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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Financial Instruments (Tables) [Abstract] 
Carrying amounts and estimated fair values of the Company's financial instruments
                                 
    September 30, 2011   December 31, 2010
    Carrying
 		  Estimated
 		  Carrying
 		  Estimated
    Amount   Fair Value   Amount   Fair Value
    (in millions)
 
Senior notes
  $   2,441     $   2,543     $   1,794     $   1,810  
Senior subordinated notes
    996       1,020       1,645       1,691  
CODES
    689       654       698       701  
Foreign currency forward contracts(1)
    —       —       17       17  
 
 
(1) See Note 16 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.