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Investment properties, net (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about investment property [Line Items]    
Beginning balance ₩ 158,580 ₩ 159,559
Depreciation (1,453) (5,069)
Others 68,068 4,090
Endings balance 225,195 158,580
Carrying Amount Other than Government Grants    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 158,593 159,609
Depreciation (1,454) (5,070)
Others 68,085 4,054
Endings balance 225,224 158,593
Acquisition cost    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 194,487 174,741
Endings balance 259,738 194,487
Accumulated depreciation    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance (35,894) (15,132)
Endings balance (34,514) (35,894)
Government grants    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance (13) (50)
Depreciation 1 1
Others (17) 36
Endings balance (29) (13)
Investment property - Land    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 129,897 139,940
Others 70,494 (10,043)
Endings balance 200,391 129,897
Investment property - Land | Carrying Amount Other than Government Grants    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 129,897 139,940
Others 70,494 (10,043)
Endings balance 200,391 129,897
Investment property - Land | Acquisition cost    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 129,897 139,940
Endings balance 200,391 129,897
Investment property - Buildings    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 28,683 19,619
Depreciation (1,453) (5,069)
Others (2,426) 14,133
Endings balance 24,804 28,683
Investment property - Buildings | Carrying Amount Other than Government Grants    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 28,696 19,669
Depreciation (1,454) (5,070)
Others (2,409) 14,097
Endings balance 24,833 28,696
Investment property - Buildings | Acquisition cost    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance 64,590 34,801
Endings balance 59,347 64,590
Investment property - Buildings | Accumulated depreciation    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance (35,894) (15,132)
Endings balance (34,514) (35,894)
Investment property - Buildings | Government grants    
Disclosure of detailed information about investment property [Line Items]    
Beginning balance (13) (50)
Depreciation 1 1
Others (17) 36
Endings balance ₩ (29) ₩ (13)