Segment Information - Net Sales by Brand and Region (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
Segment Reporting Information [Line Items]
Credit Card Revenue		$ 139		$ 279
Net Sales	[1]	$ 4,085	$ 3,799	$ 7,868	$ 7,239
Percentage of Net Sales	[1]	100.00%	100.00%	100.00%	100.00%
U.S.
Segment Reporting Information [Line Items]
Net Sales	[1],[2]	$ 3,322	$ 3,038	$ 6,340	$ 5,771
Percentage of Net Sales	[1],[2]	82.00%	80.00%	81.00%	80.00%
Canada
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 303	$ 278	$ 558	$ 512
Percentage of Net Sales	[1]	7.00%	7.00%	7.00%	7.00%
Europe
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 148	$ 151	$ 287	$ 288
Percentage of Net Sales	[1]	4.00%	4.00%	4.00%	4.00%
Asia
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 262	$ 288	$ 583	$ 571
Percentage of Net Sales	[1]	6.00%	8.00%	7.00%	8.00%
Other Regions
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 50	$ 44	$ 100	$ 97
Percentage of Net Sales	[1]	1.00%	1.00%	1.00%	1.00%
Gap
Segment Reporting Information [Line Items]
Net Sales	[1]	$ 1,992	$ 1,757	$ 3,737	$ 3,319
Gap | U.S.
Segment Reporting Information [Line Items]
Net Sales	[1],[2]	1,816	1,596	3,406	3,022
Gap | Canada
Segment Reporting Information [Line Items]
Net Sales	[1]	151	133	278	244
Gap | Europe
Segment Reporting Information [Line Items]
Net Sales	[1]	0	0	0	0
Gap | Asia
Segment Reporting Information [Line Items]
Net Sales	[1]	11	12	23	21
Gap | Other Regions
Segment Reporting Information [Line Items]
Net Sales	[1]	14	16	30	32
Old Navy
Segment Reporting Information [Line Items]
Net Sales	[1]	1,225	1,232	2,429	2,390
Old Navy | U.S.
Segment Reporting Information [Line Items]
Net Sales	[1],[2]	728	719	1,408	1,387
Old Navy | Canada
Segment Reporting Information [Line Items]
Net Sales	[1]	94	91	171	168
Old Navy | Europe
Segment Reporting Information [Line Items]
Net Sales	[1]	145	148	280	281
Old Navy | Asia
Segment Reporting Information [Line Items]
Net Sales	[1]	229	252	513	502
Old Navy | Other Regions
Segment Reporting Information [Line Items]
Net Sales	[1]	29	22	57	52
Banana Republic
Segment Reporting Information [Line Items]
Net Sales	[1]	604	579	1,168	1,096
Banana Republic | U.S.
Segment Reporting Information [Line Items]
Net Sales	[1],[2]	514	492	993	929
Banana Republic | Canada
Segment Reporting Information [Line Items]
Net Sales	[1]	58	54	108	99
Banana Republic | Europe
Segment Reporting Information [Line Items]
Net Sales	[1]	3	3	7	7
Banana Republic | Asia
Segment Reporting Information [Line Items]
Net Sales	[1]	22	24	47	48
Banana Republic | Other Regions
Segment Reporting Information [Line Items]
Net Sales	[1]	7	6	13	13
Other
Segment Reporting Information [Line Items]
Net Sales	[1],[3]	264	231	534	434
Other | U.S.
Segment Reporting Information [Line Items]
Net Sales	[1],[2],[3]	264	231	533	433
Other | Canada
Segment Reporting Information [Line Items]
Net Sales	[1],[3]	0	0	1	1
Other | Europe
Segment Reporting Information [Line Items]
Net Sales	[1],[3]	0	0	0	0
Other | Asia
Segment Reporting Information [Line Items]
Net Sales	[1],[3]	0	0	0	0
Other | Other Regions
Segment Reporting Information [Line Items]
Net Sales	[1],[3]	$ 0	$ 0	$ 0	$ 0

[1] Net sales for the thirteen and twenty-six weeks ended August 4, 2018 reflect the adoption of the new revenue recognition standard, which resulted in an increase to net sales of $139 million and $279 million, respectively, for revenue sharing and reimbursements of loyalty program discounts associated with the Company's credit card programs, as well as breakage revenue for our gift cards and credit vouchers. Prior period amounts have not been restated and continue to be reported under accounting standards in effect for those periods.

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

[3] Primarily consists of net sales for the Athleta and Intermix brands.