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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Significant Judgements and Estimates (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Canada [Member] | CAD [Member] | Illiquid [Member]    
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 [Member] | CAD [Member] | More liquid [Member]    
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. [member] | USD [Member] | Illiquid [Member]    
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. [member] | USD [Member] | More liquid [Member]    
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 [member | JPY [Member] | Mixed [Member]    
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 [member | HKD [Member] | Illiquid [Member]    
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
1 Year [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.17% 5.29%
1 Year [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.14% 5.21%
1 Year [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.38% 5.28%
1 Year [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.32% 5.23%
1 Year [Member] | Japan [member | JPY [Member] | Mixed [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 0.53% 0.72%
1 Year [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.20% 4.69%
5 Year [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.33% 4.81%
5 Year [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.22% 4.63%
5 Year [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.54% 4.87%
5 Year [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.57% 4.88%
5 Year [Member] | Japan [member | JPY [Member] | Mixed [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 0.77% 0.98%
5 Year [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.01% 4.95%
10 Year [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.92% 5.35%
10 Year [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.69% 4.97%
10 Year [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.37% 5.74%
10 Year [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.25% 5.61%
10 Year [Member] | Japan [member | JPY [Member] | Mixed [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 1.08% 0.91%
10 Year [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.98% 5.60%
20 Year [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.86% 5.35%
20 Year [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.72% 5.02%
20 Year [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.65% 5.86%
20 Year [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.56% 5.76%
20 Year [Member] | Japan [member | JPY [Member] | Mixed [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 1.75% 1.70%
20 Year [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.61% 4.99%
30 Year [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.80% 5.03%
30 Year [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.69% 4.91%
30 Year [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.27% 5.34%
30 Year [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.18% 5.23%
30 Year [Member] | Japan [member | JPY [Member] | Mixed [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 2.24% 2.22%
30 Year [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.19% 4.36%
Ultimate [Member] | Canada [Member] | CAD [Member] | Illiquid [Member]    
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 [Member] | Canada [Member] | CAD [Member] | More liquid [Member]    
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 [Member] | U.S. [member] | USD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 5.00% 5.00%
Ultimate [Member] | U.S. [member] | USD [Member] | More liquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 4.88% 4.88%
Ultimate [Member] | Japan [member | JPY [Member] | Mixed [Member]    
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 [Member] | Hong Kong [member | HKD [Member] | Illiquid [Member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Years 3.80% 3.80%