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Segregated Funds - Changes in Investment Contracts for Account of Segregated Fund Holders (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Insurance Contracts And Investment Contracts For Account Of Segregated Fund Holders [Roll Forward]    
Balance as at January 1 $ 19,041  
Deductions from segregated funds:    
Balance as at December 31 20,097 $ 19,041
Investments for account of segregated fund holders    
Insurance Contracts And Investment Contracts For Account Of Segregated Fund Holders [Roll Forward]    
Balance as at January 1 109,411 102,153
Additions to segregated funds:    
Deposits 12,922 11,510
Net realized and unrealized gains (losses) 11,412 3,995
Other investment income 7,487 7,854
Total additions 31,821 23,359
Deductions from segregated funds:    
Payments to policyholders and their beneficiaries 11,718 10,793
Management fees 784 687
Taxes and other expenses 49 49
Foreign exchange rate movements (8) (76)
Total deductions 12,543 11,453
Reinsurance And Investment Contract Liabilities, Net Additions (Deductions) 19,278 11,906
Dispositions 0 (4,648)
Balance as at December 31 $ 128,689 $ 109,411