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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Mar. 31, 2020 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 178
Due after one year through five years | 430
Due after five years through ten years | 389
Due after ten years | 750
Total | 1,747
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 73
Due after one year through five years | 200
Due after five years through ten years | 211
Due after ten years | 368
Total | $ 852

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