Financial instruments - warrants (Details) - Derivatives not designated as hedges: - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Foreign currency forwards | Selling, general and administrative expense
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	$ 0	$ (75)	$ (63)
Foreign currency forwards | Other income (expense)
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	523	(8)	11
Total return swap | Selling, general and administrative expense
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	$ (33)	$ 58	$ 24