Financial Instruments (Fair Value Derivative Contracts on Gross Basis by Type of Contract) (Details) - Forward Foreign Exchange Contracts [Member] - Derivatives Designated as Hedging Instruments [Member] - USD ($) $ in Millions	Apr. 29, 2017	Jan. 28, 2017	Apr. 30, 2016
Current Assets [Member]
Derivative [Line Items]
Fair value of derivative hedging assets	$ 1	$ 3	$ 3
Current Liabilities [Member]
Derivative [Line Items]
Fair value of derivative hedging liability	$ 3	$ 3
Non-current Liabilities [Member]
Derivative [Line Items]
Fair value of derivative hedging liability			$ 1