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Other-Financial Assets : Loans and receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value ₩ 64,111 ₩ 123,657
Short-term loans and receivables Allowance for doubtful accounts (31) (12)
Short-term loans and receivables Present value discount (847) (992)
Short-term loans and receivables 63,233 122,653
Long-term loans and receivables Face value 725,755 639,673
Long-term loans and receivables Allowance for doubtful accounts (15,063) (4,940)
Long-term loans and receivables Present value discount (35,218) (38,712)
Long-term loans and receivables 675,474 596,021
Loans and receivables Face value 789,866 763,330
Loans and receivables Allowance for doubtful accounts (15,094) (4,952)
Loans and receivables Present value discount (36,065) (39,704)
Loans and receivables 738,707 718,674
Loans for tuition    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 33,636 33,333
Short-term loans and receivables Allowance for doubtful accounts 0 0
Short-term loans and receivables Present value discount (847) (992)
Short-term loans and receivables 32,789 32,341
Long-term loans and receivables Face value 419,905 414,893
Long-term loans and receivables Allowance for doubtful accounts 0 0
Long-term loans and receivables Present value discount (35,197) (38,659)
Long-term loans and receivables 384,708 376,234
Loans for housing    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 17,113 15,572
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 17,113 15,572
Long-term loans and receivables Face value 199,454 167,723
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 199,454 167,723
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 89,132 46,798
Long-term loans and receivables Allowance for doubtful accounts (4,930) (4,930)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables 84,202 41,868
Fisheries loan    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 0 320
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 0 320
Long-term loans and receivables Face value 17,264 640
Long-term loans and receivables Allowance for doubtful accounts (10,133) 0
Long-term loans and receivables Present value discount (21) (53)
Long-term loans and receivables 7,110 587
Other loans    
Loans and Leases Receivable Disclosure [Line Items]    
Short-term loans and receivables Face value 13,362 74,432
Short-term loans and receivables Allowance for doubtful accounts (31) (12)
Short-term loans and receivables Present value discount 0 0
Short-term loans and receivables 13,331 74,420
Long-term loans and receivables Face value 0 9,619
Long-term loans and receivables Allowance for doubtful accounts 0 (10)
Long-term loans and receivables Present value discount 0 0
Long-term loans and receivables ₩ 0 ₩ 9,609