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Other-Financial Assets : Loans and receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value ₩ 78,806 ₩ 64,111
Short-term loans and receivables Allowance for doubtful accounts (1) (31)
Short-term loans and receivables Present value discount (842) (847)
Short-term loans and receivables 77,963 63,233
Long-term loans and receivables Face value 762,555 725,755
Long-term loans and receivables Allowance for doubtful accounts (20,266) (15,063)
Long-term loans and receivables Present value discount (30,090) (35,218)
Long-term loans and receivables 712,199 675,474
Loans and receivables Face value 841,361 789,866
Loans and receivables Allowance for doubtful accounts (20,267) (15,094)
Loans and receivables Present value discount (30,932) (36,065)
Loans and receivables 790,162 738,707
Loans for tuition    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 33,864 33,636
Short-term loans and receivables Allowance for doubtful accounts 0 0
Short-term loans and receivables Present value discount (842) (847)
Short-term loans and receivables 33,022 32,789
Long-term loans and receivables Face value 420,274 419,905
Long-term loans and receivables Allowance for doubtful accounts (9,091) 0
Long-term loans and receivables Present value discount (30,090) (35,197)
Long-term loans and receivables 381,093 384,708
Loans for housing    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 21,988 17,113
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 21,988 17,113
Long-term loans and receivables Face value 237,100 199,454
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 237,100 199,454
Loans for related parties    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 0 0
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 0 0
Long-term loans and receivables Face value 50,682 89,132
Long-term loans and receivables Allowance for doubtful accounts (1,047) (4,930)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables 49,635 84,202
Fisheries loan    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 3,816 0
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 3,816 0
Long-term loans and receivables Face value 0 0
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   0
Other loans    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 19,138 13,362
Short-term loans and receivables Allowance for doubtful accounts (1) (31)
Short-term loans and receivables Present value discount 0 0
Short-term loans and receivables 19,137 13,331
Long-term loans and receivables Face value 54,499 17,264
Long-term loans and receivables Allowance for doubtful accounts (10,128) (10,133)
Long-term loans and receivables Present value discount 0 (21)
Long-term loans and receivables ₩ 44,371 ₩ 7,110