Acquisitions and other investments - Schedule of Purchase Price Allocation and Identifiable Assets Acquired and Liabilities Assumed - Summit (Details) - USD ($) $ in Millions	Jan. 03, 2023	May 31, 2023	Aug. 31, 2022
Identifiable assets acquired and liabilities assumed:
Goodwill		$ 28,371	$ 22,280
Summit Health-CityMD
Purchase Price Allocation:
Cash consideration	$ 4,778
Deferred consideration	100
Summit debt paid at closing	1,963
Fair value of equity consideration	1,971
Fair value of non-controlling interests	13
Total	8,825
Identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	71
Accounts receivable, net	371
Property, plant and equipment	607
Intangible assets	3,359
Operating lease right-of-use assets	761
Other assets	174
Operating lease obligations	(777)
Deferred tax liability	(918)
Other liabilities	(444)
Total identifiable net assets	3,203
Goodwill	$ 5,622