Acquisitions and other Investments - narrative (Details) - USD ($) $ in Millions					3 Months Ended			9 Months Ended
	May 08, 2024	Mar. 03, 2023	Jan. 03, 2023	Dec. 28, 2022	May 31, 2024	Nov. 30, 2023	May 31, 2023	May 31, 2024	May 31, 2023	Aug. 31, 2023
Business Acquisition [Line Items]
Adjustments								$ 19
Goodwill					$ 15,821			15,821		$ 28,187
Rite Aid Asset Acquisition
Business Acquisition [Line Items]
Payments to acquire productive assets	$ 375
VillageMD
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent			53.00%
Summit Heath-CityMD
Business Acquisition [Line Items]
Cash consideration			$ 7,000
Purchase price			4,850
Fair value of equity consideration			1,971
Deferred consideration			100
Business combination, consideration transferred, employees			87
Summit debt paid at closing			1,900
Intangible assets			3,359
Goodwill			5,454
Tax deductible goodwill			416
Summit Heath-CityMD | Partnership Interest
Business Acquisition [Line Items]
Fair value of equity consideration			2,050
Summit Heath-CityMD | Provider networks
Business Acquisition [Line Items]
Intangible assets			$ 1,900
Useful life of capitalized software costs			15 years
Summit Heath-CityMD | Trade Names
Business Acquisition [Line Items]
Intangible assets			$ 1,500
Summit Heath-CityMD | Minimum | Trade Names
Business Acquisition [Line Items]
Useful life of capitalized software costs			11 years
Summit Heath-CityMD | Maximum | Trade Names
Business Acquisition [Line Items]
Useful life of capitalized software costs			15 years
VillageMD
Business Acquisition [Line Items]
Fair value of equity consideration			$ 1,750
Debt instrument, fee amount, credit			220
VillageMD | Line of Credit
Business Acquisition [Line Items]
Face amount			2,250
VillageMD | Line of Credit | Term Loan
Business Acquisition [Line Items]
Face amount			1,750
VillageMD | Line of Credit | Credit facilities
Business Acquisition [Line Items]
Face amount			500
VillageMD | Cigna
Business Acquisition [Line Items]
Fair value of equity consideration			$ 2,500
CareCentrix
Business Acquisition [Line Items]
Purchase price						$ 378
Shields Health Solutions Parent, LLC
Business Acquisition [Line Items]
Purchase price				$ 1,400
Starling MSO Holdings, LLC
Business Acquisition [Line Items]
Cash consideration		$ 284
Purchase price		222
Fair value of equity consideration		$ 62
Intangible assets					128			128
Goodwill					103			103
Other Acquisitions
Business Acquisition [Line Items]
Cash consideration, net					$ 49		$ 37	$ 221	$ 127