Financial instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Millions	May 31, 2025	Aug. 31, 2024
Other current assets | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	$ 79	$ 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	236	534
Fair value, assets	1	3
Other current assets | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets		50
Fair value, assets		1
Other current assets | Total return swaps | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, assets	195	211
Fair value, assets	6	11
Accrued expenses and other liabilities | Foreign currency forwards | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	1,356	923
Fair value, liabilities	15	15
Accrued expenses and other liabilities | Foreign currency forwards | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,343	3,606
Fair value, liabilities	24	52
Accrued expenses and other liabilities | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	51	356
Fair value, liabilities	1	5
Accrued expenses and other liabilities | Variable prepaid forward contracts | Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	1,792	1,185
Fair value, liabilities	2,404	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 | Cross currency interest rate swaps | Derivatives designated as hedges:
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	259
Fair value, liabilities	6
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	$ 131	2,587
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		253
Fair value, assets		$ 5