Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Corporate Joint Venture
Related Party Transaction [Line Items]
Purchases from joint ventures	$ 5	$ 3	$ 11	$ 9

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration