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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($)
$ in Millions
 12 Months Ended
Sep. 19, 2023
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2023
Disclosure of detailed information about borrowings [line items]        
Borrowings outstanding   $ 6,178 $ 6,676  
Fair value of borrowings outstanding   $ 5,888 6,106  
Borrowings term   5 years    
Subordinated debt        
Disclosure of detailed information about borrowings [line items]        
Borrowings outstanding   $ 6,178   $ 6,676
Interest expense on subordinated debt   $ 213 198  
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 19, 2016        
Disclosure of detailed information about borrowings [line items]        
Interest rate   3.05%    
Borrowings outstanding   $ 0 999  
Subordinated Debt Issued August 13, 2019        
Disclosure of detailed information about borrowings [line items]        
Interest rate   2.38%    
Borrowings outstanding   $ 750 749  
Subordinated Debt Issued May 8, 2020        
Disclosure of detailed information about borrowings [line items]        
Interest rate   2.58%    
Borrowings outstanding   $ 997 996  
Repayments of subordinated liabilities $ 1,000      
Subordinated Debt Issued October 1, 2020        
Disclosure of detailed information about borrowings [line items]        
Interest rate   2.06%    
Borrowings outstanding   $ 747 746  
Subordinated Debt Issued November 18, 2021, Redemption November 18, 2026        
Disclosure of detailed information about borrowings [line items]        
Interest rate   2.46%    
Borrowings outstanding   $ 498 498  
Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028        
Disclosure of detailed information about borrowings [line items]        
Interest rate   2.80%    
Borrowings outstanding   $ 996 996  
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   $ 647 646  
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 $ 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%    
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 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 August 13, 2019        
Disclosure of detailed information about borrowings [line items]        
Adjustment to interest rate basis   0.85%    
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   0.52%    
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%    
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%