Significant Accounting Policies (Schedule of Increase (Decrease) to Each Affected Line Item in Companies' Consolidated Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended								12 Months Ended
		Dec. 31, 2021	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense		$ 173									$ 575	$ 113	$ (181)
Net income from continuing operations											2,157	427	2,041
Net income from discontinued operations											$ (163)	$ 894	$ 1,358
Earnings per share			$ 0.3	$ 0.16	$ 0.67	$ 1.15	$ 0.39	$ 0.86	$ (0.58)	$ 0.82	$ 2.29	$ 1.49	$ 4.12
Impairment of assets and other charges											$ 307	$ 1,401	$ 194
Losses (gains) on sales of assets												(27)	(685)
Depreciation and amortization											2,580	2,442	2,117
Deferred income taxes and investment tax credits			$ 6,611				$ 5,021				6,611	5,021
Noncurrent regulatory liabilities			8,674				8,435				8,674	8,435
Property, plant and equipment			58,780				52,312				58,780	52,312
Accumulated depreciation and amortization			24,637				23,396				24,637	23,396
Intangible assets, net			945				813				945	813
Operating lease assets	[1]		578				473				578	473
Change in Method of Accounting for Investment Tax Credits at Nonregulated Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense											(19)	94	(340)
Net income from continuing operations	[2]										19	$ (94)	$ 340
Net income from discontinued operations	[3]										$ 13
Earnings per share	[2]										$ 0.04	$ (0.11)	$ 0.42
Deferred income taxes and investment tax credits			589				625				$ 589	$ 625
Noncurrent regulatory liabilities			23				18				23	18
Other Impacts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	[4]										(4)	139	$ (81)
Net income from continuing operations	[4],[5],[6]										$ (14)	$ 421	$ (230)
Earnings per share	[4],[5]										$ (0.02)	$ 0.51	$ (0.28)
Impairment of assets and other charges	[4]											$ (560)
Losses (gains) on sales of assets	[4]												$ (303)
Depreciation and amortization	[4]										$ 18		13
Other Impacts | Change in Method of Accounting for Investment Tax Credits at Nonregulated Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes and investment tax credits	[7]		135				139				135	139
Property, plant and equipment	[7]		533				533				533	533
Accumulated depreciation and amortization	[7]		60				44				60	44
Intangible assets, net	[7]		14				14				14	14
Operating lease assets	[7],[8]		55				57				55	57
Virginia Power
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense											389	294	447
Depreciation and amortization											1,871	1,736	1,364
Deferred income taxes and investment tax credits			3,624				3,065				3,624	3,065
Noncurrent regulatory liabilities			5,978				5,517				5,978	5,517
Property, plant and equipment			43,867				38,479				43,867	38,479
Accumulated depreciation and amortization			17,096				16,218				17,096	16,218
Intangible assets, net			653				536				653	536
Operating lease assets	[1]		393				294				393	294
Virginia Power | Change in Method of Accounting for Investment Tax Credits at Nonregulated Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense											(9)	103	50
Net income from continuing operations	[2]										9	(103)	$ (50)
Deferred income taxes and investment tax credits			264				278				264	278
Noncurrent regulatory liabilities			$ 23				$ 18				$ 23	$ 18

[1] Dominion Energy includes $561 million and $451 million at December 31, 2023 and 2022, respectively, in other deferred charges and other assets, with the remaining balance in noncurrent assets held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are included in other deferred charges and other assets in its Consolidated Balance Sheets.

[2] The impact to Dominion Energy's net income from continuing operations includes an increase (decrease) of $(13) million ($(0.02) per share), $(12) million ($(0.01) per share), $(15) million ($(0.02) per share) and $59 million ($0.07 per share) for the first, second, third and fourth quarters of 2023, respectively. Virginia Power's net income includes an increase of $2 million, $2 million, $2 million and $3 million for the first, second, third and fourth quarters of 2023, respectively.

[3] The impact to Dominion Energy's income tax expense presented within net income from discontinued operations resulted in an increase of $0.02 per share in the third quarter of 2023.

[4] Other impacts are primarily associated with the impairment of certain solar generation facilities held within Contracted Energy in 2022 and non-wholly-owned solar generation facilities sold in 2021.

[5] Includes a decrease of $6 million attributable to noncontrolling interests for the year ended December 31, 2021.

[6] The impact to Dominion Energy's net income from continuing operations includes a decrease of $3 million (less than $0.01 per share), $3 million (less than $0.01 per share), $4 million (less than $0.01 per share) and $4 million (less than $0.01 per share) for the first, second, third and fourth quarters of 2023, respectively.

[7] Other impacts are primarily associated with the impairment of certain solar generation facilities held within Contracted Energy in 2022 and non-wholly-owned solar generation facilities sold in 2021.

[8] Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.