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Insurance Contract Liabilities and Reinsurance Assets - Summary of Carrying Value of Assets Backing Net Insurance Contract Liabilities, Other Liabilities and Capital (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | $ 848,941 | $ 917,643
Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 54,638 | 52,014
Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 47,057 | 42,842
Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 13,272 | 13,233
Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 203,904 | 224,139
Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 23,519 | 28,067
Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 506,551 | 557,348
Individual insurance participating [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 86,798 | 86,695
Individual insurance participating [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 4,378 | 3,799
Individual insurance participating [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 6,810 | 6,005
Individual insurance participating [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 3,346 | 3,467
Individual insurance participating [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 42,279 | 43,278
Individual insurance participating [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 12,253 | 14,667
Individual insurance participating [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 17,732 | 15,479
Individual insurance non-participating [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 140,158 | 151,108
Individual insurance non-participating [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 14,101 | 13,295
Individual insurance non-participating [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 19,498 | 17,741
Individual insurance non-participating [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 7,030 | 6,814
Individual insurance non-participating [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 72,706 | 82,050
Individual insurance non-participating [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 6,792 | 8,112
Individual insurance non-participating [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 20,031 | 23,096
Annuities and pensions [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 31,111 | 37,452
Annuities and pensions [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 4,350 | 4,572
Annuities and pensions [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 8,038 | 7,370
Annuities and pensions [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 913 | 987
Annuities and pensions [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 15,686 | 19,575
Annuities and pensions [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 336 | 453
Annuities and pensions [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 1,788 | 4,495
Other insurance contract liabilities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 65,664 | 72,489
Other insurance contract liabilities [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 8,766 | 8,526
Other insurance contract liabilities [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 10,497 | 9,775
Other insurance contract liabilities [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 1,875 | 1,782
Other insurance contract liabilities [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 31,998 | 36,207
Other insurance contract liabilities [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 562 | 374
Other insurance contract liabilities [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 11,966 | 15,825
Other Liabilities [member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 462,717 | 503,894
Other Liabilities [member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 22,997 | 21,802
Other Liabilities [member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 2,003 | 1,723
Other Liabilities [member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | (66) | 6
Other Liabilities [member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 9,739 | 10,723
Other Liabilities [member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 675 | 626
Other Liabilities [member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 427,369 | 469,014
Capital [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 62,493 | 66,005
Capital [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 46 | 20
Capital [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 211 | 228
Capital [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 174 | 177
Capital [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 31,496 | 32,306
Capital [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 2,901 | 3,835
Capital [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | $ 27,665 | $ 29,439

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