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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Related Party Transaction [Line Items]          
Receivable from related parties $ 37   $ 37   $ 34
Payable to related parties 4   4   $ 6
Revenue from related parties 38 $ 54 83 $ 97  
Purchases from related parties $ 10 $ 16 $ 22 $ 30