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Stock-Based Compensation Plans - Additional Information (Detail)
12 Months Ended
Jan. 01, 2021
shares
Dec. 31, 2021
CAD ($)
Plan
shares
plans
$ / shares
Dec. 31, 2020
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of Deferred Share Unit Plans | plans   2  
Liabilities from share based payment | $   $ 317,000,000 $ 130,000,000
Net settlement rights      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Options expiration term   7 years  
Weighted average unit fair value of granted | $   $ 3.27  
Additional NSR vested and exercisable 2,700,000    
Number of units exercised (in shares)   529,000  
Weighted Average Exercise Price, Exercised | $ / shares   $ 10.51  
Replacement Stock Options      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of share options per replacement stock option (in shares) 0.7845    
Number of units exercised (in shares)   790,000  
Number of Shares Issued Upon Conversion of Convertible Securities   6,000  
Weighted Average Exercise Price, Exercised | $ / shares   $ 3.64  
Replacement Stock Options | Settled for common shares      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of units exercised (in shares)   8,000  
Replacement Stock Options | Settled for cash      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of units exercised (in shares)   782,000  
PSUs      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Liabilities from share based payment | $   $ 61,000,000 $ 65,000,000
Number of shares vested     7,100,000
Intrinsic value of vested | $   $ 0 $ 51,000,000
RSUs      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Award vesting term   3 years  
Liabilities from share based payment | $   $ 53,000,000 61,000,000
Number of shares vested   8,200,000  
Weighted average trading days   30 days  
Intrinsic value of vested | $   $ 0 60,000,000
DSUs      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Award vesting term   3 years  
Liabilities from share based payment | $   $ 20,000,000 $ 10,000,000
DSUs | Bottom of range      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of Deferred Share Unit Plans | Plan   0  
DSUs | Top of range      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of Deferred Share Unit Plans | Plan   2  
DSUs Option One      
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      
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      
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      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Percentage of options exercisable   30.00%  
3 Years      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Percentage of options exercisable   30.00%