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Significant accounting policies - Adoption of New or Amended Accounting Standards (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Other current assets |  | $ (324) | $ (253) |
Cash |  | 99 | 289 | $ 224
Capital expenditures |  | (5,133) | (4,852) |
Other financing activities |  | (31) | 19 |
Government Of Québec |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Increase in deficit | $ (97) |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |
Other current assets |  |  | $ 82 |
Cash |  | 82 |  |
Capital expenditures |  | (15) |  |
Other financing activities |  | $ 97 |  |

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- Definition The cash inflow from government grants, classified as investing activities. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2022-03-24 -Paragraph 28 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=20&code=ifrs-tx-2022-en-r&anchor=para_28&doctype=Standard -URIDate 2022-03-24 + Details
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