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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 1,639 | $ 338 | $ 403
U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 13 | 17 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 60 | 66 |
Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 9 |
Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 46 | 31 |
Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 48 |
International funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 68 |  |
Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 173 | 141 |
Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 29 | 31 |
Net Payables |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 3 | 5 |
Total pensions plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1,642 | 343 |
Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 389 |  |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 300 |  |
Level 1 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 13 | 17 |
Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0 |
Level 1 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 46 | 31 |
Level 1 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 48 |
Level 1 | International funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 68 |  |
Level 1 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 173 | 141 |
Level 1 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Total pensions plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 300 | 237 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 89 |  |
Level 2 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 60 | 66 |
Level 2 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 9 |
Level 2 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0 |
Level 2 | International funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 |  |
Level 2 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 29 | 31 |
Level 2 | Total pensions plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 89 | 106 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 |  |
Level 3 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0 |
Level 3 | Bond funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Blend funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0 |
Level 3 | International funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 |  |
Level 3 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Total pensions plan assets |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | $ 0 |
Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 1,253 |  |

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