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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%

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