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Insurance and Reinsurance contract Assets and Liabilities - Summary of Insurance Contracts in Analysis by Measurement Components (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets $ 673  
Opening insurance contract liabilities 354,849  
Insurance finance (income) expenses (14,628) $ (6,307)
Acquisition cash flows incurred in the year 820 805
Closing insurance contract assets 145 673
Closing insurance contract liabilities 367,996 354,849
Insurance Contracts Issued [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets (673) (972)
Opening insurance contract liabilities 354,849 405,621
Opening insurance contract liabilities for account of segregated fund holders 110,216 130,836
Net opening balance 464,392 535,485
Changes that relate to future services 90 742
Changes that relate to past services (1,878) (1,948)
Insurance service result (4,590) (3,783)
Insurance finance (income) expenses 25,174 (68,833)
Effects of movements in foreign exchange rates (9,771) 16,061
Total changes in income and OCI 10,813 (56,555)
Total cash flows 3,036 6,274
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year (174) (192)
Change in PAA balance 481,994 464,392
Movements related to insurance contract liabilities for account of segregated fund holders 3,927 (20,620)
Closing insurance contract assets (145) (673)
Closing insurance contract liabilities 367,996 354,849
Closing insurance contract liabilities for account of segregated fund holders 114,143 110,216
Net closing balance 481,994 464,392
Insurance finance (income) expenses, per disclosure in note 7 (f) 24,992 (68,833)
Insurance Contracts Issued [Member] | Cash flow hedges [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative 3 0
Insurance Contracts Issued [Member] | Fair value hedges [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative (185) 0
Insurance Contracts Issued [Member] | Assets for insurance acquisition cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets (9)  
Opening insurance contract liabilities (796)  
Net opening balance (805)  
Closing insurance contract assets   (9)
Closing insurance contract liabilities (820) (796)
Net closing balance (820) (805)
Analysis by measurement components [Member] | Insurance Contracts Issued [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets (658) (958)
Opening insurance contract liabilities 342,853 392,685
Opening PAA insurance contract net liabilities 11,981 12,922
Opening insurance contract liabilities for account of segregated fund holders 110,216 130,836
Net opening balance 464,392 535,485
CSM recognized for services provided (2,162) (2,298)
Change in risk adjustment for non-financial risk for risk expired (1,620) (1,582)
Experience adjustments 152 6
Changes that relate to current services (3,630) (3,874)
Contracts initially recognized during the year 253 514
Changes in estimates that adjust the CSM 0  
Changes in estimates that relate to losses and reversal of losses on onerous contracts (162) 227
Changes that relate to future services 91 741
Adjustments to liabilities for incurred claims (32) (40)
Changes that relate to past services (32) (40)
Insurance service result (3,571) (3,173)
Insurance finance (income) expenses 24,306 (67,575)
Effects of movements in foreign exchange rates (9,729) 16,033
Total changes in income and OCI 11,006 (54,715)
Total cash flows 2,081 5,190
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0  
Acquisition cash flows incurred in the year (8) (7)
Change in PAA balance 596 (941)
Movements related to insurance contract liabilities for account of segregated fund holders 3,927 (20,620)
Net closing balance 481,994 464,392
Closing insurance contract assets (144) (658)
Closing insurance contract liabilities 355,418 342,853
Closing PAA insurance contract net liabilities 12,577 11,981
Closing insurance contract liabilities for account of segregated fund holders 114,143 110,216
Net closing balance 481,994 464,392
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | PAA [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance finance (income) expenses 868 (1,258)
Insurance finance (income) expenses, per disclosure in note 7 (f) 24,992 (68,833)
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Cash flow hedges [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative 3  
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Cash flow hedges [Member] | PAA [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative 0  
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Fair value hedges [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative (120)  
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Fair value hedges [Member] | PAA [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Reclassification of derivative (65)  
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Estimates of PV of future cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets (1,827) (1,955)
Opening insurance contract liabilities 297,967 341,125
Opening PAA insurance contract net liabilities 12,125 12,919
Opening insurance contract liabilities for account of segregated fund holders 110,216 130,836
Net opening balance 418,481 482,925
CSM recognized for services provided 0  
Change in risk adjustment for non-financial risk for risk expired 0  
Experience adjustments 152 6
Changes that relate to current services 152 6
Contracts initially recognized during the year (3,295) (2,880)
Changes in estimates that adjust the CSM 1,585 3,377
Changes in estimates that relate to losses and reversal of losses on onerous contracts (174) 229
Changes that relate to future services (1,884) 726
Adjustments to liabilities for incurred claims (28) (33)
Changes that relate to past services (28) (33)
Insurance service result (1,760) 699
Insurance finance (income) expenses 22,340 (62,812)
Effects of movements in foreign exchange rates (8,405) 13,898
Total changes in income and OCI 12,175 (48,215)
Total cash flows 2,081 5,190
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts (5) (5)
Acquisition cash flows incurred in the year 0  
Change in PAA balance 587 (794)
Movements related to insurance contract liabilities for account of segregated fund holders 3,927 (20,620)
Net closing balance 437,246 418,481
Closing insurance contract assets (416) (1,827)
Closing insurance contract liabilities 310,807 297,967
