Financial instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Aug. 31, 2023
Foreign currency forwards | Not Designated as Hedging Instrument | Other income, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	$ 59	$ (18)
Total return swaps | Not Designated as Hedging Instrument | Selling, general and administrative expenses
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	(1)	4
Variable Prepaid Forward | Not Designated as Hedging Instrument | Other income, net
Derivatives, Fair Value [Line Items]
Loss on variable prepaid forward contracts	(366)	$ 0
Other current assets | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	1		$ 31
Fair value, assets	0		1
Other current assets | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	352		3,139
Fair value, assets	1		6
Other current assets | Cross currency interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	350
Fair value, assets	12
Other current assets | Total return swaps | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	186		168
Fair value, assets	8		1
Other non-current assets | Cross currency interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	300		650
Fair value, assets	18		28
Other current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	778		805
Fair value, liabilities	6		2
Other current liabilities | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,454		817
Fair value, liabilities	19		2
Other current liabilities | Cross currency interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	101		102
Fair value, liabilities	1		2
Other current liabilities | Total return swaps | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities			26
Fair value, liabilities			1
Other non-current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	1		4
Fair value, liabilities	0		0
Other non-current liabilities | Variable Prepaid Forward | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,726		3,195
Fair value, liabilities	$ 3,338		$ 2,548