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Income Taxes - Narrative (Details) - CAD ($) $ in Millions |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2022 | Jul. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Provincial corporate income tax rate | 8.00% | 8.00% | 10.00% | 11.00% | 12.00% |
Provincial corporate income tax rate, annual rate reduction |  |  |  | 1.00% |  |
Increase in deferred income tax liability due to change in provincial corporate income tax rate |  |  |  | $ 1,618 |  |
Unused tax losses |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  | $ 1,000
Unused tax credits |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  | $ 1,050

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