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Borrowings and Debt Securities : Short-term borrowings (Details)
₱ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2018
KRW (₩)
Dec. 31, 2017
KRW (₩)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
PHP (₱)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Disclosure of detailed information about Short-term borrowings [Line Items]            
Short-term borrowings ₩ 860,602 ₩ 1,038,328        
Local short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor KTB Investment and securities and others KTB Investment and securities and others        
Borrowings interest rate 2.05~2.51 1.57~2.47        
Borrowings, maturity 2019.01.04~ 2019.02.20 2018.01.12~ 2018.09.19        
Short-term borrowings ₩ 674,000 ₩ 686,561        
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor SCNT and others SCNT and others        
Borrowings interest rate 4.60~6.50 4.60~6.50        
Borrowings, maturity 2019.12.03 2018.12.03        
Short-term borrowings ₩ 10,013 ₩ 9,594 $ 8,955   $ 8,955  
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor BDO Unibank Export-import Bank of Korea        
Borrowings interest rate 6.59 3M Libor+0.41~0.63        
Borrowings, maturity 2020.12.17 (*) The contractual maturity is 2020 but is classified as short-term borrowing due to intention of early payment in 3 months after borrowing. 2018.12.18        
Short-term borrowings ₩ 9,581 ₩ 273,314   ₱ 450,000   $ 327,259
Local bank overdraft            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Nonghyup Bank Nonghyup Bank        
Borrowings interest rate 2.59~3.09 3.04        
Borrowings, maturity 2019.01.10~ 2019.12.31 2018.01.02        
Short-term borrowings ₩ 142,773 ₩ 51,300        
Local bank overdraft            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Woori Bank Woori Bank        
Borrowings interest rate Standard overdraft rate+1.09 Standard overdraft rate+1.12        
Borrowings, maturity 2019.02.26 2018.02.27        
Short-term borrowings ₩ 24,235 ₩ 17,559