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Financial Instruments and Fair Value Measurements - Transfer of Financial Assets Accounted for as Sales (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Fair Value Disclosures [Abstract]      
Trade receivables transferred to third parties under factoring arrangements $ 1,560 $ 1,385 $ 2,615
Amounts yet to be collected and remitted to the third parties $ 389 $ 254