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v3.23.1

Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Mar. 31, 2023 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 90
Due after one year through five years | 500
Due after five years through ten years | 420
Due after ten years | 876
Total | 1,886
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 58
Due after one year through five years | 274
Due after five years through ten years | 245
Due after ten years | 503
Total | $ 1,080

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