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Description of Business and Segmented Disclosures - Schedule of Geographical Information (Detail) - CAD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Disclosure of geographical areas [line items]
Revenue	[1]	$ 54,277	$ 52,204
Non-current assets		44,452	43,058
Canada
Disclosure of geographical areas [line items]
Revenue		26,791	25,128
Non-current assets		37,006	35,876
United States
Disclosure of geographical areas [line items]
Revenue		26,333	25,943
Non-current assets		5,902	5,230
China
Disclosure of geographical areas [line items]
Revenue		1,153	1,133
Non-current assets		1,249	1,608
Indonesia
Disclosure of geographical areas [line items]
Non-current assets		$ 295	$ 344
[1] (1)Revised presentation as of January 1, 2024. See Note 4.

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The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Classes of financial instruments [domain]; Non-current assets]

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