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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
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