Derivative Financial Instruments - Fair Values of Asset and Liability Derivative Financial Instruments (Details) - USD ($) $ in Millions	Aug. 01, 2026	Jan. 31, 2026	Aug. 02, 2025
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	$ 21	$ 8	$ 9
Derivative financial instruments, liabilities	3	9	6
Foreign Exchange Forward Contract
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	21	8	9
Derivative financial instruments, liabilities	3	9	6
Derivatives in cash flow hedging relationships \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative financial instruments, liabilities	0	2	1
Derivatives in cash flow hedging relationships \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: us-gaap:OtherAssets
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	3	0	2
Derivatives in cash flow hedging relationships \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	11	7	4
Derivatives in cash flow hedging relationships \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: gap:LeaseIncentiveAndOtherLongTermLiabilities
Derivatives, Fair Value [Line Items]
Derivative financial instruments, liabilities	1	0	0
Not Designated as Hedging Instrument \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative financial instruments, liabilities	2	7	5
Not Designated as Hedging Instrument \| Foreign Exchange Forward Contract \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	$ 7	$ 1	$ 3