PENSIONS AND OTHER BENEFITS - Rate of increase in future compensation levels (Details)	Dec. 31, 2013	Dec. 31, 2012
Age 25
Rate of increase in future compensation levels	4.75%	4.75%
Age 35
Rate of increase in future compensation levels	4.25%	4.25%
Age 45
Rate of increase in future compensation levels	3.75%	3.75%
Age 55
Rate of increase in future compensation levels	3.25%	3.25%
Age 65
Rate of increase in future compensation levels	3.00%	3.00%