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Commitments, Guarantees and Contingencies - Consolidating Summary Financial Information (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Outstanding preferred shares subject to the guarantee (in shares) 0  
Revenue $ 39,679,000,000 $ 26,997,000,000
Shareholders’ net income (loss) 2,713,000,000 2,616,000,000
Invested assets 161,619,000,000 151,726,000,000
Total other general fund assets 18,610,000,000 17,039,000,000
Investments for account of segregated fund holders 116,973,000,000 103,062,000,000
Insurance contract liabilities 131,184,000,000 121,923,000,000
Investment contract liabilities 3,116,000,000 3,164,000,000
Total other general fund liabilities 21,421,000,000 19,108,000,000
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 $ (1,743,000,000) (436,000,000)
Shareholders’ net income (loss) (2,631,000,000) (2,418,000,000)
Invested assets (23,084,000,000) (22,560,000,000)
Total other general fund assets (21,480,000,000) (19,396,000,000)
Investments for account of segregated fund holders 0 0
Insurance contract liabilities (9,888,000,000) (8,677,000,000)
Investment contract liabilities 0 0
Total other general fund liabilities (14,788,000,000) (13,301,000,000)
Parent Company | Reportable Legal Entities    
Disclosure of operating segments [line items]    
Revenue 213,000,000 361,000,000
Shareholders’ net income (loss) 2,713,000,000 2,616,000,000
Invested assets 23,639,000,000 24,255,000,000
Total other general fund assets 4,135,000,000 4,088,000,000
Investments for account of segregated fund holders 0 0
Insurance contract liabilities 0 0
Investment contract liabilities 0 0
Total other general fund liabilities 4,376,000,000 4,636,000,000
Subsidiary Issuer | Reportable Legal Entities | Sun Life Assurance (consolidated)    
Disclosure of operating segments [line items]    
Revenue 33,693,000,000 22,619,000,000
Shareholders’ net income (loss) 1,750,000,000 2,036,000,000
Invested assets 152,512,000,000 143,040,000,000
Total other general fund assets 24,000,000,000 21,958,000,000
Investments for account of segregated fund holders 116,918,000,000 103,014,000,000
Insurance contract liabilities 131,428,000,000 122,066,000,000
Investment contract liabilities 3,116,000,000 3,164,000,000
Total other general fund liabilities 23,780,000,000 21,801,000,000
Subsidiary Issuer | Reportable Legal Entities | Other Subsidiaries [Member]    
Disclosure of operating segments [line items]    
Revenue 7,516,000,000 4,453,000,000
Shareholders’ net income (loss) 881,000,000 382,000,000
Invested assets 8,552,000,000 6,991,000,000
Total other general fund assets 11,955,000,000 10,389,000,000
Investments for account of segregated fund holders 55,000,000 48,000,000
Insurance contract liabilities 9,644,000,000 8,534,000,000
Investment contract liabilities 0 0
Total other general fund liabilities $ 8,053,000,000 $ 5,972,000,000