Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2014
Business Acquisition [Line Items]
Amortization expense for intangible assets	$ 104	$ 71	$ 368	$ 214
Foreign currency adjustments related to carrying amount			(84)
Currency translation adjustments related to accumulated amortization			3
Goodwill	17,361		17,361		$ 2,359
Indefinite-lived intangible assets, translation adjustments			(145)
Alliance Boots [Member]
Business Acquisition [Line Items]
Goodwill	15,944		15,944
Intangible assets	$ 10,658		$ 10,658