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Financial Instruments - Inception Gains And Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract]      
Unamortized net gain (loss) at beginning of year $ (213) $ (131) $ (33)
New inception loss   (37) (79)
Change resulting from amended contract   0 0
Change in foreign exchange rates   (10) 0
Amortization recorded in net earnings during the year   (35) (19)
Unamortized net gain (loss) at end of year   (213) $ (131)
Impacts of the PPA Contract Amendments      
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract]      
Unamortized net gain (loss) at beginning of year (213)    
New inception loss 47    
Change resulting from amended contract 190    
Change in foreign exchange rates 6    
Amortization recorded in net earnings during the year (27)    
Unamortized net gain (loss) at end of year $ 3 $ (213)