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Leases - Summary of statement of profit or loss information about leases for lessee (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets ₩ 402,737 ₩ 396,214 ₩ 398,716
Depreciation of Investment Properties 0 15 1,794
Interest expense relating to lease liabilities 52,035 41,469 36,651
Expense relating to short-term leases 8,804 12,876 7,984
Expense relating to leases of low-value assets that are not short-term leases 26,290 26,813 26,033
Expense relating to variable lease payments not included in lease liabilities 9,288 4,827 8,400
Property and building [member]      
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets 297,571 305,120 303,984
Machinery and communication line facilities [member]      
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets 32,794 31,140 41,794
Other [member]      
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets ₩ 72,372 ₩ 59,954 ₩ 52,938