Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 579	$ 522
Regulatory liabilities-noncurrent		9,196	8,674
Total regulatory liabilities		9,775	9,196
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		385	321
Regulatory liabilities-noncurrent		6,574	5,978
Total regulatory liabilities		$ 6,959	6,299
SCANA
Regulatory Liabilities [Line Items]
Estimation period of collection to be credited		11 years
Electric service customers over period		20 years
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	$ 119	118
Regulatory liabilities-noncurrent	[1]	1,809	1,818
Provision for future cost of removal and AROs | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	119	118
Regulatory liabilities-noncurrent	[1]	1,210	1,185
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[2]	92	0
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[2]	92	0
Reserve for rate credits to electric utility customers
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	73	83
Regulatory liabilities-noncurrent	[3]	161	237
Reserve for rate credits to electric utility customers | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	0	0
Regulatory liabilities-noncurrent	[3]	0	0
Income taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	88	107
Regulatory liabilities-noncurrent	[4]	2,988	3,076
Income taxes refundable through future rates | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	64	70
Regulatory liabilities-noncurrent	[4]	2,168	2,237
Monetization of guarantee settlement
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[5]	67	67
Regulatory liabilities-noncurrent	[5]	$ 568	635
Electric service customers over period		20 years
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 89	140
Regulatory liabilities-noncurrent		283	286
Other | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		80	133
Regulatory liabilities-noncurrent		215	225
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	2,550	2,098
Nuclear decommissioning trust | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	2,550	2,098
Interest rate hedges
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	406	233
Interest rate hedges | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	406	233
Overrecovered Other Postretirement Benefit Costs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[8]	183	155
Unrecognized Pension and Other Postretirement Benefit Costs | East Ohio, PSNC and Questar Gas
Regulatory Liabilities [Line Items]
Regulatory liabilities			12
Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[9]	51	7
Regulatory liabilities-noncurrent	[9]	248	136
Derivatives | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[9]	30	0
Regulatory liabilities-noncurrent	[9]	$ 25	$ 0

[1] 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.

[2] 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.

[3] 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.

[4] 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.

[5] 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.

[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, as applicable) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs.

[7] Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 25 years and 24 years for Dominion Energy and Virginia Power, respectively, as of December 31, 2024.

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

[9] 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.