PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Healthcare Rate Trends (Details)	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation, healthcare cost trend rate Assumed, Next Fiscal Year	6.50%
Benefit obligation, healthcare cost trend rate	4.50%
Net periodic benefit cost, healthcare cost trend rate	4.50%
Prescription drug cost trend rate assumed, next fiscal year	9.00%
Benefit obligation, prescription drug cost ultimate trend rate	4.50%
Net periodic benefit cost, prescription drug cost trend rate assumed, next fiscal year	10.10%
Net periodic benefit cost, prescription drug cost ultimate trend rate	4.50%
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost, health care cost trend rate assumed, next fiscal year	5.60%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost, health care cost trend rate assumed, next fiscal year	7.20%