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Financial Instruments and Fair Value Measurements - Transfer of Financial Assets Accounted for as Sales (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Fair Value Disclosures [Abstract]          
Trade receivables transferred to third parties under factoring arrangements $ 369 $ 361 $ 728 $ 740  
Amounts yet to be collected and remitted to the third parties $ 345   $ 345   $ 254