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)

v3.7.0.1
Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jan. 28, 2017
Jan. 30, 2016
Marketable equity and debt securities $ 112 $ 132
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Marketable equity and debt securities 20 13
Significant Observable Inputs (Level 2) [Member]    
Marketable equity and debt securities 92 119
Significant Unobservable Inputs (Level 3) [Member]    
Marketable equity and debt securities $ 0 $ 0