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Employee Stock Plans (Deferred Compensation Arrangements) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Deferred Compensation, Share-based Payments [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 16 $ 16 $ 15