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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Mar. 19, 2018
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Retained Earnings Adjustments [Line Items]          
Remaining share repurchase program capacity   $ 414 $ 529 $ 811 $ 1,075
Dividends paid (in dollars per share)   $ 1.48 $ 1.48 $ 6.33  
Dividends   $ 247      
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     $ 256 $ 280  
Retained Earnings [Member]          
Retained Earnings Adjustments [Line Items]          
Dividends   247 $ 256    
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]          
Expiration of unused capacity   409      
Share repurchase authorization       $ 1,000  
2017 Program [Member]          
Retained Earnings Adjustments [Line Items]          
Share repurchase authorization   $ 500