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FV Measurements (Hybrid Notes) (Narrative) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Hybrid Instruments [Line Items]    
Hybrid Notes as a hedge of the foreign currency exposure $ 1,200 $ 1,100
Net investment in United States dollar denominated operations    
Hybrid Instruments [Line Items]    
Hybrid Notes as a hedge of the foreign currency exposure 1,200  
After-tax foreign currency gain (loss) $ 38 $ (97)