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Discontinued Operations - Additional Information (Detail) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 05, 2018 | Dec. 31, 2018
Disclosure Of Discontinued Operations [Line Items] |  |
Net Earnings (Loss) From Discontinued Operations |  | $ 247
Suffield Divestiture [Member] |  |
Disclosure Of Discontinued Operations [Line Items] |  |
Cash proceeds from sale of assets | $ 512 |
Gain (Loss) before tax on sale of assets | $ 343 |
Conventional [Member] |  |
Disclosure Of Discontinued Operations [Line Items] |  |
Net Earnings (Loss) From Discontinued Operations |  | 247
Cash flows from (used in) operating activities, discontinued operations |  | 36
Cash flows from (used in) investing activities, discontinued operations |  | $ 404

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