Income taxes - components of earnings before income tax provision (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Income Tax Disclosure [Abstract]
U.S.	$ 2,998	$ 61	$ 759
Non–U.S.	987	1,934	(313)
Earnings before income tax provision	$ 3,985	$ 1,995	$ 446