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Interests in Structured Entities - Schedule Investment and Maximum Exposure to Loss Related to Significant Unconsolidated Structured Entities (Detail) - Unconsolidated structured entities [Member] - Investment SEs [Member] - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of unconsolidated structured entities [Line Items]    
Company's investment $ 7,745 $ 7,277
Company's maximum exposure to loss 8,312 7,825
Leveraged leases [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Company's investment 3,790 3,840
Company's maximum exposure to loss 3,790 3,840
Infrastructure companies [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Company's investment 2,468 2,156
Company's maximum exposure to loss 3,035 2,704
Timberland companies [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Company's investment 811 816
Company's maximum exposure to loss 811 816
Real estate companies [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Company's investment 676 465
Company's maximum exposure to loss $ 676 $ 465