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Pensions and Other Post-Employment Benefits - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
CAD ($)
OPEB  
Disclosure of defined benefit plans [line items]  
Weighted average duration 14 years
Estimate of contributions expected to be paid to plan for next annual reporting period $ 8
Pension Benefits  
Disclosure of defined benefit plans [line items]  
Weighted average duration 16 years
Percentage of employees contribution under pension plan 4.00%
Employer contribution $ 11