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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating revenue [1] $ (3,585) $ (3,970) $ (8,081) $ (7,828)
Interest and related charges 449 452 939 921
Other income (502) (53) (50) (400)
Income tax expense (benefit) (556) 43 (575) 157
Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating revenue [2] (1,805) (1,938) (3,735) (3,903)
Interest and related charges [2] 137 135 263 270
Other income (52) (16) 0 (53)
Income from operations before income tax expense (550) (119) (239) (143)
Income tax expense (benefit) 60 19 29 23
Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating revenue [3] (510) (530) (1,066) (1,096)
Interest and related charges [3] 50 86 108 173
Other income [3] (46) (44) (95) (85)
Income tax expense (benefit) (82) 23 (30) 66
Income (loss) including noncontrolling interests, net of tax 166 (123) (36) (295)
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 7 (29) 36 (70)
Income tax expense (benefit) (2) 8 (9) 18
Income (loss) including noncontrolling interests, net of tax 5 (21) 27 (52)
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income from operations before income tax expense (2) (2) 6 1
Income tax expense (benefit) 0 0 (2) 0
Income (loss) including noncontrolling interests, net of tax (2) (2) 4 1
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating revenue (9) (38) (16) (92)
Purchased gas     3 (3)
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Commodity contracts | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating revenue       (2)
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges 22 13 49 23
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges 4 2 6 1
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign currency        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (6) (4)   2
Deferred (Gains) and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Foreign currency | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (6) (4)   2
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Realized (gains) losses on sale of securities (5) (1) (18) (1)
Income from operations before income tax expense (5) (1) (18) (1)
Income tax expense (benefit) 0 0 4 0
Income (loss) including noncontrolling interests, net of tax (5) (1) (14) (1)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Realized (gains) losses on sale of securities (4)   (2)  
Income from operations before income tax expense (4)   (2)  
Income tax expense (benefit) 2   1  
Income (loss) including noncontrolling interests, net of tax (2)   (1)  
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income (5) (8) (11) (13)
Amortization of actuarial losses | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension and other postretirement benefit costs, before tax 2 2 4 4
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) 0 0 (1) (1)
Unrecognized pension and other postretirement benefit costs, net of tax 2 2 3 3
Amortization of actuarial losses | Amounts Reclassified From AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income 31 27 61 54
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other income 2 2 4 4
Unrecognized pension and other postretirement benefit costs        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension and other postretirement benefit costs, before tax 26 19 50 41
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) (8) 3 (13) (11)
Unrecognized pension and other postretirement benefit costs, net of tax 18 22 37 30
Deferred Gains and Losses on Derivatives-Hedging Activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension and other postretirement benefit costs, net of tax [4] 5 (21) 27 (52)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension and other postretirement benefit costs, net of tax [5] 0 1 0 1
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrecognized pension and other postretirement benefit costs, net of tax (2) [4] $ (2) [4] 4 [6] $ 1 [6]
Deferred Gains and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income from operations before income tax expense 1   1  
Income tax expense (benefit) (1)   (1)  
Income (loss) including noncontrolling interests, net of tax 0   0  
Deferred Gains and Losses on Derivatives-Hedging Activities | Amounts Reclassified From AOCI | Interest rate contracts | Virginia Electric and Power Company        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and related charges $ 1   $ 1  
[1] See Note 10 for amounts attributable to related parties.
[2] See Note 19 for amounts attributable to affiliates.
[3] See Note 19 for amounts attributable to related parties.
[4] See table below for details about these reclassifications.
[5] See table below for details about these reclassifications. Virginia Power’s reclassifications out of AOCI were immaterial for both the three and six months ended June 30, 2019
[6] See table below for details about these reclassifications