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Preferred Stock (Narrative) (Details) - Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Preferred Stock [Line Items]      
Preferred stock, authorized (in shares) 3,000,000 3,000,000  
Preferred stock, dividends per share $ 5.46    
Preferred Stock, Shares Issued 803,953 803,953 800,000
Outstanding preferred shares, fair value $ 67 $ 70  
Preferred stock convertible at the option of the holder 4.9625    
Preferred stock call price $ 78    
Preferred shares, outstanding 135,053 145,453