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Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financial liabilities:    
Debt (excluding finance lease obligations), at carrying amount $ 8,461 $ 9,218
Level 2 [Member]    
Financial liabilities:    
Debt (excluding finance lease obligations), at fair value $ 8,300 $ 9,109