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Insurance and Reinsurance contract Assets and Liabilities - Summary of Insurance Contracts 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 insurance contract assets $ 673  
Opening insurance contract liabilities 354,849  
Insurance revenue [abstract]    
Insurance revenue 23,972 $ 23,118
Insurance service expense [abstract]    
Insurance finance (income) expenses (14,628) (6,307)
Cash flows    
Acquisition cash flows incurred in the year 820 805
Closing insurance contract assets 145 673
Closing insurance contract liabilities 367,996 354,849
Insurance Contracts Issued [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening insurance contract assets (673) (972)
Opening insurance contract liabilities 354,849 405,621
Opening insurance contract liabilities for account of segregated fund holders 110,216 130,836
Net opening balance 464,392 535,485
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result (13,165) (13,019)
Change in risk adjustment for non-financial risk expired (1,497) (1,665)
CSM recognized for services provided (2,162) (2,298)
Recovery of insurance acquisition cash flows (853) (534)
Contracts under PAA (6,295) (5,602)
Insurance revenue (23,972) (23,118)
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 19,516 19,256
Losses and reversal of losses on onerous contracts (future service) 90 742
Changes to liabilities for incurred claims (past service) (1,878) (1,948)
Amortization of insurance acquisition cash flows 1,654 1,285
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 19,382 19,335
Investment components and premium refunds 0 0
Insurance service result (4,590) (3,783)
Insurance finance (income) expenses 25,174 (68,833)
Effects of movements in foreign exchange rates (9,771) 16,061
Total changes in income and OCI 10,813 (56,555)
Cash flows    
Premiums and premium tax received 48,381 47,526
Claims and other insurance service expenses paid, including investment components (38,425) (34,986)
Insurance acquisition cash flows (6,920) (6,266)
Total cash flows 3,036 6,274
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year (174) (192)
Movements related to insurance contract liabilities for account of segregated fund holders 3,927 (20,620)
Net closing balance 481,994 464,392
Closing insurance contract assets (145) (673)
Closing insurance contract liabilities 367,996 354,849
Closing insurance contract liabilities for account of segregated fund holders 114,143 110,216
Net closing balance 481,994 464,392
Insurance finance (income) expenses, per disclosure in note 7 (f) 24,992 (68,833)
Insurance Contracts Issued [Member] | Assets for insurance acquisition cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening insurance contract assets (9)  
Opening insurance contract liabilities (796)  
Net opening balance (805)  
Cash flows    
Closing insurance contract assets   (9)
Closing insurance contract liabilities (820) (796)
Net closing balance (820) (805)
Insurance Contracts Issued [Member] | Cash flow hedges [Member]    
Cash flows    
Reclassification of derivative 3 0
Insurance Contracts Issued [Member] | Fair value hedges [Member]    
Cash flows    
Reclassification of derivative (185) 0
Insurance Contracts Issued [Member] | Excluding loss component [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening insurance contract assets (659) (842)
Opening insurance contract liabilities 336,981 388,585
Opening insurance contract liabilities for account of segregated fund holders 110,216 130,836
Net opening balance 446,538 518,579
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result (13,165) (13,019)
Change in risk adjustment for non-financial risk expired (1,497) (1,665)
CSM recognized for services provided (2,162) (2,298)
Recovery of insurance acquisition cash flows (853) (534)
Contracts under PAA (6,295) (5,602)
Insurance revenue (23,972) (23,118)
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 0 0
Losses and reversal of losses on onerous contracts (future service) 0 0
Changes to liabilities for incurred claims (past service) 0 0
Amortization of insurance acquisition cash flows 1,654 1,285
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 1,654 1,285
Investment components and premium refunds (19,080) (18,222)
Insurance service result (41,398) (40,055)
Insurance finance (income) expenses 24,268 (68,366)
Effects of movements in foreign exchange rates (9,657) 15,886
Total changes in income and OCI (26,787) (92,535)
Cash flows    
Premiums and premium tax received 48,381 47,526
Claims and other insurance service expenses paid, including investment components 0 0
Insurance acquisition cash flows (6,920) (6,266)
Total cash flows 41,461 41,260
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts (152) (146)
Acquisition cash flows incurred in the year 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 3,927 (20,620)
Net closing balance 464,987 446,538
Closing insurance contract assets (201) (659)
Closing insurance contract liabilities 351,045 336,981
Closing insurance contract liabilities for account of segregated fund holders 114,143 110,216
Net closing balance 464,987 446,538
Insurance Contracts Issued [Member] | Loss component [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening insurance contract assets 0 0
Opening insurance contract liabilities 1,328 303
Opening insurance contract liabilities for account of segregated fund holders 0 0
Net opening balance 1,328 303
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result 0 0
Change in risk adjustment for non-financial risk expired 0 0
CSM recognized for services provided 0 0
Recovery of insurance acquisition cash flows 0 0
Contracts under PAA 0 0
Insurance revenue 0 0
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses (320) 233
Losses and reversal of losses on onerous contracts (future service) 90 742
Changes to liabilities for incurred claims (past service) 0 0
Amortization of insurance acquisition cash flows 0 0
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) (230) 975
Investment components and premium refunds 0 0
Insurance service result (230) 975
Insurance finance (income) expenses 32 9
Effects of movements in foreign exchange rates (38) 41
Total changes in income and OCI (236) 1,025
Cash flows    
Premiums and premium tax received 0 0
Claims and other insurance service expenses paid, including investment components 0 0
Insurance acquisition cash flows 0 0
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 1,092 1,328
Closing insurance contract assets 0 0
Closing insurance contract liabilities 1,092 1,328
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 1,092 1,328
