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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 3,878 $ 3,466 $ 2,940
Unused tax losses for which a deferred tax asset has not been recognised 597 696  
Capital tax losses for which no deferred tax asset recognised 26 181  
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised $ 4,606 $ 4,397  
Applicable tax rates 27.75% 27.80%  
Income tax expense (benefit) $ 461 $ 546  
Sun Life UK | Disposal groups classified as held for sale      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Income tax expense (benefit) (7)    
Losses available for carry forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Accumulated non-capital tax losses $ 4,388 4,349  
Bottom of range      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Applicable tax rates 0.00%    
Top of range      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Applicable tax rates 25.00%    
U.S.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net capital losses $ 9 10  
U.S. | Losses available for carry forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2 2  
Canada      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Capital losses 202 275  
United Kingdom      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Capital losses $ 0 $ 434