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Employee Benefit Plans (AOCI and regulatory assets and liabilities that have not been recognized as components of periodic benefit (credit) cost) (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total [1] $ 3,332 $ 3,484
Amount included in AOCI 2,000 2,000
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total [1] (98) (43)
Amount included in AOCI (65) (41)
Dominion Energy Gas Holdings, LLC | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total [2] 150 555
Amount included in AOCI 147 200
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total [2] $ (5) 37
Dominion Energy Gas Holdings, LLC | Noncurrent Assets of Discontinued Operations    
Defined Benefit Plan Disclosure [Line Items]    
Total   $ 22
[1] As of December 31, 2019, of the $3.3 billion and $(98) million related to pension benefits and other postretirement benefits, $2.0 billion and $(65) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities. As of December 31, 2018, of the $3.5 billion and $(43) million related to pension benefits and other postretirement benefits, $2.0 billion and $(41) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities.
[2] As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities. As of December 31, 2018, of the $555 million related to pension benefits, $200 million is included in AOCI, with the remainder included in regulatory assets and liabilities; the $37 million related to other postretirement benefits is included entirely in regulatory assets and liabilities.