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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 CAD ($) $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 CAD ($) $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2019 CAD ($) shares vote_per_share $ / shares | Dec. 31, 2019 CAD ($) $ / shares | Dec. 31, 2018 CAD ($) shares $ / shares | Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2017 tradingdays
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options issuable for grants (in shares) | shares |  |  |  |  |  |  |  |  | 28,000,000 |  |  |  |
Share option, available for grant (in shares) | shares |  |  |  |  |  |  |  |  | 1,759,503 |  |  |  |
Share option, granted (in shares) | shares |  |  |  |  |  |  |  |  | 1,940,210 |  | 1,575,000 |  |
Weighted average exercise price of share options granted in share-based payment arrangement | (per share) |  |  |  |  |  |  |  |  | $ 28.62 | $ 28.62 |  | $ 37.44 |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 10.73 |  | $ 11.10 |  |
Share option granted, vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Share option granted, term |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 26.58 |  | $ 32.55 |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  |  | $ 4 |  | $ 59 |  |
Dilutive shares were not included in the diluted earnings per share | shares |  |  |  |  |  |  |  |  |  |  | 5,458,816 |  |
Dividends paid, ordinary shares per share | $ / shares | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.15 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  |  |
Payments to acquire or redeem entity's shares | $ |  |  |  |  |  |  |  |  | 661 |  | $ 189 |  |
Stock purchased, canceled in subsequent year | shares |  |  |  |  |  |  |  |  |  |  | 240,000 |  |
Stock purchased, canceled in subsequent year | $ |  |  |  |  |  |  |  |  |  |  | $ 7 |  |
Share Options |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) | $ |  |  |  |  |  |  |  |  | 18 |  | 17 |  |
PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days | tradingdays |  |  |  |  |  |  |  |  |  |  |  |  | 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) | $ |  |  |  |  |  |  |  |  | (14) |  | 42 |  |
Total liability and intrinsic value for vested Units | $ | $ 71 |  |  |  | $ 103 |  |  |  | $ 71 | $ 71 | $ 103 | $ 103 |
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 |  |  |  |
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 |  |  |  |
Stock repurchase program, term |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Purchase of voting shares under normal course issuer bid (in shares) | shares |  |  |  |  |  |  |  |  | 24,399,468 |  | 6,539,558 |  |
Payments to acquire or redeem entity's shares | $ |  |  |  |  |  |  |  |  | $ 654 |  |  |  |
Stock canceled (in shares) | shares |  |  |  |  |  |  |  |  | 24,639,468 |  | 6,299,558 |  |

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