Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Asset Allocation Ranges and Actual Allocation, USRIP)) (Details)

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BENEFIT PLANS (Asset Allocation Ranges and Actual Allocation, USRIP)) (Details) - Other Benefits - U.S.
Dec. 31, 2017
Dec. 31, 2016
Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 24.70% 27.30%
Small- and Mid-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 7.60% 6.70%
International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 15.60% 12.30%
Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 4.70% 7.20%
Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Actual 6.80% 7.20%
Real Assets    
Defined Benefit Plan Disclosure [Line Items]    
Actual 3.70% 4.10%
Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Actual 35.10% 32.30%
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Actual 1.80% 2.90%
Minimum | Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 15.00% 15.00%
Minimum | Small- and Mid-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 0.00% 0.00%
Minimum | International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 10.00% 10.00%
Minimum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 2.00% 2.00%
Minimum | Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Range 0.00% 0.00%
Minimum | Real Assets    
Defined Benefit Plan Disclosure [Line Items]    
Range 2.00% 2.00%
Minimum | Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Range 20.00% 20.00%
Minimum | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Range 0.00% 0.00%
Maximum | Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 40.00% 40.00%
Maximum | Small- and Mid-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 15.00% 15.00%
Maximum | International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 30.00% 30.00%
Maximum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 10.00% 10.00%
Maximum | Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Range 10.00% 10.00%
Maximum | Real Assets    
Defined Benefit Plan Disclosure [Line Items]    
Range 10.00% 10.00%
Maximum | Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Range 55.00% 55.00%
Maximum | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Range 15.00% 15.00%