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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Dec. 31, 2022 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 146
Due after one year through five years | 511
Due after five years through ten years | 442
Due after ten years | 761
Total | 1,860
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 80
Due after one year through five years | 280
Due after five years through ten years | 279
Due after ten years | 413
Total | $ 1,052

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