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Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] $ 17 $ (1) $ 89
Amount of Gain (Loss) Reclassified From AOCI to Income (43) (43) (57)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 189 5 855
Virginia Electric and Power Company      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] 17 (1) 80
Amount of Gain (Loss) Reclassified From AOCI to Income 0 (1) (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 188 4 854
Interest Rate      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 17 (1) 89
Amount of Gain (Loss) Reclassified From AOCI to Income [3] (43) (43) (57)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] 189 5 855
Interest Rate | Virginia Electric and Power Company      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 17 (1) 80
Amount of Gain (Loss) Reclassified From AOCI to Income [3] 0 (1) (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] $ 188 $ 4 $ 854
[1] Amounts deferred into AOCI have no associated effect in the Companies’ Consolidated Statements of Income.
[2] Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Companies’ Consolidated Statements of Income.
[3] Amounts recorded in the Companies’ Consolidated Statements of Income are classified in interest and related charges