Financial instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Millions	Feb. 29, 2024	Aug. 31, 2023
Other current assets | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets		$ 31
Fair value, assets		1
Other current assets | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	$ 537	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	8
Other current assets | Total return swaps | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, assets	174	168
Fair value, assets	3	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	14	28
Other current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	874	805
Fair value, liabilities	3	2
Other current liabilities | Foreign currency forwards | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,480	817
Fair value, liabilities	12	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	28	26
Fair value, liabilities	0	1
Other non-current liabilities | Foreign currency forwards | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities		4
Fair value, liabilities		0
Other non-current liabilities | Variable Prepaid Forward | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount, liabilities	3,726	3,195
Fair value, liabilities	$ 3,861	$ 2,548