Financial instruments - warrants (Details) - Derivatives not designated as hedges: - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2022
Foreign currency forwards | Other income (expense)
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	$ (39)	$ (273)	$ 523
Total return swaps | Selling, general and administrative expense
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	29	12	(33)
Variable prepaid forward | Other income (expense)
Warrants [Abstract]
Gains (losses) due to changes in fair value of derivative instruments	$ (946)	$ 19	$ 0