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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 12, 2023 $ / shares shares | Apr. 26, 2023 | Nov. 30, 2023 shares | Dec. 31, 2023 CAD ($) $ / shares | Sep. 30, 2023 $ / shares | Jun. 30, 2023 $ / shares | Mar. 31, 2023 $ / shares | Dec. 31, 2023 CAD ($) shares votePerShare $ / shares | Dec. 31, 2022 CAD ($) shares $ / shares | Dec. 31, 2017 consecutive_trading_days
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |
Share option, available for grant (in shares) | shares |  |  |  |  |  |  |  | 9,566,369 |  |
Share option, granted (in shares) | shares |  |  |  |  |  |  |  | 1,383,085 | 1,729,000 |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 54.66 | $ 45.51 |
Share option granted, vesting period |  |  |  |  |  |  |  | 3 years |  |
Share option granted, term |  |  |  |  |  |  |  | 10 years |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  | $ 22.69 | 17.13 |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  | $ 54.46 | $ 45.75 |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  | $ 107 | $ 236 |
Dilutive shares were not included in the diluted earnings per share | shares |  |  |  |  |  |  |  | 1,321,427,000 | 1,635,225,000 |
Dividends paid, other shares | $ |  |  |  |  |  |  |  | $ 321 | $ 337 |
Dividends declared and paid per share | $ |  |  |  |  |  |  |  | $ 515 | 532 |
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 Options |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  | $ 26 | 26 |
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) | $ |  |  |  |  |  |  |  | 81 | 210 |
Total liability and intrinsic value for vested Units | $ |  |  |  | $ 171 |  |  |  | $ 171 | 230 |
PSUs |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |
Consecutive trading days | consecutive_trading_days |  |  |  |  |  |  |  |  |  | 20
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%
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, other shares per share | $ / shares |  |  |  |  |  |  | $ 0.625 |  |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 |  |  |  |
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) | shares | 302,000,000 |  |  |  |  |  |  |  |  |
Voting shares, renamed common shares, premium (in shares) | shares | 1 |  |  |  |  |  |  |  |  |
Number of share options issuable for grants (in shares) | shares |  |  |  |  |  |  |  | 46,000,000 |  |
Treasury Stock Shares Authorized For Repurchase | shares |  |  | 40,000,000 |  |  |  |  |  |  |
Dividends paid, other shares per share | $ / shares |  |  |  |  |  |  | $ 0.625 |  |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 |  |  |  |
Stock repurchase program, term |  |  |  |  |  |  |  | 1 year |  |
Purchase of treasury shares | $ |  |  |  |  |  |  |  | $ 250 | $ 1,400 |
Purchase of voting shares under normal course issuer bid (in shares) | shares |  |  |  |  |  |  |  | 4,737,561 | 30,703,473 |

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