Financial instruments - Summary of Derivative Income and Expenses Due to Fair Value Changes (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
Total return swaps | Selling, general and administrative expenses
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	$ 2	$ 2	$ 19	$ 2
Foreign currency forwards | Other income, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	(14)	(112)	19	(203)
Variable Prepaid Forward | Other income, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	$ 155	$ (26)	$ (733)	$ (26)