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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Related Party Transaction [Line Items]          
Revenue from related parties $ 46 $ 52 $ 143 $ 135  
Purchases from related parties 55 $ 25 121 $ 47  
Receivable from related parties 73   73   $ 48
Payable to related parties 33   33   $ 11
Right-of-use Asset, Related Parties 12   12    
Lease Liability, Related Parties $ 11   $ 11