Goodwill and other intangible assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022	Aug. 31, 2022	Jun. 01, 2022	Jun. 01, 2021
Goodwill [Line Items]
Goodwill	$ 28,371		$ 28,371		$ 22,280
Impairment of intangible assets	299	$ 0	299	$ 0
Indefinite-lived intangible assets	5,387		5,387		5,528
Amortization of intangible assets	226	$ 148	583	$ 488
Minimum
Goodwill [Line Items]
Reporting unit fair value in excess of carrying amount (as a percent)						7.00%	7.00%
Maximum
Goodwill [Line Items]
Reporting unit fair value in excess of carrying amount (as a percent)						198.00%	18.00%
Boots Reporting Unit
Goodwill [Line Items]
Goodwill	962		962		906
Impairment of intangible assets	431
Indefinite-lived intangible assets	$ 5,400		$ 5,400		$ 5,500