Equity method investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	Nov. 30, 2024	Aug. 31, 2024
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 2,172	$ 2,269
Cencora
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 1,574	$ 1,563
Ownership percentage	10.00%	10.00%
Others
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 598	$ 705
Others | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	8.00%	8.00%
Others | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%