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Financial Instruments And Risk Management - Non Designated Derivative Financial Instruments (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Fair value outstanding beginning balance | CAD 88,702.0 |
Fair value outstanding ending balance | 89,494.0 | CAD 88,702.0
At fair value |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Fair value outstanding beginning balance |  | 2.0
Unrealized losses recognized in earnings during the year (note 9) | (56.0) | (72.0)
Fair value outstanding beginning balance | (54.0) |
Cash Settlements paid during the year | 5.0 | 16.0
Fair value outstanding ending balance | (105.0) | (54.0)
Energy Trading | At fair value |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Cash Settlements - paid (received) during the year | (12.0) |
Unrealized losses recognized in earnings during the year (note 9) | (37.0) | (47.0)
Fair value outstanding beginning balance | (36.0) | (18.0)
Cash Settlements paid during the year |  | 29.0
Fair value outstanding ending balance | (85.0) | (36.0)
Risk Management | At fair value |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Fair value outstanding beginning balance |  | 20.0
Cash Settlements - paid (received) during the year |  | (13.0)
Unrealized losses recognized in earnings during the year (note 9) | (19.0) | (25.0)
Fair value outstanding beginning balance | (18.0) |
Cash Settlements paid during the year | 17.0 |
Fair value outstanding ending balance | CAD (20.0) | CAD (18.0)

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