair Value	[5]	1,066		1,061
Government securities | Fixed Income Securities | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total	[6]	496		482
Total Unrealized Gains	[6],[7]	8		13
Total Unrealized Losses	[6],[7]	(5)		(2)
Fair Value	[6]	499		493
Equity securities: | U.S.
Investment Holdings [Line Items]
Amortized Cost, Total		1,676	[8]	1,569	[5]
Total Unrealized Gains		1,824	[8]	1,857	[5]
Total Unrealized Losses	[8]	(15)
Fair Value		3,485	[8]	3,426	[5]
Equity securities: | U.S. | Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total	[8]	828		734
Total Unrealized Gains	[7],[8]	829		831
Total Unrealized Losses	[7],[8]	(9)
Fair Value	[8]	$ 1,648		$ 1,565
[1]	The fair value of securities in an unrealized loss position was $1.1 billion and $565 million at March 31, 2018 and December 31, 2017, respectively.
[2]	The fair value of securities in an unrealized loss position was $510 million and $234 million at March 31, 2018 and December 31, 2017, respectively.
[3]	Includes pending sales of securities of $3 million and $5 million at March 31, 2018 and December 31, 2017, respectively.
[4]	Includes pending sales of securities of $4 million and $6 million at March 31, 2018 and December 31, 2017, respectively.
[5]	Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[6]	Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[7]	Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2. Unrealized gains and losses on equity securities (for 2017) and fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[8]	Effective January 2018, unrealized gains and losses on equity securities, including those previously classified as cost method investments, are included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.

Investments (Equity and Debt 76

Investments (Equity and Debt Securities and Cash Equivalents and Cost Method Investments in Decommissioning Trust Funds) (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Fair value of securities in an unrealized loss position	$ 1,100	$ 565
Net assets related to pending sales and purchases of securities	3	5
Virginia Electric and Power Company
Investment Holdings [Line Items]
Fair value of securities in an unrealized loss position	510	234
Net assets related to pending sales and purchases of securities	$ 4	$ 6

Investments (Portion of Unreali

Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Investment Holdings [Line Items]
Net losses recognized during the period	$ (65)
Less: Net gains recognized during the period on securities sold during the period	(19)
Unrealized gain (loss) on securities recorded in other income, before tax	(84)	[1]
Virginia Electric and Power Company
Investment Holdings [Line Items]
Net losses recognized during the period	(32)
Less: Net gains recognized during the period on securities sold during the period	(15)
Unrealized gain (loss) on securities recorded in other income, before tax	$ (47)	[1]
[1]	Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.

Investments (Fair Value of our

Investments (Fair Value of our Marketable Debt Securities by Contractual Maturity) (Detail) $ in Millions	Mar. 31, 2018USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	$ 165
Due after one year through five years	375
Due after five years through ten years	375
Due after ten years	652
Total	1,567
Virginia Electric and Power Company
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less	43
Due after one year through five years	155
Due after five years through ten years	208
Due after ten years	339
Total	$ 745

Investments (Selected Informati

Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales		$ 419	$ 756
Realized gains	[1]	36	94
Realized losses	[1]	19	20
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales		218	330
Realized gains	[1]	18	45
Realized losses	[1]	$ 5	$ 10
[1]	Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

Property Plant and Equipment (N

Property Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended			3 Months Ended
	Mar. 31, 2018USD ($)afield	Feb. 28, 2018USD ($)	Jan. 31, 2018a	Mar. 31, 2018USD ($)afield	Mar. 31, 2017USD ($)	Nov. 30, 2014afield
Virginia Electric and Power Company | Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property Plant And Equipment [Line Items]
Amount of consideration					$ 91
Amount recognized in operating revenue and other income from sale				$ 2	$ 7
Amount to be recognized in other income ratably through 2023	$ 33			33
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties
Property Plant And Equipment [Line Items]
Amount of consideration		$ 28
Development rights (number of acres) | a			18,000			24,000
Number of natural gas storage fields | field						1
Gas and oil area developed net remaining interest conveyed percentage			50.00%
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties | Other operations and maintenance
Property Plant And Equipment [Line Items]
Gain from sale		28
After tax gain on sale		$ 20
Dominion Energy Gas Holdings, LLC | Uticaand Point Pleasant Shale | Oil and Gas Properties
Property Plant And Equipment [Line Items]
Amount of consideration	$ 16			$ 16
Development rights (number of acres) | a	11,000			11,000
Number of natural gas storage fields | field	1			1
Proceeds from assignment of Shale Development Rights	$ 16
Dominion Energy Gas Holdings, LLC | Uticaand Point Pleasant Shale | Oil and Gas Properties | Other operations and maintenance
Property Plant And Equipment [Line Items]
Gain from sale	16
After tax gain on sale	$ 12

