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Insurance and Reinsurance Contract Assets and Liabilities - Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts Held by Measurement Components (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities $ 522,844 $ 481,994 $ 464,392
Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 180,536 154,317  
Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 120,526 116,221  
Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 223,563 213,061  
Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (903) (785)  
Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 56,346 39,820  
Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 6,810 1,631  
Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 6,759 1,009  
Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 43,030 37,423  
Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (253) (243)  
Assets for insurance acquisition cash flows | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (878) (820)  
Assets for insurance acquisition cash flows | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (290) (271)  
Assets for insurance acquisition cash flows | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (588) (549)  
Assets for insurance acquisition cash flows | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Assets for insurance acquisition cash flows | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
CSM, Fair value | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 19,007 17,413  
CSM, Fair value | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 11,338 10,431  
CSM, Fair value | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 3,986 3,851  
CSM, Fair value | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 3,823 3,243  
CSM, Fair value | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (140) (112)  
CSM, Fair value | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 2,507 681  
CSM, Fair value | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 627 623  
CSM, Fair value | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 426 338  
CSM, Fair value | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1,603 (143)  
CSM, Fair value | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (149) (137)  
CSM, Other | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 7,758 4,691  
CSM, Other | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 6,267 3,740  
CSM, Other | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 753 492  
CSM, Other | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 738 459  
CSM, Other | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
CSM, Other | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 834 122  
CSM, Other | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 141 70  
CSM, Other | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 203 (56)  
CSM, Other | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 490 108  
CSM, Other | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Total Excluding Assets For Insurance Acquisition Cash Flows [Member] | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 522,843 481,994  
Total Excluding Assets For Insurance Acquisition Cash Flows [Member] | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 180,246 154,046  
Total Excluding Assets For Insurance Acquisition Cash Flows [Member] | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 119,937 115,672  
Total Excluding Assets For Insurance Acquisition Cash Flows [Member] | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 223,563 213,061  
Total Excluding Assets For Insurance Acquisition Cash Flows [Member] | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (903) (785)  
PAA | Assets for insurance acquisition cash flows | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 460,761 424,534  
PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 153,801 132,135  
PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 100,296 96,455  
PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 207,665 196,921  
PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (1,001) (977)  
PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 46,967 33,772  
PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 4,462 (351)  
PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 4,308 (1,238)  
PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 38,295 35,461  
PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (98) (100)  
PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 22,303 22,838  
PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 7,630 6,764  
PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 3,350 3,649  
PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 11,337 12,438  
PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (14) (13)  
PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 5,775 4,990  
PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1,580 1,326  
PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1,561 1,674  
PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 2,641 1,997  
PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities (7) (7)  
Products not under PAA | Assets for insurance acquisition cash flows | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 13,201 12,712  
Products not under PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1,497 1,242  
Products not under PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 11,452 11,153  
Products not under PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Products not under PAA | Assets for insurance acquisition cash flows | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 252 317  
Products not under PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 249 239  
Products not under PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 (37)  
Products not under PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 248 275  
Products not under PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Products not under PAA | Assets for insurance acquisition cash flows | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1 1  
Products not under PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 691 626  
Products not under PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 3 5  
Products not under PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 688 621  
Products not under PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Products not under PAA | PAA Risk adjustment for non-financial risk | Insurance contracts issued | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Products not under PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 14 16  
Products not under PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Asia      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 0 0  
Products not under PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Canada      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 13 16  
Products not under PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | U.S.      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities 1 0  
Products not under PAA | PAA Risk adjustment for non-financial risk | Reinsurance contracts held | Corporate and Other      
Disclosure of Detailed Information About Carrying Balances of Net Assets or Liabilities for Insurance Contracts Issued and Reinsurance Contracts held by Measurement Components [Line Items]      
Net insurance contract liabilities $ 0 $ 0