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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   $ 2,998
Acquisitions (disposals) through business combinations $ 1 (147)
Charged to statement of operations (63) 885
Charged to other comprehensive income (41) (101)
Charged to equity, other than other comprehensive income 94 (24)
Foreign exchange rate movements and Other 36 (14)
Ending balance, deferred tax assets 3,624  
Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 3,597  
Ending balance, deferred tax assets   3,597
Investments    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   516
Acquisitions (disposals) through business combinations 0 13
Charged to statement of operations (101) (564)
Charged to other comprehensive income 2 (68)
Charged to equity, other than other comprehensive income 84 2
Foreign exchange rate movements and Other (6) (1)
Ending balance, deferred tax assets (123)  
Investments | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (102)  
Ending balance, deferred tax assets   (102)
Policy liabilities    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   1,716
Acquisitions (disposals) through business combinations 0 (9)
Charged to statement of operations 193 849
Charged to other comprehensive income 0 (18)
Charged to equity, other than other comprehensive income 0 (56)
Foreign exchange rate movements and Other 5 (3)
Ending balance, deferred tax assets 2,677  
Policy liabilities | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 2,479  
Ending balance, deferred tax assets   2,479
Deferred acquisition costs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   84
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations 7 (5)
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other 6 (3)
Ending balance, deferred tax assets 89  
Deferred acquisition costs | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 76  
Ending balance, deferred tax assets   76
Losses available for carry forward    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   986
Acquisitions (disposals) through business combinations (7) (42)
Charged to statement of operations (296) 67
Charged to other comprehensive income (31) (30)
Charged to equity, other than other comprehensive income 10 6
Foreign exchange rate movements and Other (1) (11)
Ending balance, deferred tax assets 651  
Losses available for carry forward | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 976  
Ending balance, deferred tax assets   976
Pension and other employee benefits    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   242
Acquisitions (disposals) through business combinations 0 8
Charged to statement of operations 11 49
Charged to other comprehensive income (7) 38
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other 24 (10)
Ending balance, deferred tax assets 355  
Pension and other employee benefits | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 327  
Ending balance, deferred tax assets   327
Other    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   (546)
Acquisitions (disposals) through business combinations 8 (117)
Charged to statement of operations 123 489
Charged to other comprehensive income (5) (23)
Charged to equity, other than other comprehensive income 0 24
Foreign exchange rate movements and Other 8 14
Ending balance, deferred tax assets (25)  
Other | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ (159)  
Ending balance, deferred tax assets   $ (159)