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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Dec. 31, 2024 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 7
Due after one year through five years | 565
Due after five years through ten years | 441
Due after ten years | 1,198
Total | 2,211
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 7
Due after one year through five years | 294
Due after five years through ten years | 251
Due after ten years | 766
Total | $ 1,318

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