Goodwill and Other Intangible Assets, Schedule of Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Nov. 30, 2016	Aug. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	$ 3,878	$ 4,044
Accumulated amortization	1,465	1,439
Total amortizable intangible assets, net	2,413	2,605
Total indefinite lived intangible assets	7,315	7,697
Total intangible assets, net	9,728	10,302
Customer Relationships and Loyalty Card Holders [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	1,765	1,867
Accumulated amortization	295	275
Purchased Prescription Files [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	939	932
Accumulated amortization	625	600
Favorable Lease Interests and Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	572	619
Accumulated amortization	358	388
Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	508	532
Accumulated amortization	115	105
Total indefinite lived intangible assets	5,326	5,604
Purchasing and Payer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amortizable Intangible Assets	94	94
Accumulated amortization	72	71
Pharmacy Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Total indefinite lived intangible assets	$ 1,989	$ 2,093