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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 43 $ 53 $ (37) $ 64
Total realized and unrealized gains (losses):        
Included in regulatory assets/liabilities 80 18 160 25
Settlements 4 3 26 2
Purchases 0 0 0 (10)
Transfers out of Level 3 0 0 0 (2)
Ending balance 123 75 123 75
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 3 0 3
Virginia Electric and Power Company        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 43 59 (37) 60
Total realized and unrealized gains (losses):        
Included in regulatory assets/liabilities 80 18 160 26
Settlements 4 3 26 (2)
Ending balance 123 77 123 77
Operating Revenue        
Total realized and unrealized gains (losses):        
Included in earnings 0 3 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 2 0 2
Purchased Gas        
Total realized and unrealized gains (losses):        
Included in earnings 0 1 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 1 0 1
Electric Fuel and Other Energy-Related Purchases        
Total realized and unrealized gains (losses):        
Included in earnings (4) (3) (26) (7)
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company        
Total realized and unrealized gains (losses):        
Included in earnings $ (4) $ (3) $ (26) $ (7)