Related parties (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020	Aug. 31, 2020
Related Party Transactions [Abstract]
Purchases, net	$ 15,947	$ 15,081	$ 46,449	$ 44,489
Trade accounts payable, net	$ 6,608		$ 6,608		$ 6,390

Amount for accounts payable to related parties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant