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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 3,910 $ 3,878
Unused tax losses for which a deferred tax asset has not been recognised 629 597
Capital tax losses for which no deferred tax asset recognised 27 26
Income tax expense (benefit) 1,040 461
Temporary differences associated with investments in subsidiaries, branches, joint ventures and associates for which a deferred tax liability has not been recognised $ 3,947 $ 4,606
Applicable tax rates 27.75% 27.80%
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) $ 98  
Losses available for carry forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Accumulated non-capital tax losses $ 3,205 $ 4,388
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 $ 10 9
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]    
Deferred tax assets 18 0
Capital losses $ 343 $ 202