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Accounts and Other Receivables - Summary of ECLs and Credit Risk Exposures for Accounts and Other Receivables (Details) ₩ in Millions, $ in Millions | Dec. 31, 2023 KRW (₩) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 KRW (₩) | Dec. 31, 2021 KRW (₩) | Dec. 31, 2020 KRW (₩)
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Loss allowance | Accounts receivable |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | ₩ (626) |  | ₩ (319) | ₩ (689) | ₩ (579)
Loss allowance | Accounts receivable | Not due or overdue less than 90 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 0.60% | 0.60% | 0.10% |  |
Financial assets at amortised cost | ₩ (438) |  | ₩ (85) |  |
Loss allowance | Accounts receivable | More than 90 days ~ Less than 180 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 3.20% | 3.20% | 18.20% |  |
Financial assets at amortised cost | ₩ (10) |  | ₩ (58) |  |
Loss allowance | Accounts receivable | More than 180 days ~ Less than 270 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 57.40% | 57.40% | 46.60% |  |
Financial assets at amortised cost | ₩ (16) |  | ₩ (2) |  |
Loss allowance | Accounts receivable | More than 270 days ~ Less than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 87.30% | 87.30% | 82.30% |  |
Financial assets at amortised cost | ₩ (4) |  | ₩ (33) |  |
Loss allowance | Accounts receivable | More than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 100.00% | 100.00% | 100.00% |  |
Financial assets at amortised cost | ₩ (158) |  | ₩ (141) |  |
Loss allowance | Other receivables |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | ₩ (5) |  | ₩ (5) | ₩ (5) | ₩ (5)
Loss allowance | Other receivables | Not due or overdue less than 90 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 0.00% | 0.00% | 0.00% |  |
Financial assets at amortised cost | ₩ 0 |  | ₩ 0 |  |
Loss allowance | Other receivables | More than 90 days ~ Less than 180 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 0.00% | 0.00% | 0.00% |  |
Financial assets at amortised cost | ₩ 0 |  | ₩ 0 |  |
Loss allowance | Other receivables | More than 180 days ~ Less than 270 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 0.00% | 0.00% | 0.00% |  |
Financial assets at amortised cost | ₩ 0 |  | ₩ 0 |  |
Loss allowance | Other receivables | More than 270 days ~ Less than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 0.00% | 0.00% | 0.00% |  |
Financial assets at amortised cost |  | $ 0 | ₩ 0 |  |
Loss allowance | Other receivables | More than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Expected loss rate | 100.00% | 100.00% | 100.00% |  |
Financial assets at amortised cost |  | $ (5) | ₩ (5) |  |
Acquisition price | Accounts receivable |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | ₩ 71,839 |  | 77,576 |  |
Acquisition price | Accounts receivable | Not due or overdue less than 90 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 71,334 |  | 77,073 |  |
Acquisition price | Accounts receivable | More than 90 days ~ Less than 180 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 315 |  | 318 |  |
Acquisition price | Accounts receivable | More than 180 days ~ Less than 270 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 27 |  | 4 |  |
Acquisition price | Accounts receivable | More than 270 days ~ Less than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 5 |  | 40 |  |
Acquisition price | Accounts receivable | More than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 158 |  | 141 |  |
Acquisition price | Other receivables |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 3,642 |  | 145 |  |
Acquisition price | Other receivables | Not due or overdue less than 90 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 3,637 |  | 140 |  |
Acquisition price | Other receivables | More than 90 days ~ Less than 180 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 0 |  | 0 |  |
Acquisition price | Other receivables | More than 180 days ~ Less than 270 days |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 0 |  | 0 |  |
Acquisition price | Other receivables | More than 270 days ~ Less than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | 0 |  | 0 |  |
Acquisition price | Other receivables | More than 1 year |  |  |  |  |
Trade And Other Receivables [Line Items] |  |  |  |  |
Financial assets at amortised cost | ₩ 5 |  | ₩ 5 |  |

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