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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%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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