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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
Jul. 27, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  | $ 276 | $ 71
Dividends paid (in CAD per share) |  | $ 0.1400 | $ 0.0350
Common shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  | $ 276 | $ 71
Preference shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  | $ 17 | $ 17
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners | $ 9 |  |
Potential ordinary share transactions | Common shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share | $ 0.105 |  |

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