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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, 2025
Sep. 30, 2024
Effective Income Tax Computation [Line Items]    
U.S. statutory rate 21.00% 21.00%
Increases (reductions) resulting from:    
State taxes, net of federal benefit 3.90% 3.20%
Investment tax credits (2.40%) (1.40%)
Production tax credits (4.70%) (3.20%)
Reversal of excess deferred income taxes (1.60%) (2.70%)
Qualified nuclear decommissioning trust net gains (losses) 2.50% 4.00%
Remeasurements and settlements of uncertain tax positions (1.00%)  
AFUDC - equity (0.70%) (0.70%)
Absence of tax on noncontrolling interest (1.20%)  
Other, net (0.10%) (0.30%)
Effective tax rate 15.70% 19.90%
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% 4.40%
Investment tax credits (0.80%) (0.80%)
Production tax credits (4.10%) (3.00%)
Reversal of excess deferred income taxes (1.70%) (1.80%)
Qualified nuclear decommissioning trust net gains (losses) 0.50% 0.60%
AFUDC - equity (1.00%) (0.60%)
Absence of tax on noncontrolling interest (1.80%)  
Other, net (0.10%) 0.30%
Effective tax rate 16.40% 20.10%