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