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Fair Value Measurements (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains (losses) included in operating revenue in Level 3 fair value category	$ (24,000,000)	$ 12,000,000	$ (14,000,000)	$ 7,000,000
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains (losses) included in operating revenue in Level 3 fair value category	$ 0	$ 0	$ 0	$ 0

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

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