Segment Information - Reconciling Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 27, 2019	Oct. 28, 2018	Oct. 27, 2019	Oct. 28, 2018
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ (223)	$ (140)	$ (624)	$ (400)
Income from operations	927	1,058	1,856	3,510
All Other
Segment Reporting Information [Line Items]
Stock-based compensation expense	(223)	(140)	(624)	(400)
Unallocated cost of revenue and operating expenses	(63)	(76)	(198)	(205)
Acquisition-related and other costs	(7)	3	(22)	(1)
Legal settlement costs	0	(15)	(13)	(17)
Income from operations	$ (293)	$ (228)	$ (857)	$ (623)