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Debt (Details)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 16, 2022
CAD ($)
Jun. 30, 2022
CAD ($)
Mar. 31, 2022
CAD ($)
Jun. 30, 2021
CAD ($)
Jun. 30, 2022
CAD ($)
Jun. 30, 2021
CAD ($)
Aug. 03, 2022
CAD ($)
Feb. 11, 2022
CAD ($)
Feb. 11, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]                  
Early debt redemption costs   $ 0 $ (18) $ 0 $ (18) $ (53)      
Maximum amount available under securitization program   1,300     1,300        
Securitized trade receivables   $ 900     $ 900        
Entering into significant commitments or contingent liabilities                  
Disclosure of detailed information about borrowings [line items]                  
Maximum amount available under securitization program             $ 2,300    
Securitized trade receivables             1,600    
Total securitized trade receivables collateralized             $ 3,200    
Series US-7 Notes                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount               $ 954 $ 750
Series M-26 medium term note                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount outstanding $ 1,000                
Fixed interest rate | Series US-7 Notes                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (as a percent)               3.65% 3.65%
Fixed interest rate | Series M-26 medium term note                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (as a percent) 3.35%