PENSION AND POST-RETIREMENT BENEFITS - Weighted Average Risk Target Ranges Per Asset Class (Details)	Dec. 31, 2018
United States | Minimum | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
United States | Minimum | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	20.00%
United States | Minimum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target ranges	10.00%
United States | Minimum | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	30.00%
United States | Minimum | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	5.00%
United States | Minimum | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
United States | Maximum | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target ranges	10.00%
United States | Maximum | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	30.00%
United States | Maximum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target ranges	20.00%
United States | Maximum | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	50.00%
United States | Maximum | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	15.00%
United States | Maximum | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target ranges	10.00%
International Plans | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
International Plans | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
International Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
International Plans | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	100.00%
International Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%
International Plans | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target ranges	0.00%