Income taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
May 31, 2023	May 31, 2023	May 31, 2022
Income Tax Disclosure [Abstract]
Effective tax rate	86.30%	33.80%	4.30%
Income taxes paid		$ 170	$ 291

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-2

Name:	us-gaap_IncomeTaxesPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration