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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
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] $ 25 $ 14 $ 21 $ 86
Amount of Gain (Loss) Reclassified From AOCI to Income (11) (16) (32) (44)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 268 182 236 815
Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] 25 18 21 77
Amount of Gain (Loss) Reclassified From AOCI to Income (1) (1) (1) (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 267 182 235 814
Interest Rate Contract        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 25 14 21 86
Amount of Gain (Loss) Reclassified From AOCI to Income [3] (11) (16) (32) (44)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] 268 182 236 815
Interest Rate Contract | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 25 18 21 77
Amount of Gain (Loss) Reclassified From AOCI to Income [3] (1) (1) (1) (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] $ 267 $ 182 $ 235 $ 814
[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 Statement of Income are classified in interest and related charges.