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Description of Business and Segmented Disclosures - Schedule of Geographical Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]      
Revenue $ 66,897 $ 46,357 [1] $ 13,543 [1]
Non-Current Assets 42,447 40,968  
Assets held for sale, included in total assets, divested 1,300    
Canada      
Disclosure of geographical areas [line items]      
Revenue 33,222 23,768 8,715
Non-Current Assets 35,194 33,981  
Assets held for sale, included in total assets, divested 1,300    
United States      
Disclosure of geographical areas [line items]      
Revenue 32,313 21,326 4,828
Non-Current Assets 4,824 4,093  
China      
Disclosure of geographical areas [line items]      
Revenue 1,362 1,263 $ 0
Non-Current Assets 2,064 2,583  
Indonesia      
Disclosure of geographical areas [line items]      
Non-Current Assets $ 365 $ 311  
[1] See Note 3X for revisions to prior period results.