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Share Repurchase - Schedule of Share Repurchases (excluding ASR) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Apr. 30, 2016
May. 02, 2015
Equity [Abstract]    
Total number of shares purchased 11.4 3.7
Average price paid per share (in dollars per share) $ 78.37 $ 80.85
Total investment $ 893 $ 300