Fair Value Measurements (Summary Of Carrying Value And Fair Value Estimate Of Long-Term Debt) (Details) - USD ($) $ in Millions		Aug. 01, 2015	Jan. 31, 2015	Aug. 02, 2014
Fair Value Measurements, Long-term Debt [Line Items]
Carrying value of long-term debt	[1]	$ 3,141	$ 3,131	$ 3,118
Level 2 [Member]
Fair Value Measurements, Long-term Debt [Line Items]
Fair value of long-term debt		$ 3,526	$ 3,693	$ 3,551

[1] The carrying value of long-term debt includes the remaining unamortized adjustment from our previous effective fair value hedge.