Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Mar. 17, 2015	Aug. 01, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2015
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	GPS
Entity Registrant Name	GAP INC
Entity Central Index Key	0000039911
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		418,771,239
Entity Public Float			$ 11.5
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No