Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Supplemental information - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	May 31, 2021	Aug. 31, 2020	May 31, 2020	Aug. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,345	$ 469
Cash, cash equivalents and restricted cash	1,803	746	$ 943	$ 1,207
Continuing Operations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,345	469
Restricted cash	76	62
Discontinued Operations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	239	47
Restricted cash	$ 143	$ 168