Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Millions	9 Months Ended
	May. 31, 2015	May. 31, 2014	Aug. 31, 2014
Supplemental Cash Flow Disclosures [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	366		$ 104
Purchase consideration transferred	$ 8,300
Ownership percentage (in hundredths)	45.00%
Fair value of assets acquired	$ 25,300
Liabilities assumed	19,700
Capital lease obligations		$ 322
Cash paid for interest	305	119
Cash paid for income taxes	961	$ 971
Walgreens Boots Alliance Development GmbH [Member]
Business Acquisition [Line Items]
Consideration received	$ 2,600