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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2011
Financial Instruments [Abstract]  
Carrying amounts and estimated fair values of the Company's financial instruments
                                 
    December 31, 2011     December 31, 2010  
    Carrying
Amount		     Estimated
Fair  Value		     Carrying
Amount		     Estimated
Fair  Value		  
    (in millions)  

Senior Notes (1)

     2,938       2,940       1,794       1,810  

Senior Subordinated Notes (1)

     498       513       1,645       1,691  

CODES(1)

    689       658       698       701  

Foreign currency forward contracts ( 2 )

     1       1       17       17  

 

(1) 

The Company measures the fair value of its long-term debt using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.

 

(2 ) 

See Note 14 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.