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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 $ 194 $ 217 $ 220
Purchases from related parties 85 66 63
Receivable from related parties 48 34  
Payable to related parties 11 6  
Related Party Transaction [Line Items]      
Net sales to related parties 194 217 220
Purchases from related parties $ 85 $ 66 $ 63