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Equity Capital and Earnings Per share - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 19, 2025 | May 07, 2024 | Feb. 20, 2024 | Dec. 31, 2024 | Dec. 31, 2023
NCIB |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Stock repurchased and retired during period shares |  |  |  | 82,800,000 | 62,600,000
Total cost of shares |  |  |  | $ 3,212 | $ 1,595
Tax incurred on repurchases shares |  |  |  | $ 60 |
Options and Deferred Share Units |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Number of instruments outstanding in a share based payment arrangement |  |  |  | 12,000,000 | 17,000,000
Common shares | Major ordinary share transactions |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Dividend declared but not paid | $ 0.44 |  |  |  |
NCIB 2024 |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Common stock shares authorized for repurchase |  |  | 50,000,000 |  |
NCIB 2024 | Top of range |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Common stock shares authorized for repurchase |  | 90,000,000 |  |  |
NCIB 2024 | Major ordinary share transactions |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Percentage of the companys issued and outstanding common shares |  |  | 2.80% |  |
NCIB 2024 | Major ordinary share transactions | Top of range |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Percentage of the companys issued and outstanding common shares |  | 5.00% |  |  |
NCIB 2023 and NCIB 2024 | Issued capital |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Increase decrease through treasury share transactions |  |  |  | $ 990 | $ 745
NCIB 2023 and NCIB 2024 | Retained earnings |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Increase decrease through treasury share transactions |  |  |  | $ 2,282 | $ 850
NCIB 2022 | NCIB |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Stock repurchased and retired during period shares |  |  |  |  | 6,900,000
Total cost of shares |  |  |  |  | $ 175
NCIB 2025 |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Common stock shares authorized for repurchase | 51,500,000 |  |  |  |
NCIB 2025 | Major ordinary share transactions |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |
Percentage of the companys issued and outstanding common shares | 3.00% |  |  |  |

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