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Investment Contract Liabilities - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of performance obligations [line items]    
Reinsurance contract held liabilities $ 2,669 $ 2,831
Total fair value    
Disclosure of performance obligations [line items]    
Reinsurance contract held liabilities 978 27
Carrying amount    
Disclosure of performance obligations [line items]    
Reinsurance contract held liabilities 1,052 27
FVTPL | Total fair value    
Disclosure of performance obligations [line items]    
Fair value of reinsurance contract assets backing investment contract liabilities   0
FVOCI    
Disclosure of performance obligations [line items]    
Interest income from contracts 29 0
Changes in contract fair value 24 0
FVOCI | Total fair value    
Disclosure of performance obligations [line items]    
Fair value of reinsurance contract assets backing investment contract liabilities 669  
Amortized cost    
Disclosure of performance obligations [line items]    
Interest income from contracts $ 41 $ 2