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)

v3.6.0.2
PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets) (Details)
 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%