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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Target allocation of plan assets (as a percent) | 35.00% |  |
Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Target allocation of plan assets (as a percent) | 65.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 338 | $ 403 | $ 386
Pension Benefits | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 17 | 12 |
Pension Benefits | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 66 | 83 |
Pension Benefits | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 9 | 20 |
Pension Benefits | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 31 | 19 |
Pension Benefits | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 48 | 59 |
Pension Benefits | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 141 | 188 |
Pension Benefits | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 31 | 30 |
Pension Benefits | Total pension plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 343 | 411 |
Pension Benefits | Net Payables |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 6 | 8 |
Pension Benefits | Level 1 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 17 | 12 |
Pension Benefits | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 31 | 19 |
Pension Benefits | Level 1 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 48 | 59 |
Pension Benefits | Level 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 141 | 188 |
Pension Benefits | Level 1 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | Total pension plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 237 | 278 |
Pension Benefits | Level 2 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 66 | 83 |
Pension Benefits | Level 2 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 9 | 20 |
Pension Benefits | Level 2 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 2 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 31 | 30 |
Pension Benefits | Level 2 | Total pension plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 106 | 133 |
Pension Benefits | Level 3 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Total pension plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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