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Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure - Other liabilities [Line Items] |  |  |
Deferred revenue | ₩ 9,868,189 | ₩ 9,201,538 | ₩ 8,606,563
Other Current Liabilities |  |  |
Disclosure - Other liabilities [Line Items] |  |  |
Advances received | 3,693,043 | 3,825,240 |
Unearned revenue | 35,068 | 30,988 |
Deferred revenue | 625,596 | 590,928 |
Withholdings | 257,059 | 160,977 |
Other nonfincial liabilities | 1,360,684 | 1,080,220 |
Total | 5,971,450 | 5,688,353 |
Other Noncurrent Liabilities |  |  |
Disclosure - Other liabilities [Line Items] |  |  |
Advances received | 331,596 | 192,863 |
Unearned revenue | 6,122 | 6,589 |
Deferred revenue | 9,242,593 | 8,610,610 |
Withholdings | 9,909 | 10,901 |
Other nonfincial liabilities | 71,721 | 13,489 |
Total | ₩ 9,661,941 | ₩ 8,834,452 |

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