Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2024	Dec. 31, 2023
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 835	$ 522	[1]
Regulatory liabilities-noncurrent		8,996	8,674	[1]
Total regulatory liabilities		9,831	9,196
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		612	321	[2]
Regulatory liabilities-noncurrent		6,298	5,978	[2]
Total regulatory liabilities		$ 6,910	6,299
SCANA
Regulatory Liabilities [Line Items]
Estimation period of collection to be credited		11 years
Electric service customers over period		20 years
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	$ 260	0
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	260	0
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	118	118
Regulatory liabilities-noncurrent	[4]	1,825	1,818
Provision for future cost of removal and AROs | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	118	118
Regulatory liabilities-noncurrent	[4]	1,190	1,185
Reserve for refunds and rate credits to electric utility customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	80	83
Regulatory liabilities-noncurrent	[5]	193	237
Reserve for refunds and rate credits to electric utility customers | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	0	0
Regulatory liabilities-noncurrent	[5]	0	0
Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[6]	107	107
Regulatory liabilities-noncurrent	[6]	3,016	3,076
Income taxes refundable through future rates | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[6]	70	70
Regulatory liabilities-noncurrent	[6]	2,195	2,237
Monetization of guarantee settlement
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[7]	67	67
Regulatory liabilities-noncurrent	[7]	$ 602	635
Electric service customers over period		20 years
Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[8]	$ 90	7
Regulatory liabilities-noncurrent	[8]	215	136
Derivatives | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[8]	73	0
Regulatory liabilities-noncurrent	[8]	0	0
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		113	140
Regulatory liabilities-noncurrent		248	286
Other | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		91	133
Regulatory liabilities-noncurrent		186	225
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[9]	2,374	2,098
Nuclear decommissioning trust | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[9]	2,373	2,098
Interest rate hedges
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[10]	354	233
Interest rate hedges | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[10]	354	233
Unrecognized Pension and Other Postretirement Benefit Costs | East Ohio, PSNC and Questar Gas
Regulatory Liabilities [Line Items]
Regulatory liabilities			12
Overrecovered Other Postretirement Benefit Costs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[11]	$ 169	$ 155

[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

[3] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s electric generation operations. Additionally, Dominion Energy includes deferred fuel expenses for the South Carolina jurisdiction of its electric generation operations. In February 2024, Virginia Power completed a securitization of $1.3 billion of under-recovered fuel costs for its Virginia service territory.

[4] Rates charged to customers by Dominion Energy and Virginia Power’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.

[5] Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period effective February 2019, in connection with the SCANA Merger Approval Order. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the settlement of the 2021 Triennial Review. See Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2023 for additional information.

[6] Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will primarily reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.

[7] Reflects amounts to be refunded to DESC electric service customers over a 20-year period ending in 2039 associated with the monetization of a bankruptcy settlement agreement.

[8] Represents changes in the fair value of derivatives, excluding separately presented interest rate hedges, that following settlement are expected to be recovered from or refunded to customers.

[9] Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs.

[10] Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 25 years and 24 years for Dominion Energy and Virginia Power, respectively, as of June 30, 2024.

[11] Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.