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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ 2,998 $ 2,706
Acquisitions (disposals) through business combinations(3) (147) (226)
Charged to statement of operations 885 168
Charged to other comprehensive income (101) 304
Charged to equity, other than other comprehensive income (24) 15
Foreign exchange rate movements and Other (14) 31
Ending balance, deferred tax assets 3,597 2,998
Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 2,998 1,526
Ending balance, deferred tax assets   2,998
Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   1,180
Investments    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 516 (2,035)
Acquisitions (disposals) through business combinations(3) 13 1
Charged to statement of operations (564) 2,340
Charged to other comprehensive income (68) 202
Charged to equity, other than other comprehensive income 2 0
Foreign exchange rate movements and Other (1) 8
Ending balance, deferred tax assets (102) 516
Investments | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 516 (1,178)
Ending balance, deferred tax assets   516
Investments | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   (857)
Policy liabilities    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 1,716 3,764
Acquisitions (disposals) through business combinations(3) (9) 10
Charged to statement of operations 849 (2,153)
Charged to other comprehensive income (18) 85
Charged to equity, other than other comprehensive income (56) 0
Foreign exchange rate movements and Other (3) 10
Ending balance, deferred tax assets 2,479 1,716
Policy liabilities | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 1,716 1,727
Ending balance, deferred tax assets   1,716
Policy liabilities | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   2,037
Deferred acquisition costs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 84 74
Acquisitions (disposals) through business combinations(3) 0 0
Charged to statement of operations (5) 4
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (3) 6
Ending balance, deferred tax assets 76 84
Deferred acquisition costs | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 84 74
Ending balance, deferred tax assets   84
Deferred acquisition costs | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   0
Losses available for carry forward    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 986 853
Acquisitions (disposals) through business combinations(3) (42) 32
Charged to statement of operations 67 (10)
Charged to other comprehensive income (30) 92
Charged to equity, other than other comprehensive income 6 15
Foreign exchange rate movements and Other (11) 4
Ending balance, deferred tax assets 976 986
Losses available for carry forward | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 986 853
Ending balance, deferred tax assets   986
Losses available for carry forward | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   0
Pension and other employee benefits    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 242 301
Acquisitions (disposals) through business combinations(3) 8 8
Charged to statement of operations 49 (6)
Charged to other comprehensive income 38 (75)
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (10) 14
Ending balance, deferred tax assets 327 242
Pension and other employee benefits | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 242 301
Ending balance, deferred tax assets   242
Pension and other employee benefits | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   0
Other    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (546) (251)
Acquisitions (disposals) through business combinations(3) (117) (277)
Charged to statement of operations 489 (7)
Charged to other comprehensive income (23) 0
Charged to equity, other than other comprehensive income 24 0
Foreign exchange rate movements and Other 14 (11)
Ending balance, deferred tax assets (159) (546)
Other | Previously stated    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ (546) (251)
Ending balance, deferred tax assets   (546)
Other | Increase (decrease) due to changes in accounting policy required by IFRSs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets   $ 0