Financial instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Millions	May 31, 2024	Aug. 31, 2023
Other current assets | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	$ 283	$ 31
Fair value, assets	1	1
Other current assets | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	1,593	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	400
Fair value, assets	8
Other current assets | Total return swaps | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	159	168
Fair value, assets	1	1
Other non-current assets | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	4
Fair value, assets	0
Other non-current assets | Cross currency interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	250	650
Fair value, assets	10	28
Other current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	614	805
Fair value, liabilities	2	2
Other current liabilities | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	2,415	817
Fair value, liabilities	9	2
Other current liabilities | Cross currency interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities		102
Fair value, liabilities		2
Other current liabilities | Total return swaps | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	43	26
Fair value, liabilities	0	1
Other current liabilities | Variable Prepaid Forward | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	408
Fair value, liabilities	407
Other non-current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	2
Notional amount, liabilities		4
Fair value, assets	0
Fair value, liabilities		0
Other non-current liabilities | Variable Prepaid Forward | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,318	3,195
Fair value, liabilities	$ 3,298	$ 2,548