Supplemental Guarantor Condensed Consolidating Financial Information, Statements of Earnings (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Consolidated Condensed Statements of Earnings [Abstract]
Net sales		$ 26,573	$ 19,605	$ 46,127	$ 37,934
Cost of sales		19,691	13,955	33,949	27,132
Gross Profit		6,882	5,650	12,178	10,802
Selling, general and administrative expenses		5,606	4,569	10,062	8,948
Equity earnings in Alliance Boots		101	136	315	330
Operating Income (loss)		1,377	1,217	2,431	2,184
Gain on previously held equity interest	706	706	0	706	0
Other income (expense)		504	(59)	703	166
Earnings (loss) before Interest and Tax Provision		2,587	1,158	3,840	2,350
Interest expense, net		144	37	199	78
Earnings (loss) Before Income Tax Provision		2,443	1,121	3,641	2,272
Income tax provision		391	391	712	810
Post tax earnings from equity method investments		8	0	8	0
Equity in income of subsidiaries		0	0	0	0
Net Earnings (loss)		2,060	730	2,937	1,462
Net earnings attributable to noncontrolling interests		18	14	45	23
Net Earnings (loss) Attributable to Walgreens Boots Alliance, Inc.		2,042	716	2,892	1,439
Guarantor/Issuer Subsidiary [Member]
Consolidated Condensed Statements of Earnings [Abstract]
Net sales		14,379	13,364	27,702	25,872
Cost of sales		9,949	9,027	19,160	17,599
Gross Profit		4,430	4,336	8,542	8,273
Selling, general and administrative expenses		4,596	4,095	8,608	7,753
Equity earnings in Alliance Boots		0	0	0	0
Operating Income (loss)		(166)	242	(66)	520
Gain on previously held equity interest		0	0	0	0
Other income (expense)		(69)	0	(166)	0
Earnings (loss) before Interest and Tax Provision		(235)	242	(232)	520
Interest expense, net		106	45	153	90
Earnings (loss) Before Income Tax Provision		(341)	197	(385)	430
Income tax provision		(171)	69	(190)	163
Post tax earnings from equity method investments		0		0
Equity in income of subsidiaries		2,222	602	3,133	1,195
Net Earnings (loss)		2,052	730	2,938	1,462
Net earnings attributable to noncontrolling interests		0	0	0	0
Net Earnings (loss) Attributable to Walgreens Boots Alliance, Inc.		2,052	730	2,938	1,462
Non-guarantor Subsidiaries [Member]
Consolidated Condensed Statements of Earnings [Abstract]
Net sales		12,545	6,363	19,168	12,278
Cost of sales		10,033	4,985	15,416	9,632
Gross Profit		2,512	1,378	3,752	2,646
Selling, general and administrative expenses		1,117	539	1,617	1,312
Equity earnings in Alliance Boots		101	136	315	330
Operating Income (loss)		1,496	975	2,450	1,664
Gain on previously held equity interest		706	0	706	0
Other income (expense)		575	(59)	871	166
Earnings (loss) before Interest and Tax Provision		2,777	916	4,027	1,830
Interest expense, net		6	(8)	0	(12)
Earnings (loss) Before Income Tax Provision		2,771	924	4,027	1,842
Income tax provision		557	322	902	647
Post tax earnings from equity method investments		8		8
Equity in income of subsidiaries		0	0	0	0
Net Earnings (loss)		2,222	602	3,133	1,195
Net earnings attributable to noncontrolling interests		18	14	45	23
Net Earnings (loss) Attributable to Walgreens Boots Alliance, Inc.		2,204	588	3,088	1,172
Parent Company [Member]
Consolidated Condensed Statements of Earnings [Abstract]
Net sales		0	0	0	0
Cost of sales		0	0	0	0
Gross Profit		0	0	0	0
Selling, general and administrative expenses		(47)	0	(47)	0
Equity earnings in Alliance Boots		0	0	0	0
Operating Income (loss)		47	0	47	0
Gain on previously held equity interest		0	0	0	0
Other income (expense)		(2)	0	(2)	0
Earnings (loss) before Interest and Tax Provision		45	0	45	0
Interest expense, net		32	0	46	0
Earnings (loss) Before Income Tax Provision		13	0	(1)	0
Income tax provision		5	0	0	0
Post tax earnings from equity method investments		0		0
Equity in income of subsidiaries		2,052	0	2,938	0
Net Earnings (loss)		2,060	0	2,937	0
Net earnings attributable to noncontrolling interests		0	0	0	0
Net Earnings (loss) Attributable to Walgreens Boots Alliance, Inc.		2,060	0	2,937	0
Consolidating Adjustments [Member]
Consolidated Condensed Statements of Earnings [Abstract]
Net sales		(351)	(122)	(743)	(216)
Cost of sales		(291)	(57)	(627)	(99)
Gross Profit		(60)	(65)	(116)	(117)
Selling, general and administrative expenses		(60)	(65)	(116)	(117)
Equity earnings in Alliance Boots		0	0	0	0
Operating Income (loss)		0	0	0	0
Gain on previously held equity interest		0	0	0	0
Other income (expense)		0	0	0	0
Earnings (loss) before Interest and Tax Provision		0	0	0	0
Interest expense, net		0	0	0	0
Earnings (loss) Before Income Tax Provision		0	0	0	0
Income tax provision		0	0	0	0
Post tax earnings from equity method investments		0		0
Equity in income of subsidiaries		(4,274)	(602)	(6,071)	(1,195)
Net Earnings (loss)		(4,274)	(602)	(6,071)	(1,195)
Net earnings attributable to noncontrolling interests		0	0	0	0
Net Earnings (loss) Attributable to Walgreens Boots Alliance, Inc.		$ (4,274)	$ (602)	$ (6,071)	$ (1,195)