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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail)
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Effective Income Tax Computation [Line Items]    
U.S. statutory rate 21.00% 21.00%
Increases (reductions) resulting from:    
State taxes, net of federal benefit 3.30% 3.90%
Investment tax credits (1.20%) (1.50%)
Production tax credits (2.80%) (0.60%)
Reversal of excess deferred income taxes (2.40%) (2.60%)
Changes in state deferred taxes associated with assets held for sale 0.00% 1.30%
AFUDC - equity (0.60%) (0.10%)
Other, net (0.40%) (0.80%)
Effective tax rate 16.90% 20.60%
Virginia Electric and Power Company    
Effective Income Tax Computation [Line Items]    
U.S. statutory rate 21.00% 21.00%
Increases (reductions) resulting from:    
State taxes, net of federal benefit 4.40% 4.60%
Investment tax credits (0.80%) (0.70%)
Production tax credits (3.00%) (0.90%)
Reversal of excess deferred income taxes (1.80%) (2.60%)
Changes in state deferred taxes associated with assets held for sale 0.00% 0.00%
AFUDC - equity (0.60%) 0.00%
Other, net 0.30% (0.30%)
Effective tax rate 19.50% 21.10%