Categories of Financial Instruments - Financial Assets by Category (Parenthetical) (Detail) - KRW (₩) ₩ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Long-term investment securities | ₩ 3,188,572 | ₩ 1,877,922 |
| Equity instruments at FVOCI [member] | ||
| Disclosure of financial assets [line items] | ||
| Long-term investment securities | ₩ 3,025,988 | ₩ 1,739,133 |