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Income taxes - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Abstract] |  |  |
Applicable statutory tax rate | 26.80% | 26.90% |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax asset | $ (4,574) | $ (3,704) | $ (3,463)
Non-capital tax loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax loss carryforward | 266 | 357 |
Deferred tax asset | 63 | 69 | $ 31
Unused tax losses for which no deferred tax asset recognised | 17 | 94 |
Non-capital Loss Carryforwards With Deferred Tax Asset |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax loss carryforward | 249 | 263 |
Capital loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax loss carryforward | $ 69 | $ 64 |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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