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Non-financial Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Liabilities Disclosure [Abstract] |
Non-financial Liabilities | Non-financial liabilities as of December 31, 2019 and 2020 are as follows:
|  |  |  |  | 2019 |  |  | 2020 |
|  |  |  |  | Current |  |  | Non-current |  |  | Current |  |  | Non-current |
|  |  |  |  | In millions of won |
Advance received |  | ￦ |  |  |  |  | 3,825,240 |  |  |  | 192,863 |  |  |  | 3,693,043 |  |  |  | 331,596 |
Unearned revenue |  |  |  |  |  |  | 30,988 |  |  |  | 6,589 |  |  |  | 35,068 |  |  |  | 6,122 |
Deferred revenue |  |  |  |  |  |  | 590,928 |  |  |  | 8,610,610 |  |  |  | 625,596 |  |  |  | 9,242,593 |
Withholdings |  |  |  |  |  |  | 160,977 |  |  |  | 10,901 |  |  |  | 257,059 |  |  |  | 9,909 |
Others |  |  |  |  |  |  | 1,080,220 |  |  |  | 13,489 |  |  |  | 1,360,684 |  |  |  | 71,721 |
|  | ￦ |  |  |  |  | 5,688,353 |  |  |  | 8,834,452 |  |  |  | 5,971,450 |  |  |  | 9,661,941 |

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