v3.26.1
(Re)Insurance contracts and investment contracts with discretionary participation features - Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Returns on Underlying Items (Detail)
Dec. 31, 2025
Dec. 31, 2024
GBP [member] | Not later than 1 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 3.54% 4.46%
GBP [member] | 5 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 3.67% 4.04%
GBP [member] | 10 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.04% 4.07%
GBP [member] | 15 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.36% 4.23%
GBP [member] | 20 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.54% 4.30%
GBP [member] | 30 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.59% 4.23%
USD [member] | Not later than 1 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 3.48% 4.24%
USD [member] | 5 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 3.77% 4.46%
USD [member] | 10 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.28% 4.67%
USD [member] | 15 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 4.84% 4.89%
USD [member] | 20 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 5.16% 5.05%
USD [member] | 30 year [member]    
Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]    
Yield curves 5.00% 4.82%