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Intangible Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items] |  |
Indefinite useful life | ₩ 203,240 | ₩ 239,619
Individual assets or cash-generating units [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Impairment loss | ₩ 38,519 |
Discount rate | 7.30% |

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