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Changes in government grants (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Government grants [Line Items]    
Government grants ₩ (537,152) ₩ (527,095)
Changes in government grants [Abstract]    
Beginning balance (527,095) (528,840)
Receipt (55,533) (32,878)
Acquisitions 129,451 33,516
Offset the items of depreciation expense and others 38,354 30,867
Disposals 2,441 4,552
Others (124,770) (34,312)
Ending balance (537,152) (527,095)
Cash [Member]    
Changes in government grants [Abstract]    
Receipt (55,533) (32,878)
Others 55,533 32,878
Land [Member]    
Government grants [Line Items]    
Government grants (21,968) (3,204)
Changes in government grants [Abstract]    
Beginning balance (3,204) (3,147)
Disposals 5 14
Others (18,769) (71)
Ending balance (21,968) (3,204)
Buildings [Member]    
Government grants [Line Items]    
Government grants (63,539) (61,188)
Changes in government grants [Abstract]    
Beginning balance (61,188) (63,932)
Offset the items of depreciation expense and others 5,996 5,299
Disposals 28 731
Others (8,375) (3,286)
Ending balance (63,539) (61,188)
Structures [Member]    
Government grants [Line Items]    
Government grants (196,414) (197,641)
Changes in government grants [Abstract]    
Beginning balance (197,641) (193,119)
Offset the items of depreciation expense and others 10,011 9,491
Disposals 1,905 2,597
Others (10,689) (16,610)
Ending balance (196,414) (197,641)
Machinery [Member]    
Government grants [Line Items]    
Government grants (183,188) (111,064)
Changes in government grants [Abstract]    
Beginning balance (111,064) (108,935)
Offset the items of depreciation expense and others 17,390 12,272
Disposals 489 1,210
Others (90,003) (15,611)
Ending balance (183,188) (111,064)
Vehicles [Member]    
Government grants [Line Items]    
Government grants (6,322) (107)
Changes in government grants [Abstract]    
Beginning balance (107) (29)
Offset the items of depreciation expense and others 1,070 25
Disposals 14  
Others (7,299) (103)
Ending balance (6,322) (107)
Equipment [Member]    
Government grants [Line Items]    
Government grants (761) (732)
Changes in government grants [Abstract]    
Beginning balance (732) (1,026)
Offset the items of depreciation expense and others 454 452
Others (483) (158)
Ending balance (761) (732)
Tools [Member]    
Government grants [Line Items]    
Government grants (1,027) (430)
Changes in government grants [Abstract]    
Beginning balance (430) (691)
Offset the items of depreciation expense and others 354 295
Others (951) (34)
Ending balance (1,027) (430)
Construction in progress [Member]    
Government grants [Line Items]    
Government grants (49,084) (135,807)
Changes in government grants [Abstract]    
Beginning balance (135,807) (139,898)
Acquisitions 129,451 32,525
Others (42,728) (28,434)
Ending balance (49,084) (135,807)
Finance lease assets [Member]    
Government grants [Line Items]    
Government grants (27)  
Changes in government grants [Abstract]    
Offset the items of depreciation expense and others 1  
Others (28)  
Ending balance (27)  
Investment properties [Member]    
Government grants [Line Items]    
Government grants (83) (64)
Changes in government grants [Abstract]    
Beginning balance (64) (13)
Offset the items of depreciation expense and others 2 1
Others (21) (52)
Ending balance (83) (64)
Software [Member]    
Government grants [Line Items]    
Government grants (486) (595)
Changes in government grants [Abstract]    
Beginning balance (595) (699)
Offset the items of depreciation expense and others 255 249
Others (146) (145)
Ending balance (486) (595)
Development expenditures [Member]    
Government grants [Line Items]    
Government grants (3,702) (5,152)
Changes in government grants [Abstract]    
Beginning balance (5,152) (6,835)
Offset the items of depreciation expense and others 2,811 2,771
Others (1,361) (1,088)
Ending balance (3,702) (5,152)
Intangible assets under development [Member]    
Government grants [Line Items]    
Government grants (10,540) (11,090)
Changes in government grants [Abstract]    
Beginning balance (11,090) (10,483)
Acquisitions   991
Others 550 (1,598)
Ending balance (10,540) (11,090)
Usage rights of donated assets and other [Member]    
Government grants [Line Items]    
Government grants (11) (21)
Changes in government grants [Abstract]    
Beginning balance (21) (32)
Offset the items of depreciation expense and others 10 11
Ending balance ₩ (11) (21)
Others [Member]    
Government grants [Line Items]    
Government grants   (1)
Changes in government grants [Abstract]    
Beginning balance   (1)
Offset the items of depreciation expense and others   ₩ 1