Acquisitions and other Investments - narrative (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Mar. 03, 2023	Jan. 03, 2023	Dec. 28, 2022	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023	Aug. 31, 2023
Business Acquisition [Line Items]
Adjustments						$ 22
Goodwill				$ 15,814		15,814		$ 28,187
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
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				107		107
Other Acquisitions
Business Acquisition [Line Items]
Cash consideration, net				$ 69	$ 35	$ 172	$ 90