Segment Information - Net Sales by Brand and Region (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Oct. 29, 2016		Oct. 31, 2015		Oct. 29, 2016		Oct. 31, 2015
Segment Reporting Information [Line Items]
Net sales		$ 3,798		$ 3,857		$ 11,087		$ 11,412
Percentage of Net Sales		100.00%		100.00%		100.00%		100.00%
Sales growth (decline)		(2.00%)		(3.00%)		(3.00%)		(3.00%)
U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 2,914		$ 2,966		$ 8,544		$ 8,829
Percentage of Net Sales	[1]	77.00%		77.00%		77.00%		77.00%
Canada
Segment Reporting Information [Line Items]
Net sales		$ 289		$ 268		$ 783		$ 764
Percentage of Net Sales		8.00%		7.00%		7.00%		7.00%
Europe
Segment Reporting Information [Line Items]
Net sales		$ 164		$ 199		$ 498		$ 576
Percentage of Net Sales		4.00%		5.00%		5.00%		5.00%
Asia
Segment Reporting Information [Line Items]
Net sales		$ 376		$ 376		$ 1,107		$ 1,077
Percentage of Net Sales		10.00%		10.00%		10.00%		10.00%
Other Regions
Segment Reporting Information [Line Items]
Net sales		$ 55		$ 48		$ 155		$ 166
Percentage of Net Sales		1.00%		1.00%		1.00%		1.00%
Gap
Segment Reporting Information [Line Items]
Net sales		$ 1,340		$ 1,448		$ 3,876		$ 4,124
Sales growth (decline)		(7.00%)		(7.00%)		(6.00%)		(8.00%)
Gap | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 756		$ 838		$ 2,203		$ 2,368
Gap | Canada
Segment Reporting Information [Line Items]
Net sales		102		94		264		251
Gap | Europe
Segment Reporting Information [Line Items]
Net sales		150		182		453		522
Gap | Asia
Segment Reporting Information [Line Items]
Net sales		296		300		856		855
Gap | Other Regions
Segment Reporting Information [Line Items]
Net sales		36		34		100		128
Old Navy
Segment Reporting Information [Line Items]
Net sales		$ 1,705		$ 1,623		$ 4,896		$ 4,850
Sales growth (decline)		5.00%		4.00%		1.00%		4.00%
Old Navy | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 1,507		$ 1,449		$ 4,335		$ 4,352
Old Navy | Canada
Segment Reporting Information [Line Items]
Net sales		131		118		358		344
Old Navy | Europe
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Old Navy | Asia
Segment Reporting Information [Line Items]
Net sales		55		50		171		142
Old Navy | Other Regions
Segment Reporting Information [Line Items]
Net sales		12		6		32		12
Banana Republic
Segment Reporting Information [Line Items]
Net sales		$ 580		$ 627		$ 1,763		$ 1,925
Sales growth (decline)		(7.00%)		(11.00%)		(8.00%)		(7.00%)
Banana Republic | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 479		$ 520		$ 1,456		$ 1,598
Banana Republic | Canada
Segment Reporting Information [Line Items]
Net sales		55		56		159		167
Banana Republic | Europe
Segment Reporting Information [Line Items]
Net sales		14		17		45		54
Banana Republic | Asia
Segment Reporting Information [Line Items]
Net sales		25		26		80		80
Banana Republic | Other Regions
Segment Reporting Information [Line Items]
Net sales		7		8		23		26
Other
Segment Reporting Information [Line Items]
Net sales		$ 173	[2]	$ 159	[2]	$ 552	[2]	$ 513	[3]
Sales growth (decline)		9.00%	[2]	4.00%	[2]	8.00%	[2]	(2.00%)	[3]
Other | U.S.
Segment Reporting Information [Line Items]
Net sales	[1]	$ 172	[2]	$ 159	[2]	$ 550	[2]	$ 511	[3]
Other | Canada
Segment Reporting Information [Line Items]
Net sales		1	[2]	0	[2]	2	[2]	2	[3]
Other | Europe
Segment Reporting Information [Line Items]
Net sales		0	[2]	0	[2]	0	[2]	0	[3]
Other | Asia
Segment Reporting Information [Line Items]
Net sales		0	[2]	0	[2]	0	[2]	0	[3]
Other | Other Regions
Segment Reporting Information [Line Items]
Net sales		$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 0	[3]

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

[2] Includes Athleta and Intermix.

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