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Investments - Summarized Interest (Details) $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Nov. 25, 2020 MW | Dec. 31, 2019 CAD ($)
--- | --- | --- | --- | ---
Disclosure of subsidiaries [line items] |  |  |  |
Assets | $ 9,226 | $ 9,747 |  |
Non-controlling interests | 1,011 | 1,084 |  |
Skookumchuck |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 136.8 |
SP Skookumchuck Investment, LLC |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Investments in associates accounted for using equity method | $ 93 | $ 85 |  | $ 0

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