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Long-Term Debt - Revolving Credit Facility (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Amount outstanding under credit facility $ 12,901,000,000 $ 12,934,000,000
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Amount outstanding under credit facility 0  
Letters of credit issued against credit facility 2,000,000  
Remaining borrowing capacity 998,000,000  
Letter of credit sublimit as part of revolving credit facility $ 125,000,000