Income Tax Expense - Details of Temporary Differences, Unused Tax Loss Carryforwards and Unused Tax Credits Carryforwards Which are Not Recognized as Deferred Tax Assets (Detail) - KRW (₩) ₩ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] | ||
| Investments in subsidiaries, associates and joint ventures | ₩ 713,493 | ₩ 481,135 |
| Unused tax loss carryforwards | 99,525 | 126,553 |
| Loss allowance [Member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] | ||
| Temporary differences | 79,201 | 77,433 |
| Others [Member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] | ||
| Temporary differences | ₩ 51,394 | ₩ 103,405 |