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 |