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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 124 | $ 144 | $ 237 | $ 258 |
Effective income tax rate | 22.60% | 31.10% | 22.60% | 28.80% |
U.S. Federal income tax expense and tax rate |  |  | 21.00% | 35.00% |
Deferred taxes, net | $ 456 |  | $ 456 |  | $ 571

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