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BENEFIT PLANS (Asset Allocation Ranges and Actual Allocation, CRIP) (Details) - Other Benefits - Canada | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Canadian Equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual | 35.20% | 34.70%
International Equities (including U.S. Equities) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual | 14.90% | 14.90%
Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual | 49.10% | 49.10%
Money Market |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual | 0.80% | 1.30%
Minimum | Canadian Equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 25.00% |
Minimum | International Equities (including U.S. Equities) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 0.00% |
Minimum | Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 40.00% |
Minimum | Money Market |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 0.00% |
Maximum | Canadian Equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 50.00% |
Maximum | International Equities (including U.S. Equities) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 19.00% |
Maximum | Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 60.00% |
Maximum | Money Market |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Range | 10.00% |

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