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Commitments, Guarantees and Contingencies - Consolidating Summary Financial Information (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Principal amount   $ 9,159,000,000
Insurance revenue $ 22,637,000,000 21,356,000,000
Net investment income (loss) excluding result for segregated fund holders 7,415,000,000 11,586,000,000
Fee income 8,581,000,000 7,832,000,000
Other income 163,000,000 169,000,000
Total revenue 38,796,000,000 40,943,000,000
Shareholders' net income (loss) 3,129,000,000 3,165,000,000
Invested assets 189,817,000,000 174,328,000,000
Reinsurance contracts held that are assets 6,318,000,000 5,794,000,000
Insurance contract assets 355,000,000 184,000,000
Total other general fund assets 25,445,000,000 24,483,000,000
Investments for account of segregated fund holders 148,786,000,000 128,452,000,000
Insurance contract liabilities excluding those for account of segregated fund holders 147,269,000,000 135,669,000,000
Reinsurance contract held liabilities 1,825,000,000 1,623,000,000
Investment contract liabilities 11,678,000,000 11,672,000,000
Total other general fund liabilities 35,034,000,000 31,625,000,000
Insurance contract liabilities for account of segregated fund holders 20,097,000,000 19,041,000,000
Investment contract liabilities for account of segregated fund holders 128,689,000,000 109,411,000,000
Subordinated Debt Issued May 15, 1998    
Disclosure of operating segments [line items]    
Principal amount $ 150,000,000  
Interest rate 6.30%  
Consolidation Adjustments    
Disclosure of operating segments [line items]    
Insurance revenue $ (1,593,000,000) (1,543,000,000)
Net investment income (loss) excluding result for segregated fund holders (270,000,000) (959,000,000)
Fee income (540,000,000) (503,000,000)
Other income 0 0
Total revenue (2,403,000,000) (3,005,000,000)
Shareholders' net income (loss) (3,175,000,000) (2,992,000,000)
Invested assets (26,634,000,000) (30,381,000,000)
Reinsurance contracts held that are assets (35,000,000) (67,000,000)
Insurance contract assets (1,455,000,000) (637,000,000)
Total other general fund assets (3,472,000,000) (3,171,000,000)
Investments for account of segregated fund holders 0 0
Insurance contract liabilities excluding those for account of segregated fund holders (35,000,000) (67,000,000)
Reinsurance contract held liabilities (1,456,000,000) (637,000,000)
Investment contract liabilities 0 0
Total other general fund liabilities (4,322,000,000) (5,596,000,000)
Insurance contract liabilities for account of segregated fund holders 0 0
Investment contract liabilities for account of segregated fund holders 0 0
Parent Company | Reportable Legal Entities    
Disclosure of operating segments [line items]    
Insurance revenue 0 0
Net investment income (loss) excluding result for segregated fund holders 305,000,000 466,000,000
Fee income 1,000,000 1,000,000
Other income 0 0
Total revenue 306,000,000 467,000,000
Shareholders' net income (loss) 3,128,000,000 3,165,000,000
Invested assets 28,494,000,000 26,239,000,000
Reinsurance contracts held that are assets 0 0
Insurance contract assets 0 0
Total other general fund assets 4,639,000,000 4,547,000,000
Investments for account of segregated fund holders 0 0
Insurance contract liabilities excluding those for account of segregated fund holders 0 0
Reinsurance contract held liabilities 0 0
Investment contract liabilities 0 0
Total other general fund liabilities 7,576,000,000 7,300,000,000
Insurance contract liabilities for account of segregated fund holders 0 0
Investment contract liabilities for account of segregated fund holders 0 0
Subsidiary Issuer | Reportable Legal Entities | Sun Life Assurance (consolidated)    
Disclosure of operating segments [line items]    
Insurance revenue 19,389,000,000 17,844,000,000
Net investment income (loss) excluding result for segregated fund holders 7,138,000,000 11,176,000,000
Fee income 1,992,000,000 1,687,000,000
Other income 0 169,000,000
Total revenue 28,519,000,000 30,876,000,000
Shareholders' net income (loss) 1,501,000,000 1,908,000,000
Invested assets 175,508,000,000 164,557,000,000
Reinsurance contracts held that are assets 6,353,000,000 5,858,000,000
Insurance contract assets 227,000,000 184,000,000
Total other general fund assets 13,979,000,000 13,302,000,000
Investments for account of segregated fund holders 148,720,000,000 128,396,000,000
Insurance contract liabilities excluding those for account of segregated fund holders 147,196,000,000 135,445,000,000
Reinsurance contract held liabilities 3,281,000,000 2,260,000,000
Investment contract liabilities 11,677,000,000 11,672,000,000
Total other general fund liabilities 16,191,000,000 15,041,000,000
Insurance contract liabilities for account of segregated fund holders 20,031,000,000 18,985,000,000
Investment contract liabilities for account of segregated fund holders 128,689,000,000 109,411,000,000
Subsidiary Issuer | Reportable Legal Entities | Other subsidiaries of SLF Inc. (combined)    
Disclosure of operating segments [line items]    
Insurance revenue 4,841,000,000 5,055,000,000
Net investment income (loss) excluding result for segregated fund holders 242,000,000 903,000,000
Fee income 7,128,000,000 6,647,000,000
Other income 163,000,000 0
Total revenue 12,374,000,000 12,605,000,000
Shareholders' net income (loss) 1,675,000,000 1,084,000,000
Invested assets 12,449,000,000 13,913,000,000
Reinsurance contracts held that are assets 0 3,000,000
Insurance contract assets 1,583,000,000 637,000,000
Total other general fund assets 10,299,000,000 9,805,000,000
Investments for account of segregated fund holders 66,000,000 56,000,000
Insurance contract liabilities excluding those for account of segregated fund holders 108,000,000 291,000,000
Reinsurance contract held liabilities 0 0
Investment contract liabilities 1,000,000 0
Total other general fund liabilities 15,589,000,000 14,880,000,000
Insurance contract liabilities for account of segregated fund holders 66,000,000 56,000,000
Investment contract liabilities for account of segregated fund holders $ 0 $ 0