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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

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