Financial Instruments and Risk Management (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	Jan. 28, 2017	Jan. 30, 2016
Current Assets [Member]
Derivative [Line Items]
Fair value of derivative hedging assets	$ 3	$ 3
Current Liabilities [Member]
Derivative [Line Items]
Fair value of derivative hedging liability	$ 3