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PENSION PLANS (Details) - Other post-employment benefit plans [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
Mortality chart RV-2014 RV-2014
Termination of contract rates 5.00% 5.00%
Impairment chart PDT 1985 PDT 1985