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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 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
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 43.20% 44.00%
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 26.40% 27.70%
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 5.90% 5.80%
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 5.30% 4.70%
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 9.30% 8.90%
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 9.00% 8.20%
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 0.90% 0.70%
Defined Benefit Plan, Target Plan Asset Allocations 0.00%  
Other 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%  
Other Benefits [Member] | Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 8.40% 8.80%
Defined Benefit Plan, Target Plan Asset Allocations 8.00%  
Other Benefits [Member] | Fixed Income Investments [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 78.30% 78.20%
Defined Benefit Plan, Target Plan Asset Allocations 80.10%  
Other Benefits [Member] | Hedge Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 4.40% 4.50%
Defined Benefit Plan, Target Plan Asset Allocations 4.20%  
Other Benefits [Member] | Private Equity Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 1.70% 2.20%
Defined Benefit Plan, Target Plan Asset Allocations 2.60%  
Other Benefits [Member] | Structured Finance [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 2.70% 2.30%
Defined Benefit Plan, Target Plan Asset Allocations 2.10%  
Other Benefits [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 4.40% 4.00%
Defined Benefit Plan, Target Plan Asset Allocations 3.00%  
Other Benefits [Member] | Cash [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Weighted-average asset allocation 0.10% 0.00%
Defined Benefit Plan, Target Plan Asset Allocations 0.00%