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Insurance and Reinsurance contract Assets and Liabilities - Summary of Reinsurance Contracts Held in Analysis by Remaining Coverage and Incurred Claims (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  
Net expenses from reinsurance contracts (613) $ (623)
Cash flows    
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
Allocation of reinsurance premium paid (6,430) (6,024)
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses 5,751 5,308
Recoveries and reversals of recoveries of losses on onerous underlying contracts 77 132
Adjustments to assets for incurred claims (11) (39)
Insurance service result (613) (623)
Investment components and premium refunds 0  
Net expenses from reinsurance contracts (613) (623)
Net finance (income) expenses from reinsurance contracts 639 (9,136)
Effect of changes in non-performance risk of reinsurers (14) 97
Effects of movements in foreign exchange rates (1,098) 3,146
Contracts measured under PAA 0  
Total changes in income and OCI (1,086) (6,516)
Cash flows    
Premiums paid 4,956 6,159
Amounts received (7,530) (6,913)
Total cash flows (2,574) (754)
Net closing 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] | Assets for remaining coverage excluding loss recovery component [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 37,853 45,699
Opening reinsurance contract held liabilities (2,196) (2,030)
Net opening balance 35,657 43,669
Allocation of reinsurance premium paid (6,430) (6,024)
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses 0  
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0  
Adjustments to assets for incurred claims 0  
Insurance service result (6,430) (6,024)
Investment components and premium refunds (1,519) (1,341)
Net expenses from reinsurance contracts (7,949) (7,365)
Net finance (income) expenses from reinsurance contracts 719 (9,586)
Effect of changes in non-performance risk of reinsurers (14) 97
Effects of movements in foreign exchange rates (924) 2,683
Contracts measured under PAA 0  
Total changes in income and OCI (8,168) (14,171)
Cash flows    
Premiums paid 4,956 6,159
Amounts received 0  
Total cash flows 4,956 6,159
Net closing balance 32,445 35,657
Closing reinsurance contract held assets 35,079 37,853
Closing reinsurance contract held liabilities (2,634) (2,196)
Net closing balance 32,445 35,657
Reinsurance contracts held [Member] | Assets for remaining coverage loss recovery component [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 209 79
Opening reinsurance contract held liabilities 4 19
Net opening balance 213 98
Allocation of reinsurance premium paid 0  
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses (45) (30)
Recoveries and reversals of recoveries of losses on onerous underlying contracts 77 132
Adjustments to assets for incurred claims 0  
Insurance service result 32 102
Investment components and premium refunds 0  
Net expenses from reinsurance contracts 32 102
Net finance (income) expenses from reinsurance contracts 8 5
Effect of changes in non-performance risk of reinsurers 0  
Effects of movements in foreign exchange rates (5) 8
Contracts measured under PAA 0  
Total changes in income and OCI 35 115
Cash flows    
Premiums paid 0  
Amounts received 0  
Total cash flows 0  
Net closing balance 248 213
Closing reinsurance contract held assets 246 209
Closing reinsurance contract held liabilities 2 4
Net closing balance 248 213
Reinsurance contracts held [Member] | Assets for incurred claims [Member] | Products not under PAA [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening reinsurance contract held assets 7,521 6,740
Opening reinsurance contract held liabilities (137) (27)
Net opening balance 7,384 6,713
Allocation of reinsurance premium paid 0  
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses 5,228 4,925
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0  
Adjustments to assets for incurred claims 5 3
Insurance service result 5,233 4,928
Investment components and premium refunds 1,519 1,341
Net expenses from reinsurance contracts 6,752 6,269
Net finance (income) expenses from reinsurance contracts (97) 446
Effect of changes in non-performance risk of reinsurers 0  
Effects of movements in foreign exchange rates (169) 455
Contracts measured under PAA 0  
Total changes in income and OCI 6,486 7,170
Cash flows    
Premiums paid 0  
Amounts received (6,971) (6,499)
Total cash flows (6,971) (6,499)
Net closing balance 6,899 7,384
Closing reinsurance contract held assets 7,035 7,521
Closing reinsurance contract held liabilities (136) (137)
Net closing balance 6,899 7,384
Reinsurance contracts held [Member] | Assets for incurred claims [Member] | PAA [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 280 303
Opening reinsurance contract held liabilities (62) (41)
Net opening balance 218 262
Allocation of reinsurance premium paid 0  
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses 568 417
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0  
Adjustments to assets for incurred claims (24) (33)
Insurance service result 544 384
Investment components and premium refunds 0  
Net expenses from reinsurance contracts 544 384
Net finance (income) expenses from reinsurance contracts 9 (14)
Effect of changes in non-performance risk of reinsurers 0  
Effects of movements in foreign exchange rates 0  
Contracts measured under PAA 0  
Total changes in income and OCI 553 370
Cash flows    
Premiums paid 0  
Amounts received (559) (414)
Total cash flows (559) (414)
Net closing balance 212 218
Closing reinsurance contract held assets 275 280
Closing reinsurance contract held liabilities (63) (62)
Net closing balance 212 218
Reinsurance contracts held [Member] | Assets for incurred claims [Member] | PAA [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 8 8
Opening reinsurance contract held liabilities 0  
Net opening balance 8 8
Allocation of reinsurance premium paid 0  
Amounts recoverable from reinsurers  
Recoveries of incurred claims and other insurance service expenses 0 (4)
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0  
Adjustments to assets for incurred claims 8 (9)
Insurance service result 8 (13)
Investment components and premium refunds 0  
Net expenses from reinsurance contracts 8 (13)
Net finance (income) expenses from reinsurance contracts 0 13
Effect of changes in non-performance risk of reinsurers 0  
Effects of movements in foreign exchange rates 0  
Contracts measured under PAA 0  
Total changes in income and OCI 8  
Cash flows    
Premiums paid 0  
Amounts received 0  
Total cash flows 0  
Net closing balance 16 8
Closing reinsurance contract held assets 16 8
Closing reinsurance contract held liabilities 0 0
Net closing balance $ 16 $ 8