Derivative Financial Instrument (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 26, 2015	Jul. 31, 2016	Jul. 26, 2015
Summary of Derivative Instruments [Abstract]
Notional amount of Interest rate swap			$ 200
Notional amount of FX forward contract, designated as hedge	$ 61		96
Notional amount of FX forward contract, non-designated as hedge	13
Unrealized losses on cash flow hedges	$ 3	$ 0	$ 4	$ 0