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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 02, 2017
Sun Life Assurance Subordinated Debt Issued May 15, 1998      
Disclosure of detailed information about borrowings [line items]      
Interest rate 6.30%    
Borrowings outstanding $ 150 $ 150  
Subordinated Debt Issued May 29, 2007      
Disclosure of detailed information about borrowings [line items]      
Interest rate 5.40%    
Borrowings outstanding $ 398 398  
Subordinated Debt Issued January 30, 2008      
Disclosure of detailed information about borrowings [line items]      
Interest rate 5.59%    
Borrowings outstanding $ 0 400  
Subordinated Debt Issued March 2, 2012      
Disclosure of detailed information about borrowings [line items]      
Interest rate     4.38%
Borrowings outstanding $ 0 0 $ 800
Subordinated Debt Issued May 13, 2014      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.77%    
Borrowings outstanding $ 250 249  
Subordinated Debt Issued September 25, 2015      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.60%    
Borrowings outstanding $ 499 498  
Subordinated Debt Issued February 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Interest rate 3.10%    
Borrowings outstanding $ 349 349  
Subordinated Debt Issued September 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Interest rate 3.05%    
Borrowings outstanding $ 995 995  
Subordinated Debt Issued November 23, 2017      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.75%    
Borrowings outstanding $ 398 398  
Subordinated Debt      
Disclosure of detailed information about borrowings [line items]      
Borrowings outstanding 3,039 3,437  
Fair value of borrowings outstanding 3,129 3,583  
Interest expense on subordinated debt $ 105 $ 122  
Government of Canada Bond Yield | Sun Life Assurance Subordinated Debt Issued May 15, 1998      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.16%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued May 29, 2007      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.00%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued May 13, 2014      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.75%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued September 25, 2015      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.43%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued February 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 2.20%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued September 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.85%    
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued November 23, 2017      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.74%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued May 29, 2007      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.25%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued September 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.52%