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Operating Segments (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]            
After-tax charge related to the impairment of gathering and processing assets     $ 164      
Gain loss on investments held in nuclear decommissioning trust funds, after tax       $ (93) $ (17) $ 141
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act [1]         46 (851)
Charges associated with equity method investments in wind-powered generation facilities           158
Charge related to a voluntary retirement program       320    
Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds, after tax       (17) 2 16
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act [1]       0 21 (93)
Charge related to a voluntary retirement program       116    
Dominion Energy Gas Holdings, LLC            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds, after tax       (18) (45) 26
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act [1]         (6) (246)
Transaction and transition costs related to acquisition       603 230 239
Charge related to a voluntary retirement program       20    
Virginia Legislation | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Benefit from revision of future closure costs       113    
Benefit from revision of future closure costs, after tax       84    
Corporate and Other            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)       (627)    
Dominion Energy Virginia | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Asset early retirement expense       160    
Asset early retirement expense after tax       119    
Contract termination with a non-utility generator       135    
Contract termination with a non-utility generator, after tax       100    
Abandonment expense       62    
Abandonment expense, after tax       46    
Dominion Energy Virginia | Virginia Legislation | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Benefit from revision of future closure costs       113    
Benefit from revision of future closure costs, after tax       84    
Dominion Energy South Carolina Inc            
Segment Reporting Information [Line Items]            
Charge for refund of amounts from customers, after tax       756    
Charge for refund of amounts from customers       1,000    
Remeasured Subsequent To Initial Recognition            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       1,000    
SCANA            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds       150    
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       194    
Transaction and transition costs related to acquisition   $ 1,300   484    
Transaction and transition costs related to acquisition, after tax       315    
Income tax related to regulatory assets acquired       258    
Charge related to a voluntary retirement program       444    
Charge related to a voluntary retirement program, after-tax       332    
Charge related to a voluntary retirement program after tax $ 316          
SCANA | Dominion Energy Virginia            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax       151    
SCANA | Gas, Transmission & Storage            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax       5    
SCANA | Contracted Generation            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax       38    
SCANA | Dominion Energy South Carolina Inc            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       194    
Transaction and transition costs related to acquisition       641    
Transaction and transition costs related to acquisition, after tax       480    
Income tax related to regulatory assets acquired   $ 258        
Charge related to a voluntary retirement program, after-tax       75    
Charge for property, plant and equipment acquired but committed to forgo recovery       114    
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax       86    
SCANA | Gas Distribution            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax       56    
Operating Segments            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds       553 170  
Gain loss on investments held in nuclear decommissioning trust funds, after tax       411 134  
After- tax net benefit (expenses)       (2,000) (88) 861
Benefit associated with sale of certain merchant generation facilities and equity method investments         828  
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax         619  
Operating Segments | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act           93
Charge related to a voluntary retirement program       198    
Charge related to a voluntary retirement program, after-tax       146    
Operating Segments | Dominion Energy Gas Holdings, LLC            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)         (107) (156)
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act           169
Charge for disallowance of FERC-regulated plant         124  
After-tax charge for disallowance of FERC-regulated plant         88  
Charge for disallowance of FERC-regulated plant         124  
Operating Segments | Virginia Regulation            
Segment Reporting Information [Line Items]            
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities         81  
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax         60  
Operating Segments | Corporate and Other            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)       (2,600) (611) 377
Operating Segments | Corporate and Other | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)       (634) (312) 74
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)       127 (90) $ 389
Tax benefit resulting from changes in tax status ofsubsidiaries       48    
Charge related to a voluntary retirement program       42    
Charge related to a voluntary retirement program after tax       31    
Operating Segments | Gas Infrastructure            
Segment Reporting Information [Line Items]            
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax         390  
Operating Segments | Dominion Energy Virginia            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds, after tax       49 14  
Operating Segments | Dominion Energy Virginia | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Asset early retirement expense       346    
Asset early retirement expense after tax       257    
Operating Segments | Dominion Energy Virginia | Dominion Energy Gas Holdings, LLC            
Segment Reporting Information [Line Items]            
After- tax net benefit (expenses)       12    
Asset early retirement expense       346    
Asset early retirement expense after tax       257    
Operating Segments | Dominion Energy Virginia | Virginia Legislation            
Segment Reporting Information [Line Items]            
One-time rate credit amount         215  
One-time rate credit amount after tax         160  
Operating Segments | Power Delivery            
Segment Reporting Information [Line Items]            
Charge associated with major storm damage and service restoration         70  
Charge associated with major storm damage and service restoration, after tax         52  
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax         229  
Operating Segments | Gas, Transmission & Storage            
Segment Reporting Information [Line Items]            
After-tax charge related to the impairment of gathering and processing assets         164  
Charge related to impairment of certain gathering and processing assets         219  
Operating Segments | Contracted Generation            
Segment Reporting Information [Line Items]            
Gain loss on investments held in nuclear decommissioning trust funds, after tax       362 $ 120  
Charges associated with equity method investments in wind-powered generation facilities       158    
Charges associated with equity method investments in wind-powered generation facilities, after tax       96    
Operating Segments | Remeasured Subsequent To Initial Recognition | Dominion Energy Virginia            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       83    
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas, Transmission & Storage            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       302    
Operating Segments | Remeasured Subsequent To Initial Recognition | Contracted Generation            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       569    
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas Distribution            
Segment Reporting Information [Line Items]            
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act       $ 56    
[1] The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.