v3.25.4
Insurance and Reinsurance contract Assets and Liabilities - Reinsurance Contracts Held in Analysis by Remaining Coverage and Incurred Claims (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance $ 59,015  
Opening reinsurance contract held liabilities, beginning balance (2,669)  
Amounts recoverable from reinsurers    
Net expenses from reinsurance contracts (1,271) $ (769)
Effect of changes in non-performance risk of reinsurers (12) 57
Cash flows    
Closing reinsurance contract held assets, ending balance 60,881 59,015
Reinsurance contracts held that are liabilities (3,273) (2,669)
Reinsurance contracts held    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 59,015 42,651
Opening reinsurance contract held liabilities, beginning balance (2,669) (2,831)
Net opening balance, beginning balance 56,346 39,820
Changes in income and OCI    
Allocation of reinsurance premium paid (8,451) (7,709)
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 6,979 6,578
Recoveries and reversals of recoveries of losses on onerous underlying contracts 187 372
Adjustments to assets for incurred claims 14 (10)
Insurance service result (1,271) (769)
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts (1,271) (769)
Net finance (income) expenses from reinsurance contracts 2,755 (1,836)
Effect of changes in non-performance risk of reinsurers 12 (58)
Effects of movements in foreign exchange rates (2,993) 4,632
Contracts measured under PAA 0 0
Total changes in income and OCI (1,497) 1,969
Cash flows    
Premiums paid(1) 11,915 23,130
Amounts received (9,156) (8,573)
Total cash flows 2,759 14,557
Net closing balance, ending balance 57,608 56,346
Closing reinsurance contract held assets, ending balance 60,881 59,015
Reinsurance contracts held that are liabilities (3,273) (2,669)
Reinsurance contract held assets from reinsurance transactions 5,200 18,600
Reinsurance contracts held | Liabilities for remaining coverage, excluding loss component    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 50,723 35,079
Opening reinsurance contract held liabilities, beginning balance (2,692) (2,634)
Net opening balance, beginning balance 48,031 32,445
Changes in income and OCI    
Allocation of reinsurance premium paid (8,451) (7,709)
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 0 0
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims 0 0
Insurance service result (8,451) (7,709)
Investment components and premium refunds (1,815) 1,939
Net expenses from reinsurance contracts (10,266) (9,648)
Net finance (income) expenses from reinsurance contracts 2,912 (1,859)
Effect of changes in non-performance risk of reinsurers 12 (58)
Effects of movements in foreign exchange rates (2,650) 4,021
Contracts measured under PAA 0 0
Total changes in income and OCI (9,992) (7,544)
Cash flows    
Premiums paid(1) 11,915 23,130
Amounts received 0 0
Total cash flows 11,915 23,130
Net closing balance, ending balance 49,954 48,031
Closing reinsurance contract held assets, ending balance 53,327 50,723
Reinsurance contracts held that are liabilities (3,373) (2,692)
Reinsurance contracts held | Liabilities for remaining coverage, loss component    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 631 246
Opening reinsurance contract held liabilities, beginning balance 5 2
Net opening balance, beginning balance 636 248
Changes in income and OCI    
Allocation of reinsurance premium paid 0 0
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses (41) (32)
Recoveries and reversals of recoveries of losses on onerous underlying contracts 187 372
Adjustments to assets for incurred claims 0 0
Insurance service result 146 340
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts 146 340
Net finance (income) expenses from reinsurance contracts 22 12
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates (31) 36
Contracts measured under PAA 0 0
Total changes in income and OCI 137 388
Cash flows    
Premiums paid(1) 0 0
Amounts received 0 0
Total cash flows 0 0
Net closing balance, ending balance 773 636
Closing reinsurance contract held assets, ending balance 765 631
Reinsurance contracts held that are liabilities 8 5
Reinsurance contracts held | Liabilities for incurred claims | Products not under PAA    
Changes in insurance contracts for reconciliation by remaining coverage and incurred claims [abstract]    
Opening reinsurance contract held assets, beginning balance 7,395 7,035
Opening reinsurance contract held liabilities, beginning balance 44 (136)
Net opening balance, beginning balance 7,439 6,899
Changes in income and OCI    
Allocation of reinsurance premium paid 0 0
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 6,397 6,002
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims 31 11
Insurance service result 6,428 6,013
Investment components and premium refunds 1,815 (1,939)
Net expenses from reinsurance contracts 8,243 7,952
Net finance (income) expenses from reinsurance contracts (183) 4
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates (312) 575
Contracts measured under PAA 0 0
Total changes in income and OCI 7,748 8,531
Cash flows    
Premiums paid(1) 0 0
Amounts received (8,538) (7,991)
Total cash flows (8,538) (7,991)
Net closing balance, ending balance 6,649 7,439
Closing reinsurance contract held assets, ending balance 6,522 7,395
Reinsurance contracts held that are liabilities 127 44
Reinsurance contracts held | Liabilities for incurred claims | 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 252 275
Opening reinsurance contract held liabilities, beginning balance (26) (63)
Net opening balance, beginning balance 226 212
Changes in income and OCI    
Allocation of reinsurance premium paid 0 0
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 623 607
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims (16) (14)
Insurance service result 607 593
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts 607 593
Net finance (income) expenses from reinsurance contracts 3 3
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 0 0
Contracts measured under PAA 0 0
Total changes in income and OCI 610 596
Cash flows    
Premiums paid(1) 0 0
Amounts received (618) (582)
Total cash flows (618) (582)
Net closing balance, ending balance 218 226
Closing reinsurance contract held assets, ending balance 253 252
Reinsurance contracts held that are liabilities (35) (26)
Reinsurance contracts held | Liabilities for incurred claims | 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 14 16
Opening reinsurance contract held liabilities, beginning balance 0 0
Net opening balance, beginning balance 14 16
Changes in income and OCI    
Allocation of reinsurance premium paid 0 0
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 0 1
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims (1) (7)
Insurance service result (1) (6)
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts (1) (6)
Net finance (income) expenses from reinsurance contracts 1 4
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 0 0
Contracts measured under PAA 0 0
Total changes in income and OCI 0 (2)
Cash flows    
Premiums paid(1) 0 0
Amounts received 0 0
Total cash flows 0 0
Net closing balance, ending balance 14 14
Closing reinsurance contract held assets, ending balance 14 14
Reinsurance contracts held that are liabilities $ 0 $ 0