Goodwill and Other Intangible Assets, Schedule of Goodwill (Details) $ in Millions	6 Months Ended
	Feb. 29, 2016 USD ($)
Goodwill [Roll Forward]
Net book value - Beginning Period	$ 16,372
Acquisitions	19
Other	10	[1]
Currency translation adjustments	(605)
Net book value - Ending Period	15,796
Retail Pharmacy USA [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period	8,940
Acquisitions	0
Other	0	[1]
Currency translation adjustments	0
Net book value - Ending Period	8,940
Retail Pharmacy International [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period	3,898
Acquisitions	19
Other	(3)	[1]
Currency translation adjustments	(309)
Net book value - Ending Period	3,605
Pharmaceutical Wholesale [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period	3,534
Acquisitions	0
Other	13	[1]
Currency translation adjustments	(296)
Net book value - Ending Period	$ 3,251

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