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Investment properties, net (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [Line Items]      
Beginning balance ₩ 159,559 ₩ 284,714 ₩ 353,680
Depreciation (5,069) (923) (1,176)
Others 4,090 [1] (124,232) (67,790)
Endings balance 158,580 159,559 284,714
Carrying Amount Other than Government Grants      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 159,609 284,797  
Depreciation (5,070) (924)  
Others 4,054 [1] (124,264)  
Endings balance 158,593 159,609 284,797
Acquisition cost      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 174,741 300,370  
Endings balance 194,487 174,741 300,370
Accumulated depreciation      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance (15,132) (15,573)  
Endings balance (35,894) (15,132) (15,573)
Government grants      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance (50) (83)  
Depreciation 1 1  
Others 36 [1] 32  
Endings balance (13) (50) (83)
Investment property - Land      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 139,940 264,205  
Depreciation   (0)  
Others (10,043) [1] (124,265)  
Endings balance 129,897 139,940 264,205
Investment property - Land | Carrying Amount Other than Government Grants      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 139,940 264,205  
Others (10,043) [1] (124,265)  
Endings balance 129,897 139,940 264,205
Investment property - Land | Acquisition cost      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 139,940 264,205  
Endings balance 129,897 139,940 264,205
Investment property - Buildings      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 19,619 20,509  
Depreciation (5,069) (923)  
Others 14,133 [1] 33  
Endings balance 28,683 19,619 20,509
Investment property - Buildings | Carrying Amount Other than Government Grants      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 19,669 20,592  
Depreciation (5,070) (924)  
Others 14,097 [1] 1  
Endings balance 28,696 19,669 20,592
Investment property - Buildings | Acquisition cost      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance 34,801 36,165  
Endings balance 64,590 34,801 36,165
Investment property - Buildings | Accumulated depreciation      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance (15,132) (15,573)  
Endings balance (35,894) (15,132) (15,573)
Investment property - Buildings | Government grants      
Disclosure of detailed information about investment property [Line Items]      
Beginning balance (50) (83)  
Depreciation 1 1  
Others 36 [1] 32  
Endings balance ₩ (13) ₩ (50) ₩ (83)
[1] As described in Note 42, the Company reclassified land and buildings amounting to KRW2,765 million and KRW19,369 million, respectively, from assets held-for-sale to investment properties during the year ended December 31, 2019.