EMPLOYEE BENEFITS - Assumptions Used in Determining the Net Periodic Benefit Cost of the Postretirement Benefits Plan (Details) - Postretirement Benefit Plan - USD ($) $ in Millions	3 Months Ended		4 Months Ended		5 Months Ended		12 Months Ended
	Aug. 31, 2014	[1]	Dec. 31, 2014	[1]	May. 31, 2014	[1]	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.875%		3.75%		4.625%		3.50%
Rate of compensation increase								0.00%
Ultimate rate							5.00%	5.00%
Effect on accumulated postretirement benefit obligation: One percent increase							$ 0	$ 0
Effect on accumulated postretirement benefit obligation: One percent decrease							$ 0	$ 0

[1] 4.625% for January 1 - May 31, 2014 period; 3.875% for June 1 - August 31, 2014 period; and, 3.750% for September 1 - December 31, 2014 period.