v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] $ 16 $ (0) $ 12 $ (21)
Amount of Gain (Loss) Reclassified From AOCI to Income (9) (10) (17) (20)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 24 28 (12) (72)
Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] 1 2 (2) (7)
Amount of Gain (Loss) Reclassified From AOCI to Income 0 0 1 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 23 28 (13) (73)
Interest Rate        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 16 (0) 12 (21)
Amount of Gain (Loss) Reclassified From AOCI to Income [3] (9) (10) (17) (20)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] 24 28 (12) (72)
Interest Rate | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 1 2 (2) (7)
Amount of Gain (Loss) Reclassified From AOCI to Income [3] 0 0 1 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] $ 23 $ 28 $ (13) $ (73)
[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.