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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Composition of Underlying Items (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Participating [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets $ 101,217 $ 90,691
Participating [Member] | Debt securities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 44,682 39,894
Participating [Member] | Public equities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 14,442 12,119
Participating [Member] | Mortgages [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 4,449 3,813
Participating [Member] | Private placements [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 6,720 5,666
Participating [Member] | Real estate [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 3,907 3,190
Participating [Member] | Other [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 27,017 26,009
Variable annuity [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 68,749 69,033
Variable annuity [Member] | Debt securities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity [Member] | Public equities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity [Member] | Mortgages [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity [Member] | Private placements [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity [Member] | Real estate [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity [Member] | Other [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 68,749 69,033
Unit linked [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 15,539 13,476
Unit linked [Member] | Debt securities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked [Member] | Public equities [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked [Member] | Mortgages [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked [Member] | Private placements [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked [Member] | Real estate [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked [Member] | Other [Member]    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets $ 15,539 $ 13,476