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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
--- | --- | --- | ---
Nov. 01, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Total dividends paid on preferred shares |  | $ 9 | $ 9 | $ 27 | $ 26
Stock Options With Associated Net Settlement Rights |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Instruments excluded from calculation, shares (in shares) |  | 1.5 | 2.0 | 1.5 | 2.0
Common shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Instruments excluded from calculation |  | $ 6 |  |  | $ 35
Instruments excluded from calculation, shares (in shares) |  | 0.6 |  |  | 1.6
Variable dividends declared ( in CAD per share) |  |  |  | $ 0 | $ 0
Preference shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Total dividends paid on preferred shares |  | $ 0 | $ 9 | $ 27 | $ 26
Potential ordinary share transactions | Common shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Dividends declared (in CAD per share) | $ 0.140 |  |  |  |
Potential ordinary share transactions | Preference shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Dividends declared | $ 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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