Property And Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Jan. 28, 2017
Property, Plant and Equipment [Line Items]
Property and Equipment, at Cost	$ 6,478	$ 5,991	$ 6,478	$ 5,991	$ 6,282
Accumulated Depreciation and Amortization	(3,637)	(3,405)	(3,637)	(3,405)	(3,541)
Property and Equipment, Net	2,841	2,586	2,841	2,586	$ 2,741
Depreciation	$ 140	$ 124	$ 282	$ 245