Fair Value Measurements (Carrying Value And Fair Value Of Long-Term Debt, Disclosure) (Detail) - USD ($) $ in Millions		Oct. 28, 2017	Jan. 28, 2017	Oct. 29, 2016
Fair Value Measurements
Principal Value		$ 5,750	$ 5,750	$ 5,750
Fair Value (a)	[1]	$ 6,033	$ 6,030	$ 6,352

[1] The estimated fair value of the Company’s publicly traded debt is based on reported transaction prices which are considered Level 2 inputs in accordance with ASC Topic 820, Fair Value Measurement. The estimates presented are not necessarily indicative of the amounts that the Company could realize in a current market exchange.