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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
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | $ 42,163 |
Balance, end of year | $ 47,151 | $ 42,163
Common shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Balance, beginning of year | 1,982 | 1,975
Repurchased for cancellation | (23) |
Issued under dividend reinvestment plan | 9 |
Issued on exercise of stock options and deferred share units | 3 | 7
Balance, end of year | 1,971 | 1,982
Balance, beginning of year | $ 22,989 | $ 22,865
Repurchased for cancellation | (269) |
Issued under dividend reinvestment plan | 182 |
Issued on exercise of stock options and deferred share units | 59 | 124
Balance, end of year | $ 22,961 | $ 22,989

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