Regulatory Assets and Liabili81

Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	$ 408	$ 193
Regulatory liabilities-noncurrent		6,977	6,916	[2]
Total regulatory liabilities		7,385	7,109
PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	9	20
Reserve for rate credits to customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	200
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	101	101
Regulatory liabilities-noncurrent	[5]	1,395	1,384
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		98	72
Regulatory liabilities-noncurrent		366	353
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	1,113	1,121
Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	4,047	4,058
Cost-of-service impact of 2017 Tax Reform Act
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[8]	56
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		304	127	[9]
Regulatory liabilities-noncurrent		4,796	4,760	[9]
Total regulatory liabilities		5,100	4,887
Virginia Electric and Power Company | Reserve for rate credits to customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	200
Virginia Electric and Power Company | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		20	39
Regulatory liabilities-noncurrent		84	74
Virginia Electric and Power Company | Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	1,113	1,121
Virginia Electric and Power Company | Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	2,575	2,581
Virginia Electric and Power Company | Cost-of-service impact of 2017 Tax Reform Act
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[8]	39
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[10]	4	8
Virginia Electric and Power Company | Provision for future cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	80	80
Regulatory liabilities-noncurrent	[5]	922	915
Virginia Electric and Power Company | Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[11]	63	69
Dominion Energy Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	42	38
Regulatory liabilities-noncurrent	[12]	1,243	1,227
Total regulatory liabilities		1,285	1,265
Dominion Energy Gas Holdings, LLC | PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	9	20
Dominion Energy Gas Holdings, LLC | Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	13	13
Regulatory liabilities-noncurrent	[6]	161	160
Dominion Energy Gas Holdings, LLC | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		20	5
Regulatory liabilities-noncurrent		78	69
Dominion Energy Gas Holdings, LLC | Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	995	$ 998
Dominion Energy Gas Holdings, LLC | Cost-of-service impact of 2017 Tax Reform Act
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[8]	$ 9
[1]	Current regulatory liabilities are presented in other current liabilities in Dominion Energy’s and Dominion Energy Gas’ Consolidated Balance Sheets.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions.
[4]	Charge associated with Virginia legislation enacted in March 2018 that requires one-time rate credits of certain amounts to utility customers. See Note 13 for more information.
[5]	Rates charged to customers by the Companies' regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.
[6]	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.
[7]	Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC-equity.
[8]	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 Note 13 for more information.
[9]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[10]	Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion Energy's and Virginia Power's generation operations.
[11]	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.
[12]	Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.

Regulatory Assets and Liabili82

Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory assets-current	[1]	$ 263	$ 294
Regulatory assets-noncurrent		2,698	2,480	[2]
Total regulatory assets		2,961	2,774
Deferred nuclear refueling outage costs
Regulatory Assets [Line Items]
Regulatory assets-current	[3]	$ 57	54
Deferred nuclear refueling outage costs | Maximum
Regulatory Assets [Line Items]
Amortization period for deferred costs		18 months
Deferred rate adjustment clause costs
Regulatory Assets [Line Items]
Regulatory assets-current	[4]	$ 78	70
Regulatory assets-noncurrent	[4]	357	401
Deferred cost of fuel used in electric generation
Regulatory Assets [Line Items]
Regulatory assets-current	[5]	16	23
Regulatory assets-noncurrent	[5]	322
Unrecovered gas costs
Regulatory Assets [Line Items]
Regulatory assets-current	[6]	5	38
Other
Regulatory Assets [Line Items]
Regulatory assets-current		107	109
Regulatory assets-noncurrent		157	151
Unrecognized pension and other postretirement benefit costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[7]	1,316	1,336
PJM transmission rates
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[8]	229	222
Derivatives
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[9]	157	223
Utility reform legislation
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[10]	160	147
Virginia Electric and Power Company
Regulatory Assets [Line Items]
Regulatory assets-current	[1]	224	205
Regulatory assets-noncurrent		1,009	810	[11]
Total regulatory assets		1,233	1,015
Virginia Electric and Power Company | Deferred nuclear refueling outage costs
Regulatory Assets [Line Items]
Regulatory assets-current	[3]	57	54
Virginia Electric and Power Company | Deferred rate adjustment clause costs
Regulatory Assets [Line Items]
Regulatory assets-current	[4]	75	56
Regulatory assets-noncurrent	[4]	255	312
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation
Regulatory Assets [Line Items]
Regulatory assets-current	[5]	16	23
Regulatory assets-noncurrent	[5]	322
Virginia Electric and Power Company | Other
Regulatory Assets [Line Items]
Regulatory assets-current		76	72
Regulatory assets-noncurrent		79	86
Virginia Electric and Power Company | PJM transmission rates
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[8]	229	222
Virginia Electric and Power Company | Derivatives
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[9]	124	190
Dominion Energy Gas Holdings, LLC
Regulatory Assets [Line Items]
Regulatory assets-current	[1]	6	26
Regulatory assets-noncurrent	[12]	540	511
Total regulatory assets		546	537
Dominion Energy Gas Holdings, LLC | Deferred rate adjustment clause costs
Regulatory Assets [Line Items]
Regulatory assets-current	[4]	3	14
Regulatory assets-noncurrent	[4]	102	89
Dominion Energy Gas Holdings, LLC | Unrecovered gas costs
Regulatory Assets [Line Items]
Regulatory assets-current	[6]	0	8
Dominion Energy Gas Holdings, LLC | Other
Regulatory Assets [Line Items]
Regulatory assets-current		3	4
Regulatory assets-noncurrent		23	17
Dominion Energy Gas Holdings, LLC | Unrecognized pension and other postretirement benefit costs
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[7]	255	258
Dominion Energy Gas Holdings, LLC | Utility reform legislation
Regulatory Assets [Line Items]
Regulatory assets-noncurrent	[10]	$ 160	$ 147
[1]	Current regulatory assets are presented in other current assets in the Companies’ Consolidated Balance Sheets.
[2]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[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]	Primarily reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects net of income taxes refundable from the 2017 Tax Reform Act for Virginia Power and deferrals of costs associated with certain current and prospective rider projects for Dominion Energy Gas. See Note 13 for more information.
[5]	Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion Energy's and Virginia Power's generation operations.
[6]	Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority.
[7]	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 and Dominion Energy Gas' rate-regulated subsidiaries.
[8]	Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more 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]	Ohio legislation under House Bill 95, which became effective in September 2011. This law updates natural gas legislation by enabling gas companies to include more up-to-date cost levels when filing rate cases. It also allows gas companies to seek approval of capital expenditure plans under which gas companies can recognize carrying costs on associated capital investments placed in service and can defer the carrying costs plus depreciation and property tax expenses for recovery from ratepayers in the future.
[11]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[12]	Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.

