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PROPERTY AND EQUIPMENT - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Rental expense $ 63 $ 60 $ 63
2017 44    
2018 35    
2019 25    
2020 19    
2021 16    
2022 and beyond $ 50