Revenue, Unearned Revenue and Remaining Performance Obligations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	May 01, 2020	May 03, 2019	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract assets	$ 37		$ 26
Deferred commissions, current	18		13
Deferred commissions, non-current	950		938
Amortization of deferred commissions	$ 100	$ 88
Remaining weighted average contractual duration	2 years
Current period billings	$ 1,700
Revenue recognized from amounts previously classified as unearned revenue	1,800	$ 1,500
Disaggregation of Revenue [Line Items]
Accrued expenses and other	1,922		2,151
Other liabilities	346		347
Customer Deposits
Disaggregation of Revenue [Line Items]
Accrued expenses and other	257		247
Other liabilities	$ 138		$ 143