Derivative Financial Instruments - Fair Values of Asset and Liability Derivative Financial Instruments (Details) - USD ($) $ in Millions	May 02, 2026	Jan. 31, 2026	May 03, 2025
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	$ 7	$ 8	$ 5
Derivative financial instruments, liabilities	6	9	14
Foreign Exchange Forward Contract
Derivatives, Fair Value [Line Items]
Derivative financial instruments, assets	7	8	5
Derivative financial instruments, liabilities	6	9	14
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	2	2	3
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	6	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	3	7	11
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	$ 1	$ 1	$ 1