Insurance Contracts Issued [Member] | Liabilities 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 insurance contract assets 7 60
Opening insurance contract liabilities 5,857 4,342
Opening insurance contract liabilities for account of segregated fund holders 0 0
Net opening balance 5,864 4,402
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result 0 0
Change in risk adjustment for non-financial risk expired 0 0
CSM recognized for services provided 0 0
Recovery of insurance acquisition cash flows 0 0
Contracts under PAA 0 0
Insurance revenue 0 0
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 13,446 12,775
Losses and reversal of losses on onerous contracts (future service) 0 0
Changes to liabilities for incurred claims (past service) (31) (41)
Amortization of insurance acquisition cash flows 0 0
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 13,415 12,734
Investment components and premium refunds 17,148 16,514
Insurance service result 30,563 29,248
Insurance finance (income) expenses 15 753
Effects of movements in foreign exchange rates (71) 136
Total changes in income and OCI 30,507 30,137
Cash flows    
Premiums and premium tax received 0 0
Claims and other insurance service expenses paid, including investment components (30,706) (28,675)
Insurance acquisition cash flows 0 0
Total cash flows (30,706) (28,675)
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 5,665 5,864
Closing insurance contract assets 56 7
Closing insurance contract liabilities 5,609 5,857
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 5,665 5,864
Insurance Contracts Issued [Member] | Liabilities 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 insurance contract assets (12) 27
Opening insurance contract liabilities 10,877 12,230
Opening insurance contract liabilities for account of segregated fund holders 0 0
Net opening balance 10,865 12,257
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result 0 0
Change in risk adjustment for non-financial risk expired 0 0
CSM recognized for services provided 0 0
Recovery of insurance acquisition cash flows 0 0
Contracts under PAA 0 0
Insurance revenue 0 0
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 6,136 5,982
Losses and reversal of losses on onerous contracts (future service) 0 0
Changes to liabilities for incurred claims (past service) (1,605) (1,554)
Amortization of insurance acquisition cash flows 0 0
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 4,531 4,428
Investment components and premium refunds 1,932 1,708
Insurance service result 6,463 6,136
Insurance finance (income) expenses 848 (1,229)
Effects of movements in foreign exchange rates (12) 12
Total changes in income and OCI 7,299 4,919
Cash flows    
Premiums and premium tax received 0 0
Claims and other insurance service expenses paid, including investment components (7,719) (6,311)
Insurance acquisition cash flows 0 0
Total cash flows (7,719) (6,311)
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 10,445 10,865
Closing insurance contract assets 0 (12)
Closing insurance contract liabilities 10,445 10,877
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 10,445 10,865
Insurance Contracts Issued [Member] | Liabilities 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 insurance contract assets 0 0
Opening insurance contract liabilities 602 689
Opening insurance contract liabilities for account of segregated fund holders 0 0
Net opening balance 602 689
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result 0 0
Change in risk adjustment for non-financial risk expired 0 0
CSM recognized for services provided 0 0
Recovery of insurance acquisition cash flows 0 0
Contracts under PAA 0 0
Insurance revenue 0 0
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 254 266
Losses and reversal of losses on onerous contracts (future service) 0 0
Changes to liabilities for incurred claims (past service) (242) (353)
Amortization of insurance acquisition cash flows 0 0
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 12 (87)
Investment components and premium refunds 0 0
Insurance service result 12 (87)
Insurance finance (income) expenses 11 0
Effects of movements in foreign exchange rates 0 0
Total changes in income and OCI 23 (87)
Cash flows    
Premiums and premium tax received 0 0
Claims and other insurance service expenses paid, including investment components 0 0
Insurance acquisition cash flows 0 0
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 0 0
Acquisition cash flows incurred in the year 0 0
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 625 602
Closing insurance contract assets 0 0
Closing insurance contract liabilities 625 602
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance 625 602
Insurance Contracts Issued [Member] | Liabilities for incurred claims [Member] | PAA [Member] | Assets for insurance acquisition cash flows [Member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Opening insurance contract assets (9) (217)
Opening insurance contract liabilities (796) (528)
Opening insurance contract liabilities for account of segregated fund holders 0 0
Net opening balance (805) (745)
Insurance revenue [abstract]    
Expected incurred claims and other insurance service result 0 0
Change in risk adjustment for non-financial risk expired 0 0
CSM recognized for services provided 0 0
Recovery of insurance acquisition cash flows 0 0
Contracts under PAA 0 0
Insurance revenue 0 0
Insurance service expense [abstract]    
Incurred claims and other insurance service expenses 0 0
Losses and reversal of losses on onerous contracts (future service) 0 0
Changes to liabilities for incurred claims (past service) 0 0
Amortization of insurance acquisition cash flows 0 0
Net impairment of assets for insurance acquisition cash flows 0 0
Increase (decrease) through insurance service expenses, insurance contracts liability (asset) 0 0
Investment components and premium refunds 0 0
Insurance service result 0 0
Insurance finance (income) expenses 0 0
Effects of movements in foreign exchange rates 7 (14)
Total changes in income and OCI 7 (14)
Cash flows    
Premiums and premium tax received 0 0
Claims and other insurance service expenses paid, including investment components 0 0
Insurance acquisition cash flows 0 0
Total cash flows 0 0
Allocation from assets for insurance acquisition cash flows to groups of insurance contracts 152 146
Acquisition cash flows incurred in the year (174) (192)
Movements related to insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance (820) (805)
Closing insurance contract assets 0 (9)
Closing insurance contract liabilities (820) (796)
Closing insurance contract liabilities for account of segregated fund holders 0 0
Net closing balance $ (820) $ (805)