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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail) $ in Millions | Jun. 30, 2019 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | $ 203
Due after one year through five years | 397
Due after five years through ten years | 387
Due after ten years | 688
Total | 1,675
Virginia Electric and Power Company |
Schedule of Held-to-maturity Securities [Line Items] |
Due in one year or less | 98
Due after one year through five years | 154
Due after five years through ten years | 212
Due after ten years | 357
Total | $ 821

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