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Equity - Additional Information (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 12, 2023 $ / shares shares | Apr. 26, 2023 | Nov. 30, 2024 shares | Feb. 25, 2025 CAD ($) shares | Dec. 31, 2024 CAD ($) $ / shares | Sep. 30, 2024 $ / shares | Jun. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares | Dec. 31, 2024 CAD ($) shares votePerShare $ / shares | Dec. 31, 2023 CAD ($) shares $ / shares | Dec. 31, 2022 consecutive_trading_day | Dec. 31, 2017
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share option, available for grant (in shares) |  |  |  |  |  |  |  |  | 9,001,488 |  |  |
Share option, granted (in shares) |  |  |  |  |  |  |  |  | 1,082,270 | 1,383,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 52.85 | $ 54.66 |  |
Share option granted, vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Share option granted, term |  |  |  |  |  |  |  |  | 10 years |  |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 21.21 | 22.69 |  |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 62.98 | $ 54.46 |  |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  |  | $ 91 | $ 81 |  |
Dilutive shares were not included in the diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 1,036,929,000 | 1,321,427,000 |  |
Dividends declared and paid per share | $ |  |  |  |  |  |  |  |  | $ 514 | $ 515 |  |
Bottom of range |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 0.00% |
Top of range |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 200.00% |
Share option compensation expense |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  |  | $ 21 | 26 |  |
PSUs |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days | consecutive_trading_day |  |  |  |  |  |  |  |  |  |  | 20 |
Performance metric respective grant, percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |
Performance metric one grant, percentage |  |  |  |  | 40.00% |  |  |  | 40.00% |  |  |
Performance metric two, three and four respective grant, percentage |  |  |  |  | 20.00% |  |  |  | 20.00% |  | 20.00% |
Share options granted percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00%
PSUs | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 0.00% |
PSUs | Top of range |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 200.00% |
Deferred share units (DSUs), restricted share units (RSUs), performance share units (PSUs) and performance deferred share units (PDSUs) |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  |  | $ 70 | 55 |  |
Total liability and intrinsic value for vested Units | $ |  |  |  |  | $ 113 |  |  |  | $ 113 | $ 171 |  |
Class A Common Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | votePerShare |  |  |  |  |  |  |  |  | 100 |  |  |
Number of sunset for the multiple voting rights |  | 6 years |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 |  |  |  |
Dividends paid, other shares per share | $ / shares |  |  |  |  |  | 0.625 |  | 0.625 |  |  |  |
Class B Subordinate Voting Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | votePerShare |  |  |  |  |  |  |  |  | 1 |  |  |
Share exchanged ratio (in usd per share) | $ / shares | $ 0.67 |  |  |  |  |  |  |  |  |  |  |
Increase in shareholders funds (in shares) | 302,000,000 |  |  |  |  |  |  |  |  |  |  |
Voting shares, renamed common shares, premium (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |
Number of share options issuable for grants (in shares) |  |  |  |  |  |  |  |  | 46,000,000 |  |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  |  | $ 0.125 | 0.125 | $ 0.125 | 0.125 |  |  |  |
Dividends paid, other shares per share | $ / shares |  |  |  |  |  | $ 0.625 |  | $ 0.625 |  |  |  |
Stock repurchase program, term |  |  |  |  |  |  |  |  | 1 year |  |  |
Treasury stock shares authorized for repurchase |  |  | 40,000,000 |  |  |  |  |  |  |  |  |
Purchase of voting shares under normal course issuer bid (in shares) |  |  |  |  |  |  |  |  | 19,258,016 | 4,737,561 |  |
Purchase of treasury shares | $ |  |  |  |  |  |  |  |  | $ 1,300 | $ 250,000 |  |
Income tax relating to treasury repurchases | $ |  |  |  |  |  |  |  |  | 15 |  |  |
Payments for repurchase of common stock | $ |  |  |  |  |  |  |  |  | $ 1,200 |  |  |
Cancellation of treasury shares, shares |  |  |  |  |  |  |  |  | 19,158,016 |  |  |
Class B Subordinate Voting Shares | Major ordinary share transactions [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for repurchase of common stock | $ |  |  |  | $ 6 |  |  |  |  |  |  |  |
Cancellation of treasury shares, shares |  |  |  | 100,000 |  |  |  |  |  |  |  |

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