Financial instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Millions	Feb. 28, 2025	Aug. 31, 2024
Other current assets | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	$ 281	$ 7
Fair value, assets	1	0
Other current assets | Foreign currency forwards | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	455	534
Fair value, assets	2	3
Other current assets | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	50	50
Fair value, assets	2	1
Other current assets | Total return swaps | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	53	211
Fair value, assets	0	11
Other non-current assets | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets		4
Fair value, assets		0
Other non-current assets | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	250	253
Fair value, assets	9	5
Accrued Liabilities | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	950	923
Fair value, liabilities	4	15
Accrued Liabilities | Foreign currency forwards | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,205	3,606
Fair value, liabilities	15	52
Accrued Liabilities | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities		356
Fair value, liabilities		5
Accrued Liabilities | Total return swaps | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	158
Fair value, liabilities	6
Accrued Liabilities | Variable prepaid forward contracts | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	2,190	1,185
Fair value, liabilities	2,498	1,332
Other non-current liabilities | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	2	2
Fair value, liabilities	0	0
Other non-current liabilities | Variable prepaid forward contracts | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	106	2,541
Fair value, liabilities	$ 112	$ 2,587