Regulatory Assets and Liabili83

Regulatory Assets and Liabilities (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Public Utilities, General Disclosures [Line Items]
Regulatory assets past expenditures not earning return		$ 382
Regulatory assets		$ 2,698	$ 2,480	[1]
Period for which expenditures are expected to be recovered		2 years
PJM transmission rates
Public Utilities, General Disclosures [Line Items]
Regulatory assets	[2]	$ 229	222
Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Regulatory assets past expenditures not earning return		304
Regulatory assets		1,009	810	[3]
Virginia Electric and Power Company | PJM transmission rates
Public Utilities, General Disclosures [Line Items]
Regulatory assets	[2]	$ 229	$ 222
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more information.
[3]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Detail) customer in Millions		1 Months Ended							3 Months Ended	12 Months Ended
		Apr. 30, 2018USD ($)customer	Feb. 28, 2018USD ($)	Jun. 30, 2016USD ($)	Apr. 30, 2016	Aug. 31, 2009kV	Apr. 30, 2008	Apr. 30, 2007kV	Mar. 31, 2018USD ($)kVpower_stationmi	Dec. 31, 2017USD ($)
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent									$ 2,698,000,000	$ 2,480,000,000	[1]
Regulatory asset recovered through retail rates
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent	[2]								229,000,000	222,000,000
Virginia Regulation | Operating Segments
Public Utilities General Disclosures [Line Items]
Charge associated with legislation									215,000,000
Charge associated with legislation, after tax									160,000,000
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
ROE (percentage)							11.40%
Regulatory assets-noncurrent									1,009,000,000	810,000,000	[3]
Virginia Electric and Power Company | Regulatory asset recovered through retail rates
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent	[2]								$ 229,000,000	222,000,000
Virginia Electric and Power Company | Virginia Regulation
Public Utilities General Disclosures [Line Items]
Earnings above authorized return on equity (basis points)									0.70%
One-time bill credit, provisions for current customers									$ 200,000,000
Virginia Electric and Power Company | Virginia Regulation | Double Circuit Transmission Line Between Near Gainesville Substation And Haymarket Substation
Public Utilities General Disclosures [Line Items]
Capacity of transmission line (kV) | kV									230
Length of kV line (miles) | mi									5
Virginia Electric and Power Company | Virginia Regulation | Operating Segments
Public Utilities General Disclosures [Line Items]
Charge associated with legislation									$ 215,000,000
Charge associated with legislation, after tax									160,000,000
Reduction in base rate on annual basis									$ 125,000,000
Virginia Electric and Power Company | Virginia Regulation | Rider B
Public Utilities General Disclosures [Line Items]
ROE (percentage)									11.20%
Number of power stations converted to biomass | power_station									3
Approved revenue required			$ 47,000,000
Proposed revenue requirement									$ 42,000,000
Virginia Electric and Power Company | Virginia Regulation | Rider U
Public Utilities General Disclosures [Line Items]
Approved revenue required									73,000,000
Phase of conversions									179,000,000
Phase of conversions not previously approved for recovery									65,000,000
Virginia Electric and Power Company | Settled Litigation | Federal Energy Regulatory Commission | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action
Public Utilities General Disclosures [Line Items]
Amount required to pay under settlement agreement (in excess of $200 million)				$ 200,000,000
Duration of payment under settlement agreement				10 years
Amount of contingent liability									239,000,000
Virginia Electric and Power Company | Settled Litigation | Federal Energy Regulatory Commission | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action | Regulatory asset recovered through retail rates
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent									229,000,000
Virginia Electric and Power Company | Minimum
Public Utilities General Disclosures [Line Items]
Facility operating capacity (kV) | kV								500
Virginia Electric and Power Company | Minimum | Judicial Ruling
Public Utilities General Disclosures [Line Items]
Facility operating capacity (kV) | kV						500
DETI | Federal Energy Regulatory Commission | Other operations and maintenance | Preliminary recommendation one
Public Utilities General Disclosures [Line Items]
Audit compliance charge recognized in connection with preliminary recommendation										15,000,000
Audit compliance after-tax charge recognized in connection with preliminary recommendation										9,000,000
DETI | Federal Energy Regulatory Commission | Other operations and maintenance | Other preliminary recommendation
Public Utilities General Disclosures [Line Items]
Audit compliance charge recognized in connection with preliminary recommendation										0
Audit compliance after-tax charge recognized in connection with preliminary recommendation										0
East Ohio | Ohio Regulation | Pipeline Infrastructure Replacement Program
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement									165,000,000
Percentage replacement of pipeline system					25.00%
Total estimated cost									$ 1,400,000,000	$ 204,000,000
East Ohio | Ohio Regulation | Automated Meter Reading Program
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement		$ 5,000,000
Number of customers with automated meter reading technology | customer		1.2
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Reflects amounts related to the PJM transmission cost allocation matter. See Note 13 for more information.
[3]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)MWgenerator	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)		Sep. 30, 2017generator
Variable Interest Entity [Line Items]
Securities due within one year	$ 3,603		$ 3,078	[1]
Long term debt	31,120		30,948	[1]
Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Securities due within one year	600		850	[2]
Long term debt	11,090		10,496	[2]
Affiliated current borrowings	11		33	[2]
Dominion Energy Gas Holdings, LLC
Variable Interest Entity [Line Items]
Long term debt	3,579		3,570	[3]
Affiliated current borrowings	41		18	[3]
Variable Interest Entity, Primary Beneficiary | SBL Holdco
Variable Interest Entity [Line Items]
Securities due within one year	30
Long term debt	$ 332
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Long term capacity contract non utility generators (generators) | generator	3
Long term capacity contract non utility generators expired | generator					2
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW	218
Remaining purchase commitments	$ 188
Payment for electric capacity	13	$ 28
Payment for electric energy	5	8
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES
Variable Interest Entity [Line Items]
Shared services purchased	89	85
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Payables to Affiliates
Variable Interest Entity [Line Items]
Affiliated current borrowings	43		36
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES
Variable Interest Entity [Line Items]
Shared services purchased	32	$ 31
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES | Payables to Affiliates
Variable Interest Entity [Line Items]
Affiliated current borrowings	$ 11		$ 14
[1]	Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Significant Financing Transac86

