Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Feb. 03, 2018	Mar. 14, 2018	Jul. 28, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Feb. 03, 2018
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	GPS
Entity Registrant Name	GAP INC
Entity Central Index Key	0000039911
Current Fiscal Year End Date	--02-03
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		389,318,839
Entity Public Float			$ 5
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No