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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Related Party Transaction [Line Items]          
Receivable from related parties $ 55   $ 55   $ 36
Payable to related parties 8   8   $ 18
Revenue from related parties 65 $ 65 162 $ 169  
Purchases from related parties $ 27 $ 19 $ 57 $ 43