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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%

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