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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail)
$ in Millions
Sep. 30, 2023
USD ($)
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less $ 89
Due after one year through five years 477
Due after five years through ten years 394
Due after ten years 847
Total 1,807
Virginia Electric and Power Company  
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less 62
Due after one year through five years 244
Due after five years through ten years 239
Due after ten years 480
Total $ 1,025