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Financial Instruments
9 Months Ended
Sep. 30, 2011
Financial Instruments [Abstract] 
Financial Instruments
 
15.  Financial Instruments
 
At September 30, 2011 and December 31, 2010, the Company’s financial instruments consisted primarily of cash and cash equivalents, billed receivables, trade accounts payable, senior notes, senior subordinated notes, CODES and foreign currency forward contracts. The carrying amounts of cash and cash equivalents, billed receivables and trade accounts payable are representative of their respective fair values because of the short-term maturities or expected settlement dates of these instruments. The fair value of the senior notes, senior subordinated notes and CODES are based on quoted prices for these securities. The fair values of foreign currency forward contracts are based on forward exchange rates. The carrying amounts and estimated fair values of the Company’s financial instruments are presented in the table below.
 
                                 
    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.