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Risk Management Activities - Interest Rate Risk (Details) - Interest rate risk - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Sensitivity analysis, Net earnings increase (decrease) | CAD 0 | CAD 0 | CAD 1,000
Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent | 0.15% | 0.15% | 0.15%
Sensitivity analysis, OCI gain | CAD 0 | CAD 0 | CAD 0

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