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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 414	$ 360	$ 384	$ 86
Total realized and unrealized gains (losses):
Operating Revenue	(24)	13	(14)	7
Included in earnings	$ 115	$ 14	$ 233	$ (134)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases
Included in regulatory assets/liabilities	$ 33	$ (77)	$ 76	$ 230
Settlements	(126)	(40)	(275)	54
Purchases	0	2	8	30
Transfers out of Level 3	(1)	0	(1)	0
Ending balance	411	269	411	269
Virginia Electric and Power Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	179	105	68	(116)
Total realized and unrealized gains (losses):
Included in earnings	$ 106	$ 10	$ 222	$ (136)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases	Electric fuel and other energy-related purchases
Included in regulatory assets/liabilities	$ (11)	$ (7)	$ 102	$ 219
Settlements	(106)	(17)	(232)	103
Purchases	0	0	8	21
Ending balance	168	91	168	91
Discontinued Operations
Total realized and unrealized gains (losses):
Included in earnings	$ 0	$ (3)	$ (0)	$ (4)

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Fair value net derivative asset liability measured on recurring basis unobservable inputs reconciliation regulated operating revenue.

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Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Total Gains Losses Realized Unrealized [Abstract]

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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