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Leases - Summary of statement of profit or loss information about leases for lessee (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Disclosure of statement of profit or loss information about leases for lessee [Line Items]  
Depreciation of Right-of-use assets ₩ 452,056
Depreciation of Investment Properties 21,809
Interest expense relating to lease liabilities 44,799
Expense relating to short-term leases 14,718
Expense relating to leases of low-value assets that are not short-term leases 26,575
Expense relating to variable lease payments not included in lease liabilities 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 310,202
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 89,452
Other [member]  
Disclosure of statement of profit or loss information about leases for lessee [Line Items]  
Depreciation of Right-of-use assets ₩ 52,402