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Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets ₩ 1,280,334 ₩ 1,248,308  
Investment property (buildings) 1,933,358 1,720,654 ₩ 1,368,453
Lease liabilities      
Lease liability recognized 1,172,038 1,159,369  
Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Investment property (buildings) 0 1  
Lease liabilities      
Current 315,892 332,702  
Non-Current 856,146 826,667  
Lease liability recognized 1,172,038 1,159,369  
Property and building [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets 1,081,067 1,086,133  
Machinery and communication line facilities [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets 50,794 64,443  
Other [member] | Previously stated [member]      
Disclosure of balance sheet information about leases for lessee [Line Items]      
Right-of-use assets ₩ 148,473 ₩ 97,732