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Debt - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
CAD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
CAD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2021
CAD ($)
Sep. 30, 2022
CAD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
CAD ($)
Sep. 30, 2022
USD ($)
Mar. 14, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]                      
Repayment of term loan $ 504       $ 0 $ 636   $ 0      
Commercial Paper                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity                 $ 1,000,000,000    
Commercial paper borrowings $ 720         $ 720     $ 525,000,000   $ 265,000,000
Weighted-average interest rate 3.48%         3.48%     3.48%   0.32%
Term Credit Facility                      
Debt Instrument [Line Items]                      
Debt instrument, Face amount                   $ 500,000,000  
Repayment of term loan $ 504 $ 400,000,000 $ 132 $ 100,000,000              
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity                 $ 1,300,000,000    
5.100% 10-year Notes                      
Debt Instrument [Line Items]                      
Extinguishment of Debt, Amount           $ 125          
4.500% 10-year Notes                      
Debt Instrument [Line Items]                      
Extinguishment of Debt, Amount           313 $ 250,000,000        
6.99% Finance Lease                      
Debt Instrument [Line Items]                      
Extinguishment of Debt, Amount           $ 97 $ 76,000,000        
5.100% 10-year Notes                      
Debt Instrument [Line Items]                      
Debt instrument, Interest rate 5.10%         5.10%     5.10%    
Debt instrument, Term           10 years 10 years        
4.500% 10-year Notes                      
Debt Instrument [Line Items]                      
Debt instrument, Interest rate 4.50%         4.50%     4.50%    
Debt instrument, Term           10 years 10 years        
6.99% Finance Lease                      
Debt Instrument [Line Items]                      
Debt instrument, Interest rate 6.99%         6.99%     6.99%