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Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of balance sheet information about leases for lessee [Line Items]    
Right-of-use assets ₩ 1,304,963 ₩ 1,280,334
Lease liabilities    
Lease liability recognized 1,179,909 1,172,038
Previously stated [member]    
Lease liabilities    
Current 307,868 315,892
Non-Current 872,042 856,146
Lease liability recognized 1,179,910 1,172,038
Property and building [member] | Previously stated [member]    
Disclosure of balance sheet information about leases for lessee [Line Items]    
Right-of-use assets 1,019,537 1,081,067
Machinery and communication line facilities [member] | Previously stated [member]    
Disclosure of balance sheet information about leases for lessee [Line Items]    
Right-of-use assets 89,150 50,794
Other [member] | Previously stated [member]    
Disclosure of balance sheet information about leases for lessee [Line Items]    
Right-of-use assets ₩ 196,276 ₩ 148,473