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Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets ₩ 788,497 ₩ 899,783    
Investment property 1,387,430 46,666 ₩ 1,091,084 ₩ 1,189,531
Lease liabilities        
Current 336,530 336,530    
Non-Current 470,703 470,703    
Lease liability recognized 807,233 807,233 ₩ 163,858  
Previously stated [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets 788,497      
Investment property 50,010      
Lease liabilities        
Current 355,833      
Non-Current 373,306      
Lease liability recognized 729,139      
Property and building [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets   559,813    
Property and building [member] | Previously stated [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets 540,787      
Machinery and track facilities [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets   234,507    
Machinery and track facilities [member] | Previously stated [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets 140,296      
Other [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets   ₩ 105,463    
Other [member] | Previously stated [member]        
Disclosure of balance sheet information about leases for lessee [Line Items]        
Right-of-use assets ₩ 107,414