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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
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 123 $ 75 $ (37) $ 64
Total realized and unrealized gains (losses):        
Included in regulatory assets/liabilities 4 (76) 164 (51)
Settlements 0 5 26 7
Purchases 0 0 0 (10)
Transfers out of Level 3 0 0 0 (2)
Ending balance 127 (1) 127 (1)
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date 0 0 0 3
Virginia Electric and Power Company        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 123 77 (37) 60
Total realized and unrealized gains (losses):        
Included in regulatory assets/liabilities 4 (76) 164 (50)
Settlements 0 5 26 3
Ending balance 127 1 127 1
Operating Revenue        
Total realized and unrealized gains (losses):        
Included in earnings 0 0 0 2
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date 0 0 0 2
Purchased Gas        
Total realized and unrealized gains (losses):        
Included in earnings 0 0 0 1
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date 0 0 0 1
Electric Fuel and Other Energy-Related Purchases        
Total realized and unrealized gains (losses):        
Included in earnings 0 (5) (26) (12)
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company        
Total realized and unrealized gains (losses):        
Included in earnings $ 0 $ (5) $ (26) $ (12)