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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Sep. 30, 2019 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 212
Due after one year through five years | 412
Due after five years through ten years | 360
Due after ten years | 719
Total | 1,703
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 99
Due after one year through five years | 183
Due after five years through ten years | 180
Due after ten years | 377
Total | $ 839

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