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Document and Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Disclosure of classes of share capital [line items]  
Document Type 40-F
Document Period End Date Dec. 31, 2019
Amendment Flag false
Entity Registrant Name SUN LIFE FINANCIAL INC
Entity Central Index Key 0001097362
Entity Current Reporting Status Yes
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Common shares  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 587,843,688
Class A Preferred Shares Series 1  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 16,000,000
Class A Preferred Shares Series 2  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 13,000,000
Class A Preferred Shares Series 3  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class A Preferred Shares Series 4  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 12,000,000
Class A Preferred Shares Series 5  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class A Preferred Shares Series 8R  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 5,192,686
Class A Preferred Shares Series 9QR  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 6,007,314
Class A Preferred Shares Series 10R  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 6,919,928
Class A Preferred Shares Series 11QR  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 1,080,072
Class A Preferred Shares Series 12R  
Disclosure of classes of share capital [line items]  
Entity Common Stock, Shares Outstanding 12,000,000