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Remuneration of Directors and Senior Management (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Non-management directors      
Disclosure of transactions between related parties [line items]      
Fees earned and salary $ 2 $ 2 $ 2
Senior management      
Disclosure of transactions between related parties [line items]      
Fees earned and salary 2 2 2
Common stock option based awards 10 9 8
Annual incentive plans 6 4 6
Long-term incentive plans 19 14 20
Total $ 37 $ 29 $ 36