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v3.25.1

Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Mar. 31, 2025 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 29
Due after one year through five years | 590
Due after five years through ten years | 382
Due after ten years | 1,268
Total | 2,269
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 19
Due after one year through five years | 314
Due after five years through ten years | 172
Due after ten years | 847
Total | $ 1,352

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