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Other Assets - Schedule of Other Assets (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 08, 2022
Jun. 30, 2022
Jun. 30, 2021
 [1]
Jun. 30, 2022
Jun. 30, 2021
 [1]
Dec. 31, 2021
Disclosure of classes of share capital [Line Items]            
Intangible Assets   $ 73   $ 73   $ 78
Private Equity Investments   53   53   53
Other Equity Investments   0   0   77
Net Investment in Finance Leases   63   63   60
Long-Term Receivables and Prepaids   53   53   77
Precious Metals   79   79   85
Other   2   2   1
Other assets   323   323   $ 431
Before-tax gain on disposal   $ 62 $ 60 $ 304 $ 72  
Headwater Exploration Inc.            
Disclosure of classes of share capital [Line Items]            
Proceeds from disposal of oil and gas assets $ 110          
[1] See Note 3 for revisions to prior period results.