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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Related Party Transaction [Line Items]      
Receivable from related parties $ 51   $ 48
Payable to related parties 14   $ 11
Revenue from related parties 44 $ 42  
Purchases from related parties $ 29 $ 12