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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, 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)  
Amounts recoverable from reinsurers    
Net expenses from reinsurance contracts held (769) $ (613)
Effect of changes in non-performance risk of reinsurers 57 15
Cash flows    
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
Changes in income and OCI    
Allocation of reinsurance premium paid (7,709) (6,430)
Amounts recoverable from reinsurers    
Recoveries of incurred claims and other insurance service expenses 6,578 5,751
Recoveries and reversals of recoveries of losses on onerous underlying contracts 372 77
Adjustments to assets for incurred claims (10) (11)
Insurance service result (769) (613)
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts held (769) (613)
Net finance (income) expenses from reinsurance contracts (1,836) 639
Effect of changes in non-performance risk of reinsurers (58) (14)
Effects of movements in foreign exchange rates 4,632 (1,098)
Contracts measured under PAA 0 0
Total changes in income and OCI 1,969 (1,086)
Cash flows    
Premiums paid 23,130 4,956
Amounts received (8,573) (7,530)
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 contract held assets from reinsurance transactions 18,600 0
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 35,079 37,853
Opening reinsurance contract held liabilities, beginning balance (2,634) (2,196)
Net opening balance, beginning balance 32,445 35,657
Changes in income and OCI    
Allocation of reinsurance premium paid (7,709) (6,430)
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 (7,709) (6,430)
Investment components and premium refunds (1,939) 1,519
Net expenses from reinsurance contracts held (9,648) (7,949)
Net finance (income) expenses from reinsurance contracts (1,859) 719
Effect of changes in non-performance risk of reinsurers (58) (14)
Effects of movements in foreign exchange rates 4,021 (924)
Contracts measured under PAA 0 0
Total changes in income and OCI (7,544) (8,168)
Cash flows    
Premiums paid 23,130 4,956
Amounts received 0 0
Total cash flows 23,130 4,956
Net closing balance, ending balance 48,031 32,445
Closing reinsurance contract held assets, ending balance 50,723 35,079
Reinsurance contracts held that are liabilities (2,692) (2,634)
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 246 209
Opening reinsurance contract held liabilities, beginning balance 2 4
Net opening balance, beginning balance 248 213
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 (32) (45)
Recoveries and reversals of recoveries of losses on onerous underlying contracts 372 77
Adjustments to assets for incurred claims 0 0
Insurance service result 340 32
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts held 340 32
Net finance (income) expenses from reinsurance contracts 12 8
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 36 (5)
Contracts measured under PAA 0 0
Total changes in income and OCI 388 35
Cash flows    
Premiums paid 0 0
Amounts received 0 0
Total cash flows 0 0
Net closing balance, ending balance 636 248
Closing reinsurance contract held assets, ending balance 631 246
Reinsurance contracts held that are liabilities 5 2
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 7,035 7,521
Opening reinsurance contract held liabilities, beginning balance (136) (137)
Net opening balance, beginning balance 6,899 7,384
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 6,002 5,228
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims 11 5
Insurance service result 6,013 5,233
Investment components and premium refunds 1,939 (1,519)
Net expenses from reinsurance contracts held 7,952 6,752
Net finance (income) expenses from reinsurance contracts 4 (97)
Effect of changes in non-performance risk of reinsurers 0 0
Effects of movements in foreign exchange rates 575 (169)
Contracts measured under PAA 0 0
Total changes in income and OCI 8,531 6,486
Cash flows    
Premiums paid 0 0
Amounts received (7,991) (6,971)
Total cash flows (7,991) (6,971)
Net closing balance, ending balance 7,439 6,899
Closing reinsurance contract held assets, ending balance 7,395 7,035
Reinsurance contracts held that are liabilities 44 (136)
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 275 280
Opening reinsurance contract held liabilities, beginning balance (63) (62)
Net opening balance, beginning balance 212 218
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 607 568
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims (14) (24)
Insurance service result 593 544
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts held 593 544
Net finance (income) expenses from reinsurance contracts 3 9
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 596 553
Cash flows    
Premiums paid 0 0
Amounts received (582) (559)
Total cash flows (582) (559)
Net closing balance, ending balance 226 212
Closing reinsurance contract held assets, ending balance 252 275
Reinsurance contracts held that are liabilities (26) (63)
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 16 8
Opening reinsurance contract held liabilities, beginning balance 0 0
Net opening balance, beginning balance 16 8
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 1 0
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Adjustments to assets for incurred claims (7) 8
Insurance service result (6) 8
Investment components and premium refunds 0 0
Net expenses from reinsurance contracts held (6) 8
Net finance (income) expenses from reinsurance contracts 4 0
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 (2) 8
Cash flows    
Premiums paid 0 0
Amounts received 0 0
Total cash flows 0 0
Net closing balance, ending balance 14 16
Closing reinsurance contract held assets, ending balance 14 16
Reinsurance contracts held that are liabilities $ 0 $ 0