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Consolidated Subsidiaries - Summary of Changes in Goodwill (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill ₩ 99,156 ₩ 100,093
Goodwill, Beginning 100,093 105,647
Increase 1,859 0
Decrease 0 0
Impairment (2,582)  
Others (214) (5,554)
Goodwill, Ending 99,156 100,093
Acquisition cost    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 101,738 100,093
Goodwill, Beginning 100,093 105,647
Increase 1,859 0
Decrease 0 0
Impairment 0  
Others (214) (5,554)
Goodwill, Ending 101,738 100,093
Less: Accumulated impairment    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill (2,582) 0
Goodwill, Beginning 0 0
Increase 0 0
Decrease 0 0
Impairment (2,582)  
Others 0 0
Goodwill, Ending ₩ (2,582) ₩ 0