Related parties - Schedule of Related Parties (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021	Aug. 31, 2021
Related Party Transactions [Abstract]
Purchases, net	$ 15,063	$ 15,062	$ 30,854	$ 30,503
Trade accounts payable, net	$ 6,390		$ 6,390		$ 6,589

Amount for accounts payable to related parties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
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Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant