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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Related Party Transactions [Abstract]      
Net sales to related parties $ 185 $ 194 $ 217
Purchases from related parties 185 85 $ 66
Receivable from related parties 73 48  
Payable to related parties 45 $ 11  
Related Party Transaction [Line Items]      
Right-of-use Asset, Related Parties 11    
Lease Liability, Related Parties $ 10