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Employee Future Benefits - Summary of Weighted Average Duration of the Defined Benefit Obligations (Detail) - yr
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension defined benefit plans [member] | U.S. plans [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration (in years) of the defined benefit obligations 8.4 8.2
Pension defined benefit plans [member] | Canadian plans [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration (in years) of the defined benefit obligations 9.9 10.6
Retiree welfare plans [Member] | U.S. plans [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration (in years) of the defined benefit obligations 8.2 8.2
Retiree welfare plans [Member] | Canadian plans [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration (in years) of the defined benefit obligations 11.1 11.1