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Insurance Contracts - Insurance Contracts Issued and Reinsurance Contracts Held (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Insurance    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin $ 13,028 $ 11,845
Insurance | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 5,952 6,062
Insurance | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,042 1,162
Insurance | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 6,034 4,621
Insurance | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Insurance | Due in 1 year or less    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,051 975
Insurance | Due in 1 year or less | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 450 476
Insurance | Due in 1 year or less | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 104 112
Insurance | Due in 1 year or less | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 497 387
Insurance | Due in 1 year or less | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Insurance | 1 Year to 3 Years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,868 1,719
Insurance | 1 Year to 3 Years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 805 848
Insurance | 1 Year to 3 Years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 180 194
Insurance | 1 Year to 3 Years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 883 677
Insurance | 1 Year to 3 Years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Insurance | 3 Years to 5 Years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,591 1,459
Insurance | 3 Years to 5 Years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 692 726
Insurance | 3 Years to 5 Years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 149 162
Insurance | 3 Years to 5 Years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 750 571
Insurance | 3 Years to 5 Years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Insurance | Due in years 6-10    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 2,973 2,747
Insurance | Due in years 6-10 | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,325 1,378
Insurance | Due in years 6-10 | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 266 294
Insurance | Due in years 6-10 | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,382 1,075
Insurance | Due in years 6-10 | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Insurance | Due after 10 years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 5,545 4,945
Insurance | Due after 10 years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 2,680 2,634
Insurance | Due after 10 years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 343 400
Insurance | Due after 10 years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 2,522 1,911
Insurance | Due after 10 years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 338 (59)
Reinsurance contracts held | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 560 (32)
Reinsurance contracts held | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (166) (9)
Reinsurance contracts held | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (56) (18)
Reinsurance contracts held | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held | Due in 1 year or less    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 32 (6)
Reinsurance contracts held | Due in 1 year or less | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 52 (2)
Reinsurance contracts held | Due in 1 year or less | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (15) (3)
Reinsurance contracts held | Due in 1 year or less | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (5) (1)
Reinsurance contracts held | Due in 1 year or less | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held | 1 Year to 3 Years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 57 (9)
Reinsurance contracts held | 1 Year to 3 Years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 92 (3)
Reinsurance contracts held | 1 Year to 3 Years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (26) (4)
Reinsurance contracts held | 1 Year to 3 Years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (9) (2)
Reinsurance contracts held | 1 Year to 3 Years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held | 3 Years to 5 Years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 47 (8)
Reinsurance contracts held | 3 Years to 5 Years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 77 (3)
Reinsurance contracts held | 3 Years to 5 Years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (22) (3)
Reinsurance contracts held | 3 Years to 5 Years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (8) (2)
Reinsurance contracts held | 3 Years to 5 Years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held | Due in years 6-10    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 82 (13)
Reinsurance contracts held | Due in years 6-10 | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 138 (7)
Reinsurance contracts held | Due in years 6-10 | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (42) (2)
Reinsurance contracts held | Due in years 6-10 | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (14) (4)
Reinsurance contracts held | Due in years 6-10 | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 0
Reinsurance contracts held | Due after 10 years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 120 (23)
Reinsurance contracts held | Due after 10 years | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 201 (17)
Reinsurance contracts held | Due after 10 years | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (61) 3
Reinsurance contracts held | Due after 10 years | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (20) (9)
Reinsurance contracts held | Due after 10 years | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin $ 0 $ 0