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Debt - Credit Facility (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Credit Facility $ 0 $ 0
Commercial Paper (70,000,000)  
Credit Facility    
Line of Credit Facility [Line Items]    
Available borrowing capacity 2,250,000,000 2,250,000,000
Commercial Paper (70,000,000) 0
Letters of Credit Outstanding, Amount (1,914,000) (1,914,000)
Amount available under commercial paper program and letters of credit 2,178,086,000 2,248,086,000
Other Letter of Credit    
Line of Credit Facility [Line Items]    
Letters of Credit Outstanding, Amount $ (50,418,000) $ (48,740,000)