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Investments (Fair Value of our Marketable Debt Securities by Contractual Maturity) (Detail) $ in Millions | Dec. 31, 2019 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 198
Due after one year through five years | 412
Due after five years through ten years | 390
Due after ten years | 727
Total | 1,727
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 91
Due after one year through five years | 175
Due after five years through ten years | 206
Due after ten years | 381
Total | $ 853

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