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Equity Capital and Earnings Per share - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 15, 2023 shares | Feb. 28, 2022 CAD ($) | Dec. 31, 2022 CAD ($) shares | Dec. 31, 2022 $ / shares | Dec. 31, 2022 CAD ($) shares | Feb. 03, 2022 $ / shares
NCIB [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Share purchased and cancelled subsequently | shares |  |  |  |  | 78.9 |
Stock repurchased and retired during period value |  |  | $ 2,060 |  |  |
Percentage of shares purchased for cancellation to issued and outstanding shares |  |  |  |  |  | 4.40%
Stock repurchased and retired during period shares | shares |  |  | 85.8 |  |  |
Par value per share | $ / shares |  |  |  |  |  | $ 23.99
Retained earnings [member] | NCIB [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  | $ 946 |
Major ordinary share transactions [Member] | NCIB [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Stock repurchased and retired during period value |  | $ 97 |  |  |  |
Common shares [Member] | NCIB [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Total Cost of Share |  |  |  |  | 1,884 |
Purchase of treasury shares |  |  |  |  | $ 938 |
Common shares [Member] | Major ordinary share transactions [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Dividend declared but not paid | $ / shares |  |  |  | $ 0.365 |  |
NCIB Two Thousand And Twenty Three [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Common Stock Shares Authorised For Repurchase | shares | 55.7 |  |  |  |  |
NCIB Two Thousand And Twenty Three [Member] | Major ordinary share transactions [Member] |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |
Percentage of the companys issued and outstanding common shares | 3.00% |  |  |  |  |

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