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Commitments, Guarantees and Contingencies - Consolidating Summary Financial Information (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Outstanding preferred shares subject to the guarantee (in shares) 0    
Insurance revenue $ 21,356,000,000 $ 18,902,000,000  
Net investment income (loss) excluding result for segregated fund holders 11,586,000,000 (20,580,000,000)  
Fee income 7,832,000,000 7,447,000,000  
Other income 169,000,000 0  
Total revenue 40,943,000,000 5,769,000,000  
Shareholders' net income (loss) 3,165,000,000 2,941,000,000  
Invested assets 174,328,000,000 168,789,000,000 $ 185,268,000,000
Reinsurance contract held assets 5,794,000,000 6,115,000,000 6,612,000,000
Insurance contract assets 184,000,000 75,000,000 162,000,000
Total other general fund assets 24,483,000,000 23,337,000,000  
Investments for account of segregated fund holders (Note 21) 128,452,000,000 125,292,000,000 139,996,000,000
Insurance contract liabilities 135,669,000,000 131,294,000,000  
Reinsurance contract held liabilities 1,623,000,000 1,603,000,000 1,994,000,000
Investment contract liabilities 11,672,000,000 10,728,000,000 9,914,000,000
Total other general fund liabilities 31,625,000,000 31,804,000,000  
Insurance contract liabilities for account of segregated fund holders (Note 21) 19,041,000,000 23,139,000,000 26,079,000,000
Investment contract liabilities for account of segregated fund holders (Note 21) 109,411,000,000 102,153,000,000 $ 113,917,000,000
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 $ (1,543,000,000) (1,218,000,000)  
Net investment income (loss) excluding result for segregated fund holders (959,000,000) (1,330,000,000)  
Fee income (503,000,000) (423,000,000)  
Other income 0    
Total revenue (3,005,000,000) (2,971,000,000)  
Shareholders' net income (loss) (2,992,000,000) (2,620,000,000)  
Invested assets (30,381,000,000) (28,695,000,000)  
Reinsurance contract held assets (67,000,000) (70,000,000)  
Insurance contract assets (637,000,000) (719,000,000)  
Total other general fund assets (3,171,000,000) (10,704,000,000)  
Investments for account of segregated fund holders (Note 21) 0 0  
Insurance contract liabilities (67,000,000) (70,000,000)  
Reinsurance contract held liabilities (637,000,000) (719,000,000)  
Investment contract liabilities 0 (1,000,000)  
Total other general fund liabilities (5,596,000,000) (11,578,000,000)  
Insurance contract liabilities for account of segregated fund holders (Note 21) 0 0  
Investment contract liabilities for account of segregated fund holders (Note 21) 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 466,000,000 589,000,000  
Fee income 1,000,000 1,000,000  
Other income 0    
Total revenue 467,000,000 590,000,000  
Shareholders' net income (loss) 3,165,000,000 2,941,000,000  
Invested assets 26,239,000,000 25,851,000,000  
Reinsurance contract held assets 0 0  
Insurance contract assets 0 0  
Total other general fund assets 4,547,000,000 6,594,000,000  
Investments for account of segregated fund holders (Note 21) 0 0  
Insurance contract liabilities 0 0  
Reinsurance contract held liabilities 0 0  
Investment contract liabilities 0 0  
Total other general fund liabilities 7,300,000,000 9,916,000,000  
Insurance contract liabilities for account of segregated fund holders (Note 21) 0 0  
Investment contract liabilities for account of segregated fund holders (Note 21) 0 0  
Subsidiary Issuer | Reportable Legal Entities | Sun Life Assurance (consolidated)      
Disclosure of operating segments [line items]      
Insurance revenue 17,844,000,000 16,973,000,000  
Net investment income (loss) excluding result for segregated fund holders 11,176,000,000 (18,474,000,000)  
Fee income 1,687,000,000 1,630,000,000  
Other income 169,000,000    
Total revenue 30,876,000,000 129,000,000  
Shareholders' net income (loss) 1,908,000,000 1,603,000,000  
Invested assets 164,557,000,000 159,311,000,000  
Reinsurance contract held assets 5,858,000,000 6,182,000,000  
Insurance contract assets 184,000,000 75,000,000  
Total other general fund assets 13,302,000,000 12,877,000,000  
Investments for account of segregated fund holders (Note 21) 128,396,000,000 125,242,000,000  
Insurance contract liabilities 135,445,000,000 130,908,000,000  
Reinsurance contract held liabilities 2,260,000,000 2,322,000,000  
Investment contract liabilities 11,672,000,000 10,728,000,000  
Total other general fund liabilities 15,041,000,000 14,580,000,000  
Insurance contract liabilities for account of segregated fund holders (Note 21) 18,985,000,000 23,089,000,000  
Investment contract liabilities for account of segregated fund holders (Note 21) 109,411,000,000 102,153,000,000  
Subsidiary Issuer | Reportable Legal Entities | Other subsidiaries of SLF Inc. (combined)      
Disclosure of operating segments [line items]      
Insurance revenue 5,055,000,000 3,147,000,000  
Net investment income (loss) excluding result for segregated fund holders 903,000,000 (1,365,000,000)  
Fee income 6,647,000,000 6,239,000,000  
Other income 0    
Total revenue 12,605,000,000 8,021,000,000  
Shareholders' net income (loss) 1,084,000,000 1,017,000,000  
Invested assets 13,913,000,000 12,322,000,000  
Reinsurance contract held assets 3,000,000 3,000,000  
Insurance contract assets 637,000,000 719,000,000  
Total other general fund assets 9,805,000,000 14,570,000,000  
Investments for account of segregated fund holders (Note 21) 56,000,000 50,000,000  
Insurance contract liabilities 291,000,000 456,000,000  
Reinsurance contract held liabilities 0 0  
Investment contract liabilities 0 1,000,000  
Total other general fund liabilities 14,880,000,000 18,886,000,000  
Insurance contract liabilities for account of segregated fund holders (Note 21) 56,000,000 50,000,000  
Investment contract liabilities for account of segregated fund holders (Note 21) $ 0 $ 0