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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 9 Months Ended
Nov. 28, 2017
Oct. 28, 2017
Oct. 29, 2016
Retained Earnings Adjustments [Line Items]      
Shares repurchased (in shares)   4.6  
Repurchase of common stock, amount   $ 206 $ 93
Remaining share repurchase capacity   414  
Subsequent Event [Member]      
Retained Earnings Adjustments [Line Items]      
Quarterly dividend declared and paid in subsequent quarter $ 0.37    
2017 Program [Member]      
Retained Earnings Adjustments [Line Items]      
Share repurchase authorization   500  
2015 Program [Member]      
Retained Earnings Adjustments [Line Items]      
Expiration of unused share repurchase program capacity   $ 409