Significant Financing Transactions (Narrative) (Detail)

1 Months Ended

2 Months Ended

3 Months Ended

Apr. 30, 2018USD ($)$ / shares

Mar. 31, 2018USD ($)facility

Feb. 28, 2018USD ($)agreement

Jan. 31, 2018USD ($)shares

Jun. 30, 2017USD ($)agreement

Apr. 30, 2018USD ($)$ / sharesshares

Mar. 31, 2018USD ($)facilityshares

Mar. 31, 2017USD ($)shares

May 03, 2018USD ($)

Dec. 31, 2017USD ($)

Debt Instrument [Line Items]

Number of joint revolving credit facilities | facility

2

2

Short-term debt

$ 2,713,000,000

$ 2,713,000,000

$ 3,298,000,000

[1]

Issuance of common stock

580,000,000

$ 79,000,000

Aggregate proceeds from issuance of shares of common stock

$ 581,000,000

$ 79,000,000

Common Stock

Debt Instrument [Line Items]

Issuance of common stock (in shares) | shares

8,000,000

1,000,000

Issuance of common stock

$ 580,000,000

$ 79,000,000

Shelf Registration For Sale Of Common Stock Through At Market Program

Debt Instrument [Line Items]

Number of sales agency agreements | agreement

6

3

Issuance of common stock (in shares) | shares

6,600,000

Issuance of common stock

$ 0

$ 495,000,000

Fees and commissions paid

5,000,000

Shelf Registration For Sale Of Common Stock Through At Market Program | Maximum

Debt Instrument [Line Items]

Sale of stock authorized amount

1,000,000,000

$ 500,000,000

Subsequent Event | Common Stock | Forward Sale Agreements

Debt Instrument [Line Items]

Issuance of shares of common stock under forward equity sale agreement | shares

20,000,000

Aggregate proceeds from issuance of shares of common stock

$ 1,500,000,000

Subsequent Event | Maximum | Common Stock | Forward Sale Agreements

Debt Instrument [Line Items]

Full physical settlement of forward sale agreements date

Dec. 31, 2018

Subsequent Event | Underwriters Option to Purchase | Common Stock | Forward Sale Agreements

Debt Instrument [Line Items]

Issuance of shares of common stock under option to purchase | shares

2,100,000

Issuance of shares of common stock under option to purchase, price per share | $ / shares

$ 67.33

$ 67.33

Period to purchase common stock under option

30 days

Subsequent Event | Underwriters Option to Purchase | Maximum | Common Stock | Forward Sale Agreements

Debt Instrument [Line Items]

Issuance of shares of common stock under option to purchase | shares

3,000,000

Dominion Energy Midstream Partners, LP | Revolving Credit Facility

Debt Instrument [Line Items]

Facility Limit

500,000,000

500,000,000

Guarantee recorded amount

$ 0

0

Line of credit facility maturity date

Mar. 31, 2021

Dominion Energy Midstream Partners, LP | Revolving Credit Facility | Letter of Credit

Debt Instrument [Line Items]

Facility Limit

$ 250,000,000

250,000,000

Dominion Energy Midstream Partners, LP | Revolving Credit Facility | Subsequent Event

Debt Instrument [Line Items]

Guarantee recorded amount

$ 73,000,000

Virginia Electric and Power Company

Debt Instrument [Line Items]

Short-term debt

426,000,000

426,000,000

$ 542,000,000

[2]

Credit facility

100,000,000

$ 100,000,000

Issuance of common stock (in shares) | shares

0

0

Virginia Electric and Power Company | Tax Exempt Financing

Debt Instrument [Line Items]

