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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Minimum Rental Commitments

As of December 31, 2014, minimum rental commitments under non-cancelable operating leases in effect at year-end were (in millions):

 

                                                                                                                                    

Year ending:

   2015    2016    2017    2018    2019    Thereafter    Total
   $309    $227    $182    $129    $102    $131    $1,080