Business Combinations, Definite-Lived Intangible Assets, Net and Goodwill (Intangible Assets Detail) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2020	Aug. 02, 2019	Jul. 31, 2020	Aug. 02, 2019	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,853		$ 1,853		$ 1,922
Accumulated Amortization	(744)		(744)		(750)
Net Book Value	1,109		1,109		1,172
Amortization expense	81	$ 70	161	$ 140
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	970		970		1,030
Accumulated Amortization	(432)		(432)		(488)
Net Book Value	538		538		542
Customer relationships and customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	730		730		739
Accumulated Amortization	(234)		(234)		(200)
Net Book Value	496		496		539
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	132		132		131
Accumulated Amortization	(68)		(68)		(58)
Net Book Value	64		64		73
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21		21		22
Accumulated Amortization	(10)		(10)		(4)
Net Book Value	$ 11		$ 11		$ 18
Weighted Average | Purchased technology
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			5 years 6 months		5 years 8 months 12 days
Weighted Average | Customer relationships and customer lists
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			11 years 4 months 24 days		11 years 4 months 24 days
Weighted Average | Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			7 years 7 months 6 days		7 years 7 months 6 days
Weighted Average | Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			2 years		2 years