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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Related Party Transactions [Abstract]      
Net sales to related parties $ 217 $ 220 $ 226
Purchases from related parties 66 63 $ 61
Receivable from related parties 34 36  
Payable to related parties $ 6 $ 18