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Financial Risk Management - Net Borrowing-to-Equity Ratio (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of nature and extent of risks arising from financial instruments [abstract] |  |  |  |
Total borrowings | ₩ 28,492,000 | ₩ 25,997,367 |  |
Less: Cash and cash equivalents | 7,049,800 | 6,767,898 |  |
Net borrowings | 21,442,200 | 19,229,469 |  |
Total equity | ₩ 62,392,712 | ₩ 61,442,768 | ₩ 59,598,600 | ₩ 58,191,897
Net borrowings-to-equity ratio | 34.36% | 31.30% |  |

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