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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2013
Investments All Other Investments [Abstract]  
Carrying Amounts and Estimated Fair Values of Company's Long-Term Debt and Foreign Currency Forward Contracts

The carrying amounts and estimated fair values of the Company’s other financial instruments are presented in the table below.

 

     December 31, 2013      December 31, 2012  
     Carrying
Amount		      Estimated
Fair Value		      Carrying
Amount		      Estimated
Fair Value		  
     (in millions)  

Senior Notes(1)

    $ 2,941      $ 3,121      $ 2,940      $ 3,301  

CODES(1)

    $ 689      $ 830      $ 689      $ 697  

Foreign currency forward contracts(2)

    $ 1      $ 1      $ 5      $ 5  

 

(1)  The Company measures the fair value of its Senior Notes and CODES using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.
(2)  The Company measures the fair values of foreign currency forward contracts based on forward exchange rates. See Note 15 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.