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Letters of Credit (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Line of Credit Facility [Abstract]    
Amount outstanding at period end $ 820 $ 695
Line of Credit Facility [Line Items]    
Amount outstanding at period end 820 695
Letter of Credit    
Line of Credit Facility [Abstract]    
Amount outstanding at period end $ 42 42
Debt Instrument, Term 1 year  
Line of Credit Facility [Line Items]    
Amount outstanding at period end $ 42 $ 42
Debt Instrument, Term 1 year