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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets ₩ 396,214 ₩ 398,716 ₩ 404,175
Depreciation of Investment Properties 15 1,794 19,113
Interest expense relating to lease liabilities 41,469 36,651 44,091
Expense relating to short-term leases 12,876 7,984 10,998
Expense relating to leases of low-value assets that are not short-term leases 26,813 26,033 25,894
Expense relating to variable lease payments not included in lease liabilities 4,827 8,400 8,096
Property and building [member]      
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets 305,120 303,984 290,168
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 31,140 41,794 58,419
Other [member]      
Disclosure of statement of profit or loss information about leases for lessee [Line Items]      
Depreciation of Right-of-use assets ₩ 59,954 ₩ 52,938 ₩ 55,588