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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($)
$ in Millions
 12 Months Ended
Sep. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
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 September 25, 2015      
Disclosure of detailed information about borrowings [line items]      
Interest rate   2.60%  
Borrowings outstanding   $ 0 500
Repayments of subordinated liabilities $ 500    
Subordinated Debt Issued February 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Interest rate   3.10%  
Borrowings outstanding   $ 350 349
Subordinated Debt Issued September 19, 2016      
Disclosure of detailed information about borrowings [line items]      
Interest rate   3.05%  
Borrowings outstanding   $ 997 996
Subordinated Debt Issued November 23, 2017      
Disclosure of detailed information about borrowings [line items]      
Interest rate   2.75%  
Borrowings outstanding   $ 399 399
Subordinated Debt Issued August 13, 2019      
Disclosure of detailed information about borrowings [line items]      
Interest rate   2.38%  
Borrowings outstanding   $ 747 746
Adjustment to interest rate basis   0.85%  
Subordinated Debt Issued May 8, 2020      
Disclosure of detailed information about borrowings [line items]      
Interest rate   2.58%  
Borrowings outstanding   $ 995 0
Adjustment to interest rate basis   1.66%  
Subordinated Debt Issued October 1, 2020      
Disclosure of detailed information about borrowings [line items]      
Interest rate   2.06%  
Borrowings outstanding   $ 745 0
Adjustment to interest rate basis   1.03%  
Subordinated Debt      
Disclosure of detailed information about borrowings [line items]      
Borrowings outstanding   $ 4,781 3,538
Fair value of borrowings outstanding   5,190 3,727
Interest expense on subordinated debt   $ 131 $ 105
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 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%  
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued May 8, 2020      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis   0.52%  
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued October 1, 2020      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis   0.38%