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General and Administrative - Summary of General and Administrative Expenses (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
General And Administrative Expenses [Abstract]      
Salaries and Benefits $ 264 $ 145 $ 143
Administrative and Other 225 102 90
Stock-Based Compensation Expense (Recovery) (Note 32) 159 49 67
Other Incentive Benefits Expense (Recovery) 201 (4) 31
General and Administrative Expenses $ 849 $ 292 [1] $ 331 [1]
[1] See Note 3(w) for revisions to comparative results.