Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Aug. 31, 2015	Sep. 30, 2015	Feb. 28, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Walgreens Boots Alliance, Inc.
Entity Central Index Key	0001618921
Current Fiscal Year End Date	--08-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 71.6
Entity Common Stock, Shares Outstanding		1,088,793,571
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Aug. 31, 2015