Goodwill and Other Intangible Assets, Schedule of Goodwill (Details) $ in Millions	3 Months Ended
	Nov. 30, 2015 USD ($)
Goodwill [Roll Forward]
Net book value - Beginning Period	$ 16,372
Acquisitions	24
Other	(3)	[1]
Currency translation adjustments	(198)
Net book value - Ending Period	16,195
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	24
Other	(3)	[1]
Currency translation adjustments	(100)
Net book value - Ending Period	3,819
Pharmaceutical Wholesale [Member]
Goodwill [Roll Forward]
Net book value - Beginning Period	3,534
Acquisitions	0
Other	0	[1]
Currency translation adjustments	(98)
Net book value - Ending Period	$ 3,436

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