v3.26.3
Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Effective Income Tax Computation [Line Items]        
U.S. federal statutory tax, Amount     $ 583  
Tax Jurisdiction of Domicile [Extensible Enumeration]     UNITED STATES  
State and local income taxes, net of federal income tax effect, Amount [1]     $ 89  
Production tax credits, Amount [2]     (154)  
Investment tax credit amortization, Amount     (71)  
Reversal of excess deferred income taxes, Amount     (56)  
AFUDC - equity, Amount     (26)  
Absence of tax on noncontrolling interest, Amount     (59)  
Qualified nuclear decommissioning trust net gains (losses), Amount     82  
Other, net, Amount     (3)  
Income tax expense (benefit) $ 215 [3] $ 216 [3] $ 385 [4],[5] $ 476 [4]
U.S. federal statutory tax, Percent     21.00% 21.00%
Increases (reductions) resulting from:        
State and local income taxes, net of federal income tax effect, Percent     3.20% [1] 3.90%
Production tax credits, Percent     (5.50%) [2] (4.70%) [6]
Investment tax credit amortization, Percent     (2.50%) (2.40%)
Reversal of excess deferred income taxes, Percent     (2.00%) (1.60%)
AFUDC - equity, Percent     (0.90%) (0.70%)
Absence of tax on noncontrolling interest, Percent     (2.10%) (1.20%)
Qualified nuclear decommissioning trust net gains (losses), Percent     3.00% 2.50%
Remeasurements and settlements of uncertain tax positions       (1.00%)
Other, net, Percent     (0.30%) (0.10%)
Effective tax rate, Percent     13.90% [5] 15.70%
Virginia Electric and Power Company        
Effective Income Tax Computation [Line Items]        
U.S. federal statutory tax, Amount     $ 606  
Tax Jurisdiction of Domicile [Extensible Enumeration]     UNITED STATES  
State and local income taxes, net of federal income tax effect, Amount [1]     $ 112  
Production tax credits, Amount [2]     (47)  
Investment tax credit amortization, Amount     (41)  
Reversal of excess deferred income taxes, Amount     (36)  
AFUDC - equity, Amount     (27)  
Absence of tax on noncontrolling interest, Amount     (59)  
Qualified nuclear decommissioning trust net gains (losses), Amount     12  
Other, net, Amount     (1)  
Income tax expense (benefit) $ 220 [7] $ 151 [7] $ 519 [5],[8] $ 356 [8]
U.S. federal statutory tax, Percent     21.00% 21.00%
Increases (reductions) resulting from:        
State and local income taxes, net of federal income tax effect, Percent     3.90% [1] 4.40%
Production tax credits, Percent     (1.60%) [2] (4.10%) [6]
Investment tax credit amortization, Percent     (1.40%) (0.80%)
Reversal of excess deferred income taxes, Percent     (1.30%) (1.70%)
AFUDC - equity, Percent     (0.90%) (1.00%)
Absence of tax on noncontrolling interest, Percent     (2.10%) (1.80%)
Qualified nuclear decommissioning trust net gains (losses), Percent     0.40% 0.50%
Remeasurements and settlements of uncertain tax positions       0.00%
Other, net, Percent     0.00% (0.10%)
Effective tax rate, Percent     18.00% [5] 16.40%
[1] State taxes in Virginia make up the majority (greater than 50%) of the tax effect in this category.
[2] Dominion Energy production tax credits include a $94 million income tax benefit for the clean energy fuel production tax credit.
[3] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[4] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[5] The Companies had no adjustments related to the following disclosure categories: foreign tax effects, effects of changes in tax law or rates enacted in the current period and effects of cross-border tax laws.
[6] Dominion Energy and Virginia Power production tax credits include a $66 million income tax benefit for the nuclear production tax credit. Dominion Energy production tax credits also include a $50 million income tax benefit for the clean fuel production tax credit.
[7] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.
[8] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.