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Commitments, Guarantees and Contingencies - Consolidating Summary Financial Information (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Outstanding preferred shares subject to the guarantee (in shares) 0  
Revenue $ 43,337,000,000 $ 39,679,000,000
Shareholders’ net income (loss) 2,498,000,000 2,713,000,000
Invested assets 177,912,000,000 161,619,000,000
Total other general fund assets 19,178,000,000 18,610,000,000
Investments for account of segregated fund holders 125,921,000,000 116,973,000,000
Insurance contract liabilities 145,773,000,000 131,184,000,000
Investment contract liabilities 3,189,000,000 3,116,000,000
Total other general fund liabilities 22,266,000,000 21,421,000,000
Sun Life Assurance 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]    
Revenue $ (2,160,000,000) (1,743,000,000)
Shareholders’ net income (loss) (2,379,000,000) (2,631,000,000)
Invested assets (30,520,000,000) (23,084,000,000)
Total other general fund assets (33,640,000,000) (21,480,000,000)
Investments for account of segregated fund holders 0 0
Insurance contract liabilities (10,813,000,000) (9,888,000,000)
Investment contract liabilities 0 0
Total other general fund liabilities (26,745,000,000) (14,788,000,000)
Parent Company | Reportable Legal Entities    
Disclosure of operating segments [line items]    
Revenue 266,000,000 213,000,000
Shareholders’ net income (loss) 2,498,000,000 2,713,000,000
Invested assets 26,019,000,000 23,639,000,000
Total other general fund assets 7,800,000,000 4,135,000,000
Investments for account of segregated fund holders 0 0
Insurance contract liabilities 0 0
Investment contract liabilities 0 0
Total other general fund liabilities 9,350,000,000 4,376,000,000
Subsidiary Issuer | Reportable Legal Entities | Sun Life Assurance (consolidated)    
Disclosure of operating segments [line items]    
Revenue 35,801,000,000 33,693,000,000
Shareholders’ net income (loss) 1,349,000,000 1,750,000,000
Invested assets 172,439,000,000 152,512,000,000
Total other general fund assets 24,327,000,000 24,000,000,000
Investments for account of segregated fund holders 125,859,000,000 116,918,000,000
Insurance contract liabilities 145,949,000,000 131,428,000,000
Investment contract liabilities 3,189,000,000 3,116,000,000
Total other general fund liabilities 25,920,000,000 23,780,000,000
Subsidiary Issuer | Reportable Legal Entities | Other Subsidiaries [Member]    
Disclosure of operating segments [line items]    
Revenue 9,430,000,000 7,516,000,000
Shareholders’ net income (loss) 1,030,000,000 881,000,000
Invested assets 9,974,000,000 8,552,000,000
Total other general fund assets 20,691,000,000 11,955,000,000
Investments for account of segregated fund holders 62,000,000 55,000,000
Insurance contract liabilities 10,637,000,000 9,644,000,000
Investment contract liabilities 0 0
Total other general fund liabilities $ 13,741,000,000 $ 8,053,000,000