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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 187
Due after one year through five years | 382
Due after five years through ten years | 394
Due after ten years | 680
Total | 1,643
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 77
Due after one year through five years | 145
Due after five years through ten years | 219
Due after ten years | 359
Total | $ 800

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