Goodwill and other intangible assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Aug. 31, 2023
Goodwill [Line Items]
Goodwill	$ 28,184		$ 28,187
Indefinite-lived intangible assets	5,380		$ 5,477
Amortization of intangible assets	$ 240	$ 159