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Insurance and Reinsurance contract Assets and Liabilities - Reinsurance Contracts Held 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 remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance $ 42,651  
Opening reinsurance contract held liabilities, beginning balance (2,831)  
Effects of changes in non-performance risk of reinsurers 57 $ 15
Closing reinsurance contract held assets, ending balance 59,015 42,651
Reinsurance contracts held that are liabilities (2,669) (2,831)
Reinsurance contracts held    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 42,651 45,871
Opening reinsurance contract held liabilities, beginning balance (2,831) (2,391)
Net opening balance, beginning balance 39,820 43,480
Contracts initially recognized during the year 57 72
Effects of changes in non-performance risk of reinsurers (58) (14)
Effects of movements in foreign exchange rates (4,632) 1,098
Total changes in income and OCI (1,969) 1,086
Total cash flows 14,557 (2,574)
Net closing balance, ending balance 56,346 39,820
Closing reinsurance contract held assets, ending balance 59,015 42,651
Reinsurance contracts held that are liabilities (2,669) (2,831)
Reinsurance contracts held | PAA Estimates of PV of future cash flows    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Contracts initially recognized during the year 18,990 1,933
Reinsurance contracts held | PAA Risk adjustment for non-financial risk    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Contracts initially recognized during the year 1,261 399
Analysis by measurement components | Reinsurance contracts held    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 42,355 45,578
Opening reinsurance contract held liabilities, beginning balance (2,790) (2,346)
Opening PAA reinsurance contract net assets, beginning balance 255 248
Net opening balance, beginning balance 39,820 43,480
CSM recognized for services received (321) (164)
Change in risk adjustment for non-financial risk for risk expired (536) (478)
Experience adjustments (265) (19)
Changes that relate to current services (1,122) (661)
Contracts initially recognized during the year 57 72
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 142 (19)
Changes in estimates that adjust the CSM 0 0
Changes in estimates that relate to losses and reversal of losses on onerous contracts 172 23
Changes that relate to future services 371 76
Adjustments to liabilities for incurred claims 11 5
Changes that relate to past services 11 5
Insurance service result (740) (580)
Insurance finance (income) expenses from reinsurance contracts (1,842) 630
Effects of changes in non-performance risk of reinsurers (58) (14)
Effects of movements in foreign exchange rates 4,630 (1,097)
Total changes in income and OCI 1,990 (1,061)
Total cash flows 14,528 (2,606)
Change in PAA balance 8 7
Net closing balance, ending balance 56,346 39,820
Closing reinsurance contract held assets, ending balance 58,725 42,355
Reinsurance contracts held that are liabilities (2,642) (2,790)
Opening PAA reinsurance contract net assets, ending balance 263 255
Analysis by measurement components | Reinsurance contracts held | PAA Estimates of PV of future cash flows    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 38,156 39,656
Opening reinsurance contract held liabilities, beginning balance (4,384) (3,919)
Opening PAA reinsurance contract net assets, beginning balance 239 240
Net opening balance, beginning balance 34,011 35,977
CSM recognized for services received 0 0
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments (265) (19)
Changes that relate to current services (265) (19)
Contracts initially recognized during the year (1,826) (64)
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 0 0
Changes in estimates that adjust the CSM (1,577) 1,433
Changes in estimates that relate to losses and reversal of losses on onerous contracts 171 43
Changes that relate to future services (3,232) 1,412
Adjustments to liabilities for incurred claims 11 5
Changes that relate to past services 11 5
Insurance service result (3,486) 1,398
Insurance finance (income) expenses from reinsurance contracts (1,858) 173
Effects of changes in non-performance risk of reinsurers (58) (14)
Effects of movements in foreign exchange rates 4,069 (916)
Total changes in income and OCI (1,333) 641
Total cash flows 14,528 (2,606)
Change in PAA balance 10 (1)
Net closing balance, ending balance 47,216 34,011
Closing reinsurance contract held assets, ending balance 50,275 38,156
Reinsurance contracts held that are liabilities (3,308) (4,384)
Opening PAA reinsurance contract net assets, ending balance 249 239
Analysis by measurement components | Reinsurance contracts held | PAA Risk adjustment for non-financial risk    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 3,685 4,049
Opening reinsurance contract held liabilities, beginning balance 1,305 1,574
Opening PAA reinsurance contract net assets, beginning balance 16 8
Net opening balance, beginning balance 5,006 5,631
CSM recognized for services received 0 0
Change in risk adjustment for non-financial risk for risk expired (536) (478)
Experience adjustments 0 0
Changes that relate to current services (536) (478)
Contracts initially recognized during the year 1,261 399
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 0 0
Changes in estimates that adjust the CSM (290) (821)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 1 (20)
Changes that relate to future services 972 (442)
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 436 (920)
Insurance finance (income) expenses from reinsurance contracts (62) 447
Effects of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 411 (160)
Total changes in income and OCI 785 (633)
Total cash flows 0 0
Change in PAA balance (2) 8
Net closing balance, ending balance 5,789 5,006
Closing reinsurance contract held assets, ending balance 5,442 3,685
Reinsurance contracts held that are liabilities 333 1,305
Opening PAA reinsurance contract net assets, ending balance 14 16
Analysis by measurement components | Reinsurance contracts held | CSM, Fair value    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 565 1,774
Opening reinsurance contract held liabilities, beginning balance 116 (39)
Opening PAA reinsurance contract net assets, beginning balance 0 0
Net opening balance, beginning balance 681 1,735
CSM recognized for services received (62) (217)
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments 0 0
Changes that relate to current services (62) (217)
Contracts initially recognized during the year 2 0
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 110 (36)
Changes in estimates that adjust the CSM 1,657 (821)
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0 0
Changes that relate to future services 1,769 (857)
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 1,707 (1,074)
Insurance finance (income) expenses from reinsurance contracts 16 41
Effects of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 103 (21)
Total changes in income and OCI 1,826 (1,054)
Total cash flows 0 0
Change in PAA balance 0 0
Net closing balance, ending balance 2,507 681
Closing reinsurance contract held assets, ending balance 2,619 565
Reinsurance contracts held that are liabilities (112) 116
Opening PAA reinsurance contract net assets, ending balance 0 0
Analysis by measurement components | Reinsurance contracts held | CSM, Other    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance (51) 99
Opening reinsurance contract held liabilities, beginning balance 173 38
Opening PAA reinsurance contract net assets, beginning balance 0 0
Net opening balance, beginning balance 122 137
CSM recognized for services received (259) 53
Change in risk adjustment for non-financial risk for risk expired 0 0
Experience adjustments 0 0
Changes that relate to current services (259) 53
Contracts initially recognized during the year 620 (263)
Changes in recoveries of losses on onerous underlying contracts that adjust the CSM 32 17
Changes in estimates that adjust the CSM 210 209
Changes in estimates that relate to losses and reversal of losses on onerous contracts 0 0
Changes that relate to future services 862 (37)
Adjustments to liabilities for incurred claims 0 0
Changes that relate to past services 0 0
Insurance service result 603 16
Insurance finance (income) expenses from reinsurance contracts 62 (31)
Effects of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 47 0
Total changes in income and OCI 712 (15)
Total cash flows 0 0
Change in PAA balance 0 0
Net closing balance, ending balance 834 122
Closing reinsurance contract held assets, ending balance 389 (51)
Reinsurance contracts held that are liabilities 445 173
Opening PAA reinsurance contract net assets, ending balance $ 0 $ 0