Supplementary Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Non-cash transactions [Abstract]
Non-cash transactions for debt assumed	$ 9,000
Non-cash transaction for common stock issued in relation to the second step transaction	11,000
Business Acquisition [Line Items]
Consideration received	439	$ 104
Fair value of assets acquired	26,600
Liabilities assumed	20,000
Capital lease obligations		$ 322	$ 77
Walgreens Boots Alliance [Member]
Business Acquisition [Line Items]
Purchase consideration transferred	$ 8,100
Ownership percentage	45.00%
Walgreens Boots Alliance Development GmbH [Member]
Business Acquisition [Line Items]
Consideration received	$ 2,600