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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - U.S. Tax Reform (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |
Charge recognized in connection with the enactment of the Tax Act |  | $ 55 |  |  |
U.S. federal statutory tax rate (as a percent) | 21.00% | 28.10% | 35.00% | 35.00% | 35.00%

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