v3.26.1
Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
U.S. federal statutory income tax 21.00% 21.00%
State income taxes, net of federal income tax benefit 3.40% (0.70%)
Foreign tax effects 0.00% 0.70%
PTC tax credits (0.20%) (1.30%)
Amortization of ITC, including deferred taxes on basis differences tax credits (0.20%) (2.00%)
Other tax credits (0.20%) (2.00%)
Share-based payment awards (0.70%) (25.20%)
Excess officers compensation 0.10% 4.60%
Other 0.80% 0.90%
Qualified NDT fund income and losses 0.90% 18.60%
Effective income tax 24.90% 14.60%
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
U.S. federal statutory income tax $ 446 $ 32
State income taxes, net of federal income tax benefit 73 (1)
Foreign tax effects 0 1
PTC tax credits (4) (2)
Amortization of ITC, including deferred taxes on basis differences tax credits (5) (3)
Other tax credits (5) (3)
Share-based payment awards (14) (38)
Excess officers compensation 3 7
Other 17 1
Qualified NDT fund income and losses 19 28
Effective income tax $ 530 $ 22