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Accounts and Other Receivables - Summary of ECLs and Credit Risk Exposures for Accounts and Other Receivables (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Carrying amount | ₩ 60,340 | ₩ 32,419 |  |
Loss allowance | 579 | 165 | ₩ 22 | ₩ 123
Other Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Carrying amount | 13 | 61 |  |
Loss allowance | ₩ 5 | ₩ 4 | ₩ 84 | ₩ 46
Not due or overdue less than 90 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 0.10% | 0.30% |  |
Carrying amount | ₩ 57,661 | ₩ 31,146 |  |
Loss allowance | 54 | ₩ 97 |  |
Not due or overdue less than 90 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate |  | 4.30% |  |
Carrying amount | ₩ 8 | ₩ 57 |  |
Loss allowance |  | ₩ 2 |  |
More than 90 days ~ Less than 180 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 5.00% | 3.60% |  |
Carrying amount | ₩ 2,138 | ₩ 1,213 |  |
Loss allowance | ₩ 107 | ₩ 44 |  |
More than 90 days ~ Less than 180 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate |  | 32.80% |  |
Carrying amount |  | ₩ 2 |  |
Loss allowance |  | ₩ 1 |  |
More than 180 days ~ Less than 270 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 55.30% | 21.10% |  |
Carrying amount | ₩ 276 | ₩ 30 |  |
Loss allowance | ₩ 153 | ₩ 6 |  |
More than 180 days ~ Less than 270 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate |  | 99.60% |  |
Carrying amount |  | ₩ 1 |  |
Loss allowance |  | ₩ 1 |  |
More than 270 days ~ Less than 1 year | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 99.90% | 51.90% |  |
Carrying amount | ₩ 79 | ₩ 24 |  |
Loss allowance | ₩ 79 | ₩ 12 |  |
More than 270 days ~ Less than 1 year | Expected Credit Losses and Credit Risk Exposures | Other Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 100.00% | 100.00% |  |
Carrying amount | ₩ 5 | ₩ 1 |  |
Loss allowance | ₩ 5 |  |  |
More than 1 year | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |
Expected loss rate | 100.00% | 100.00% |  |
Carrying amount | ₩ 186 | ₩ 6 |  |
Loss allowance | ₩ 186 | ₩ 6 |  |

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