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Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
SNF Obligation $ 1,349 $ 1,296
Carrying Amount    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-Term Debt, including amounts due within one year 8,412 7,617
SNF Obligation 1,349 1,296
Fair Value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-Term Debt, including amounts due within one year 8,942 7,914
SNF Obligation 1,310 1,222
Fair Value | Level 2    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-Term Debt, including amounts due within one year 8,205 7,140
SNF Obligation 1,310 1,222
Fair Value | Level 3    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-Term Debt, including amounts due within one year 737 774
SNF Obligation $ 0 $ 0