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Share 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
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | $ 50,106 |
Balance, end of year | $ 53,006 | $ 50,106
Common shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | 1,949 | 1,971
Repurchased for cancellation | (10) | (58)
Issued under dividend reinvestment plan |  | 31
Issued on exercise of stock options and deferred share units | 1 | 5
Balance, end of year | 1,940 | 1,949
Balance, beginning of year | $ 23,127 | $ 22,961
Repurchased for cancellation | (121) | (677)
Issued under dividend reinvestment plan |  | 739
Issued on exercise of stock options and deferred share units | 36 | 104
Balance, end of year | $ 23,042 | $ 23,127

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