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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)

v3.8.0.1
PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets) (Details)
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 100.00% 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00% Ìý
Pension Benefits [Member] | Equity Securities [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 43.60% 43.20%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 45.00% Ìý
Pension Benefits [Member] | Fixed Income Investments [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 27.00% 26.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 28.00% Ìý
Pension Benefits [Member] | Hedge Funds [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 5.00% 5.90%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 5.00% Ìý
Pension Benefits [Member] | Private Equity Funds [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 5.30% 5.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 7.00% Ìý
Pension Benefits [Member] | Structured Finance [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 9.70% 9.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 7.50% Ìý
Pension Benefits [Member] | Real Estate [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 8.70% 9.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 7.50% Ìý
Pension Benefits [Member] | Cash [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 0.70% 0.90%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00% Ìý
Other Benefits [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 100.00% 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00% Ìý
Other Benefits [Member] | Equity Securities [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 8.70% 8.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 8.00% Ìý
Other Benefits [Member] | Fixed Income Investments [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 77.70% 78.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 80.00% Ìý
Other Benefits [Member] | Hedge Funds [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 4.40% 4.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 4.00% Ìý
Other Benefits [Member] | Private Equity Funds [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 1.50% 1.70%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 3.00% Ìý
Other Benefits [Member] | Structured Finance [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 3.00% 2.70%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 2.00% Ìý
Other Benefits [Member] | Real Estate [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 4.60% 4.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 3.00% Ìý
Other Benefits [Member] | Cash [Member] Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý
Weighted-average asset allocation 0.10% 0.10%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00% Ìý