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Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials ₩ 3,526,006 ₩ 3,181,388
Merchandise 107 20
Work-in-progress 137,681 118,640
Finished goods 71,406 57,659
Supplies 1,577,721 1,284,607
Inventories in transit 679,358 827,437
Other inventories 9,807 9,692
Total Inventories 6,002,086 5,479,443
Acquisition cost [Member]    
Inventory [Line Items]    
Raw materials 3,528,835 3,182,711
Merchandise 107 20
Work-in-progress 138,709 118,640
Finished goods 72,923 57,659
Supplies 1,581,661 1,289,160
Inventories in transit 679,358 827,437
Other inventories 9,807 9,692
Total Inventories 6,011,400 5,485,319
Valuation allowance [Member]    
Inventory [Line Items]    
Raw materials (2,829) (1,323)
Work-in-progress (1,028)  
Finished goods (1,517)  
Supplies (3,940) (4,553)
Total Inventories ₩ (9,314) ₩ (5,876)