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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) (Details) - Commodity - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 139 $ 95
Total realized and unrealized gains (losses):    
Included in earnings (15) (7)
Included in other comprehensive income 0 3
Included in regulatory assets/liabilities (9) 17
Settlements 12 8
Transfers out of Level 3 3 (7)
Ending balance 130 109
Virginia Electric and Power Company    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 143 93
Total realized and unrealized gains (losses):    
Included in earnings (15) (8)
Included in regulatory assets/liabilities (8) 17
Settlements 12 8
Ending balance 132 110
Dominion Gas Holdings, LLC    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance (2) 6
Total realized and unrealized gains (losses):    
Included in other comprehensive income (1) 2
Transfers out of Level 3 3 (8)
Ending balance $ 0 $ 0