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Pension Plans and Other Post-Retirement Benefits - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
plan
Year
Dec. 31, 2019
CAD ($)
Disclosure of defined benefit plans [line items]    
Number of small defined benefit plans in the Philippines open to new members | plan 1  
Age requirement | Year 50  
Requisite service period 10 years  
Equity investments 3.00% 3.00%
Post-employment benefit expense, defined contribution plans | $ $ 144 $ 131
Fixed income investments | Level 1    
Disclosure of defined benefit plans [line items]    
Equity investments 2.00% 3.00%