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Investments - Future payments under contractual commitments (Details)
$ in Millions
Dec. 31, 2020
CAD ($)
Disclosure of subsidiaries [line items]  
Long-term service agreements $ 173
SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 33
2021  
Disclosure of subsidiaries [line items]  
Long-term service agreements 31
2021 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 1
2022  
Disclosure of subsidiaries [line items]  
Long-term service agreements 37
2022 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 1
2023  
Disclosure of subsidiaries [line items]  
Long-term service agreements 22
2023 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 1
2024  
Disclosure of subsidiaries [line items]  
Long-term service agreements 18
2024 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 1
2025  
Disclosure of subsidiaries [line items]  
Long-term service agreements 10
2025 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements 1
2026  
Disclosure of subsidiaries [line items]  
Long-term service agreements 55
2026 | SP Skookumchuck Investment, LLC  
Disclosure of subsidiaries [line items]  
Long-term service agreements $ 28