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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information

21. Supplemental Cash Flow Information

 

     Year Ended December 31,  
     2013      2012      2011  
     (in millions)  

Interest paid on outstanding debt

    $ 171      $ 198      $ 238  

Income tax payments

      245        332        273  

Income tax refunds

      23        22        18