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Insurance and Reinsurance contract Assets and Liabilities - Insurance Contracts in Analysis by Measurement Components (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance $ (145)  
Opening insurance contract liabilities, beginning balance 367,996  
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 114,143  
Acquisition cash flows incurred in the year (878) $ (820)
Closing insurance contract assets, ending balance (102) (145)
Closing insurance contract liabilities, ending balance 396,401 367,996
Closing insurance contract liabilities for account of segregated fund holders, ending balance 126,545 114,143
Insurance contracts issued    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance (145) (673)
Opening insurance contract liabilities, beginning balance 367,996 354,849
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 114,143 110,216
Net opening balance, beginning balance 481,994 464,392
Changes that relate to future services 882 90
Changes that relate to past services (2,605) (1,878)
Insurance service result (4,770) (4,590)
Insurance finance (income) expenses 3,337 25,174
Effects of movements in foreign exchange rates 25,357 (9,771)
Total changes in income and OCI 23,924 10,813
Total cash flows 4,717 3,036
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year (193) (174)
Movements related to insurance contract liabilities for account of segregated fund holders 12,402 3,927
Net closing balance, ending balance 522,844 481,994
Closing insurance contract assets, ending balance (102) (145)
Closing insurance contract liabilities, ending balance 396,401 367,996
Closing insurance contract liabilities for account of segregated fund holders, ending balance 126,545 114,143
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 3,337 25,174
Insurance finance (income) expenses, per disclosure in note 6 (f) (6,631) (24,992)
Insurance contracts issued | Cash flow hedges    
Insurance finance (income) expenses    
Reclassification of derivative (52) 3
Insurance contracts issued | Fair value hedges    
Insurance finance (income) expenses    
Reclassification of derivative 3,346 (185)
Insurance contracts issued | CSM, Fair value    
Changes in insurance contracts for reconciliation by components [abstract]    
Net opening balance, beginning balance 17,413  
Net closing balance, ending balance 19,007 17,413
Insurance contracts issued | Assets for insurance acquisition cash flows    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance 0  
Opening insurance contract liabilities, beginning balance (820)  
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 0  
Net opening balance, beginning balance (820)  
Net closing balance, ending balance (878) (820)
Closing insurance contract assets, ending balance (11) 0
Closing insurance contract liabilities, ending balance (867) (820)
Closing insurance contract liabilities for account of segregated fund holders, ending balance 0 0
Analysis by measurement components | Insurance contracts issued    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance (144) (658)
Opening insurance contract liabilities, beginning balance 355,418 342,853
Opening PAA insurance contract net liabilities, beginning balance 12,577 11,981
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 114,143 110,216
Net opening balance, beginning balance 481,994 464,392
CSM recognized for services provided (2,697) (2,162)
Change in risk adjustment for non-financial risk for risk expired (1,430) (1,620)
Experience adjustments (532) 152
Changes that relate to current services (4,659) (3,630)
Contracts initially recognized during the year 104 253
Changes in estimates that adjust the CSM 0 0
Changes in estimates that relate to losses and reversal of losses on onerous contracts 777 (162)
Changes that relate to future services 881 91
Adjustments to liabilities for incurred claims (12) (32)
Changes that relate to past services (12) (32)
Insurance service result (3,790) (3,571)
Insurance finance (income) expenses 2,612 24,306
Effects of movements in foreign exchange rates 25,296 (9,729)
Total changes in income and OCI 24,118 11,006
Total cash flows 3,840 2,081
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year (8) (8)
Change in PAA balance 498 596
Movements related to insurance contract liabilities for account of segregated fund holders 12,402 3,927
Net closing balance, ending balance 522,844 481,994
Closing insurance contract assets, ending balance (98) (144)
Closing insurance contract liabilities, ending balance 383,322 355,418
Closing PAA insurance contract net liabilities, ending balance 13,075 12,577
Closing insurance contract liabilities for account of segregated fund holders, ending balance 126,545 114,143
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 2,612 24,306
Analysis by measurement components | Insurance contracts issued | PAA    
Changes in insurance contracts for reconciliation by components [abstract]    
Insurance finance (income) expenses 725 868
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 725 868
Insurance finance (income) expenses, per disclosure in note 6 (f) 6,631 24,992
Analysis by measurement components | Insurance contracts issued | Cash flow hedges    
Insurance finance (income) expenses    
Reclassification of derivative (52) 3
Analysis by measurement components | Insurance contracts issued | Cash flow hedges | PAA    
Insurance finance (income) expenses    
Reclassification of derivative 0 0
Analysis by measurement components | Insurance contracts issued | Fair value hedges    
Insurance finance (income) expenses    
Reclassification of derivative 3,333 (120)
Analysis by measurement components | Insurance contracts issued | Fair value hedges | PAA    
Insurance finance (income) expenses    
Reclassification of derivative 13 (65)
Analysis by measurement components | Insurance contracts issued | Estimates of PV of future cash flows    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance (416) (1,827)
Opening insurance contract liabilities, beginning balance 310,807 297,967
Opening PAA insurance contract net liabilities, beginning balance 12,712 12,125
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 114,143 110,216
Net opening balance, beginning balance 437,246 418,481
CSM recognized for services provided 0 0
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments (532) 152
Changes that relate to current services (532) 152
Contracts initially recognized during the year (4,043) (3,295)
Changes in estimates that adjust the CSM (459) 1,585
Changes in estimates that relate to losses and reversal of losses on onerous contracts 770 (174)
Changes that relate to future services (3,732) (1,884)
Adjustments to liabilities for incurred claims (8) (28)
Changes that relate to past services (8) (28)
Insurance service result (4,272) (1,760)
Insurance finance (income) expenses 2,317 22,340
Effects of movements in foreign exchange rates 21,946 (8,405)
Total changes in income and OCI 19,991 12,175
Total cash flows 3,840 2,081