Repayment of variable rate tax-exempt financings

100,000,000

$6 billion Joint Revolving Credit Facility

Debt Instrument [Line Items]

Facility Limit

[3]

6,000,000,000

$ 6,000,000,000

$6 billion Joint Revolving Credit Facility | Questar Gas

Debt Instrument [Line Items]

Facility Limit

250,000,000

250,000,000

$6 billion Joint Revolving Credit Facility | Virginia Electric and Power Company

Debt Instrument [Line Items]

Facility Limit

[4]

6,000,000,000

6,000,000,000

Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco

Debt Instrument [Line Items]

Facility Limit

30,000,000

$ 30,000,000

Automatic renewal period

1 year

Short-term debt

0

$ 0

Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024 | Dominion Solar Projects III, Inc

Debt Instrument [Line Items]

Facility Limit

25,000,000

$ 25,000,000

Automatic renewal period

1 year

Short-term debt

0

$ 0

Term Loan Credit Agreement

Debt Instrument [Line Items]

Guarantee recorded amount

$ 950,000,000

Duration of credit facilities

364 days

Maximum allowed total debt to total capital ratio

67.50%

3.53% Due 2028 | Dominion Energy Midstream Partners, LP | Private Placement

Debt Instrument [Line Items]

Total Long-term Debt

$ 100,000,000

Interest rate percentage

3.53%

Debt maturity year

2,028

3.91% Due 2038 | Dominion Energy Midstream Partners, LP | Private Placement

Debt Instrument [Line Items]

Total Long-term Debt

$ 150,000,000

Interest rate percentage

3.91%

Debt maturity year

2,038

Senior Notes, Due in 2028 | Virginia Electric and Power Company | Senior Notes

Debt Instrument [Line Items]

Total Long-term Debt

$ 700,000,000

$ 700,000,000

Interest rate percentage

3.80%

3.80%

Debt maturity year

2,028

3.30% Due 2030 | Questar Gas | Subsequent Event | Private Placement

Debt Instrument [Line Items]

Total Long-term Debt

$ 50,000,000

$ 50,000,000

Interest rate percentage

3.30%

3.30%

Debt maturity year

2,030

3.97% Due 2047 | Questar Gas | Subsequent Event | Private Placement

Debt Instrument [Line Items]

Total Long-term Debt

$ 100,000,000

$ 100,000,000

Interest rate percentage

3.97%

3.97%

Debt maturity year

2,047

[1]

Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

[2]

Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

[3]

This credit facility matures in March 2023 and can be used by the Companies 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.

[4]

The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.

Significant Financing Transac87

Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Detail) - $6 billion Joint Revolving Credit Facility	Mar. 31, 2018USD ($)
Line of Credit Facility [Line Items]
Facility Limit	$ 6,000,000,000	[1]
Outstanding Commercial Paper	2,712,000,000	[1]
Outstanding Letters of Credit	72,000,000	[1]
Facility Capacity Available	3,216,000,000	[1]
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	6,000,000,000	[2]
Outstanding Commercial Paper	426,000,000	[2]
Outstanding Letters of Credit	1,000,000	[2]
Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	1,500,000,000	[3]
Outstanding Commercial Paper	614,000,000	[3]
Outstanding Letters of Credit	$ 0	[3]
[1]	This credit facility matures in March 2023 and can be used by the Companies to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[3]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

Significant Financing Transac88

Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail) - $6 billion Joint Revolving Credit Facility	Mar. 31, 2018USD ($)
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]
Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	1,500,000,000	[3]
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
Letter of Credit | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	1,500,000,000
Line of Credit | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	1,500,000,000
Line of Credit | Dominion Energy Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	$ 750,000,000
[1]	This credit facility matures in March 2023 and can be used by the Companies to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2]	The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[3]	A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

Commitments and Contingencies89

Commitments and Contingencies (Narrative) (Detail)

1 Months Ended

3 Months Ended

Sep. 30, 2017petition

Jul. 31, 2017

Jun. 30, 2017

May 31, 2017count

Apr. 30, 2017petitionstation

Mar. 31, 2017count

Aug. 31, 2016T

Jul. 31, 2016party

Oct. 31, 2015ppb

Jun. 30, 2015party

Apr. 30, 2015facility

Oct. 31, 2014facilitygal

Jun. 30, 2014

Sep. 30, 2013Bcfe / d

Mar. 31, 2018USD ($)facilitysiteparty

Apr. 30, 2016USD ($)

Jul. 31, 2013count

Ozone Standards | EPA | Maximum

Loss Contingencies [Line Items]

Maximum period to develop plans to address new standard

3 years

CWA | Virginia Electric and Power Company | Minimum | Chesapeake Power Station | Judicial Ruling

Loss Contingencies [Line Items]

Additional specific sediment, water and aquatic life monitoring period

2 years

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

Loss Contingencies [Line Items]

Compliance date

2023-12

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

Loss Contingencies [Line Items]

Compliance date

2020-11

CCR | EPA

Loss Contingencies [Line Items]

Number of petition agreed for reconsideration | petition

2

Unfavorable Regulatory Action | Maximum | Non-FTA

Loss Contingencies [Line Items]

Authorization export approval of natural gas per day | Bcfe / d

0.77

Unfavorable Regulatory Action | EPA

Loss Contingencies [Line Items]

