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PROPERTY AND EQUIPMENT - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PROPERTY AND EQUIPMENT      
Rental expense $ 60 $ 63 $ 59
2016 38    
2017 27    
2018 20    
2019 16    
2020 11    
2021 and beyond $ 65