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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Tax Credit Carryforward [Line Items]        
Effective tax rate 14.70% 12.50% 21.40% 19.40%
Income tax rate benefit from tax credits $ 65 $ 81 $ 65 $ 122
Income tax benefit from renewable energy tax credits 8   18  
Additional federal and state benefits 9 $ 6 9 6
Cash paid (refunded) for income taxes     166 $ 183
Liability for penalties 1   1  
Liability for interest related to uncertain tax positions 5   5  
State Loss Carryforwards        
Tax Credit Carryforward [Line Items]        
Deferred tax assets, valuation allowance $ 40   $ 40