Derivative Financial Instrument (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2017	May 01, 2016
Summary of Derivative Instruments [Abstract]
Derivative, Notional Amount	$ 200
Notional amount of FX forward contract, designated as cash flow hedges	74	$ 35
Notional amount of FX forward contract, not designated for hedge accounting	$ 51	$ 0