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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 07, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Dividends paid on common shares |  |  | $ 77 | $ 260
Net settlement rights |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Instruments excluded from calculation, shares (in shares) |  | 18.0 | 31.0 | 32.0
Common shares |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Instruments excluded from calculation, value |  | $ 22 |  |
Instruments excluded from calculation, shares (in shares) |  | 1.9 |  |
Dividends paid on common shares |  | $ 176 | $ 77 | $ 260
Dividends paid (in CAD per share) |  | $ 0.0875 | $ 0.0625 | $ 0.2125
Dividends declared (in CAD per share) | $ 0.0350 |  |  |
Preferred Shares |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Dividends paid on common shares |  | $ 34 |  |
Dividends declared | $ 9 |  |  |

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- Definition Instruments With Potential Future Dilutive Effect Not Included In Calculation Of Diluted Earnings Per Share, Value + References No definition available. + Details
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