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Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Raw materials ₩ 3,789,013 ₩ 3,884,130
Merchandise 340  
Work-in-progress 165,073 188,879
Finished goods 58,280 50,526
Supplies 2,116,994 1,854,844
Inventories in transit 906,267 1,196,113
Other inventories 14,733 13,761
Total Inventories 7,050,700 7,188,253
Acquisition cost    
Inventory [Line Items]    
Raw materials 3,790,443 3,886,739
Merchandise 340  
Work-in-progress 165,073 189,907
Finished goods 58,280 50,526
Supplies 2,121,363 1,858,751
Inventories in transit 906,267 1,196,113
Other inventories 14,733 13,761
Total Inventories 7,056,499 7,195,797
Valuation allowance    
Inventory [Line Items]    
Raw materials (1,430) (2,609)
Work-in-progress   (1,028)
Finished goods   0
Supplies (4,369) (3,907)
Inventories in transit   0
Other inventories   0
Total Inventories ₩ (5,799) ₩ (7,544)