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, 2019
Dec. 31, 2018
Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 7.40% 13.20%
Small- and Mid-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 4.10% 3.70%
International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 12.70% 13.80%
Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Actual 2.30% 3.80%
Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Actual 6.60% 7.00%
Real Assets    
Defined Benefit Plan Disclosure [Line Items]    
Actual 3.40% 4.10%
Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Actual 61.80% 53.20%
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Actual 1.70% 1.20%
Minimum | Large-Cap Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 5.00% 5.00%
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% 5.00%
Minimum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Range 0.00% 0.00%
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% 0.00%
Minimum | Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Range 35.00% 35.00%
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% 20.00%
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% 20.00%
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% 65.00%
Maximum | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Range 15.00% 15.00%