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Equity Capital and Earnings Per Share - Summary of Changes in Issued and Outstanding Shares - Common Shares (Detail) - CAD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | $ 48,226 |
Balance, end of year | $ 48,727 | $ 48,226
Common shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | 1,865 | 1,943
Repurchased for cancellation | (63) | (79)
Issued on exercise of stock options and deferred share units | 4 | 1
Balance, end of year | 1,806 | 1,865
Balance, beginning of year | $ 22,178 | $ 23,093
Repurchased for cancellation | (745) | (938)
Issued on exercise of stock options and deferred share units | 94 | 23
Balance, end of year | $ 21,527 | $ 22,178

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