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Risk Management - Potential Immediate Impact on Contractual Service Margin, Other Comprehensive Income to Shareholders and Total Comprehensive Income to Shareholders (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]    
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability 95.00% 95.00%
-30%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM $ (3,420) $ (3,810)
Impact of risk mitigation - hedging 940 1,150
Impact of risk mitigation - reinsurance 1,670 1,850
VA net of risk mitigation (810) (810)
General fund equity (1,140) (940)
Contractual service margin (pre-tax) (1,950) (1,750)
Other comprehensive income attributed to shareholders (post-tax) (840) (730)
Total comprehensive income attributed to shareholders (post-tax) (2,090) (1,920)
-20%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM (2,110) (2,370)
Impact of risk mitigation - hedging 560 700
Impact of risk mitigation - reinsurance 1,020 1,140
VA net of risk mitigation (530) (530)
General fund equity (740) (610)
Contractual service margin (pre-tax) (1,270) (1,140)
Other comprehensive income attributed to shareholders (post-tax) (560) (490)
Total comprehensive income attributed to shareholders (post-tax) (1,380) (1,290)
-10%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM (970) (1,100)
Impact of risk mitigation - hedging 250 310
Impact of risk mitigation - reinsurance 470 530
VA net of risk mitigation (250) (260)
General fund equity (370) (300)
Contractual service margin (pre-tax) (620) (560)
Other comprehensive income attributed to shareholders (post-tax) (280) (240)
Total comprehensive income attributed to shareholders (post-tax) (680) (640)
+10%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM 840 940
Impact of risk mitigation - hedging (190) (250)
Impact of risk mitigation - reinsurance (400) (450)
VA net of risk mitigation 250 240
General fund equity 370 290
Contractual service margin (pre-tax) 620 530
Other comprehensive income attributed to shareholders (post-tax) 270 230
Total comprehensive income attributed to shareholders (post-tax) 660 620
+20%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM 1,580 1,760
Impact of risk mitigation - hedging (350) (450)
Impact of risk mitigation - reinsurance (740) (830)
VA net of risk mitigation 490 480
General fund equity 750 590
Contractual service margin (pre-tax) 1,240 1,070
Other comprehensive income attributed to shareholders (post-tax) 530 460
Total comprehensive income attributed to shareholders (post-tax) 1,320 1,240
+30%    
Disclosure of credit risk exposure [line items]    
Variable annuity and segregated fund guarantees reported in CSM 2,250 2,470
Impact of risk mitigation - hedging (470) (600)
Impact of risk mitigation - reinsurance (1,050) (1,150)
VA net of risk mitigation 730 720
General fund equity 1,110 870
Contractual service margin (pre-tax) 1,840 1,590
Other comprehensive income attributed to shareholders (post-tax) 790 680
Total comprehensive income attributed to shareholders (post-tax) $ 1,970 $ 1,840