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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less $ 26
Due after one year through five years 517
Due after five years through ten years 532
Due after ten years 1,233
Total 2,308
Virginia Electric and Power Company  
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less 8
Due after one year through five years 255
Due after five years through ten years 276
Due after ten years 833
Total $ 1,372