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Invested Assets and Investment Income - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Assets $ 978,818 $ 875,574
Liabilities 925,858 826,847
Transfers out of level 1 and level 2 of fair value hierarchy assets 0 0
Segregated Funds Member    
Disclosure of financial assets [line items]    
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 0 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 0 0
Other    
Disclosure of financial assets [line items]    
Equity method income 398 399
Securitized Assets | Total fair value    
Disclosure of financial assets [line items]    
Assets 6,521 5,782
Liabilities $ 6,182 $ 5,456