Risk Management - Capital adequacy ratio (Details) - KRW (₩) ₩ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Disclosure of objectives policies and processes for managing capital [Abstract] | |||||
| Qualitative information about entitys objectives policies and processes for managing capital | The Group complies with the standard of capital adequacy provided by financial regulatory authorities. The capital adequacy standard is based on Basel III published by Basel Committee on Banking Supervision in Bank for International Settlement and was implemented in Korea in December 2013. The capital adequacy ratio is calculated by dividing own capital by asset (weighted with a risk premium – risk weighted assets) based on the consolidated financial statements of the Group. | The Group complies with the standard of capital adequacy provided by financial regulatory authorities. The capital adequacy standard is based on Basel III published by Basel Committee on Banking Supervision in Bank for International Settlement and was implemented in Korea in December 2013. The capital adequacy ratio is calculated by dividing own capital by asset (weighted with a risk premium – risk weighted assets) based on the consolidated financial statements of the Group. | |||
| Summary of quantitative data about what entity manages as capital | As of the current and prior year-end, the Group has maintained a Common Equity Tier 1 (CET1) ratio of 9.0%, a Tier 1 capital ratio of 10.5%, and a total capital ratio of at least 12.5% in accordance with the relevant standards. | As of the current and prior year-end, the Group has maintained a Common Equity Tier 1 (CET1) ratio of 9.0%, a Tier 1 capital ratio of 10.5%, and a total capital ratio of at least 12.5% in accordance with the relevant standards. | |||
| Minimum common equity tier one ratio | 9.00% | 9.00% | |||
| Minimum tier one ratio | 10.50% | 10.50% | |||
| Minimum total regulatory capital ratio | 12.50% | 12.50% | |||
| Tier one risk based capital [Abstract] | |||||
| Tier 1 capital | ₩ 30,222,734 | [1] | ₩ 28,522,910 | ||
| Other Tier 1 capital | 4,556,265 | [1] | 4,869,567 | ||
| Tier 2 capital | 3,020,751 | [1] | 3,535,362 | ||
| Total risk adjusted capital | 37,799,750 | [1] | 36,927,839 | ||
| Risk weighted assets for credit risk | 209,094,901 | [1] | 210,365,462 | ||
| Risk weighted assets for market risk | 3,101,409 | [1] | 3,125,478 | ||
| Risk weighted assets for operational risk | 22,345,759 | [1] | 21,609,530 | ||
| Total risk weighted assets | ₩ 234,542,069 | [1] | ₩ 235,100,470 | ||
| Common Equity Tier 1 ratio | 12.89% | [1] | 12.13% | ||
| Tier 1 capital ratio | 14.83% | [1] | 14.20% | ||
| Total capital ratio | 16.12% | [1] | 15.71% | ||
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