Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
BENEFIT PLANS - Asset Allocation Ranges and Actual Allocation, USRIP) (Details) - Other Benefits - U.S.
Dec. 31, 2018
Dec. 31, 2017
Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 13.20% 24.70%
Small- and Mid-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 3.70% 7.60%
International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 13.80% 15.60%
Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 3.80% 4.70%
Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Actual 7.00% 6.80%
Real Assets    
Defined Benefit Plan Disclosure [Line Items]    
Actual 4.10% 3.70%
Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Actual 53.20% 35.10%
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Actual 1.20% 1.80%
Minimum | Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 5.00% 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 5.00% 10.00%
Minimum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 0.00% 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 0.00% 2.00%
Minimum | Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Range 35.00% 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 20.00% 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 20.00% 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 65.00% 55.00%
Maximum | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Range 15.00% 15.00%