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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Fair Value Disclosures [Abstract]          
Trade receivables transferred to third parties under factoring arrangements $ 323 $ 364 $ 478 $ 856  
Amounts yet to be collected and remitted to the third parties $ 237   $ 237   $ 130