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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail explanation of Operating revenue (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |  |
Mobile services | ₩ 6,827,685 |  |
Fixed-line services: | 4,869,253 |  |
Fixed-line and VoIP telephone services | 1,708,319 |  |
Broadband Internet access services | 2,112,763 |  |
Data communication services | 1,048,171 |  |
Media and content | 3,182,324 |  |
Financial services | 3,444,917 |  |
Sale of goods | 3,288,911 |  |
Others | 1,822,960 |  |
Operating revenue | ₩ 23,436,050 | ₩ 23,546,929 | ₩ 23,164,202

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