Goodwill and Other Intangible Assets, Schedule of Goodwill (Details) $ in Millions		9 Months Ended
		May. 31, 2015 USD ($)
Goodwill [Roll Forward]
Net book value - Beginning Period		$ 2,359
Acquisitions		15,966
Sale of business	[1]	(706)
Other	[2]	(3)
Currency translation adjustments		(255)
Net book value - Ending Period		17,361
Retail Pharmacy USA [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period		2,359
Acquisitions		8,588
Sale of business	[1]	(706)
Other	[2]	(3)
Currency translation adjustments		0
Net book value - Ending Period		10,238
Retail Pharmacy International [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period		0
Acquisitions		3,918
Sale of business	[1]	0
Other	[2]	0
Currency translation adjustments		(116)
Net book value - Ending Period		3,802
Pharmaceutical Wholesale [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period		0
Acquisitions		3,460
Sale of business	[1]	0
Other	[2]	0
Currency translation adjustments		(139)
Net book value - Ending Period		$ 3,321

[1] Represents goodwill associated with Walgreens Infusion Services business which was sold on April 7, 2015.

[2] Other primarily represents immaterial purchase accounting adjustments for prior year Company acquisitions.