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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Computation [Line Items]      
U.S. statutory rate 21.00% 21.00% 35.00%
Increases (reductions) resulting from:      
State taxes, net of federal benefit 1.30% 3.00% 2.00%
Investment tax credits (5.70%) (1.90%) (6.30%)
Production tax credits (1.10%) (0.70%) (0.70%)
Valuation allowances 0.10% 0.30% 0.20%
Reversal of excess deferred income taxes (2.00%) (2.00%) 0.00%
Federal legislative change 0.00% 1.50% (27.50%)
State legislative change 0.00% (0.60%) 0.00%
Write-off of regulatory assets 10.90% 0.00% 0.00%
Change in tax status (2.80%) 0.00% 0.00%
AFUDC-equity (1.80%) (0.80%) (1.40%)
Employee stock ownership plan deduction (0.70%) (0.40%) (0.60%)
Other, net 1.10% (0.90%) (1.70%)
Effective tax rate 20.30% 18.50% (1.00%)
Virginia Electric and Power Company      
Effective Income Tax Computation [Line Items]      
U.S. statutory rate 21.00% 21.00% 35.00%
Increases (reductions) resulting from:      
State taxes, net of federal benefit 4.50% 4.70% 3.70%
Investment tax credits (2.90%) (3.50%) (0.80%)
Production tax credits (0.70%) (0.70%) (0.40%)
Valuation allowances 0.00% 0.00% 0.00%
Reversal of excess deferred income taxes (3.10%) (3.20%) 0.00%
Federal legislative change 0.00% 1.30% (4.00%)
State legislative change 0.00% 0.00% 0.00%
Write-off of regulatory assets 0.00% 0.00% 0.00%
Change in tax status 0.00% 0.00% 0.00%
AFUDC-equity 0.00% (0.50%) (0.60%)
Employee stock ownership plan deduction 0.00% 0.00% 0.00%
Other, net (0.20%) (0.10%) 0.60%
Effective tax rate 18.60% 19.00% 33.50%
Dominion Energy Gas Holdings, LLC      
Effective Income Tax Computation [Line Items]      
U.S. statutory rate 21.00% 21.00% 35.00%
Increases (reductions) resulting from:      
State taxes, net of federal benefit 2.50% 3.20% 2.60%
Investment tax credits 0.00% 0.00% 0.00%
Production tax credits 0.00% 0.00% 0.00%
Valuation allowances (0.20%) 0.00% 0.30%
Reversal of excess deferred income taxes (0.80%) (0.60%) 0.00%
Federal legislative change 0.00% (0.50%) (41.00%)
State legislative change 0.00% (2.00%)  
Write-off of regulatory assets 0.00% 0.00% 0.00%
Change in tax status (6.00%) 0.00% 0.00%
AFUDC-equity (0.50%) (0.30%) (0.90%)
Employee stock ownership plan deduction 0.00% 0.00% 0.00%
Other, net [1] (3.40%) (4.40%) (6.00%)
Effective tax rate 12.60% 16.40% (10.70%)
[1] Includes (3.2)%, (4.6)% and (6.7)% relating to the absence of tax on noncontrolling interest in 2019, 2018 and 2017, respectively.