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Description of Business and Segmented Disclosures - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Customer
Dec. 31, 2021
CAD ($)
Customer
Dec. 31, 2020
CAD ($)
Customer
Disclosure of operating segments [line items]      
Number of major customers | Customer 2 2 3
Gross Sales $ 71,765 $ 48,811 [1] $ 13,914 [1]
Customer One      
Disclosure of operating segments [line items]      
Gross Sales 16,100 8,500 4,300
Customer Two      
Disclosure of operating segments [line items]      
Gross Sales $ 9,100 $ 6,800 1,800
Customer Three      
Disclosure of operating segments [line items]      
Gross Sales     $ 1,500
Bottom of range      
Disclosure of operating segments [line items]      
Percentage of entity's revenues from gross sales 10.00%    
[1] See Note 3X for revisions to prior period results.