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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | ₩ 26,234,206 | ₩ 25,205,659 | ₩ 24,440,647
Non-current assets | 21,115,704 | 20,881,181 |
Domestic [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 26,074,349 | 25,114,719 | 24,368,729
Non-current assets | 20,845,214 | 20,627,543 |
Overseas [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 159,857 | 90,940 | ₩ 71,918
Non-current assets | ₩ 270,490 | ₩ 253,638 |

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