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Fair Values of Financial Instruments (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current maturities $ (17,199) $ (17,179)
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current maturities $ (16,654) $ (16,631)