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Investments (Fair Value of Fixed Income Securities by Contractual Maturity) (Detail)
$ in Millions
Mar. 31, 2025
USD ($)
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less $ 29
Due after one year through five years 590
Due after five years through ten years 382
Due after ten years 1,268
Total 2,269
Virginia Electric and Power Company  
Schedule of Held-to-maturity Securities [Line Items]  
Due in one year or less 19
Due after one year through five years 314
Due after five years through ten years 172
Due after ten years 847
Total $ 1,352