CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Income Statement [Abstract]
Sales	$ 34,334	$ 30,118	$ 98,095	$ 88,065
Cost of sales	26,554	22,973	74,878	66,243
Gross profit	7,780	7,145	23,217	21,822
Selling, general and administrative expenses	6,231	5,712	18,456	17,522
Equity earnings in AmerisourceBergen	52	84	142	143
Operating income	1,601	1,517	4,903	4,443
Other income (expense)	(4)	(8)	(132)	(22)
Earnings before interest and income tax provision	1,597	1,509	4,771	4,421
Interest expense, net	157	155	457	500
Earnings before income tax provision	1,440	1,354	4,314	3,921
Income tax provision	109	168	839	634
Post tax earnings (loss) from other equity method investments	15	(21)	42	7
Net earnings	1,346	1,165	3,517	3,294
Net earnings attributable to noncontrolling interests	4	3	5	18
Net earnings attributable to Walgreens Boots Alliance, Inc.	$ 1,342	$ 1,162	$ 3,512	$ 3,276
Net earnings per common share:
Basic (in dollars per share)	$ 1.35	$ 1.08	$ 3.52	$ 3.03
Diluted (in dollars per share)	1.35	1.07	3.51	3.02
Dividends declared per share (in dollars per share)	$ 0.40	$ 0.3750	$ 1.20	$ 1.1250
Weighted average common shares outstanding:
Basic (in shares)	992.1	1,077.1	996.4	1,079.6
Diluted (in shares)	995.3	1,082.6	1,000.6	1,085.5