Document and Entity Information - shares	9 Months Ended
	May 31, 2016	Jun. 30, 2016
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 Common Stock, Shares Outstanding		1,082,317,487
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 31, 2016