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Derivative and Hedging Instruments - Cost of Hedging (Details) - IFRS 9 - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Foreign exchange risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year $ 0 $ (3)
Changes in fair value 111 5
Amount reclassified to profit or loss 0 2
Accumulated other comprehensive income (loss), end of year 111 0
Foreign exchange and interest rate risk    
Accumulated other comprehensive income (loss) [Roll Forward]    
Accumulated other comprehensive income (loss), beginning of year 18 25
Changes in fair value (10) (8)
Amount reclassified to profit or loss 0 (1)
Accumulated other comprehensive income (loss), end of year $ 8 $ 18