Property And Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016	Jan. 28, 2017
Property, Plant and Equipment [Line Items]
Property and Equipment, at Cost	$ 6,608	$ 6,218	$ 6,608	$ 6,218	$ 6,282
Accumulated Depreciation and Amortization	(3,688)	(3,448)	(3,688)	(3,448)	(3,541)
Property and Equipment, Net	2,920	2,770	2,920	2,770	$ 2,741
Depreciation	$ 144	$ 133	$ 426	$ 378