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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 23, 2022 $ / shares | Dec. 31, 2021 CAD ($) $ / shares | Sep. 30, 2021 $ / shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2020 CAD ($) $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2021 CAD ($) shares vote_per_share $ / shares | Dec. 31, 2021 CAD ($) $ / shares | Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2017 consecutive_trading_days | Nov. 02, 2021 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options issuable for grants (in shares) | shares |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |
Share option, available for grant (in shares) | shares |  |  |  |  |  |  |  |  |  | 12,187,148 |  |  |  |  |
Share option, granted (in shares) | shares |  |  |  |  |  |  |  |  |  | 2,519,455 |  | 6,314,000 |  |  |
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares |  |  |  |  |  |  |  |  |  | $ 29.04 |  | $ 14.42 |  |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  | $ 10.83 |  | $ 4.76 |  |  |
Share option granted, vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Share option granted, term |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 29.25 |  | $ 16.15 |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  |  | $ 125 |  | $ 47 |  |  |
Dilutive shares were not included in the diluted earnings per share | shares |  |  |  |  |  |  |  |  |  | 7,700,774,000 |  |  |  |  |
Dividends declared and paid per share |  |  |  |  |  |  |  |  |  | $ 106 |  | 106 |  |  |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  |  | 0 |  | 207 |  |  |
Share Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  |  | 28 |  | 23 |  |  |
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) |  |  |  |  |  |  |  |  |  | 97 |  | 24 |  |  |
Total liability and intrinsic value for vested Units |  | $ 160 |  |  |  | $ 83 |  |  |  | $ 160 | $ 160 | $ 83 | $ 83 |  |
Class A Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | vote_per_share |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares |  | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  |  |  |
Class A Common Shares | Potential ordinary share transactions [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares | $ 0.625 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B Subordinate Voting Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share | vote_per_share |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares |  | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  |  |  |
Stock repurchase program, term |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Purchase of voting shares under normal course issuer bid (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 |  | 16,292,441 |  |  |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  |  |  |  | $ 207 |  |  |
Treasury stock, repurchase authorization amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40
Class B Subordinate Voting Shares | Potential ordinary share transactions [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share | $ / shares | $ 0.625 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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