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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Derivatives Designated as Hedging Instruments [Member]      
Derivative [Line Items]      
Gain included in AOCL     $ 0
Derivatives Designated as Hedging Instruments [Member] | Forward Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Notional value of contracts outstanding   $ 138  
Amount of hedge gain (loss) included in AOCI   2  
Increase (decrease) in fair value of hedge positions $ 1 1 $ 4
Derivatives Designated as Non-Hedging Instruments [Member] | Forward Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Notional value of contracts outstanding   $ 2  
Foreign exchange derivative NOT designated as cash flow hedges, gain (loss) $ 1    
Maximum [Member] | Derivatives Designated as Hedging Instruments [Member] | Forward Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Derivative contracts maturity date   2019-01  
Maximum [Member] | Derivatives Designated as Non-Hedging Instruments [Member] | Forward Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Derivative contracts maturity date   2017-11