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Employee Future Benefits - Contributions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
CAD ($)
Registered  
Disclosure of defined benefit plans [line items]  
Expected employer contributions $ 5
Supplemental Pension Plan  
Disclosure of defined benefit plans [line items]  
Expected employer contributions 5
Other  
Disclosure of defined benefit plans [line items]  
Expected employer contributions 2
Total  
Disclosure of defined benefit plans [line items]  
Expected employer contributions $ 12