CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Net sales	$ 103,444	$ 76,392	$ 72,217
Cost of sales	76,520	54,823	51,098
Gross Profit	26,924	21,569	21,119
Selling, general and administrative expense	22,571	17,992	17,543
Gain on sale of business	0	0	20
Equity earnings in Alliance Boots	315	617	496
Operating Income	4,668	4,194	4,092
Gain on previously held equity interest	563	0	0
Other income (expense)	685	(481)	120
Earnings Before Interest and Income Tax Provision	5,916	3,713	4,212
Interest expense, net	605	156	165
Earnings Before Income Tax Provision	5,311	3,557	4,047
Income tax provision	1,056	1,526	1,499
Post tax earnings from equity method investments	24	0	0
Net Earnings	4,279	2,031	2,548
Net earnings attributable to noncontrolling interests	59	99	0
Net Earnings Attributable to Walgreens Boots Alliance, Inc.	$ 4,220	$ 1,932	$ 2,548
Net earnings per common share attributable to Walgreens Boots Alliance, Inc. - basic (in dollars per share)	$ 4.05	$ 2.03	$ 2.69
Net earnings per common share attributable to Walgreens Boots Alliance, Inc. - diluted (in dollars per share)	$ 4.00	$ 2.00	$ 2.67
Average shares outstanding (in shares)	1,043.2	953.1	946.0
Dilutive effect of stock options (in shares)	10.7	12.1	9.2
Average diluted shares (in shares)	1,053.9	965.2	955.2