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Segment Information - Summary of Operating Revenues and Non Current Assets by Geographical Regions (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | ₩ 26,724,473 | ₩ 26,595,245 | ₩ 26,234,206
Non-current assets | 20,200,940 | 20,909,038 |
Domestic [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 26,547,275 | 26,425,735 | 26,074,349
Non-current assets | 20,021,125 | 20,725,694 |
Overseas [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 177,198 | 169,510 | ₩ 159,857
Non-current assets | ₩ 179,815 | ₩ 183,344 |

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