Significant emission rate per rear CO2 equivalent | T

75,000

Electric generating station facilities heightened entrainment analysis per day | gal

125,000,000

Unfavorable Regulatory Action | MATS | EPA

Loss Contingencies [Line Items]

Requested compliance extension under EPA Administrative Order

1 year

Extension period for MATS compliance

1 year

Unfavorable Regulatory Action | MATS | EPA | Virginia Electric and Power Company

Loss Contingencies [Line Items]

Number of effective days to operate power station units

90 days

Period to be in service following receipt of all required permits

23 months

Unfavorable Regulatory Action | Ozone Standards | EPA

Loss Contingencies [Line Items]

Standard emission level prior to revision | ppb

75

Revised emission standard level | ppb

70

Unfavorable Regulatory Action | Ozone Standards | EPA | Minimum

Loss Contingencies [Line Items]

Estimated compliance costs

$ 25,000,000

Unfavorable Regulatory Action | Ozone Standards | EPA | Maximum

Loss Contingencies [Line Items]

Estimated compliance costs

$ 35,000,000

Unfavorable Regulatory Action | Regulationsto Reduce Nitrogen Oxide And Volatile Organic Compounds Emissions | Pennsylvania Department Of Environmental Protection | Dominion Gas Holdings L L C

Loss Contingencies [Line Items]

Estimated compliance costs

$ 35,000,000

Unfavorable Regulatory Action | Oil And Gas New Source Performance Standards

Loss Contingencies [Line Items]

Number of period court appeals DC vacated stay

90 days

Unfavorable Regulatory Action | Oil And Gas New Source Performance Standards | EPA

Loss Contingencies [Line Items]

Requested compliance extension under EPA Administrative Order

2 years

EPA notice issued reviewing month and year

2017-04

Number of period EPA published notice of reconsideration and partial stay

90 days

Unfavorable Regulatory Action | CWA

Loss Contingencies [Line Items]

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

13

Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company

Loss Contingencies [Line Items]

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

11

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

Loss Contingencies [Line Items]

Number of facilities that maybe subject to additional wastewater treatment requirements | facility

8

Number of separate petitions for reconsideration granted | petition

2

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

Loss Contingencies [Line Items]

Number of former manufactured gas plant sites | site

19

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

Loss Contingencies [Line Items]

Number of former sites | site

1

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company

Loss Contingencies [Line Items]

Number of former manufactured gas plant sites | site

3

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Minimum

Loss Contingencies [Line Items]

Estimated compliance costs

$ 1,000,000

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Maximum

Loss Contingencies [Line Items]

Estimated compliance costs

$ 22,000,000

Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Dominion Energy Gas Holdings, LLC

Loss Contingencies [Line Items]

Number of former manufactured gas plant sites | site

12

Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to CCR Final Rule

Loss Contingencies [Line Items]

Number of facilities with CCR | facility

8

Number of stations | station

4

Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Minimum

Loss Contingencies [Line Items]

Estimated compliance costs

$ 100,000,000

Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Maximum

Loss Contingencies [Line Items]

Estimated compliance costs

200,000,000

Breach of Contract Lawsuit | DETI | Pending Litigation

Loss Contingencies [Line Items]

Total number of counts in complaint | count

8

Accrued liability for legal matter

$ 7,000,000

Breach of Contract Lawsuit | DETI | Judicial Ruling

Loss Contingencies [Line Items]

Number of counts dismissed | count

3

Breach of Contract Lawsuit | DETI | Settled Litigation

Loss Contingencies [Line Items]

Number of claims withdrew | count

1

Liquefaction Project | FERC-regulated | Cove Point | Pending Litigation

Loss Contingencies [Line Items]

Number of parties | party

2

Liquefaction Project | FERC-regulated | Cove Point | Judicial Ruling

Loss Contingencies [Line Items]

Number of parties | party

1

1

Commitments and Contingencies90

Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - Kewaunee $ in Millions	Mar. 31, 2018USD ($)
Loss Contingencies [Line Items]
Liability coverage	$ 100
Property insurance limit	$ 50

Commitments and Contingencies91

Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($)		1 Months Ended	3 Months Ended
		Oct. 31, 2017	Mar. 31, 2018
Guarantee Obligations [Line Items]
Maximum Exposure	[1]		$ 5,770,000,000
Nuclear Obligations
Guarantee Obligations [Line Items]
Maximum Exposure	[2]		228,000,000
Commodity Transactions
Guarantee Obligations [Line Items]
Maximum Exposure	[3]		2,149,000,000
Cove Point
Guarantee Obligations [Line Items]
Maximum Exposure	[4]		1,900,000,000
Financial Guarantee | Equity Method Investees
Guarantee Obligations [Line Items]
Maximum Exposure			48,000,000
Financial Guarantee | Affiliated Entity
Guarantee Obligations [Line Items]
Maximum Exposure			10,000,000
Financial Guarantee | Affiliated Entity | Minimum
Guarantee Obligations [Line Items]
Annual future contributions			4,000,000
Financial Guarantee | Affiliated Entity | Maximum
Guarantee Obligations [Line Items]
Annual future contributions			6,000,000
Financial Guarantee | Atlantic Coast Pipeline | Revolving Credit Facility
Guarantee Obligations [Line Items]
Facility Limit		$ 3,400,000,000
Revolving credit facility stated maturity date		Oct. 31, 2021
Maximum potential loss exposure, limited guarantee percentage		48.00%
Guarantee liability			27,000,000
Guarantee recorded amount			737,000,000
Solar
Guarantee Obligations [Line Items]
Maximum Exposure	[5]		942,000,000
Other
Guarantee Obligations [Line Items]
Maximum Exposure	[6]		551,000,000
Surety Bond
Guarantee Obligations [Line Items]
Maximum Exposure			155,000,000
Surety Bond | Virginia Electric and Power Company
Guarantee Obligations [Line Items]
Maximum Exposure			69,000,000
Surety Bond | Dominion Energy Gas Holdings, LLC
Guarantee Obligations [Line Items]
Maximum Exposure			25,000,000
Letters of Credit by Financial Institutions
Guarantee Obligations [Line Items]
Maximum Exposure			$ 72,000,000
[1]	Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2017.
[2]	Guarantees related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[3]	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.
[4]	Guarantees related to Cove Point, in support of terminal services, transportation and construction.
[5]	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.
[6]	Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of March 31, 2018, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $10 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $6 million.

