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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions [Abstract]      
Net sales to related parties $ 958 $ 1,004 $ 928
Purchases from related parties 203 195 $ 184
Receivable from related parties 103 131  
Payable to related parties $ 75 $ 50