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Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets ₩ 1,217,179 ₩ 1,268,329  
Investment property 1,368,453 1,387,430 ₩ 1,091,084
Lease liabilities      
Current   392,433  
Non-Current   818,919  
Lease liability recognized 1,143,640 1,211,352  
Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets 585,034 788,497  
Investment property 19,456    
Lease liabilities      
Current 281,961 355,833  
Non-Current 798,416 373,307  
Lease liability recognized 1,143,640    
Property and building [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets   1,020,619  
Property and building [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets 1,073,207    
Machinery and track facilities [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets   140,296  
Machinery and track facilities [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets 42,127    
Other [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets   ₩ 107,414  
Other [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets ₩ 101,845