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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Sep. 30, 2024 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 27
Due after one year through five years | 572
Due after five years through ten years | 459
Due after ten years | 1,218
Total | 2,276
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 18
Due after one year through five years | 299
Due after five years through ten years | 273
Due after ten years | 769
Total | $ 1,359

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