v3.25.4
Insurance and Reinsurance Contract Assets and Liabilities - Asset for Acquisition Cash Flow (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year $ 698 $ 878
Less than 1 year    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 91 137
1 to 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 259 381
Over 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 348 360
Asia    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 71 290
Asia | Less than 1 year    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 18 65
Asia | 1 to 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 36 168
Asia | Over 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 17 57
Canada    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 627 588
Canada | Less than 1 year    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 73 72
Canada | 1 to 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 223 213
Canada | Over 5 years    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year $ 331 $ 303