Acquisitions and other Investments - schedule of purchase price allocation and identifiable assets acquired and liabilities assumed - Care Centrix (Details) - USD ($) $ in Millions	Aug. 31, 2022	Aug. 31, 2023	Aug. 31, 2021
Identifiable assets acquired and liabilities assumed:
Goodwill	$ 22,280	$ 28,187	$ 12,421
CareCentrix, Inc.
Purchase price allocation:
Cash consideration	327
Contingent consideration	4
Fair value of equity consideration	66
Fair value of non-controlling interest	217
Total	614
Identifiable assets acquired and liabilities assumed:
Tangible assets	358
Intangible assets	426
Liabilities	(680)
Total identifiable net assets	104
Goodwill	$ 509