v3.25.4
Insurance and Reinsurance Contract Assets and Liabilities - Effect of New Business Recognized in the Year (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts $ (187) $ (372)
Amount included in reinsurance assets for the year 48 57
Estimates of present value of cash outflows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year (9,402) (20,816)
Estimates of PV of future cash flows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 8,322 18,990
Risk adjustment for non-financial risk | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 825 1,261
Contractual service margin | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 303 622
Non-Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 0 0
Non-Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 44,670 35,333
Non-Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 8,049 6,426
Non-Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 36,621 28,907
Non-Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year (50,005) (39,381)
Non-Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 1,034 853
Non-Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 4,301 3,195
Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 81 104
Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 1,209 2,170
Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 258 398
Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 951 1,772
Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts (1,196) (2,165)
Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 68 99
Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Asia | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 20 16
Asia | Estimates of present value of cash outflows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year (2,316) (7,144)
Asia | Estimates of PV of future cash flows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 2,032 6,950
Asia | Risk adjustment for non-financial risk | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 140 189
Asia | Contractual service margin | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 164 21
Asia | Non-Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 0 0
Asia | Non-Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 32,414 26,508
Asia | Non-Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 5,951 4,764
Asia | Non-Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 26,463 21,744
Asia | Non-Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year (36,561) (29,664)
Asia | Non-Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 741 600
Asia | Non-Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 3,406 2,556
Asia | Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 40 44
Asia | Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 554 1,019
Asia | Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 117 147
Asia | Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 437 872
Asia | Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts (540) (1,002)
Asia | Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 26 27
Asia | Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
Canada | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 7 8
Canada | Estimates of present value of cash outflows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year (713) (6,153)
Canada | Estimates of PV of future cash flows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 626 5,876
Canada | Risk adjustment for non-financial risk | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 79 68
Canada | Contractual service margin | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 15 217
Canada | Non-Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 0 0
Canada | Non-Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 7,075 5,386
Canada | Non-Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 1,080 860
Canada | Non-Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 5,995 4,526
Canada | Non-Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year (7,675) (5,876)
Canada | Non-Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 147 117
Canada | Non-Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 453 373
Canada | Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 12 16
Canada | Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 86 193
Canada | Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 20 40
Canada | Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 66 153
Canada | Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts (88) (203)
Canada | Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 14 26
Canada | Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 0 0
U.S. | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 21 33
U.S. | Estimates of present value of cash outflows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year (6,373) (7,519)
U.S. | Estimates of PV of future cash flows | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 5,664 6,164
U.S. | Risk adjustment for non-financial risk | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 606 1,004
U.S. | Contractual service margin | Reinsurance contracts held    
Disclosure of effect of insurance contracts initially recognised [line items]    
Amount included in reinsurance assets for the year 124 384
U.S. | Non-Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 0 0
U.S. | Non-Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 5,181 3,439
U.S. | Non-Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 1,018 802
U.S. | Non-Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 4,163 2,637
U.S. | Non-Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year (5,769) (3,841)
U.S. | Non-Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 146 136
U.S. | Non-Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Contracts initially recognized during the year 442 266
U.S. | Onerous | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 29 44
U.S. | Onerous | Estimates of present value of cash outflows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 569 958
U.S. | Onerous | Insurance acquisition cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 121 211
U.S. | Onerous | Claims and other insurance service expenses payable | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 448 747
U.S. | Onerous | Estimates of PV of future cash flows | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts (568) (960)
U.S. | Onerous | Risk adjustment for non-financial risk | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts 28 46
U.S. | Onerous | Contractual service margin | Insurance contracts issued    
Disclosure of effect of insurance contracts initially recognised [line items]    
Recoveries and reversals of recoveries of losses on onerous underlying contracts $ 0 $ 0