v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] $ 75 $ (5) $ 87 $ (26)
Amount of Gain (Loss) Reclassified From AOCI to Income (8) (10) (25) (30)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 507 (29) 495 (101)
Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1] 42 (2) 40 (9)
Amount of Gain (Loss) Reclassified From AOCI to Income 0 0 1 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 507 (29) 494 (102)
Interest Rate        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 75 (5) 87 (26)
Amount of Gain (Loss) Reclassified From AOCI to Income [3] (8) (10) (25) (30)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] 507 (29) 495 (101)
Interest Rate | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivatives [1],[3] 42 (2) 40 (9)
Amount of Gain (Loss) Reclassified From AOCI to Income [3] 0 0 1 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] $ 507 $ (29) $ 494 $ (102)
[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.