Equity Method Investments (Details) - USD ($) $ in Millions		3 Months Ended
		Nov. 30, 2015	Nov. 30, 2014		Aug. 31, 2015
Schedule of Equity Method Investments [Line Items]
Non-controlling interests		$ 165			$ 163
Equity earnings	[1]	$ 11	$ 216	[2]
Alliance Boots [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings			$ 214

[1] Earnings in foreign equity method investments are translated at their respective average exchange rates.

[2] Includes equity method investment in Alliance Boots. See Note 1, Organization.