Statements of cash flows - Summary of restricted cash and cash equivalents (Details) - KRW (₩) ₩ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure Of Restricted Cash And Cash Equivalents [Line Items] | ||
| Restricted cash and cash equivalents | ₩ 23,475,057 | ₩ 12,667,062 |
| Due In Local Currency From Bank of Korea | ||
| Disclosure Of Restricted Cash And Cash Equivalents [Line Items] | ||
| Restricted cash and cash equivalents | 16,555,802 | 9,712,194 |
| Due In Foreign Currency From Banks On Demand | ||
| Disclosure Of Restricted Cash And Cash Equivalents [Line Items] | ||
| Restricted cash and cash equivalents | ₩ 6,919,255 | ₩ 2,954,868 |