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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | ₩ 24,440,647 | ₩ 24,899,189 | ₩ 23,436,050
Non-current assets | 18,953,009 | 19,275,095 |
Domestic [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 24,368,729 | 24,832,068 | 23,376,218
Non-current assets | 18,934,766 | 19,198,416 |
Overseas [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Operating revenues | 71,918 | 67,121 | ₩ 59,832
Non-current assets | ₩ 18,243 | ₩ 76,679 |

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