Segment Information - Net Sales by Brand and Region (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jul. 29, 2017		Jul. 30, 2016		Jul. 29, 2017		Jul. 30, 2016
Segment Reporting Information [Line Items]
Net sales		$ 3,799		$ 3,851		$ 7,239		$ 7,289
Percentage of Net Sales		100.00%		100.00%		100.00%		100.00%
U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 3,038		$ 2,972		$ 5,771		$ 5,630
Percentage of Net Sales	[1]	80.00%		77.00%		80.00%		77.00%
Canada
Segment Reporting Information [Line Items]
Net sales		$ 278		$ 278		$ 512		$ 494
Percentage of Net Sales		7.00%		7.00%		7.00%		7.00%
Europe
Segment Reporting Information [Line Items]
Net sales		$ 151		$ 176		$ 288		$ 334
Percentage of Net Sales		4.00%		5.00%		4.00%		5.00%
Asia
Segment Reporting Information [Line Items]
Net sales		$ 288		$ 375		$ 571		$ 731
Percentage of Net Sales		8.00%		10.00%		8.00%		10.00%
Other Regions
Segment Reporting Information [Line Items]
Net sales		$ 44		$ 50		$ 97		$ 100
Percentage of Net Sales		1.00%		1.00%		1.00%		1.00%
Gap
Segment Reporting Information [Line Items]
Net sales		$ 1,232		$ 1,313		$ 2,390		$ 2,536
Gap | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	719		749		1,387		1,447
Gap | Canada
Segment Reporting Information [Line Items]
Net sales		91		92		168		162
Gap | Europe
Segment Reporting Information [Line Items]
Net sales		148		159		281		303
Gap | Asia
Segment Reporting Information [Line Items]
Net sales		252		280		502		560
Gap | Other Regions
Segment Reporting Information [Line Items]
Net sales		22		33		52		64
Old Navy
Segment Reporting Information [Line Items]
Net sales		1,757		1,705		3,319		3,191
Old Navy | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	1,596		1,500		3,022		2,828
Old Navy | Canada
Segment Reporting Information [Line Items]
Net sales		133		129		244		227
Old Navy | Europe
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Old Navy | Asia
Segment Reporting Information [Line Items]
Net sales		12		66		21		116
Old Navy | Other Regions
Segment Reporting Information [Line Items]
Net sales		16		10		32		20
Banana Republic
Segment Reporting Information [Line Items]
Net sales		579		633		1,096		1,183
Banana Republic | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	492		523		929		977
Banana Republic | Canada
Segment Reporting Information [Line Items]
Net sales		54		57		99		104
Banana Republic | Europe
Segment Reporting Information [Line Items]
Net sales		3		17		7		31
Banana Republic | Asia
Segment Reporting Information [Line Items]
Net sales		24		29		48		55
Banana Republic | Other Regions
Segment Reporting Information [Line Items]
Net sales		6		7		13		16
Other
Segment Reporting Information [Line Items]
Net sales		231	[2]	200	[3]	434	[2]	379	[3]
Other | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	231	[2]	200	[3]	433	[2]	378	[3]
Other | Canada
Segment Reporting Information [Line Items]
Net sales		0	[2]	0	[3]	1	[2]	1	[3]
Other | Europe
Segment Reporting Information [Line Items]
Net sales		0	[2]	0	[3]	0	[2]	0	[3]
Other | Asia
Segment Reporting Information [Line Items]
Net sales		0	[2]	0	[3]	0	[2]	0	[3]
Other | Other Regions
Segment Reporting Information [Line Items]
Net sales		$ 0	[2]	$ 0	[3]	$ 0	[2]	$ 0	[3]

[1] U.S. includes the United States, Puerto Rico, and Guam.

[2] Includes Athleta, Intermix, and Weddington Way.

[3] Includes Athleta and Intermix.