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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Mar. 20, 2017
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Feb. 01, 2014
Retained Earnings Adjustments [Line Items]          
Remaining share repurchase program capacity   $ 529 $ 811 $ 1,075 $ 670
Dividends paid (in dollars per share)   $ 1.48 $ 6.33 $ 1.32  
Dividends   $ 256   $ 251  
Special Dividend [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends paid (in dollars per share)     $ 4.85    
Dividends     $ 905    
Recurring Dividend [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends paid (in dollars per share)     $ 1.48    
Dividends     $ 280    
Retained Earnings [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends   256   $ 251  
Retained Earnings [Member] | Special Dividend [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends     905    
Retained Earnings [Member] | Recurring Dividend [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends     280    
Subsequent Event [Member]          
Retained Earnings Adjustments [Line Items]          
Quarterly dividend per share declared and paid subsequent quarter $ 0.37        
2015 Program [Member]          
Retained Earnings Adjustments [Line Items]          
Remaining share repurchase program capacity   $ 529      
Share repurchase authorization     $ 1,000    
2015 Program [Member] | Subsequent Event [Member]          
Retained Earnings Adjustments [Line Items]          
Expiration of unused capacity in March 2017 $ 409        
2017 Program [Member] | Subsequent Event [Member]          
Retained Earnings Adjustments [Line Items]          
Share repurchase authorization $ 500