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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Aug. 13, 2024
Disclosure of detailed information about borrowings [line items]      
Borrowings outstanding $ 6,179 $ 6,178  
Fair value of borrowings outstanding $ 6,179 5,888  
Borrowings term 5 years    
Subordinated debt      
Disclosure of detailed information about borrowings [line items]      
Borrowings outstanding $ 6,179 6,178  
Interest expense on subordinated debt $ 223 213  
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 $ 399 398  
Subordinated Debt Issued August 13, 2019      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.38%    
Borrowings outstanding $ 0 750 $ 750
Subordinated Debt Issued May 8, 2020      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.58%    
Borrowings outstanding $ 998 997  
Subordinated Debt Issued October 1, 2020      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.06%    
Borrowings outstanding $ 747 747  
Subordinated Debt Issued November 18, 2021, Redemption November 18, 2026      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.46%    
Borrowings outstanding $ 499 498  
Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028      
Disclosure of detailed information about borrowings [line items]      
Interest rate 2.80%    
Borrowings outstanding $ 997 996  
Subordinated Debt Issued November 18, 2021, Redemption November 18, 2031      
Disclosure of detailed information about borrowings [line items]      
Interest rate 3.15%    
Borrowings outstanding $ 498 498  
Subordinated Debt Issued August 10, 2022      
Disclosure of detailed information about borrowings [line items]      
Interest rate 4.78%    
Borrowings outstanding $ 648 647  
Sun Life Financial Inc. Subordinated Debt Issued July 4, 2023      
Disclosure of detailed information about borrowings [line items]      
Interest rate 5.50%    
Borrowings outstanding $ 497 497  
Sun Life Financial Inc. Subordinated Debt Issued May 15, 2024      
Disclosure of detailed information about borrowings [line items]      
Interest rate 5.12%    
Borrowings outstanding $ 746 $ 0  
Government of Canada Bond Yield | Subordinated Debt Issued May 15, 1998      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.16%    
Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued May 8, 2020      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.66%    
Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued October 1, 2020      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.03%    
Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.69%    
Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued November 18, 2021, Redemption November 18, 2031      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.91%    
Canada Overnight Repo Rate Average (CORRA) | Subordinated Debt Issued August 10, 2022      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.96%    
Canada Overnight Repo Rate Average (CORRA) | Sun Life Financial Inc. Subordinated Debt Issued July 4, 2023      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.93%    
Canada Overnight Repo Rate Average (CORRA) | Sun Life Financial Inc. Subordinated Debt Issued May 15, 2024      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.46%    
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 November 18, 2021, Redemption November 18, 2026      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.44%    
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 May 8, 2020      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.515%    
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%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.285%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued November 18, 2021, Redemption November 18, 2031      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.335%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Sun Life Financial Inc. Subordinated Debt Issued August 10, 2027 and August 10, 2029      
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 | Sun Life Financial Inc. Subordinated Debt Issued July 4, 2028 and July 4, 2030      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.525%    
Before earliest par call or redemption date | Government of Canada Bond Yield | Sun Life Financial Inc. Subordinated Debt Issued May 15, 2029 and May 15, 2031      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 0.355%