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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Related Party Transaction [Line Items]          
Revenue from related parties $ 48 $ 53 $ 83 $ 97  
Purchases from related parties 47 $ 37 91 $ 66  
Receivable from related parties 63   63   $ 73
Payable to related parties 27   27   45
Right-of-use Asset, Related Parties 10   10   11
Lease Liability, Related Parties $ 10   $ 10   $ 10