Financial instruments - Summary of Derivative Income and Expenses Due to Fair Value Changes (Details) - Derivatives not designated as hedges: - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2024	Nov. 30, 2023
Total return swaps | Selling, general and administrative expenses
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	$ 11	$ (1)
Foreign currency forwards | Other expense, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	91	59
Variable prepaid forward contracts | Other expense, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	$ (200)	$ (366)