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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Minimum Rental Commitments

As of December 31, 2015, minimum rental commitments under non-cancelable operating leases in effect at year-end were (in millions):

 

                                                                                                                 
2016      2017      2018      2019      2020      Thereafter      Total  
$             311       $ 202       $ 145       $ 111       $ 98       $ 127       $ 994