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Equity Capital and Earnings Per Share - Changes in Common Shares Issued and Outstanding (Detail) - CAD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | $ 48,727 |
Balance, end of year | $ 52,960 | $ 48,727
Common shares |  |
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | 1,806 | 1,865
Repurchased for cancellation | (83) | (63)
Issued on exercise of stock options and deferred share units | 6 | 4
Balance, end of year | 1,729 | 1,806
Balance, beginning of year | $ 21,527 | $ 22,178
Repurchased for cancellation | (989) | (745)
Issued on exercise of stock options and deferred share units | 143 | 94
Balance, end of year | $ 20,681 | $ 21,527

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