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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance at January 1, $ 422 $ 222 $ 103
Total realized and unrealized gains (losses):      
Included in earnings 1 2 (9)
Included in earnings $ (273) $ 444 $ 10
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 $ (414) $ 183 $ 119
Settlements 241 (455) (10)
Purchases 104 28 0
Transfers out of Level 3 6 (2) 9
Balance at December 31, 86 422 222
Virginia Electric and Power Company      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance at January 1, 221 102 103
Total realized and unrealized gains (losses):      
Included in earnings $ (278) $ 382 $ 4
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 $ (349) $ 102 $ (1)
Settlements 255 (393) (4)
Purchases 35 28 0
Balance at December 31, (116) 221 102
Discontinued Operations      
Total realized and unrealized gains (losses):      
Included in earnings $ (1) $ 0 $ 0