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Debt And Other Obligations (Schedule Of Information Related To Equity And Debt Components) (Details) (6.00% Convertible Senior Notes Due 2015 [Member], USD $)
Dec. 31, 2011
Dec. 25, 2010
Mar. 28, 2009
Apr. 27, 2007
6.00% Convertible Senior Notes Due 2015 [Member]
       
Debt And Other Obligations [Line Items]        
Carrying amount of the equity component $ 162,000,000 $ 171,000,000 $ 259,000,000  
Principal amount of the 6.00% Notes 580,000,000 780,000,000   2,200,000,000
Unamortized discount (34,000,000) (57,000,000)    
Net carrying amount $ 546,000,000 $ 723,000,000