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Other Financial Assets - Summary of Loans and Receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value ₩ 88,406 ₩ 78,806
Short-term loans and receivables Allowance for doubtful accounts (10) (1)
Short-term loans and receivables Present value discount (807) (842)
Short-term loans and receivables 87,589 77,963
Long-term loans and receivables Face value 903,397 762,555
Long-term loans and receivables Allowance for doubtful accounts (52,667) (20,266)
Long-term loans and receivables Present value discount (29,248) (30,090)
Long-term loans and receivables 821,482 712,199
Loans and receivables Face value 991,803 841,361
Loans and receivables Allowance for doubtful accounts (52,677) (20,267)
Loans and receivables Present value discount (30,055) (30,932)
Loans and receivables 909,071 790,162
Loans for tuition    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 28,975 33,864
Short-term loans and receivables Allowance for doubtful accounts 0 0
Short-term loans and receivables Present value discount (807) (842)
Short-term loans and receivables 28,168 33,022
Long-term loans and receivables Face value 431,002 420,274
Long-term loans and receivables Allowance for doubtful accounts (37,783) (9,091)
Long-term loans and receivables Present value discount (29,248) (30,090)
Long-term loans and receivables 363,971 381,093
Loans for housing    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 25,750 21,988
Short-term loans and receivables Allowance for doubtful accounts 0 0
Short-term loans and receivables Present value discount 0 0
Short-term loans and receivables 25,750 21,988
Long-term loans and receivables Face value 282,833 237,100
Long-term loans and receivables Allowance for doubtful accounts 0 0
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables 282,833 237,100
Loans for related parties    
Loans And Leases Receivable Disclosure [Line Items]    
Long-term loans and receivables Face value 150,541 50,682
Long-term loans and receivables Allowance for doubtful accounts (14,861) (1,047)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables 135,680 49,635
Fisheries loan    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value   3,816
Short-term loans and receivables Allowance for doubtful accounts   0
Short-term loans and receivables Present value discount   0
Short-term loans and receivables   3,816
Long-term loans and receivables Face value 203  
Long-term loans and receivables Allowance for doubtful accounts 0  
Long-term loans and receivables Present value discount 0  
Long-term loans and receivables 203  
Other loans    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 33,681 19,138
Short-term loans and receivables Allowance for doubtful accounts (10) (1)
Short-term loans and receivables Present value discount 0 0
Short-term loans and receivables 33,671 19,137
Long-term loans and receivables Face value 38,818 54,499
Long-term loans and receivables Allowance for doubtful accounts (23) (10,128)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables ₩ 38,795 ₩ 44,371