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Insurance Risk - Summary of concentration of insurance risks (Details)
€ in Thousands, $ in Thousands, ₫ in Millions, ₩ in Millions
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
VND (₫)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
VND (₫)
Insurance risk [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks ₩ 40,411,088       ₩ 41,539,373      
Insurance risk [member] | Domestic [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 40,411,937       41,540,714      
Insurance risk [member] | International [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks (849)       (1,341)      
Insurance risk [member] | Insurance contracts [member] | Insurance Contract Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 4,959,061       5,200,167      
Insurance risk [member] | Insurance contracts [member] | Insurance Contract Non-Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 29,807,816       31,159,084      
Insurance risk [member] | Insurance contracts [member] | Insurance Contract Variable [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 5,591,163       4,834,945      
Insurance risk [member] | Insurance contracts [member] | Domestic [member] | Insurance Contract Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 4,959,061       5,200,167      
Insurance risk [member] | Insurance contracts [member] | Domestic [member] | Insurance Contract Non-Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 29,808,665       31,160,425      
Insurance risk [member] | Insurance contracts [member] | Domestic [member] | Insurance Contract Variable [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 5,591,163       4,834,945      
Insurance risk [member] | Insurance contracts [member] | International [member] | Insurance Contract Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 0       0      
Insurance risk [member] | Insurance contracts [member] | International [member] | Insurance Contract Non-Participating [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks (849)       (1,341)      
Insurance risk [member] | Insurance contracts [member] | International [member] | Insurance Contract Variable [Member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 0       0      
Insurance risk [member] | Reinsurance Contract [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 53,048       345,177      
Insurance risk [member] | Reinsurance Contract [member] | Domestic [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 53,048       345,177      
Insurance risk [member] | Reinsurance Contract [member] | International [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Concentration of insurance risks 0       0      
Currency risk [member]                
Disclosure of detailed information about concentrations of risk that arises from contracts within scope of IFRS 17 [line items]                
Foreign currency amount   $ 279,946 € 110 ₫ (15,540)   $ 168,209 € 119 ₫ (23,242)
KRW converted amount ₩ 401,031 $ 401,695 € 185 ₫ (849) ₩ 246,108 $ 247,267 € 182 ₫ (1,341)