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Long-Term Debt - Carrying Value of Long Term Debt Instruments (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Jan. 01, 2022
CAD ($)
Disclosure of detailed information about borrowings [Line Items]        
Long-term debt $ 6,071   $ 6,234 $ 4,882
3.050% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Aug. 27, 2020      
Maturity date Aug. 27, 2060      
Par value   $ 1,155    
Long-term debt $ 1,519   1,559  
5.375% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Mar. 04, 2016      
Maturity date Mar. 04, 2046      
Par value   750    
Long-term debt $ 977   1,004  
3.703% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Mar. 16, 2022      
Maturity date Mar. 16, 2032      
Par value   750    
Long-term debt $ 983   1,011  
2.396% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Jun. 01, 2020      
Maturity date Jun. 01, 2027      
Par value   200    
Long-term debt $ 263   270  
2.484% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date May 19, 2020      
Maturity date May 19, 2027      
Par value   500    
Long-term debt $ 657   674  
3.527% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Dec. 02, 2016      
Maturity date Dec. 02, 2026      
Par value   270    
Long-term debt $ 356   365  
4.150% Senior notes [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Issue date Mar. 04, 2016      
Maturity date Mar. 04, 2026      
Par value   $ 1,000    
Long-term debt $ 1,316   $ 1,351