Variable Interest Entities (Details) - USD ($) $ in Millions	May 31, 2018	Aug. 31, 2017
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities
Variable Interest Entity (PTI Xi'an), Nonconsolidated, Carrying Amount of Capital Leases	$ 72	$ 80
Variable Interest Entity (PTI Xi'an), Nonconsolidated, Carrying Amount of PP&E	$ 69	$ 76

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant