Revenue, Unearned Revenue and Remaining Performance Obligations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 30, 2020	Nov. 01, 2019	Oct. 30, 2020	Nov. 01, 2019	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract assets	$ 46		$ 46		$ 26
Deferred commissions, current	27		27		13
Deferred commissions, non-current	1,000		1,000		938
Amortization of deferred commissions	113	$ 93	$ 319	$ 270
Remaining weighted average contractual duration			2 years
Current period billings	1,700		$ 5,400
Revenue recognized from amounts previously classified as unearned revenue	1,900	$ 1,600	5,500	$ 4,700
Unearned revenue acquired with business combinations			33
Disaggregation of Revenue [Line Items]
Accrued expenses and other	2,232		2,232		2,151
Other liabilities	512		512		347
Customer Deposits
Disaggregation of Revenue [Line Items]
Accrued expenses and other	275		275		247
Other liabilities	$ 152		$ 152		$ 143