Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details)

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Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jan. 30, 2016
Jan. 31, 2015
Marketable equity and debt securities $ 132 $ 97
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Marketable equity and debt securities 0 0
Significant Observable Inputs (Level 2) [Member]    
Marketable equity and debt securities 132 97
Significant Unobservable Inputs (Level 3) [Member]    
Marketable equity and debt securities $ 0 $ 0