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Interests in Other Entities - Financial Information of Joint Ventures and Associates (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interests In Other Entities [Abstract]
Carrying amount of interests in joint ventures and associates	$ 1,500	$ 1,369
Our share of:
Net income (loss)	91	67
Other comprehensive income (loss)	7	(31)
Total comprehensive income (loss)	$ 98	$ 36

X

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

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- Definition

Share of the other comprehensive income of associates and joint ventures accounted for using the equity method that will be reclassified to profit or loss, net of tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The entity's share of the total comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Joint ventures [member]; Investments accounted for using equity method]

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Interests In Other Entities [Abstract]

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