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Inventories - Summary of Inventories Net (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of inventories [line items]    
Inventories ₩ 534,636 ₩ 791,677
Merchandise [member]    
Disclosure of inventories [line items]    
Inventories 517,632 661,253
Others [member]    
Disclosure of inventories [line items]    
Inventories 17,004 130,424
Gross carrying amount [member]    
Disclosure of inventories [line items]    
Inventories 667,860 936,115
Gross carrying amount [member] | Merchandise [member]    
Disclosure of inventories [line items]    
Inventories 650,856 805,691
Gross carrying amount [member] | Others [member]    
Disclosure of inventories [line items]    
Inventories 17,004 130,424
Valuation allowance [member]    
Disclosure of inventories [line items]    
Inventories (133,224) (144,438)
Valuation allowance [member] | Merchandise [member]    
Disclosure of inventories [line items]    
Inventories ₩ (133,224) ₩ (144,438)