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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Line Items] |  |  |  |
Dividends paid on common shares |  | $ 77 | $ 260 | $ 245
Common Share [Member] |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Dividends paid on common shares | $ 77 |  | $ 260 | $ 245
Dividend paid per share | $ 0.0625 |  | $ 0.2125 | $ 0.20
Dividend declared but not paid |  | $ 0.0175 |  |
Dividends payable date |  | Mar. 31, 2021 |  |
Dividends payables date of record |  | Mar. 15, 2021 |  |
Preferred Share [Member] |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Dividends payable date |  | Mar. 31, 2021 |  |
Dividend declared but not paid to preferred shareholders |  | $ 8 |  |
NSRs [Member] |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Options excluded from diluted weighted average number of shares |  | 31 | 32 | 34

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