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