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Changes in government grants (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in government grants    
Beginning balance ₩ (506,176) ₩ (522,476)
Receipt (41,209) (21,705)
Acquisitions 8,783 12,338
Offset the items of depreciation expense and others 36,213 37,331
Disposals 2,534 3,196
Others (11,355) (14,860)
Ending balance (511,210) (506,176)
Cash    
Changes in government grants    
Beginning balance 0 0
Receipt (41,209) (21,705)
Acquisitions 0 0
Offset the items of depreciation expense and others 0 0
Disposals 0 0
Others 41,209 21,705
Ending balance 0 0
Land    
Changes in government grants    
Beginning balance (21,817) (21,968)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 0 0
Disposals 2 151
Others (1,660) 0
Ending balance (23,475) (21,817)
Buildings    
Changes in government grants    
Beginning balance (61,920) (63,189)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 5,206 6,214
Disposals 0 0
Others (517) (4,945)
Ending balance (57,231) (61,920)
Structures    
Changes in government grants    
Beginning balance (186,554) (190,854)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 9,526 9,373
Disposals 2,032 2,405
Others (5,013) (7,478)
Ending balance (180,009) (186,554)
Machinery    
Changes in government grants    
Beginning balance (158,907) (173,242)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 17,468 17,993
Disposals 496 635
Others (16,842) (4,293)
Ending balance (157,785) (158,907)
Vehicles    
Changes in government grants    
Beginning balance (2,275) (4,220)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 2,064 2,170
Disposals 4 5
Others (425) (230)
Ending balance (632) (2,275)
Equipment    
Changes in government grants    
Beginning balance (241) (418)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 149 262
Disposals 0 0
Others (135) (85)
Ending balance (227) (241)
Tools    
Changes in government grants    
Beginning balance (403) (675)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 243 281
Disposals 0 0
Others (79) (9)
Ending balance (239) (403)
Construction in progress    
Changes in government grants    
Beginning balance (61,211) (54,740)
Receipt 0 0
Acquisitions 8,783 12,338
Offset the items of depreciation expense and others 0 0
Disposals 0 0
Others (26,698) (18,809)
Ending balance (79,126) (61,211)
Finance lease assets    
Changes in government grants    
Beginning balance 0 (26)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 0 0
Disposals 0 0
Others 0 26
Ending balance 0 0
Investment properties    
Changes in government grants    
Beginning balance (13) (50)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 1 1
Disposals 0 0
Others (17) 36
Ending balance (29) (13)
Software    
Changes in government grants    
Beginning balance (235) (420)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 99 202
Disposals 0 0
Others 0 (17)
Ending balance (136) (235)
Development expenditures    
Changes in government grants    
Beginning balance (1,492) (2,110)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 1,453 833
Disposals 0 0
Others (5,004) (215)
Ending balance (5,043) (1,492)
Intangible assets under development    
Changes in government grants    
Beginning balance (11,029) (10,564)
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 0 0
Disposals 0 0
Others 3,826 (465)
Ending balance (7,203) (11,029)
Others    
Changes in government grants    
Beginning balance (79) 0
Receipt 0 0
Acquisitions 0 0
Offset the items of depreciation expense and others 4 2
Disposals 0 0
Others 0 (81)
Ending balance ₩ (75) ₩ (79)