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INCOME TAXES - Tabular (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
INCOME TAXES        
Current income taxes $ 162 $ 89 $ 296 $ 196
Deferred income taxes (23) (24) (38) 10
Income tax expense $ 139 $ 65 $ 258 $ 206
Effective tax rate 81.30% (60.20%) 76.30% 185.60%