v3.26.1
Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Effective Income Tax Computation [Line Items]        
U.S. federal statutory tax, Amount     $ 270  
State and local income taxes, net of federal income tax effect, Amount [1]     53  
Production tax credits, Amount [2]     (91)  
Investment tax credit amortization, Amount     (44)  
Reversal of excess deferred income taxes, Amount     (33)  
AFUDC - equity, Amount     (15)  
Absence of tax on noncontrolling interest, Amount     (29)  
Qualified nuclear decommissioning trust net gains (losses), Amount     61  
Other, net, Amount     (2)  
Income tax expense (benefit) $ 122 [3] $ 220 [3] $ 170 [4],[5] $ 260 [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     4.10% [1] 4.70%
Production tax credits, Percent     (7.10%) [2] (4.90%) [6]
Investment tax credit amortization, Percent     (3.40%) (2.50%)
Reversal of excess deferred income taxes, Percent     (2.60%) (1.70%)
AFUDC - equity, Percent     (1.20%) (0.80%)
Absence of tax on noncontrolling interest, Percent     (2.10%) (1.60%)
Qualified nuclear decommissioning trust net gains (losses), Percent     4.80% 2.00%
Remeasurements and settlements of uncertain tax positions       (1.60%)
Other, net, Percent     (0.30%) (0.10%)
Effective tax rate, Percent     13.20% [5] 14.50%
Virginia Electric and Power Company        
Effective Income Tax Computation [Line Items]        
U.S. federal statutory tax, Amount     $ 351  
State and local income taxes, net of federal income tax effect, Amount [1]     66  
Production tax credits, Amount [2]     (34)  
Investment tax credit amortization, Amount     (23)  
Reversal of excess deferred income taxes, Amount     (23)  
AFUDC - equity, Amount     (16)  
Absence of tax on noncontrolling interest, Amount     (29)  
Qualified nuclear decommissioning trust net gains (losses), Amount     10  
Other, net, Amount     (3)  
Income tax expense (benefit) $ 154 [7] $ 115 [7] $ 299 [5],[8] $ 205 [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     4.00% [1] 4.40%
Production tax credits, Percent     (2.00%) [2] (4.10%) [6]
Investment tax credit amortization, Percent     (1.40%) (0.80%)
Reversal of excess deferred income taxes, Percent     (1.40%) (1.70%)
AFUDC - equity, Percent     (1.00%) (1.00%)
Absence of tax on noncontrolling interest, Percent     (1.80%) (2.30%)
Qualified nuclear decommissioning trust net gains (losses), Percent     0.60% (0.00%)
Remeasurements and settlements of uncertain tax positions       0.00%
Other, net, Percent     (0.10%) (0.10%)
Effective tax rate, Percent     17.90% [5] 15.40%
[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 $50 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 $40 million income tax benefit for the nuclear production tax credit. Dominion Energy production tax credits also include a $27 million income tax benefit for the clean fuel production tax credit.

During the second quarter of 2026, Dominion Energy determined that it is expected to be subject to the corporate alternative minimum tax in 2026 and recorded a corporate alternative minimum tax liability of $21 million, net of tax credit utilization, along with corresponding deferred tax assets related to corporate alternative minimum tax credit carryforwards, which management expects to fully utilize in future periods. The ultimate impact of the corporate alternative minimum tax remains subject to pending guidance and interpretations, which could materially impact the Companies’ results of operations, financial condition and/or cash flows.

During the second quarter of 2026, Dominion Energy entered into an agreement with a third party and completed the transfer of tax credits generated in 2025 for which it received cash proceeds of $45 million. In July 2026, Dominion Energy entered into a separate agreement with a third party and completed the transfer of tax credits generated in 2025 for which it received cash proceeds of $21 million.

[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.