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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Corporate Joint Venture        
Related Party Transaction [Line Items]        
Purchases from joint ventures $ 5 $ 5 $ 12 $ 11