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Other Income (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
OTHER INCOME. |  |
Unrealized gains (losses) recognized in earnings | $ 129 | $ (37)
Gains (losses) on inventory valuation | 13 | (39)
Risk management activities | 126 | (19)
Investment and interest income | 34 | 162
Insurance proceeds | 120 | 76
Change in value of pipeline commitments and other | 22 | (18)
Other income | $ 444 | $ 125

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