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Stock-Based Compensation Plans - Additional Information (Detail) shares in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2021 shares | Dec. 31, 2020 CAD ($) shares Plan | Dec. 31, 2019 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Liabilities from share based payment |  | $ 130,000,000 | $ 60,000,000
NSRs [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Options expiration term |  | 7 years |
Weighted average unit fair value of granted |  | $ 2.27 |
NSRs [Member] | Events After Reporting [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Additional NSR vested and exercisable | shares | 2,738 |  |
PSUs [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period |  | 3 years |
Liabilities from share based payment |  | $ 65,000,000 | 53,000,000
Number of shares vested | shares |  | 7,055 |
Weighted average trading days |  | 30 days |
Intrinsic value of vested |  | $ 51,000,000 | 0
PSUs [Member] | Bottom of Range [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of units vesting |  | 0.00% |
PSUs [Member] | Top of Range [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of units vesting |  | 200.00% |
RSUs [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period |  | 3 years |
Liabilities from share based payment |  | $ 61,000,000 | 63,000,000
Number of shares vested | shares |  | 8,237 |
Weighted average trading days |  | 30 days |
Intrinsic value of vested |  | $ 60,000,000 | 0
DSUs [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Liabilities from share based payment |  | $ 10,000,000 | $ 16,000,000
Number of Deferred Share Unit Plans | Plan |  | 2 |
DSUs Option One [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of annual bonus award to convert into DSUs |  | 0.00% |
DSUs Option Two [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of annual bonus award to convert into DSUs |  | 25.00% |
DSUs Option Three [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of annual bonus award to convert into DSUs |  | 50.00% |
Later than one year [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of options exercisable |  | 30.00% |
Later than two years and not later than three years [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Percentage of options exercisable |  | 30.00% |

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