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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | ₩ 25,205,659 | ₩ 24,440,647 | ₩ 24,899,189
Non-current assets | 20,881,181 | 18,953,009 |
Domestic [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 25,114,719 | 24,368,729 | 24,832,068
Non-current assets | 20,627,543 | 18,934,766 |
Overseas [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 90,940 | 71,918 | ₩ 67,121
Non-current assets | ₩ 253,638 | ₩ 18,243 |

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