XML 89 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
PROPERTY AND EQUIPMENT - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Rental expense $ 66 $ 63 $ 60
2018 50    
2019 39    
2020 32    
2021 25    
2022 20    
2023 and beyond $ 91