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EMPLOYEE RETIREMENT PLANS - Assumptions - General Disclosures (Details) - Defined-benefit pension plans
12 Months Ended 120 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2008
Dec. 31, 2016
Assumptions          
Discount rate for obligations (as a percent) 3.30% 3.50% 4.00%   3.50%
Expected return on plan assets (as a percent) 7.25% 7.25% 7.25%    
Actual annual rate of return on pension plan assets (as a percent) 13.90% 8.30% (1.80%) (32.10%) 4.30%
Equity securities          
Assumptions          
Asset allocation (as a percent) 50.00%        
Debt securities          
Assumptions          
Asset allocation (as a percent) 30.00%        
Alternative investments          
Assumptions          
Asset allocation (as a percent) 20.00%        
Minimum          
Assumptions          
Discount rate for obligations (as a percent) 1.50% 1.50% 2.00%   1.50%
Liabilities having a discount rate for obligations (as a percent) 3.40% 3.80% 4.00%   3.80%
Maximum          
Assumptions          
Discount rate for obligations (as a percent) 3.60% 4.00% 4.30%   4.00%