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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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- Definition

Line items represent concepts of discontinued operations.

+ References

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- Definition

The cash flows from (used in) the entity's investing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) investing activities]

+ References

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The cash flows from (used in) the entity's operating activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) operating activities]

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The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]]

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The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale]

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The profit (loss) from discontinued operations. [Refer: Discontinued operations [member]; Profit (loss)]

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