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Insurance and Reinsurance Contract Assets and Liabilities - Significant Judgements and Estimates (Detail)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 30 years 30 years
Ultimate year 70 years 70 years
Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 30 years 30 years
Ultimate year 70 years 70 years
U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 30 years 30 years
Ultimate year 70 years 70 years
U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 30 years 30 years
Ultimate year 70 years 70 years
Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 30 years 30 years
Ultimate year 70 years 70 years
Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Observable years 15 years 15 years
Ultimate year 55 years 55 years
Less than 1 year | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.46% 5.17%
Less than 1 year | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.44% 5.14%
Less than 1 year | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.48% 5.38%
Less than 1 year | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.56% 5.32%
Less than 1 year | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 0.82% 0.53%
Less than 1 year | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.73% 4.20%
5 years | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.93% 4.33%
5 years | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.89% 4.22%
5 years | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.05% 4.54%
5 years | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.09% 4.57%
5 years | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 1.17% 0.77%
5 years | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.36% 4.01%
10 years | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.86% 4.92%
10 years | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.76% 4.69%
10 years | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 6.01% 5.37%
10 years | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.91% 5.25%
10 years | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 1.55% 1.08%
10 years | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.23% 4.98%
20 years | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.00% 4.86%
20 years | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.98% 4.72%
20 years | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 6.33% 5.65%
20 years | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 6.33% 5.56%
20 years | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 2.33% 1.75%
20 years | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.70% 4.61%
30 years | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.32% 4.80%
30 years | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.21% 4.69%
30 years | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 6.15% 5.27%
30 years | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 6.14% 5.18%
30 years | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 2.97% 2.24%
30 years | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.17% 4.19%
Ultimate | Canada | CAD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.40% 4.40%
Ultimate | Canada | CAD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.40% 4.40%
Ultimate | U.S. | USD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.15% 5.00%
Ultimate | U.S. | USD | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.03% 4.88%
Ultimate | Japan | JPY | Somewhat liquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 1.60% 1.60%
Ultimate | Hong Kong | HKD | Illiquid    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.70% 3.80%