Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($)
Unrecognized Tax Benefits [Line Items]
Balance at January 1, 2025	$ 170
Prior period positions - increases	0
Prior period positions - decreases	(38)
Current period positions - increases	3
Settlements with tax authorities	0
Expiration of statutes of limitations	0
Balance at June 30, 2025	135
Virginia Electric and Power Company
Unrecognized Tax Benefits [Line Items]
Balance at January 1, 2025	56
Prior period positions - increases	0
Prior period positions - decreases	0
Current period positions - increases	2
Settlements with tax authorities	0
Expiration of statutes of limitations	0
Balance at June 30, 2025	$ 58

Unrecognized tax benefits.

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Amount of unrecognized tax benefits.

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-Topic 740
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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