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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
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance at January 1, $ 86 $ 422 $ 222
Total realized and unrealized gains (losses):      
Included in earnings (6) 1 2
Included in earnings (172) (273) 444
Included in earnings $ 1 $ 0 $ 0
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
Included in regulatory assets/liabilities $ 297 $ (414) $ 183
Settlements 77 241 (455)
Purchases 112 104 28
Transfers out of Level 3 (7) 6 (2)
Balance at December 31, 384 86 422
Virginia Electric and Power Company      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance at January 1, (116) 221 102
Total realized and unrealized gains (losses):      
Included in earnings (176) (278) 382
Included in earnings $ 0 $ 0 $ 0
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
Included in regulatory assets/liabilities $ 202 $ (349) $ 102
Settlements 137 255 (393)
Purchases 21 35 28
Balance at December 31, 68 (116) 221
Discontinued Operations      
Total realized and unrealized gains (losses):      
Included in earnings $ (4) $ (1) $ 0