RETIREMENT PLANS - Allocation Plan Assets (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension | International
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	100.00%	100.00%
Pension | International | Cash
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	1.00%	1.00%
Pension | International | International equity
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	45.00%	45.00%
Pension | International | Corporate bonds
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	18.00%	19.00%
Pension | International | Government bonds
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	20.00%	19.00%
Pension | International | Total fixed income
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	38.00%	38.00%
Pension | International | Insurance company accounts
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	15.00%	15.00%
Pension | International | Real estate
Asset allocation percentages
PERCENTAGE OF PLAN ASSETS	1.00%	1.00%
Pension and Postretirement Health Care Benefit Plans | U.S.
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	100.00%	100.00%
PERCENTAGE OF PLAN ASSETS	100.00%	100.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Cash
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	0.00%
PERCENTAGE OF PLAN ASSETS	0.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Large cap equity
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	34.00%	34.00%
PERCENTAGE OF PLAN ASSETS	34.00%	39.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Small cap equity
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	9.00%	9.00%
PERCENTAGE OF PLAN ASSETS	9.00%	9.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | International equity
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	15.00%	15.00%
PERCENTAGE OF PLAN ASSETS	14.00%	15.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Core fixed income
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	18.00%	18.00%
PERCENTAGE OF PLAN ASSETS	19.00%	18.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | High-yield bonds
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	5.00%	5.00%
PERCENTAGE OF PLAN ASSETS	5.00%	5.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Emerging markets
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	2.00%	2.00%
PERCENTAGE OF PLAN ASSETS	2.00%	2.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Real estate
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	6.00%	6.00%
PERCENTAGE OF PLAN ASSETS	8.00%	7.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Private Equity
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	8.00%	8.00%
PERCENTAGE OF PLAN ASSETS	7.00%	5.00%
Pension and Postretirement Health Care Benefit Plans | U.S. | Distressed debt
Asset allocation percentages
TARGET ASSET ALLOCATION PERCENTAGE	3.00%	3.00%
PERCENTAGE OF PLAN ASSETS	2.00%