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

[1] See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.

[2] See Note 3 for noncash investing and financing activities related to the SCANA Combination.

[3] See Note 5 for noncash activities related to the sale of a noncontrolling interest in Cove Point.

[4] See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler.

[5] See Notes 18,19 and 20 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream, the remarketing of RSNs, the issuance of stock purchase contracts associated with the 2019 Equity Units and the contribution of stock to Dominion Energy’s qualified defined benefit pension plan.

[6] Includes $113 million of finance leases and $44 million of operating leases.

[7] Includes $20 million of finance leases and $35 million of operating leases.

[8] See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for lease arrangements.

[9] See Notes 3 and 25 for noncash investing and financing activities related to the Dominion Energy Gas Restructuring and related-party transactions.