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Share Repurchases - Additional Information (Details) - USD ($)
$ in Millions
Aug. 01, 2015
Feb. 26, 2015
Jan. 31, 2015
Aug. 02, 2014
Disclosure Share Repurchases Additional Information [Abstract]        
Stock Repurchase Program, Authorized Amount   $ 2,500    
Share repurchases, remaining amount $ 695      
Stock Repurchase Program Amount Not Paid $ 0   $ 15 $ 5