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Fair Value Measurements (Net Change in the Assets and Liabilities Measured at Fair Value on a Recurring Basis and Included in the Level 3 Fair Value Category) (Detail) - Commodity - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 86 $ 422
Total realized and unrealized gains (losses):    
Included in earnings (121) $ (51)
Operating Revenue $ (8)  
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Electric fuel and other energy-related purchases Electric fuel and other energy-related purchases
Included in regulatory assets/liabilities $ 131 $ (216)
Settlements 76 35
Purchases 27 16
Ending balance 190 206
Virginia Electric and Power Company    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance (116) 221
Total realized and unrealized gains (losses):    
Included in earnings (119) (52)
Included in regulatory assets/liabilities 77 (166)
Settlements 100 36
Purchases 20 16
Ending balance (38) $ 55
Discontinued operations    
Total realized and unrealized gains (losses):    
Included in earnings $ (1)