Acquisitions and other investments - Schedule of Purchase Price Allocation and Identifiable Assets Acquired and Liabilities Assumed - Summit (Details) - USD ($) $ in Millions	Jan. 03, 2023	Feb. 28, 2023	Aug. 31, 2022
Identifiable assets acquired and liabilities assumed:
Goodwill		$ 28,343	$ 22,280
Summit Health-CityMD
Purchase Price Allocation:
Purchase price	$ 4,790
Deferred consideration	100
Summit debt paid at closing	1,963
Fair value of equity consideration	1,980
Total	8,833
Identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	75
Accounts receivable, net	361
Property, plant and equipment	593
Intangible assets	3,359
Operating lease right-of-use assets	757
Other assets	192
Operating lease obligations	(773)
Deferred tax liability	(918)
Other liabilities	(507)
Total identifiable net assets	3,139
Goodwill	$ 5,693