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Risk Management - Summary of Potential Immediate Impact on Contractual Service Margin, Other Comprehensive Income to Shareholders, Total Comprehensive Income to Shareholders and MLI's LICAT Ratio from Changes to Public Equity Market Values (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
-30% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM $ (3,810) $ (3,410)
Impact of risk mitigation — hedging 1,150 1,200
Impact of risk mitigation — reinsurance 1,850 1,480
VA net of risk mitigation (810) (730)
General fund equity (940) (520)
Contractual service margin (1,750) (1,250)
Other comprehensive income attributed to shareholders (730) (620)
Total comprehensive income attributed to shareholders (1,920) (2,080)
-20% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM (2,370) (2,140)
Impact of risk mitigation — hedging 700 740
Impact of risk mitigation — reinsurance 1,140 930
VA net of risk mitigation (530) (470)
General fund equity (610) (370)
Contractual service margin (1,140) (840)
Other comprehensive income attributed to shareholders (490) (410)
Total comprehensive income attributed to shareholders (1,290) (1,330)
-10% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM (1,100) (1,010)
Impact of risk mitigation — hedging 310 340
Impact of risk mitigation — reinsurance 530 440
VA net of risk mitigation (260) (230)
General fund equity (300) (210)
Contractual service margin (560) (440)
Other comprehensive income attributed to shareholders (240) (210)
Total comprehensive income attributed to shareholders (640) (630)
+10% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM 940 890
Impact of risk mitigation — hedging (250) (280)
Impact of risk mitigation — reinsurance (450) (390)
VA net of risk mitigation 240 220
General fund equity 290 240
Contractual service margin 530 460
Other comprehensive income attributed to shareholders 230 210
Total comprehensive income attributed to shareholders 620 610
+20% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM 1,760 1,670
Impact of risk mitigation — hedging (450) (510)
Impact of risk mitigation — reinsurance (830) (730)
VA net of risk mitigation 480 430
General fund equity 590 490
Contractual service margin 1,070 920
Other comprehensive income attributed to shareholders 460 400
Total comprehensive income attributed to shareholders 1,240 1,180
+30% [member]    
Disclosure of potential immediate impact on contractual service margin other comprehensive income to shareholders total comprehensive income to shareholders and MLI LICAT ratio from changes to public equity market values [line items]    
Variable annuity guarantees reported in CSM 2,470 2,360
Impact of risk mitigation — hedging (600) (690)
Impact of risk mitigation — reinsurance (1,150) (1,030)
VA net of risk mitigation 720 640
General fund equity 870 730
Contractual service margin 1,590 1,370
Other comprehensive income attributed to shareholders 680 600
Total comprehensive income attributed to shareholders $ 1,840 $ 1,780