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Equity (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Electric fuel and other energy related purchases $ (2,814) $ (2,301) $ (2,333)
Purchased gas (645) (701) (459)
Interest and related charges (1,493) (1,205) (1,010)
Other income [1] 1,021 358 429
Income from operations before income tax expense 3,129 3,090 2,867
Income tax expense (580) 30 (655)
Virginia Electric and Power Company      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Electric fuel and other energy related purchases [2] (2,318) (1,909) (1,973)
Interest and related charges [2] (511) (494) (461)
Other income 22 76 56
Income from operations before income tax expense 1,582 2,314 1,945
Income tax expense (300) (774) (727)
Dominion Energy Gas Holdings, LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Purchased gas [3] (40) (132) (109)
Interest and related charges [3] (105) (97) (94)
Other income 133 104 87
Income from operations before income tax expense 387 666 607
Income tax expense (86) (51) $ (215)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Income from operations before income tax expense 137 (47)  
Income tax expense (35) 18  
Income from continuing operations including noncontrolling interests 102 (29)  
Deferred (gains) and losses on derivatives-hedging activities: | Commodity | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Operating revenue 90 (81)  
Electric fuel and other energy related purchases (14)    
Purchased gas   2  
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest and related charges 48 52  
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other income 13 (20)  
Deferred (gains) and losses on derivatives-hedging activities: | Virginia Electric and Power Company | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Income from operations before income tax expense 1 1  
Income from continuing operations including noncontrolling interests 1 1  
Deferred (gains) and losses on derivatives-hedging activities: | Virginia Electric and Power Company | Interest rate | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest and related charges 1 1  
Deferred (gains) and losses on derivatives-hedging activities: | Dominion Energy Gas Holdings, LLC | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Income from operations before income tax expense 27 (7)  
Income tax expense (7) 3  
Income from continuing operations including noncontrolling interests 20 (4)  
Deferred (gains) and losses on derivatives-hedging activities: | Dominion Energy Gas Holdings, LLC | Commodity | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Operating revenue 8 8  
Deferred (gains) and losses on derivatives-hedging activities: | Dominion Energy Gas Holdings, LLC | Interest rate | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Interest and related charges 6 5  
Deferred (gains) and losses on derivatives-hedging activities: | Dominion Energy Gas Holdings, LLC | Foreign currency | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other income 13 (20)  
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Realized (gain) loss on sale of securities 7 (81)  
Impairment   23  
Income from operations before income tax expense 7 (58)  
Income tax expense (2) 21  
Income from continuing operations including noncontrolling interests 5 (37)  
Unrealized (gains) and losses on investment securities: | Virginia Electric and Power Company | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Realized (gain) loss on sale of securities   (9)  
Impairment   2  
Income from operations before income tax expense   (7)  
Income tax expense   3  
Income from continuing operations including noncontrolling interests   (4)  
Unrecognized pension and other postretirement benefit costs: | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other income (21) (21)  
Other income 120 103  
Unrecognized pension and other postretirement benefit costs, before tax 99 82  
Unrecognized pension and other postretirement benefit costs, income tax expense (21) (32)  
Unrecognized pension and other postretirement benefit costs, net of tax 78 50  
Unrecognized pension and other postretirement benefit costs: | Dominion Energy Gas Holdings, LLC | Amounts Reclassified From AOCI      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other income 6 6  
Unrecognized pension and other postretirement benefit costs, before tax 6 6  
Unrecognized pension and other postretirement benefit costs, income tax expense (2) (2)  
Unrecognized pension and other postretirement benefit costs, net of tax $ 4 $ 4  
[1] See Note 9 for amounts attributable to related parties.
[2] See Note 24 for amounts attributable to affiliates.
[3] See Note 24 for amounts attributable to related parties.