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Basis of presentation and significant accounting policies (Details) - CAD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Mar. 31, 2022 | Dec. 31, 2020
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Cash | $ 596,000,000 | $ 1,846,000,000 | $ 2,004,000,000 | $ 596,000,000 | $ 1,846,000,000 | $ 289,000,000 | $ 178,000,000 | $ 224,000,000
Other current assets | (226,000,000) |  |  | (226,000,000) |  | (253,000,000) |  |
Capital expenditures | (1,219,000,000) | (1,210,000,000) |  | (2,178,000,000) | (2,222,000,000) |  |  |
Other financing activities | $ 0 | (44,000,000) |  | $ (28,000,000) | 36,000,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | 82,000,000 |  |
Other current assets |  |  |  |  |  | 82,000,000 |  |
Capital expenditures |  | (3,000,000) |  |  | (3,000,000) | (15,000,000) |  |
Other financing activities |  | $ 0 |  |  | $ 97,000,000 | $ 97,000,000 |  |
Government Of Québec |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Reclassification of committed funding received |  |  | $ 97,000,000 |  |  |  |  |

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- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from government grants, classified as financing activities. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2021-01-01 -Paragraph 28 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2021-en-r&anchor=para_28&doctype=Standard -URIDate 2021-03-24 + Details
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