Supplemental information - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Feb. 29, 2024	Aug. 31, 2023	Feb. 28, 2023	Aug. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 668	$ 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)	47	93
Cash, cash equivalents and restricted cash	$ 715	$ 856	$ 1,993	$ 2,558