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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Effect of New Business Recognized in the Year (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) $ 77 $ 132
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 72 151
Estimates of present value of cash outflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (1,997) (7,894)
Estimates of present value of cash inflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 1,933 6,618
Risk adjustment for non-financial risk [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 399 717
Contractual service margin [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (263) 710
Non-Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 22,211 13,919
Non-Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 4,295 3,412
Non-Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 17,916 10,507
Non-Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) (25,541) (16,949)
Non-Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 962 1,032
Non-Onerous [Member] | Contractual service margin [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 2,368 1,998
Onerous [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 253 514
Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 3,796 5,580
Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 623 846
Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 3,173 4,734
Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) (3,761) (5,430)
Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 218 364
Asia [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 12 37
Asia [Member] | Estimates of present value of cash outflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (916) (519)
Asia [Member] | Estimates of present value of cash inflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 815 453
Asia [Member] | Risk adjustment for non-financial risk [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 170 125
Asia [Member] | Contractual service margin [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (57) (22)
Asia [Member] | Non-Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 16,209 8,470
Asia [Member] | Non-Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 3,011 2,244
Asia [Member] | Non-Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 13,198 6,226
Asia [Member] | Non-Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) (18,765) (10,759)
Asia [Member] | Non-Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 679 704
Asia [Member] | Non-Onerous [Member] | Contractual service margin [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 1,877 1,585
Asia [Member] | Onerous [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 158 334
Asia [Member] | Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 2,399 3,953
Asia [Member] | Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 322 499
Asia [Member] | Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 2,077 3,454
Asia [Member] | Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) (2,330) (3,772)
Asia [Member] | Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 89 153
Canada [member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 13 32
Canada [member] | Estimates of present value of cash outflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (331) (291)
Canada [member] | Estimates of present value of cash inflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 319 261
Canada [member] | Risk adjustment for non-financial risk [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 76 77
Canada [member] | Contractual service margin [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (51) (15)
Canada [member] | Non-Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 3,478 3,604
Canada [member] | Non-Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 608 600
Canada [member] | Non-Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 2,870 3,004
Canada [member] | Non-Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) (3,823) (3,901)
Canada [member] | Non-Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 115 107
Canada [member] | Non-Onerous [Member] | Contractual service margin [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 230 190
Canada [member] | Onerous [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 26 51
Canada [member] | Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 271 390
Canada [member] | Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 68 119
Canada [member] | Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 203 271
Canada [member] | Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) (286) (431)
Canada [member] | Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 41 92
U.S. [member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 47 82
U.S. [member] | Estimates of present value of cash outflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (750) (7,084)
U.S. [member] | Estimates of present value of cash inflows [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 799 5,904
U.S. [member] | Risk adjustment for non-financial risk [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) 153 515
U.S. [member] | Contractual service margin [Member] | Reinsurance contracts held [Member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period reinsurance contracts liability (asset) (155) 747
U.S. [member] | Non-Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 2,524 1,845
U.S. [member] | Non-Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 676 568
U.S. [member] | Non-Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 1,848 1,277
U.S. [member] | Non-Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) (2,953) (2,289)
U.S. [member] | Non-Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 168 221
U.S. [member] | Non-Onerous [Member] | Contractual service margin [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) 261 223
U.S. [member] | Onerous [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 69 129
U.S. [member] | Onerous [Member] | Estimates of present value of cash outflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 1,126 1,237
U.S. [member] | Onerous [Member] | Insurance acquisition cash flows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 233 228
U.S. [member] | Onerous [Member] | Claims and other insurance service expenses payable [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) 893 1,009
U.S. [member] | Onerous [Member] | Estimates of present value of cash inflows [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) (1,145) (1,227)
U.S. [member] | Onerous [Member] | Risk adjustment for non-financial risk [Member] | Insurance contracts issued [member]    
Disclosure of effect of insurance contracts initially recognised [line items]    
Increase (decrease) through effects of groups of onerous contracts initially recognised in period, insurance contracts liability (asset) $ 88 $ 119