v3.25.2
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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 269 $ 190 $ 384 $ 86
Total realized and unrealized gains (losses):        
Operating Revenue (3) 2 10 (6)
Included in earnings $ 143 $ (27) $ 118 $ (148)
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 Electric fuel and other energy-related purchases Electric fuel and other energy-related purchases
Included in regulatory assets/liabilities $ 150 $ 176 $ 43 $ 307
Settlements (153) 18 (149) 94
Purchases 8 1 8 28
Ending balance 414 360 414 360
Virginia Electric and Power Company        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 26 (38) 68 (116)
Total realized and unrealized gains (losses):        
Included in earnings $ 143 $ (27) $ 116 $ (146)
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 Electric fuel and other energy-related purchases Electric fuel and other energy-related purchases
Included in regulatory assets/liabilities $ 145 $ 149 $ 113 $ 226
Settlements (143) 20 (126) 120
Purchases 8 1 8 21
Ending balance 179 105 179 105
Discontinued Operations        
Total realized and unrealized gains (losses):        
Included in earnings $ 0 $ 0 $ (0) $ (1)