Credit Risk (Narrative) (Detail

Credit Risk (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)counterparty	Dec. 31, 2017USD ($)
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure	$ 112
Credit exposure reduced amount	108
Additional collateral to be posted if the credit related contingent features were triggered	1	$ 62
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position	2	$ 65
Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure	55
Wholesale Customers | Dominion Energy Gas Holdings, LLC
Concentration Risk and Guarantor Obligations [Line Items]
Gross credit exposure	$ 8
Credit Concentration Risk
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty	0
Amount of exposure for single counterparty	$ 31
Credit Concentration Risk | Dominion Energy Gas Holdings, LLC
Concentration Risk and Guarantor Obligations [Line Items]
Number of counterparties | counterparty	0
Amount of exposure for single counterparty	$ 2
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 related to sales to wholesale customers for single counterparty	$ 9
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	51.00%
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty | Virginia Electric and Power Company
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	25.00%
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty | Dominion Energy Gas Holdings, LLC
Concentration Risk and Guarantor Obligations [Line Items]
Concentration risk, percentage (percentage)	14.00%

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Derivative Asset	$ 244,000,000			$ 307,000,000
Derivative Liabilities	90,000,000			284,000,000
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Derivative Asset	129,000,000	[1]		166,000,000
Derivative Liabilities	23,000,000			66,000,000
Short term demand note	11,000,000			33,000,000	[2]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries	$ 0			0
Issuance of common stock (in shares)	0		0
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due to Dominion, noncurrent	$ 537,000,000			505,000,000
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	218,000,000			199,000,000
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Derivative Asset	5,000,000			11,000,000
Derivative Liabilities	7,000,000			5,000,000
Virginia Electric and Power Company | Principal Owner
Related Party Transaction [Line Items]
Short term demand note	11,000,000			33,000,000
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Derivative Asset	44,000,000			32,000,000
Derivative Liabilities	1,000,000			8,000,000
Short term demand note	41,000,000			18,000,000	[3]
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA
Related Party Transaction [Line Items]
Short term demand note	41,000,000			18,000,000
Dominion Energy Gas Holdings, LLC | Maximum
Related Party Transaction [Line Items]
Derivative Asset	1,000,000
Derivative Liabilities	1,000,000
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent	744,000,000			734,000,000
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan
Related Party Transaction [Line Items]
Amounts due from Dominion, noncurrent	$ 9,000,000			$ 7,000,000
[1]	Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2]	Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

Related-Party Transactions (Det

Related-Party Transactions (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Capital expenditures		$ 1,103	$ 1,435
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Commodity purchases from affiliates		398	212
Services provided by affiliates	[1]	120	112
Capital expenditures		570	647
Virginia Electric and Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties		6	5
Virginia Electric and Power Company | Affiliated Entity | Services provided by affiliates
Related Party Transaction [Line Items]
Capital expenditures		37	34
Dominion Energy Gas Holdings, LLC
Related Party Transaction [Line Items]
Commodity purchases from affiliates		3
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties	[2]	52	39
Capital expenditures		138	134
Other receivables	[3]	17		$ 12
Customer receivables from related parties				1
Affiliated notes receivable	[4]	19		20
Dominion Energy Gas Holdings, LLC | Services provided by affiliates
Related Party Transaction [Line Items]
Services provided by affiliates	[5]	33	35
Dominion Energy Gas Holdings, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties		18	18
Imbalances receivable from affiliates				$ 1
Dominion Energy Gas Holdings, LLC | Affiliated Entity | Services provided by affiliates
Related Party Transaction [Line Items]
Capital expenditures		$ 10	$ 8
[1]	Includes capitalized expenditures of $37 million and $34 million for the three months ended March 31, 2018 and 2017, respectively.
[2]	Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE.
[3]	Represents amounts due from Atlantic Coast Pipeline, a related-party VIE.
[4]	Amounts are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.
[5]	Includes capitalized expenditures of $10 million and $8 million for the three months ended March 31, 2018 and 2017, respectively.

