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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 (₫)
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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)

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