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Insurance and Reinsurance Contract Assets and Liabilities - Composition of Underlying Items (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Participating    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets $ 123,494 $ 101,217
Participating | Debt securities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 54,238 44,682
Participating | Public equities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 19,846 14,442
Participating | Mortgages    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 4,535 4,449
Participating | Private placements    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 8,398 6,720
Participating | Real estate    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 4,525 3,907
Participating | Other    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 31,952 27,017
Variable annuity    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 72,061 68,749
Variable annuity | Debt securities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity | Public equities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity | Mortgages    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity | Private placements    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity | Real estate    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Variable annuity | Other    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 72,061 68,749
Unit linked    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 18,771 15,539
Unit linked | Debt securities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked | Public equities    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked | Mortgages    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked | Private placements    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked | Real estate    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets 0 0
Unit linked | Other    
Disclosure Of Composition Of Underlying Items For Contracts With Direct Participation Features [Line Items]    
Underlying assets $ 18,771 $ 15,539