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Long-Term Debt - Carrying Value of Long Term Debt Instruments (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt $ 4,882   $ 6,164
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 $ 1,455   1,460
4.70% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Jun. 23, 2016    
Maturity date Jun. 23, 2046    
Par value   1,000  
Long-term debt     1,265
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 $ 939   943
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 $ 253   254
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 $ 630   632
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 $ 342   343
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 $ 1,263   $ 1,267