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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 30, 2024 | Oct. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Total dividends paid on preferred shares |  |  |  |  | $ 27 | $ 27
Common shares |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Instruments excluded from calculation |  |  | $ 0 | $ 115 | $ 20 | $ 107
Instruments excluded from calculation, shares (in shares) |  |  | 3.0 | 22.8 | 11.5 | 21.6
Variable dividends declared ( in CAD per share) |  |  |  |  | $ 0.135 | $ 0
Potential ordinary share transactions | Common shares |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Dividends declared (in CAD per share) | $ 0.180 |  |  |  |  |
Potential ordinary share transactions | Preferred Shares |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Total dividends paid on preferred shares |  |  |  |  | $ 27 | $ 27
Dividends declared | $ 9 | $ 9 |  |  |  |

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- Definition Instruments With Potential Future Dilutive Effect Not Included In Calculation Of Diluted Earnings Per Share, Value + References No definition available. + Details
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- Definition The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2024-01-01 -Paragraph 13 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=10&code=ifrs-tx-2024-en-r&anchor=para_13&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 137 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_137_a&doctype=Standard -URIDate 2024-03-27 + Details
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