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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, 2022 | Dec. 31, 2021
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | $ 58,869 |
Balance, end of year | $ 56,379 | $ 58,869
Common shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | 1,943 | 1,940
Repurchased for cancellation | (79) |
Issued on exercise of stock options and deferred share units | 1 | 3
Balance, end of year | 1,865 | 1,943
Balance, beginning of year | $ 23,093 | $ 23,042
Repurchased for cancellation | (938) |
Issued on exercise of stock options and deferred share units | 23 | 51
Balance, end of year | $ 22,178 | $ 23,093

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