New Revenue Accounting Standard (Details) $ in Millions	6 Months Ended
	Jul. 29, 2018 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 63
Deferred revenue added during the period	194
Revenue recognized during the period	(153)
Ending balance	104
Calculated under Revenue Guidance in Effect before Topic 606
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	68
New Revenue Accounting Standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, net of tax	7
Change in Contract with Customer, Liability [Roll Forward]
Remaining performance obligation	$ 235
Percent of remaining performance obligations to be recognized (as percent)	50.00%
New Revenue Accounting Standard | Adjustment to retained earnings upon adoption of new revenue standard
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ (5)