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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%

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