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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 14, 2016
Oct. 31, 2015
Jan. 30, 2016
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Share Repurchase Program [Line Items]            
Capacity ending balance     $ 811 $ 1,075 $ 670 $ 393
Dividends paid     $ 6.33 $ 1.32 $ 1.20  
Special cash dividend       $ 251 $ 234  
Subsequent Event [Member]            
Share Repurchase Program [Line Items]            
Quarterly dividend per share declared and paid in 2016 $ 0.37          
Special Dividend [Member]            
Share Repurchase Program [Line Items]            
Dividends paid     $ 4.85      
Special cash dividend     $ 905      
Recurring Dividend [Member]            
Share Repurchase Program [Line Items]            
Dividends paid   $ 0.37 $ 1.48      
Special cash dividend     $ 280      
2013 Program [Member]            
Share Repurchase Program [Line Items]            
Share repurchase authorization         $ 800  
Expiration of unused capacity in March 2015     73      
2014 Program [Member]            
Share Repurchase Program [Line Items]            
Share repurchase authorization       $ 1,000    
Capacity ending balance     0      
2015 Program [Member]            
Share Repurchase Program [Line Items]            
Share repurchase authorization     $ 1,000