Provisions - Summary Of Details Of Provisions (Details) - KRW (₩) ₩ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
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| Disclosure of other provisions [line items] | ||||||||||
| Provisions | ₩ 790,733 | ₩ 611,428 | ||||||||
| Asset retirement obligation | ||||||||||
| Disclosure of other provisions [line items] | ||||||||||
| Provisions | 106,786 | 97,772 | ||||||||
| Provision for guarantees | ||||||||||
| Disclosure of other provisions [line items] | ||||||||||
| Provisions | 79,317 | [1] | 71,470 | [1] | ₩ 80,703 | ₩ 76,508 | ||||
| Provision for financial guarantee contract | 52,733 | 48,785 | ||||||||
| Provisions for unused loan commitments | ||||||||||
| Disclosure of other provisions [line items] | ||||||||||
| Provisions | 137,081 | 137,562 | ₩ 135,335 | ₩ 106,033 | ||||||
| Other provisions | ||||||||||
| Disclosure of other provisions [line items] | ||||||||||
| Provisions | [2] | ₩ 467,549 | ₩ 304,624 | |||||||
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