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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Related Party Transaction [Line Items]          
Receivable from related parties $ 99   $ 99   $ 66
Payable to related parties 22   22   $ 11
Revenue from related parties 272 $ 277 726 $ 747  
Purchases from related parties $ 64 $ 48 $ 165 $ 131