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Inventories - Summary of Inventories Net (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
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)