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Insurance and Reinsurance Contract Assets and Liabilities - Asset for Acquisition Cash Flow (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year $ 878 $ 820
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 137 131
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 381 355
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 360 334
Asia    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 290 271
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 65 59
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 168 150
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 57 62
Canada    
Disclosure of information about expected derecognition of assets for insurance acquisition cash flows [line items]    
Acquisition cash flows incurred in the year 588 549
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 72 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 213 205
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 $ 303 $ 272