Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets) (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 100.00% 100.00%
Defined Benefit Plan, Target Plan Asset Allocations 100.00%  
Pension Benefits [Member] | Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 44.00% 45.60%
Defined Benefit Plan, Target Plan Asset Allocations 45.00%  
Pension Benefits [Member] | Fixed Income Investments [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 27.70% 28.70%
Defined Benefit Plan, Target Plan Asset Allocations 28.00%  
Pension Benefits [Member] | Hedge Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 5.80% 5.50%
Defined Benefit Plan, Target Plan Asset Allocations 5.00%  
Pension Benefits [Member] | Private Equity Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 4.70% 4.20%
Defined Benefit Plan, Target Plan Asset Allocations 7.00%  
Pension Benefits [Member] | Structured Finance [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 8.90% 8.70%
Defined Benefit Plan, Target Plan Asset Allocations 7.50%  
Pension Benefits [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 8.20% 6.70%
Defined Benefit Plan, Target Plan Asset Allocations 7.50%  
Pension Benefits [Member] | Cash [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 0.70% 0.60%
Defined Benefit Plan, Target Plan Asset Allocations 0.00%  
Veba Trust [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 100.00% 100.00%
Defined Benefit Plan, Target Plan Asset Allocations 100.00%  
Veba Trust [Member] | Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 8.80% 8.60%
Defined Benefit Plan, Target Plan Asset Allocations 8.00%  
Veba Trust [Member] | Fixed Income Investments [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 78.20% 79.30%
Defined Benefit Plan, Target Plan Asset Allocations 80.10%  
Veba Trust [Member] | Hedge Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 4.50% 4.30%
Defined Benefit Plan, Target Plan Asset Allocations 4.20%  
Veba Trust [Member] | Private Equity Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 2.20% 2.30%
Defined Benefit Plan, Target Plan Asset Allocations 2.60%  
Veba Trust [Member] | Structured Finance [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 2.30% 2.30%
Defined Benefit Plan, Target Plan Asset Allocations 2.10%  
Veba Trust [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 4.00% 3.20%
Defined Benefit Plan, Target Plan Asset Allocations 3.00%  
Veba Trust [Member] | Cash [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 0.00% 0.00%
Defined Benefit Plan, Target Plan Asset Allocations 0.00%