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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 $ / shares | Feb. 18, 2023 $ / shares shares | Oct. 31, 2022 shares | Dec. 31, 2022 CAD ($) $ / shares | Sep. 30, 2022 $ / shares | Jun. 30, 2022 $ / shares | Mar. 31, 2022 CAD ($) $ / shares | Dec. 31, 2021 CAD ($) $ / shares | Sep. 30, 2021 $ / shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2022 CAD ($) shares votePerShare $ / shares | Dec. 31, 2021 CAD ($) shares $ / shares | Dec. 31, 2017 consecutive_trading_days
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share option, available for grant (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,693,150 |  |
Share option, granted (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 1,729,260 | 2,519,000 |
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 45.51 | $ 29.04 |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 17.13 | 10.83 |
Share option granted, vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Share option granted, term |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 45.75 | $ 29.25 |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  |  |  |  | $ 236 | $ 125 |
Dilutive shares were not included in the diluted earnings per share | shares |  |  |  |  |  |  |  |  |  |  |  | 1,635,225,000 | 7,700,774,000 |
Dividends paid, ordinary shares per share | $ / shares |  |  |  |  |  |  |  | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |
Dividends declared and paid per share |  |  |  |  |  |  |  |  |  |  |  | $ 532 | $ 106 |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  |  |  |  | 1,392 | 0 |
Potential ordinary share transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sunset period |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |
Share Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  |  |  |  | 26 | 28 |
PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days | consecutive_trading_days |  |  |  |  |  |  |  |  |  |  |  |  |  | 20
Share options granted percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
PSUs | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%
PSUs | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [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 terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  |  |  |  | 210 | 97 |
Total liability and intrinsic value for vested Units |  |  |  | $ 230 |  |  |  | $ 160 |  |  |  | $ 230 | $ 160 |
Class A Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | votePerShare |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.625 |  |  |  |  |  |  |
Dividends declared and paid per share |  |  |  |  |  |  | $ 337 |  |  |  |  |  |  |
Class A Common Shares | Potential ordinary share transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) | shares |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares | $ 0.50 | $ 0.625 |  |  |  |  |  |  |  |  |  |  |  |
Class B Subordinate Voting Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | votePerShare |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of share options issuable for grants (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |
Dividends paid, ordinary shares per share | $ / shares |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.625 |  |  |  |  |  |  |
Dividends declared and paid per share |  |  |  |  |  |  | $ 337 |  |  |  |  |  |  |
Stock repurchase program, term |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Purchase of voting shares under normal course issuer bid (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 30,703,473 | 0 |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  |
Treasury Stock Shares Authorized For Repurchase | shares |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Class B Subordinate Voting Shares | Potential ordinary share transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) | shares |  | 0.67 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares | $ 0.50 | $ 0.625 |  |  |  |  |  |  |  |  |  |  |  |

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