Segment Information - Reconciling Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (224)	$ (132)	$ (401)	$ (262)
Income from operations	571	1,157	929	2,452
All Other
Segment Reporting Information [Line Items]
Stock-based compensation expense	(224)	(132)	(401)	(262)
Unallocated cost of revenue and operating expenses	(66)	(65)	(135)	(129)
Acquisition-related and other costs	(5)	(2)	(15)	(4)
Legal settlement costs	(2)	0	(13)	0
Income from operations	$ (297)	$ (199)	$ (564)	$ (395)