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Equity - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 CAD ($) $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2019 CAD ($) $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2020 CAD ($) shares vote_per_share $ / shares | Dec. 31, 2020 USD ($) shares vote_per_share $ / shares | Dec. 31, 2019 CAD ($) shares $ / shares | Dec. 31, 2019 USD ($) shares $ / shares | Dec. 31, 2018 consecutive_trading_days | Dec. 31, 2017
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 | 46,000,000 |  |  |  |
Share option, available for grant (in shares) | shares |  |  |  |  |  |  |  |  | 13,806,488 | 13,806,488 |  |  |  |
Share option, granted (in shares) | shares |  |  |  |  |  |  |  |  | 6,313,710 | 6,313,710 | 1,940,000 | 1,940,000 |  |
Weighted average exercise price of share options granted in share-based payment arrangement | (per share) |  |  |  |  |  |  |  |  | $ 14.42 | $ 14.42 |  | $ 28.62 |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 4.76 |  | $ 10.73 |  |  |
Share option granted, vesting period |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |
Share option granted, term |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |
Average share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 16.15 |  | $ 26.58 |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  | $ 47 |  | $ 4 |  |  |
Dividends declared and paid per share |  |  |  |  |  |  |  |  |  | $ 106 |  | $ 111 |  |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  | 207 |  | 661 |  |  |
Share Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense (recovery) |  |  |  |  |  |  |  |  | 23 |  | 18 |  |  |
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) |  |  |  |  |  |  |  |  | (24) |  | 14 |  |  |
Total liability and intrinsic value for vested Units | $ 83 |  |  |  | $ 71 |  |  |  | $ 83 |  | $ 71 |  |  |
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 | 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 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 | 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 | 1 year |  |  |  |
Purchase of voting shares under normal course issuer bid (in shares) | shares |  |  |  |  |  |  |  |  | 16,292,441 | 16,292,441 | 24,639,468 | 24,639,468 |  |
Payments to acquire or redeem entity's shares |  |  |  |  |  |  |  |  | $ 207 |  | $ 661 |  |  |

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