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Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ 12,664    
Other comprehensive income (loss) (325) $ (58) $ (92)
Ending balance 14,605 12,664  
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (474) (416)  
Other comprehensive income before reclassifications: gains (losses) (172) 49  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [1] (153) (107)  
Other comprehensive income (loss) (325) (58) (92)
Ending balance (799) (474) (416)
Deferred gains and losses on derivatives-hedging activities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (176) (178)  
Other comprehensive income before reclassifications: gains (losses) 55 110  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [1] (159) (108)  
Other comprehensive income (loss) (104) 2  
Ending balance (280) (176) (178)
Unrealized gains and losses on investment securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 504 548  
Other comprehensive income before reclassifications: gains (losses) 93 6  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [1] (28) (50)  
Other comprehensive income (loss) 65 (44)  
Ending balance 569 504 548
Unrecognized pension and other postretirement benefit costs      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (797) (782)  
Other comprehensive income before reclassifications: gains (losses) (319) (66)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [1] 34 51  
Other comprehensive income (loss) (285) (15)  
Ending balance (1,082) (797) (782)
Other comprehensive loss from equity method investees      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (5) (4)  
Other comprehensive income before reclassifications: gains (losses) (1) (1)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [1] 0 0  
Other comprehensive income (loss) (1) (1)  
Ending balance (6) (5) (4)
Virginia Electric and Power Company      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 10,641    
Other comprehensive income (loss) 6 (10) 2
Ending balance 11,865 10,641  
Virginia Electric and Power Company | Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 40 50  
Other comprehensive income before reclassifications: gains (losses) 9 (5)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [2] (3) (5)  
Other comprehensive income (loss) 6 (10) 2
Ending balance 46 40 50
Virginia Electric and Power Company | Deferred gains and losses on derivatives-hedging activities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (7) (7)  
Other comprehensive income before reclassifications: gains (losses) (2) (1)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [2] 1 1  
Other comprehensive income (loss) (1) 0  
Ending balance (8) (7) (7)
Virginia Electric and Power Company | Unrealized gains and losses on investment securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 47 57  
Other comprehensive income before reclassifications: gains (losses) 11 (4)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [2] (4) (6)  
Other comprehensive income (loss) 7 (10)  
Ending balance 54 47 57
Dominion Gas Holdings, LLC      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 3,318    
Other comprehensive income (loss) (24) (13) (28)
Ending balance 3,536 3,318  
Dominion Gas Holdings, LLC | Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (99) (86)  
Other comprehensive income before reclassifications: gains (losses) (36) (14)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [3] 12 1  
Other comprehensive income (loss) (24) (13) (28)
Ending balance (123) (99) (86)
Dominion Gas Holdings, LLC | Deferred gains and losses on derivatives-hedging activities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (17) (20)  
Other comprehensive income before reclassifications: gains (losses) (16) 6  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [3] 9 (3)  
Other comprehensive income (loss) (7) 3  
Ending balance (24) (17) (20)
Dominion Gas Holdings, LLC | Unrecognized pension and other postretirement benefit costs      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (82) (66)  
Other comprehensive income before reclassifications: gains (losses) (20) (20)  
Amounts reclassified from accumulated other comprehensive income: (gains) losses [3] 3 4  
Other comprehensive income (loss) (17) (16)  
Ending balance $ (99) $ (82) $ (66)
[1] See table below for details about these reclassifications.
[2] See table below for details about these reclassifications.
[3] See table below for details about these reclassifications.