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EMPLOYEE BENEFITS - Plan Amounts Recognized in OCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Net periodic pension income | $ (16) | $ (2) | $ (1)
Net actuarial loss (gain) | 49 | (31) | 54
Amortization of prior service credit | 1 | 1 | 1
Amortization of net actuarial loss | (17) | (18) | (16)
Total recognized in other comprehensive income (loss) | 33 | (48) | 39
Total recognized in net periodic pension cost and other comprehensive income (loss) | $ 17 | $ (50) | $ 38

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