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Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 13, 2015
Jun. 13, 2015
Jun. 14, 2014
Repurchase Of Shares Of Common Stock [Line Items]      
Shares Repurchased   3,680 [1] 4,007
Dollar Value of Shares Repurchased   $ 295 [1] $ 300
Remaining dollar value of shares that may be repurchased $ 838 $ 838  
Value Of Share Repurchases Prior To Current Reporting Date But With Settlement Dates Subsequent To Current Reporting Date $ 8    
Share Repurchases Prior To Current Reporting Date But With Settlement Dates Subsequent To Current Reporting Date 100    
November 2012 [Member]      
Repurchase Of Shares Of Common Stock [Line Items]      
Shares Repurchased   0 2,737
Dollar Value of Shares Repurchased   $ 0 $ 203
Remaining dollar value of shares that may be repurchased $ 0 $ 0  
November 2013 [Member]      
Repurchase Of Shares Of Common Stock [Line Items]      
Shares Repurchased   1,779 1,270
Dollar Value of Shares Repurchased   $ 133 $ 97
Remaining dollar value of shares that may be repurchased 0 $ 0  
November 2014 [Member]      
Repurchase Of Shares Of Common Stock [Line Items]      
Shares Repurchased   1,901 0
Dollar Value of Shares Repurchased   $ 162 $ 0
Remaining dollar value of shares that may be repurchased $ 838 $ 838  
[1] Includes the effect of $8 million in share repurchases (0.1 million shares) with trade dates prior to June 13, 2015 but cash settlement dates subsequent to June 13, 2015.