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Investment Properties - Summary of Investment Properties and Changes in Investment Properties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 225,195 ₩ 158,580
Depreciation (1,386) (1,453)
Others (11,025) 68,068
Endings balance 212,784 225,195
Acquisition cost    
Disclosure of detailed information about investment property [line items]    
Beginning balance 259,738  
Endings balance 221,148 259,738
Accumulated depreciation    
Disclosure of detailed information about investment property [line items]    
Beginning balance (34,514)  
Endings balance (8,334) (34,514)
Government grants    
Disclosure of detailed information about investment property [line items]    
Beginning balance (29) (13)
Depreciation 1 1
Others (2) (17)
Endings balance (30) (29)
Investment property - Land    
Disclosure of detailed information about investment property [line items]    
Beginning balance 200,391  
Endings balance 201,605 200,391
Investment property - Land | Carrying Amount Other than Government Grants    
Disclosure of detailed information about investment property [line items]    
Beginning balance 200,391 129,897
Depreciation 0 0
Others 1,214 70,494
Endings balance 201,605 200,391
Investment property - Land | Acquisition cost    
Disclosure of detailed information about investment property [line items]    
Beginning balance 200,391  
Endings balance 201,605 200,391
Investment property - Land | Accumulated depreciation    
Disclosure of detailed information about investment property [line items]    
Beginning balance 0  
Endings balance 0 0
Investment property - Land | Government grants    
Disclosure of detailed information about investment property [line items]    
Beginning balance 0  
Endings balance 0 0
Investment property - Buildings    
Disclosure of detailed information about investment property [line items]    
Beginning balance 24,804  
Endings balance 11,179 24,804
Investment property - Buildings | Carrying Amount Other than Government Grants    
Disclosure of detailed information about investment property [line items]    
Beginning balance 24,833 28,696
Depreciation (1,387) (1,454)
Others (12,237) (2,409)
Endings balance 11,209 24,833
Investment property - Buildings | Acquisition cost    
Disclosure of detailed information about investment property [line items]    
Beginning balance 59,347  
Endings balance 19,543 59,347
Investment property - Buildings | Accumulated depreciation    
Disclosure of detailed information about investment property [line items]    
Beginning balance (34,514)  
Endings balance (8,334) (34,514)
Investment property - Buildings | Government grants    
Disclosure of detailed information about investment property [line items]    
Beginning balance (29)  
Endings balance ₩ (30) ₩ (29)