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EMPLOYEE BENEFITS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | $ 12 |
U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 5 | $ 8
Non-U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 | 2
Municipal obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 | 1
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 99 | 102
Asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  |  | 1
Bank loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 17 | 0
Level 1 | Cash and money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 12 |
Level 1 | U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 5 | 0
Level 1 | Non-U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 1 | Municipal obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 1 | Asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  |  | 0
Level 1 | Bank loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 102 | 114
Level 2 | Cash and money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 |
Level 2 | U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 8
Level 2 | Non-U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 | 2
Level 2 | Municipal obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 | 1
Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 99 | 102
Level 2 | Asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  |  | 1
Level 2 | Bank loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 1 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Cash and money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 |
Level 3 | U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Non-U.S. government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Municipal obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  |  | 0
Level 3 | Bank loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 0 |
Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | 119 | 114
Investments Measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | [1] | 931 | 1,024
Investment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value |  | $ 1,050 | $ 1,138
[1] | Certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.

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