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Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2015
Aug. 02, 2014
Aug. 01, 2015
Aug. 02, 2014
Disclosure Share Repurchase Activity [Abstract]        
Number of shares repurchased 10.0 9.0 15.6 14.6
Total cost $ 377 $ 364 $ 607 $ 583
Average per share cost including commissions (in dollars per share) $ 37.60 $ 40.61 $ 38.82 $ 40.09