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Description of Business and Segmented Disclosures - Schedule of Geographical Information (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Disclosure of geographical areas [line items]          
Revenues [1] $ 13,195 $ 13,819 $ 38,813 $ 41,464  
Non-Current Assets 41,663   41,663   $ 44,452
Canada          
Disclosure of geographical areas [line items]          
Revenues 5,787 6,937 17,359 20,235  
Non-Current Assets 37,889   37,889   37,006
United States          
Disclosure of geographical areas [line items]          
Revenues 7,176 6,606 20,697 20,366  
Non-Current Assets 2,538   2,538   5,902
China          
Disclosure of geographical areas [line items]          
Revenues 232 $ 276 757 $ 863  
Non-Current Assets 1,006   1,006   1,249
Indonesia          
Disclosure of geographical areas [line items]          
Non-Current Assets $ 230   $ 230   $ 295
[1] Comparative periods reflect certain revisions. See Note 23.