Risk Management - Financial assets with contractual cash flows modified during reporting period (Details) - KRW (₩) ₩ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [Abstract] | ||
| Financial assets with contractual cash flows modified during reporting period while loss allowance measured at lifetime expected credit losses, amortised cost before modification | ₩ 107,905 | ₩ 153,361 |
| Financial assets with contractual cash flows modified during reporting period while loss allowance measured at lifetime expected credit losses, modification gain (loss) | 6,951 | 15,335 |
| Financial assets written off during reporting period and still subject to enforcement activity, contractual amount outstanding | ₩ 9,904,152 | 9,018,290 |
| Non-recoverable financial assets still in the process of recovery | ₩ 2,018,638 | |