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Investments - Future payments under contractual commitments (Details)
$ in Millions
Dec. 31, 2021
CAD ($)
Disclosure of subsidiaries [line items]  
Long-term service agreements $ 289
2022  
Disclosure of subsidiaries [line items]  
Long-term service agreements 89
2023  
Disclosure of subsidiaries [line items]  
Long-term service agreements 46
2024  
Disclosure of subsidiaries [line items]  
Long-term service agreements 43
2025  
Disclosure of subsidiaries [line items]  
Long-term service agreements 32
2026  
Disclosure of subsidiaries [line items]  
Long-term service agreements 25
2027  
Disclosure of subsidiaries [line items]  
Long-term service agreements $ 54