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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |  |
Mobile services | ₩ 6,936,485 | ₩ 6,805,218 | ₩ 6,795,124
Fixed-line services: | 4,960,338 | 4,827,015 | 4,866,698
Fixed-line and VoIP telephone services | 1,465,059 | 1,463,553 | 1,578,546
Broadband Internet access services | 2,343,591 | 2,256,188 | 2,177,447
Data communication services | 1,151,689 | 1,107,274 | 1,110,705
Media and content | 2,800,630 | 2,637,691 | 2,516,256
Financial services | 3,661,896 | 3,493,920 | 3,641,655
Sale of goods | 3,532,973 | 3,593,127 | 4,194,168
Others | 3,313,337 | 3,083,676 | 2,885,288
Total | ₩ 25,205,659 | ₩ 24,440,647 | ₩ 24,899,189

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