Investments in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Joint Ventures And Associates [Line Items]
Beginning balance	$ 1,060	$ 1,067
Contributions	4	5
Changes in foreign exchange rates	73	(5)
Share of loss (income)	4	(3)
Disposal of investment in associate	(1)
Other	(1)	(4)
Ending balance	1,139	1,060
NuevaUnión
Disclosure Of Joint Ventures And Associates [Line Items]
Beginning balance	1,059	1,061
Contributions	4	5
Changes in foreign exchange rates	73	(4)
Share of loss (income)	4	(3)
Disposal of investment in associate	0
Other	(1)	0
Ending balance	1,139	1,059
Other \| Other
Disclosure Of Joint Ventures And Associates [Line Items]
Beginning balance	1	6
Contributions	0	0
Changes in foreign exchange rates	0	(1)
Share of loss (income)	0	0
Disposal of investment in associate	(1)
Other	0	(4)
Ending balance	$ 0	$ 1

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: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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