Segment Information - Net Sales by Brand and Region (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017		Jan. 30, 2016		Jan. 31, 2015
Segment Reporting Information [Line Items]
Net sales		$ 4,429	$ 3,798	$ 3,851	$ 3,438	$ 4,385	$ 3,857	$ 3,898	$ 3,657	$ 15,516		$ 15,797		$ 16,435
Percentage Of Net Sales										100.00%		100.00%		100.00%
U.S.
Segment Reporting Information [Line Items]
Net sales	[1]									$ 11,989		$ 12,213		$ 12,672
Percentage Of Net Sales										77.00%		77.00%		77.00%
Canada
Segment Reporting Information [Line Items]
Net sales										$ 1,084		$ 1,047		$ 1,137
Percentage Of Net Sales										7.00%		7.00%		7.00%
Europe
Segment Reporting Information [Line Items]
Net sales										$ 689		$ 797		$ 917
Percentage Of Net Sales										5.00%		5.00%		6.00%
Asia
Segment Reporting Information [Line Items]
Net sales										$ 1,544		$ 1,521		$ 1,502
Percentage Of Net Sales										10.00%		10.00%		9.00%
Other Regions
Segment Reporting Information [Line Items]
Net sales										$ 210		$ 219		$ 207
Percentage Of Net Sales										1.00%		1.00%		1.00%
Gap Global
Segment Reporting Information [Line Items]
Net sales										$ 5,455		$ 5,751		$ 6,165
Gap Global | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]									3,113		3,303		3,575
Gap Global | Canada
Segment Reporting Information [Line Items]
Net sales										368		348		384
Gap Global | Europe
Segment Reporting Information [Line Items]
Net sales										630		726		824
Gap Global | Asia
Segment Reporting Information [Line Items]
Net sales										1,215		1,215		1,208
Gap Global | Other Regions
Segment Reporting Information [Line Items]
Net sales										129		159		174
Old Navy Global
Segment Reporting Information [Line Items]
Net sales										6,814		6,675		6,619
Old Navy Global | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]									6,051		5,987		5,967
Old Navy Global | Canada
Segment Reporting Information [Line Items]
Net sales										490		467		500
Old Navy Global | Europe
Segment Reporting Information [Line Items]
Net sales										0		0		0
Old Navy Global | Asia
Segment Reporting Information [Line Items]
Net sales										220		194		149
Old Navy Global | Other Regions
Segment Reporting Information [Line Items]
Net sales										53		27		3
Banana Republic Global
Segment Reporting Information [Line Items]
Net sales										2,471		2,656		2,922
Banana Republic Global | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]									2,052		2,211		2,405
Banana Republic Global | Canada
Segment Reporting Information [Line Items]
Net sales										223		229		249
Banana Republic Global | Europe
Segment Reporting Information [Line Items]
Net sales										59		71		93
Banana Republic Global | Asia
Segment Reporting Information [Line Items]
Net sales										109		112		145
Banana Republic Global | Other Regions
Segment Reporting Information [Line Items]
Net sales										28		33		30
Other entities
Segment Reporting Information [Line Items]
Net sales										776	[2]	715	[3]	729	[3]
Other entities | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]									773	[2]	712	[3]	725	[3]
Other entities | Canada
Segment Reporting Information [Line Items]
Net sales										3	[2]	3	[3]	4	[3]
Other entities | Europe
Segment Reporting Information [Line Items]
Net sales										0	[2]	0	[3]	0	[3]
Other entities | Asia
Segment Reporting Information [Line Items]
Net sales										0	[2]	0	[3]	0	[3]
Other entities | Other Regions
Segment Reporting Information [Line Items]
Net sales										$ 0	[2]	$ 0	[3]	$ 0	[3]

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

[2] Includes Athleta, Intermix, and beginning in the fourth quarter of fiscal 2016, Weddington Way.

[3] Includes Athleta, Intermix, and Piperlime, which was discontinued as of the first quarter of fiscal 2015.