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Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions | 9 Months Ended
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Sep. 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 September 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 September 30, 2025 | $ 58

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