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General and Administrative - Summary of General and Administrative Expenses (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
General And Administrative Expenses [Abstract]        
Salaries and Benefits $ 70 $ 79 $ 142 $ 149
Administrative and Other 61 50 90 108
Stock-Based Compensation Expense (Recovery) (Note 25) 87 34 194 69
Other Incentive Benefits Expense (Recovery) 0 7 (9) 7
General and Administrative Expenses $ 218 $ 170 [1] $ 417 $ 333 [1]
[1] See Note 3 for revisions to prior period results.