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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | ₩ 26,595,245 | ₩ 26,234,206 | ₩ 25,205,659
Non-current assets | 20,909,038 | 21,115,704 |
Domestic [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 26,425,735 | 26,074,349 | 25,114,719
Non-current assets | 20,725,694 | 20,845,214 |
Overseas [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 169,510 | 159,857 | ₩ 90,940
Non-current assets | ₩ 183,344 | ₩ 270,490 |

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