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Other Financial Assets - Summary of Loans and Receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value ₩ 132,890 ₩ 88,406
Short-term loans and receivables Allowance for doubtful accounts (13) (10)
Short-term loans and receivables Present value discount (816) (807)
Short-term loans and receivables 132,061 87,589
Long-term loans and receivables Face value 968,468 903,397
Long-term loans and receivables Allowance for doubtful accounts (54,824) (52,667)
Long-term loans and receivables Present value discount (32,334) (29,248)
Long-term loans and receivables 881,310 821,482
Loans and receivables Face value 1,101,358 991,803
Loans and receivables Allowance for doubtful accounts (54,837) (52,677)
Loans and receivables Present value discount (33,150) (30,055)
Loans and receivables 1,013,371 909,071
Loans for tuition    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 30,261 28,975
Short-term loans and receivables Allowance for doubtful accounts 0 0
Short-term loans and receivables Present value discount (816) (807)
Short-term loans and receivables 29,445 28,168
Long-term loans and receivables Face value 436,131 431,002
Long-term loans and receivables Allowance for doubtful accounts (37,783) (37,783)
Long-term loans and receivables Present value discount (32,334) (29,248)
Long-term loans and receivables 366,014 363,971
Loans for housing    
Loans And Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 29,630 25,750
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 29,630 25,750
Long-term loans and receivables Face value 309,446 282,833
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 309,446 282,833
Loans for related parties    
Loans And Leases Receivable Disclosure [Line Items]    
Long-term loans and receivables Face value 187,728 150,541
Long-term loans and receivables Allowance for doubtful accounts (17,041) (14,861)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables 170,687 135,680
Fisheries loan    
Loans And Leases Receivable Disclosure [Line Items]    
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 72,999 33,681
Short-term loans and receivables Allowance for doubtful accounts (13) (10)
Short-term loans and receivables Present value discount 0 0
Short-term loans and receivables 72,986 33,671
Long-term loans and receivables Face value 35,163 38,818
Long-term loans and receivables Allowance for doubtful accounts 0 (23)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables ₩ 35,163 ₩ 38,795