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Insurance Contracts - Insurance Contracts Issued and Reinsurance Contracts Held (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Insurance    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin $ 11,845 $ 10,970
Insurance | Reportable segments | Canada    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 6,062 5,481
Insurance | Reportable segments | U.S.    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 1,162 1,296
Insurance | Reportable segments | Asia    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 4,621 3,811
Insurance | Reportable segments | Corporate    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 0 382
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 975 844
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 476 396
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 112 116
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 387 290
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 42
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 1,719 1,506
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 848 715
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 194 207
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 677 512
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 72
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 1,459 1,292
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 726 623
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 162 176
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 571 435
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 58
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 2,747 2,470
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 1,378 1,217
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 294 328
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 1,075 827
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 98
Insurance | Due after 10 years    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin 4,945 4,858
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 2,634 2,530
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 400 469
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 1,911 1,747
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 0 112
Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Contractual service margin (59) (105)
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 (32) 20
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 (9) (128)
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 (18) 7
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 (4)
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 (6) (8)
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 (2) 1
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 (3) (11)
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 (1) 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 1
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 (9) (15)
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 (3) 2
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 (4) (19)
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 (2) 1
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 1
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 (8) (14)
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 (3) 2
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 (3) (17)
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 (2) 1
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 (13) (27)
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 (7) 4
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 (2) (32)
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 (4) 2
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 (1)
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 (23) (41)
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 (17) 11
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 3 (49)
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 (9) 2
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 $ (5)