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Shareholders' Equity (Deficit) (Narrative) (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Aug. 01, 2015
May 02, 2015
June 2015 Repurchase Program [Member]      
Stock Repurchase Program, Authorized Amount   $ 250  
February 2016 Repurchase Program [Member]      
Stock Repurchase Program, Authorized Amount $ 500    
February 2015 Repurchase Program [Member] [Member]      
Stock Repurchase Program, Authorized Amount     $ 250