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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure |  |
Fair value of plan assets, net of net payables | $ 1,196 | $ 1,844
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 38 | 42
Government securities |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 65 | 63
Corporate bonds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 39 | 94
Equity securities |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 138 | 311
Other |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 55 | 81
Net payables |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 3 | 3
Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 335 | 591
Level 1 |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 241 | 416
Fair value of plan assets, net of net payables | 241 | 416
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 38 | 42
Level 1 | Government securities |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 65 | 63
Level 1 | Corporate bonds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Level 1 | Equity securities |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 138 | 311
Level 1 | Other |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Level 2 |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 94 | 175
Fair value of plan assets, net of net payables | 94 | 175
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Level 2 | 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 | 39 | 94
Level 2 | Equity securities |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Level 2 | Other |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 55 | 81
Level 3 |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Fair value of plan assets, net of net payables | 0 | 0
Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0 | 0
Level 3 | 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 | Equity securities |  |
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
Investments measured at net asset value |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | $ 861 | $ 1,253

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