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Financial Instruments - Foreign Currency Exchange Rate Risk Management (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about hedging instruments [line items]        
Cash proceeds from settlement of cash flow hedge $ 4 $ 15 $ 13  
6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about hedging instruments [line items]        
Notional amount       $ 1,100,000,000
Cross currency swaps | Cash flow hedges | Currency risk        
Disclosure of detailed information about hedging instruments [line items]        
Cash proceeds from settlement of cash flow hedge $ 158      
Cross currency swaps | Currency swap contract, term through March 2038 | Cash flow hedges | Currency risk        
Disclosure of detailed information about hedging instruments [line items]        
Nominal amount of hedging instrument       550,000,000
Average foreign exchange rate 0.0625      
Foreign currency forward contracts | Currency risk        
Disclosure of detailed information about hedging instruments [line items]        
Notional amount       $ 1,017,000,000
Derivative, term of contract 90 days