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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2012
Supplemental Cash Flow Information

21. Supplemental Cash Flow Information

 

    Year Ended December 31,  
    2012     2011     2010  
    (in millions)  

Interest paid on outstanding debt

  $ 198      $ 238      $ 233   

Income tax payments

    332        273        341   

Income tax refunds

    22        18        12