Goodwill and Other Intangible Assets, Schedule of Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Nov. 30, 2015	Aug. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	$ 4,454	$ 4,387
Accumulated amortization	1,185	1,090
Total amortizable intangible assets, net	3,269	3,297
Total indefinite lived intangible assets	8,771	9,054
Total intangible assets, net	12,040	12,351
Purchased Prescription Files [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	899	885
Accumulated amortization	505	470
Favorable Lease Interests [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	459	440
Accumulated amortization	225	207
Purchasing and Payer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	94	94
Accumulated amortization	67	65
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	157	154
Accumulated amortization	100	92
Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	783	675
Accumulated amortization	97	83
Total indefinite lived intangible assets	6,363	6,590
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	1,344	1,409
Accumulated amortization	157	132
Loyalty Card Holders [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	718	730
Accumulated amortization	34	41
Pharmacy Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Total indefinite lived intangible assets	$ 2,408	$ 2,464