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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Related Party Transactions [Abstract]      
Net sales to related parties $ 347 $ 386 $ 389
Purchases from related parties 566 704 $ 614
Accounts receivable due from related parties 49 73  
Accounts payable due to related parties $ 105 $ 137