Equity Method Investments (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Aug. 25, 2016	Mar. 18, 2016	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity earnings			$ 44	$ 24	$ 0
AmerisourceBergen Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Warrant issued to purchase common stock (in shares)	22,696,912	22,696,912	0
Warrant exercise price (in dollars per share)	$ 52.50	$ 51.50
Warrants aggregate exercise price payment	$ 1,190	$ 1,170
Outstanding shares owned (in shares)			56,854,867
Percentage of outstanding common shares owned			24.00%
Period of reporting lag			2 months 15 days
Period of using equity method accounting			3 months 15 days
Equity investment, exceeded its proportionate share of net assets			$ 4,500
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings			$ 44	$ 24
Alliance Boots [Member]
Schedule of Equity Method Investments [Line Items]
Period of reporting lag				3 months
Equity method investment ownership interest percentage				45.00%		45.00%