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Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of inventories [line items] |  |
Inventories | ₩ 791,677 | ₩ 1,074,634
Merchandise [member] |  |
Disclosure of inventories [line items] |  |
Inventories | 661,253 | 680,439
Others [member] |  |
Disclosure of inventories [line items] |  |
Inventories | 130,424 | 394,195
Gross carrying amount [member] |  |
Disclosure of inventories [line items] |  |
Inventories | 936,115 | 1,188,215
Gross carrying amount [member] | Merchandise [member] |  |
Disclosure of inventories [line items] |  |
Inventories | 805,691 | 794,020
Gross carrying amount [member] | Others [member] |  |
Disclosure of inventories [line items] |  |
Inventories | 130,424 | 394,195
Valuation allowance [member] |  |
Disclosure of inventories [line items] |  |
Inventories | (144,438) | (113,581)
Valuation allowance [member] | Merchandise [member] |  |
Disclosure of inventories [line items] |  |
Inventories | ₩ (144,438) | ₩ (113,581)

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