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Insurance and Reinsurance contract Assets and Liabilities - Summary of Reinsurance Contracts Held 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 remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets $ 45,871  
Opening reinsurance contract held liabilities 2,391  
Closing reinsurance contract held assets 42,651 $ 45,871
Closing reinsurance contract held liabilities 2,831 2,391
Reinsurance contracts held [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 45,871 52,829
Opening reinsurance contract held liabilities (2,391) (2,079)
Net opening balance 43,480 50,750
Contracts initially recognized during the year 72 151
Effects of changes in non-performance risk of reinsurers (14) 97
Effects of movements in foreign exchange rates (1,098) 3,146
Total changes in income and OCI (1,086) (6,516)
Total cash flows (2,574) (754)
Change in PAA balance 39,820 43,480
Closing reinsurance contract held assets 42,651 45,871
Closing reinsurance contract held liabilities (2,831) (2,391)
Net closing balance 39,820 43,480
Reinsurance contracts held [member] | Estimates of PV of future cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contracts initially recognized during the year 1,933 6,618
Reinsurance contracts held [member] | Risk adjustment for non-financial risk [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contracts initially recognized during the year 399 717
Analysis by measurement components [Member] | Reinsurance contracts held [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 45,578 52,513
Opening reinsurance contract held liabilities (2,346) (2,052)
Opening Balance, PAA reinsurance contract net assets 248 289
Net opening balance 43,480 50,750
CSM recognized for services received (164) (305)
Change in risk adjustment for non-financial risk for risk expired (478) (424)
Experience adjustments (19) 9
Changes that relate to current services (661) (720)
Contracts initially recognized during the year 72 151
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM (19) (65)
Changes in estimates that adjust the CSM   0
Changes in estimates that relate to losses and reversal of losses on onerous contracts 23 46
Changes that relate to future services 76 132
Adjustments to liabilities for incurred claims 5 3
Changes that relate to past services 5 3
Insurance service result (580) (585)
Insurance finance (income) expenses from reinsurance contracts 630 (9,136)
Effects of changes in non-performance risk of reinsurers (14) 97
Effects of movements in foreign exchange rates (1,097) 3,145
Total changes in income and OCI (1,061) (6,479)
Total cash flows (2,606) (750)
Change in PAA balance 7 (41)
Closing reinsurance contract held assets 42,355 45,578
Closing reinsurance contract held liabilities (2,790) (2,346)
Closing Balance, PAA reinsurance contract net assets 255 248
Net closing balance 39,820 43,480
Analysis by measurement components [Member] | Reinsurance contracts held [member] | Estimates of PV of future cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 39,656 46,025
Opening reinsurance contract held liabilities (3,919) (5,138)
Opening Balance, PAA reinsurance contract net assets 240 281
Net opening balance 35,977 41,168
CSM recognized for services received   0
Change in risk adjustment for non-financial risk for risk expired   0
Experience adjustments (19) 9
Changes that relate to current services (19) 9
Contracts initially recognized during the year (64) (1,276)
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM   0
Changes in estimates that adjust the CSM 1,433 1,337
Changes in estimates that relate to losses and reversal of losses on onerous contracts 43 106
Changes that relate to future services 1,412 167
Adjustments to liabilities for incurred claims 5 3
Changes that relate to past services 5 3
Insurance service result 1,398 179
Insurance finance (income) expenses from reinsurance contracts 173 (7,463)
Effects of changes in non-performance risk of reinsurers (14) 97
Effects of movements in foreign exchange rates (916) 2,787
Total changes in income and OCI 641 (4,400)
Total cash flows (2,606) (750)
Change in PAA balance (1) (41)
Closing reinsurance contract held assets 38,156 39,656
Closing reinsurance contract held liabilities (4,384) (3,919)
Closing Balance, PAA reinsurance contract net assets 239 240
Net closing balance 34,011 35,977
Analysis by measurement components [Member] | Reinsurance contracts held [member] | Risk adjustment for non-financial risk [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 4,049 4,977
Opening reinsurance contract held liabilities 1,574 1,719
Opening Balance, PAA reinsurance contract net assets 8 8
Net opening balance 5,631 6,704
CSM recognized for services received   0
Change in risk adjustment for non-financial risk for risk expired (478) (424)
Experience adjustments 0 0
Changes that relate to current services (478) (424)
Contracts initially recognized during the year 399 717
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM   0
Changes in estimates that adjust the CSM (821) 173
Changes in estimates that relate to losses and reversal of losses on onerous contracts (20) (60)
Changes that relate to future services (442) 830
Adjustments to liabilities for incurred claims   0
Changes that relate to past services   0
Insurance service result (920) 406
Insurance finance (income) expenses from reinsurance contracts 447 (1,715)
Effects of changes in non-performance risk of reinsurers   0
Effects of movements in foreign exchange rates (160) 236
Total changes in income and OCI (633) (1,073)
Total cash flows   0
Change in PAA balance 8 0
Closing reinsurance contract held assets 3,685 4,049
Closing reinsurance contract held liabilities 1,305 1,574
Closing Balance, PAA reinsurance contract net assets 16 8
Net closing balance 5,006 5,631
Analysis by measurement components [Member] | Reinsurance contracts held [member] | CSM Fair value [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 1,774 2,012
Opening reinsurance contract held liabilities (39) 1,262
Opening Balance, PAA reinsurance contract net assets 0 0
Net opening balance 1,735 3,274
CSM recognized for services received (217) (231)
Change in risk adjustment for non-financial risk for risk expired   0
Experience adjustments   0
Changes that relate to current services (217) (231)
Contracts initially recognized during the year   (7)
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM (36) (15)
Changes in estimates that adjust the CSM (821) (1,440)
Changes in estimates that relate to losses and reversal of losses on onerous contracts   0
Changes that relate to future services (857) (1,462)
Adjustments to liabilities for incurred claims   0
Changes that relate to past services   0
Insurance service result (1,074) (1,693)
Insurance finance (income) expenses from reinsurance contracts 41 56
Effects of changes in non-performance risk of reinsurers   0
Effects of movements in foreign exchange rates (21) 98
Total changes in income and OCI (1,054) (1,539)
Total cash flows   0
Change in PAA balance   0
Closing reinsurance contract held assets 565 1,774
Closing reinsurance contract held liabilities 116 (39)
Closing Balance, PAA reinsurance contract net assets   0
Net closing balance 681 1,735
Analysis by measurement components [Member] | Reinsurance contracts held [member] | CSM Other [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 99 (501)
Opening reinsurance contract held liabilities 38 105
Opening Balance, PAA reinsurance contract net assets 0 0
Net opening balance 137 (396)
CSM recognized for services received 53 (74)
Change in risk adjustment for non-financial risk for risk expired   0
Experience adjustments   0
Changes that relate to current services 53 (74)
Contracts initially recognized during the year (263) 717
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 17 (50)
Changes in estimates that adjust the CSM 209 (70)
Changes in estimates that relate to losses and reversal of losses on onerous contracts   0
Changes that relate to future services (37) 597
Adjustments to liabilities for incurred claims   0
Changes that relate to past services   0
Insurance service result 16 523
Insurance finance (income) expenses from reinsurance contracts (31) (14)
Effects of changes in non-performance risk of reinsurers   0
Effects of movements in foreign exchange rates   24
Total changes in income and OCI (15) 533
Total cash flows   0
Change in PAA balance   0
Closing reinsurance contract held assets (51) 99
Closing reinsurance contract held liabilities 173 38
Closing Balance, PAA reinsurance contract net assets   0
Net closing balance $ 122 $ 137