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EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Liability, Defined Benefit Plan [Abstract] |  |
Accrued benefit liability-long term | $ 571 | $ 503
Qualified Defined Benefit [Member] |  |
Liability, Defined Benefit Plan [Abstract] |  |
Accrued benefit liability-long term | 412 | 392
Plan assets-long term (within Other noncurrent assets) | (49) | (25)
Total liability recognized | 363 | 367
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Prior service credit | (6) | (8)
Net loss | 595 | 607
Amount recognized in AOCL (pretax) | $ 589 | $ 599

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