Investments in Joint Venture - Schedule of Disclosure of Information on Associates and Joint Ventures (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Joint Ventures And Associates [Line Items]
Beginning balance	$ 1,116
Share of profit	3	$ 2
Ending balance	1,223	1,116
NuevaUnión
Disclosure Of Joint Ventures And Associates [Line Items]
Beginning balance	1,116	1,139
Contributions	5	2
Changes in foreign exchange rates	99	(27)
Share of profit	3	2
Ending balance	$ 1,223	$ 1,116

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]]

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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[Line Items] for Disclosure Of Joint Ventures And Associates [Table]

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