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 39	$ 35
Interest cost		84	86
Expected return on plan assets		(165)	(159)
Amortization of prior service credit		0	0
Amortization of net actuarial loss		48	40
Settlements		0	1
Net periodic benefit cost (credit)	[1]	6	3
Pension Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost		4	4
Interest cost		7	7
Expected return on plan assets		(37)	(35)
Amortization of prior service credit		0	0
Amortization of net actuarial loss		5	4
Net periodic benefit cost (credit)	[2]	(21)	(20)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		7	7
Interest cost		14	16
Expected return on plan assets		(36)	(32)
Amortization of prior service credit		(13)	(12)
Amortization of net actuarial loss		3	3
Settlements		0	0
Net periodic benefit cost (credit)	[1]	(25)	(18)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1
Interest cost		3	3
Expected return on plan assets		(8)	(6)
Amortization of prior service credit		(1)	0
Amortization of net actuarial loss		1	1
Net periodic benefit cost (credit)	[2]	$ (4)	$ (1)
[1]	The components of net periodic benefit cost (credit) other than the service cost component are included in other income in the Consolidated Statements of Income.
[2]	The components of net periodic benefit credit other than the service cost component are included in other income in the Consolidated Statements of Income.

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans and OPEB plans	$ 0
Expected contribution to voluntary employees' beneficiary association for the remainder of 2018	12,000,000
Dominion Energy Gas Holdings, LLC
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans and OPEB plans	0
Expected contribution to voluntary employees' beneficiary association for the remainder of 2018	$ 12,000,000

Operating Segments (Narrative)

Operating Segments (Narrative) (Detail) - Operating Segments - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
After- tax net (expenses) benefit	$ (218)
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net (expenses) benefit	(189)
Storm damage and service restoration costs associated with winter storm riley	31
Storm damage and service restoration costs associated with winter storm riley, after tax	23
Virginia Regulation
Segment Reporting Information [Line Items]
Charge associated with legislation enacted	215
Charge associated with legislation enacted, after tax	160
Virginia Regulation | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Charge associated with legislation enacted	215
Charge associated with legislation enacted, after tax	160
Decommissioning Trust Fund
Segment Reporting Information [Line Items]
Loss on investments held in nuclear decommissioning trust funds	43
Loss on investments held in nuclear decommissioning trust funds, after tax	32
Net gain on investments held in nuclear decommissioning trust funds			$ 34
Net gain on investments held in nuclear decommissioning trust funds, after tax			$ 21
Corporate and Other
Segment Reporting Information [Line Items]
After- tax net (expenses) benefit	(238)	$ 21
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net (expenses) benefit	(197)	2
Corporate and Other | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
After- tax net (expenses) benefit	0	$ 0
Power Generation | Virginia Regulation
Segment Reporting Information [Line Items]
Charge associated with legislation enacted, after tax	109
Power Generation | Virginia Regulation | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Charge associated with legislation enacted, after tax	109
Power Delivery | Virginia Regulation
Segment Reporting Information [Line Items]
Charge associated with legislation enacted, after tax	51
Power Delivery | Virginia Regulation | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Charge associated with legislation enacted, after tax	$ 51

Operating Segments (Schedule of

Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Operating revenue	[1]	$ 3,466	$ 3,384
Net income (loss) attributable to Dominion Energy		503	632
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue	[2]	1,748	1,831
Net income (loss) attributable to Dominion Energy		184	356
Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue	[3]	526	490
Net income (loss) attributable to Dominion Energy		166	108
Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue		(189)	(426)
Operating Segments
Segment Reporting Information [Line Items]
Operating revenue		3,466	3,384
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Operating revenue		28	273
Net income (loss) attributable to Dominion Energy		0	0
Eliminations
Segment Reporting Information [Line Items]
Operating revenue		(161)	(153)
Power Delivery
Segment Reporting Information [Line Items]
Operating revenue		563	554
Net income (loss) attributable to Dominion Energy		156	125
Power Delivery | Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue		6	5
Power Delivery | Operating Segments
Segment Reporting Information [Line Items]
Operating revenue		569	559
Power Delivery | Operating Segments | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue		563	557
Net income (loss) attributable to Dominion Energy		154	125
Power Generation
Segment Reporting Information [Line Items]
Operating revenue		1,860	1,653
Net income (loss) attributable to Dominion Energy		348	261
Power Generation | Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue		2	3
Power Generation | Operating Segments
Segment Reporting Information [Line Items]
Operating revenue		1,862	1,656
Power Generation | Operating Segments | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue		1,400	1,274
Net income (loss) attributable to Dominion Energy		222	223
Gas Infrastructure
Segment Reporting Information [Line Items]
Operating revenue		1,222	901
Net income (loss) attributable to Dominion Energy		327	263
Gas Infrastructure | Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue		6	266
Gas Infrastructure | Operating Segments
Segment Reporting Information [Line Items]
Operating revenue		1,228	1,167
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue		526	490
Net income (loss) attributable to Dominion Energy		167	109
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenue		(207)	3
Net income (loss) attributable to Dominion Energy		(328)	(17)
Corporate and Other | Intersegment revenue
Segment Reporting Information [Line Items]
Operating revenue		175	152
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating revenue		(32)	155
Corporate and Other | Operating Segments | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating revenue		(215)
Net income (loss) attributable to Dominion Energy		(192)	8
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating revenue		0	0
Net income (loss) attributable to Dominion Energy		$ (1)	$ (1)
[1]	See Note 10 for amounts attributable to related parties.
[2]	See Note 18 for amounts attributable to affiliates.
[3]	See Note 18 for amounts attributable to related parties.