Closing PAA insurance contract net liabilities 12,712 12,125
Closing insurance contract liabilities for account of segregated fund holders 114,143 110,216
Net closing balance 437,246 418,481
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Risk adjustment for non-financial risk [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets 512 365
Opening insurance contract liabilities 25,750 30,780
Opening PAA insurance contract net liabilities 605 694
Opening insurance contract liabilities for account of segregated fund holders 0  
Net opening balance 26,867 31,839
CSM recognized for services provided 0  
Change in risk adjustment for non-financial risk for risk expired (1,620) (1,582)
Experience adjustments 0  
Changes that relate to current services (1,620) (1,582)
Contracts initially recognized during the year 1,180 1,396
Changes in estimates that adjust the CSM (3,859) (994)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 12 (2)
Changes that relate to future services (2,667) 400
Adjustments to liabilities for incurred claims (4) (7)
Changes that relate to past services (4) (7)
Insurance service result (4,291) (1,189)
Insurance finance (income) expenses 1,646 (5,105)
Effects of movements in foreign exchange rates (779) 1,411
Total changes in income and OCI (3,424) (4,883)
Total cash flows 0  
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0  
Acquisition cash flows incurred in the year 0  
Change in PAA balance 21 (89)
Movements related to insurance contract liabilities for account of segregated fund holders 0  
Net closing balance 23,464 26,867
Closing insurance contract assets 141 512
Closing insurance contract liabilities 22,697 25,750
Closing PAA insurance contract net liabilities 626 605
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 23,464 26,867
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | CSM Fair value [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets 100 179
Opening insurance contract liabilities 17,105 19,842
Opening PAA insurance contract net liabilities 0  
Opening insurance contract liabilities for account of segregated fund holders 0  
Net opening balance 17,205 20,021
CSM recognized for services provided (1,812) (2,064)
Change in risk adjustment for non-financial risk for risk expired 0  
Experience adjustments 0  
Changes that relate to current services (1,812) (2,064)
Contracts initially recognized during the year 0 35
Changes in estimates that adjust the CSM 2,214 (1,737)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0  
Changes that relate to future services 2,214 (1,702)
Adjustments to liabilities for incurred claims 0  
Changes that relate to past services 0  
Insurance service result 402 (3,766)
Insurance finance (income) expenses 244 311
Effects of movements in foreign exchange rates (438) 639
Total changes in income and OCI 208 (2,816)
Total cash flows 0  
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0  
Acquisition cash flows incurred in the year 0  
Change in PAA balance 0  
Movements related to insurance contract liabilities for account of segregated fund holders 0  
Net closing balance 17,413 17,205
Closing insurance contract assets 32 100
Closing insurance contract liabilities 17,381 17,105
Closing PAA insurance contract net liabilities 0 0
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 17,413 17,205
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | CSM Other [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets 557 453
Opening insurance contract liabilities 2,087 992
Opening PAA insurance contract net liabilities 0  
Opening insurance contract liabilities for account of segregated fund holders 0  
Net opening balance 2,644 1,445
CSM recognized for services provided (350) (234)
Change in risk adjustment for non-financial risk for risk expired 0  
Experience adjustments 0  
Changes that relate to current services (350) (234)
Contracts initially recognized during the year 2,368 1,963
Changes in estimates that adjust the CSM 60 (646)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0  
Changes that relate to future services 2,428 1,317
Adjustments to liabilities for incurred claims 0  
Changes that relate to past services 0  
Insurance service result 2,078 1,083
Insurance finance (income) expenses 76 31
Effects of movements in foreign exchange rates (107) 85
Total changes in income and OCI 2,047 1,199
Total cash flows 0  
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0  
Acquisition cash flows incurred in the year 0  
Change in PAA balance 0  
Movements related to insurance contract liabilities for account of segregated fund holders 0  
Net closing balance 4,691 2,644
Closing insurance contract assets 99 557
Closing insurance contract liabilities 4,592 2,087
Closing PAA insurance contract net liabilities 0 0
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 4,691 2,644
Analysis by measurement components [Member] | Insurance Contracts Issued [Member] | Assets for insurance acquisition cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Opening insurance contract assets 0  
Opening insurance contract liabilities (56) (54)
Opening PAA insurance contract net liabilities (749) (691)
Opening insurance contract liabilities for account of segregated fund holders 0  
Net opening balance (805) (745)
CSM recognized for services provided 0  
Change in risk adjustment for non-financial risk for risk expired 0  
Experience adjustments 0  
Changes that relate to current services 0  
Contracts initially recognized during the year 0  
Changes in estimates that adjust the CSM 0  
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0  
Changes that relate to future services 0  
Adjustments to liabilities for incurred claims 0  
Changes that relate to past services 0  
Insurance service result 0  
Insurance finance (income) expenses 0  
Effects of movements in foreign exchange rates 0  
Total changes in income and OCI 0  
Total cash flows 0  
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 5 5
Acquisition cash flows incurred in the year (8) (7)
Change in PAA balance (12) (58)
Movements related to insurance contract liabilities for account of segregated fund holders 0  
Net closing balance (820) (805)
Closing insurance contract assets 0 0
Closing insurance contract liabilities (59) (56)
Closing PAA insurance contract net liabilities (761) (749)
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance $ (820) $ (805)