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts (6) (5)
Acquisition cash flows incurred in the year 0 0
Change in PAA balance 489 587
Movements related to insurance contract liabilities for account of segregated fund holders 12,402 3,927
Net closing balance, ending balance 473,962 437,246
Closing insurance contract assets, ending balance (490) (416)
Closing insurance contract liabilities, ending balance 334,706 310,807
Closing PAA insurance contract net liabilities, ending balance 13,201 12,712
Closing insurance contract liabilities for account of segregated fund holders, ending balance 126,545 114,143
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 2,317 22,340
Analysis by measurement components | Insurance contracts issued | Risk adjustment for non-financial risk    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance 141 512
Opening insurance contract liabilities, beginning balance 22,697 25,750
Opening PAA insurance contract net liabilities, beginning balance 626 605
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 0 0
Net opening balance, beginning balance 23,464 26,867
CSM recognized for services provided 0 0
Change in risk adjustment for non-financial risk for risk expired (1,430) (1,620)
Experience adjustments 0 0
Changes that relate to current services (1,430) (1,620)
Contracts initially recognized during the year 952 1,180
Changes in estimates that adjust the CSM (1,866) (3,859)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 7 12
Changes that relate to future services (907) (2,667)
Adjustments to liabilities for incurred claims (4) (4)
Changes that relate to past services (4) (4)
Insurance service result (2,341) (4,291)
Insurance finance (income) expenses (59) 1,646
Effects of movements in foreign exchange rates 1,866 (779)
Total changes in income and OCI (534) (3,424)
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Change in PAA balance 65 21
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance, ending balance 22,995 23,464
Closing insurance contract assets, ending balance 144 141
Closing insurance contract liabilities, ending balance 22,160 22,697
Closing PAA insurance contract net liabilities, ending balance 691 626
Closing insurance contract liabilities for account of segregated fund holders, ending balance 0 0
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above (59) 1,646
Analysis by measurement components | Insurance contracts issued | CSM, Fair value    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance 32 100
Opening insurance contract liabilities, beginning balance 17,381 17,105
Opening PAA insurance contract net liabilities, beginning balance 0 0
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 0 0
Net opening balance, beginning balance 17,413 17,205
CSM recognized for services provided (2,097) (1,812)
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments 0 0
Changes that relate to current services (2,097) (1,812)
Contracts initially recognized during the year 2 0
Changes in estimates that adjust the CSM 2,388 2,214
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0 0
Changes that relate to future services 2,390 2,214
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 293 402
Insurance finance (income) expenses 233 244
Effects of movements in foreign exchange rates 1,068 (438)
Total changes in income and OCI 1,594 208
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Change in PAA balance 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance, ending balance 19,007 17,413
Closing insurance contract assets, ending balance 100 32
Closing insurance contract liabilities, ending balance 18,907 17,381
Closing PAA insurance contract net liabilities, ending balance 0 0
Closing insurance contract liabilities for account of segregated fund holders, ending balance 0 0
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 233 244
Analysis by measurement components | Insurance contracts issued | CSM, Other    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance 99 557
Opening insurance contract liabilities, beginning balance 4,592 2,087
Opening PAA insurance contract net liabilities, beginning balance 0 0
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 0 0
Net opening balance, beginning balance 4,691 2,644
CSM recognized for services provided (600) (350)
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments 0 0
Changes that relate to current services (600) (350)
Contracts initially recognized during the year 3,193 2,368
Changes in estimates that adjust the CSM (63) 60
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0 0
Changes that relate to future services 3,130 2,428
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 2,530 2,078
Insurance finance (income) expenses 121 76
Effects of movements in foreign exchange rates 416 (107)
Total changes in income and OCI 3,067 2,047
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Change in PAA balance 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance, ending balance 7,758 4,691
Closing insurance contract assets, ending balance 148 99
Closing insurance contract liabilities, ending balance 7,610 4,592
Closing PAA insurance contract net liabilities, ending balance 0 0
Closing insurance contract liabilities for account of segregated fund holders, ending balance 0 0
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above 121 76
Analysis by measurement components | Insurance contracts issued | Assets for insurance acquisition cash flows    
Changes in insurance contracts for reconciliation by components [abstract]    
Opening insurance contract assets, beginning balance 0 0
Opening insurance contract liabilities, beginning balance (59) (56)
Opening PAA insurance contract net liabilities, beginning balance (761) (749)
Opening insurance contract liabilities for account of segregated fund holders, beginning balance 0 0
Net opening balance, beginning balance (820) (805)
CSM recognized for services provided 0 0
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments 0 0
Changes that relate to current services 0 0
Contracts initially recognized during the year 0 0
Changes in estimates that adjust the CSM 0 0
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0 0
Changes that relate to future services 0 0
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 0 0
Insurance finance (income) expenses 0 0
Effects of movements in foreign exchange rates 0 0
Total changes in income and OCI 0 0
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 6 5
Acquisition cash flows incurred in the year (8) (8)
Change in PAA balance (56) (12)
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance, ending balance (878) (820)
Closing insurance contract assets, ending balance 0 0
Closing insurance contract liabilities, ending balance (61) (59)
Closing PAA insurance contract net liabilities, ending balance (817) (761)
Closing insurance contract liabilities for account of segregated fund holders, ending balance 0 0
Insurance finance (income) expenses    
Insurance finance (income) expenses, per disclosure above $ 0 $ 0