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Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
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(a) (0.70%) (6.20%)
Foreign Tax Effects 0.70% 0.10%
PTC (1.30%) (6.10%)
Amortization of ITC, including deferred taxes on basis differences (2.00%) (0.30%)
Other (2.00%) (0.60%)
Share-based payment awards (25.20%) (1.50%)
Excess officers compensation 4.60% 0.40%
Other 0.90% 0.00%
Qualified NDT fund income and losses 18.60% 8.90%
Effective income tax 14.60% 15.70%
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
U.S. federal statutory income tax $ 32 $ 220
State income taxes, net of federal income tax benefit (1) (64)
Foreign Tax Effects 1 1
PTC (2) (64)
Amortization of ITC, including deferred taxes on basis differences (3) (3)
Other (3) (6)
Share-based payment awards (38) (16)
Excess officers compensation 7 4
Other 1 0
Qualified NDT fund income and losses 28 93
Income tax (benefit) expense $ 22 $ 165