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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Related Party Transaction [Line Items]      
Receivable from related parties $ 122   $ 108
Payable to related parties 34   $ 50
Revenue from related parties 242 $ 225  
Purchases from related parties $ 41 $ 49