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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, 2020
Dec. 31, 2019
Disclosure of statement of profit or loss information about leases for lessee [Line Items]    
Depreciation of Right-of-use assets ₩ 404,175 ₩ 442,629
Depreciation of Investment Properties 19,113 21,809
Interest expense relating to lease liabilities 44,091 55,001
Expense relating to short-term leases 10,998 14,718
Expense relating to leases of low-value assets that are not short-term leases 25,894 26,575
Expense relating to variable lease payments not included in lease liabilities 8,096 5,993
Property and building [member]    
Disclosure of statement of profit or loss information about leases for lessee [Line Items]    
Depreciation of Right-of-use assets 290,168 300,773
Machinery and track facilities [member]    
Disclosure of statement of profit or loss information about leases for lessee [Line Items]    
Depreciation of Right-of-use assets 58,419 89,452
Other [member]    
Disclosure of statement of profit or loss information about leases for lessee [Line Items]    
Depreciation of Right-of-use assets ₩ 55,588 ₩ 52,402