Supplemental information - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Aug. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 784	$ 739
Cash and cash equivalents - assets held for sale (included in other current assets)	0	24
Restricted cash - (included in other current and non-current assets)	62	93
Cash, cash equivalents and restricted cash	$ 846	$ 856	$ 4,314	$ 2,558