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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 403 | $ 386 | $ 384
Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Target allocation of plan assets (as a percent) | 65.00% |  |
Common and preferred stocks | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 188 | 178 |
Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Target allocation of plan assets (as a percent) | 35.00% |  |
Total pension plan assets | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 411 | 389 |
U.S. government securities | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 12 | 13 |
Corporate bonds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 83 | 85 |
Common/collective trusts | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 18 |
Bond funds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 19 | 18 |
Blend funds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 59 | 48 |
Other | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 30 | 29 |
Net Payables | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 8 | 3 |
Level 1 | Common and preferred stocks | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 188 | 178 |
Level 1 | Total pension plan assets | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 278 | 257 |
Level 1 | U.S. government securities | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 12 | 13 |
Level 1 | Bond funds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 19 | 18 |
Level 1 | Blend funds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 59 | 48 |
Level 2 | Total pension plan assets | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 133 | 132 |
Level 2 | Corporate bonds | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 83 | 85 |
Level 2 | Common/collective trusts | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 18 |
Level 2 | Other | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 30 | $ 29 |

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