v3.25.4
Insurance and Reinsurance Contract Assets and Liabilities - Expected Recognition of Contractual Service Margin (Detail) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin $ 26,568 $ 23,424
Less than 1 year    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 2,536 2,027
1 to 5 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 8,091 6,614
5 to 10 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 6,396 4,306
10 to 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 6,083 4,397
More than 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 3,462 6,080
Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,461 4,110
Canada | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,468 4,739
Canada | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (7) (629)
Canada | Less than 1 year    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 425 373
Canada | Less than 1 year | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 414 426
Canada | Less than 1 year | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 11 (53)
Canada | 1 to 5 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,340 1,197
Canada | 1 to 5 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,301 1,347
Canada | 1 to 5 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 39 (150)
Canada | 5 to 10 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,084 990
Canada | 5 to 10 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,061 1,116
Canada | 5 to 10 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 23 (126)
Canada | 10 to 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,034 1,029
Canada | 10 to 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,031 1,173
Canada | 10 to 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 3 (144)
Canada | More than 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 578 521
Canada | More than 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 661 677
Canada | More than 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (83) (156)
U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 2,760 2,468
U.S. | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 5,288 4,561
U.S. | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (2,528) (2,093)
U.S. | Less than 1 year    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 233 196
U.S. | Less than 1 year | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 548 474
U.S. | Less than 1 year | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (315) (278)
U.S. | 1 to 5 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 775 675
U.S. | 1 to 5 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,736 1,510
U.S. | 1 to 5 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (961) (835)
U.S. | 5 to 10 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 662 625
U.S. | 5 to 10 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,370 1,194
U.S. | 5 to 10 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (708) (569)
U.S. | 10 to 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 647 642
U.S. | 10 to 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,180 1,023
U.S. | 10 to 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (533) (381)
U.S. | More than 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 443 330
U.S. | More than 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 454 360
U.S. | More than 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (11) (30)
Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 19,348 16,837
Asia | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 20,449 17,605
Asia | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (1,101) (768)
Asia | Less than 1 year    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,877 1,455
Asia | Less than 1 year | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1,978 1,527
Asia | Less than 1 year | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (101) (72)
Asia | 1 to 5 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 5,954 4,711
Asia | 1 to 5 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 6,370 5,006
Asia | 1 to 5 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (416) (295)
Asia | 5 to 10 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,639 2,667
Asia | 5 to 10 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,944 2,861
Asia | 5 to 10 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (305) (194)
Asia | 10 to 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,426 2,757
Asia | 10 to 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 4,592 2,815
Asia | 10 to 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (166) (58)
Asia | More than 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 2,452 5,247
Asia | More than 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 2,565 5,396
Asia | More than 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (113) (149)
Corporate and Other    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (1) 9
Corporate and Other | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (143) (140)
Corporate and Other | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 142 149
Corporate and Other | Less than 1 year    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 1 3
Corporate and Other | Less than 1 year | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (11) (10)
Corporate and Other | Less than 1 year | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 12 13
Corporate and Other | 1 to 5 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 22 31
Corporate and Other | 1 to 5 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (38) (36)
Corporate and Other | 1 to 5 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 60 67
Corporate and Other | 5 to 10 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 11 24
Corporate and Other | 5 to 10 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (37) (35)
Corporate and Other | 5 to 10 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 48 59
Corporate and Other | 10 to 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (24) (31)
Corporate and Other | 10 to 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (43) (42)
Corporate and Other | 10 to 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin 19 11
Corporate and Other | More than 20 years    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (11) (18)
Corporate and Other | More than 20 years | Insurance contracts issued    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin (14) (17)
Corporate and Other | More than 20 years | Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contractual service margin $ 3 $ (1)