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Borrowings and Debt Securities : Short-term borrowings (Details)
$ in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
AUD ($)
Disclosure of detailed information about Short-term borrowings [Line Items]            
Short-term borrowings ₩ 1,038,328 ₩ 805,523        
Local short-term borrowings 1 [Member]            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor   Woori Investment Bank and others        
Borrowings interest rate   1.54~2.51        
Borrowings, maturity   2017.01.25~2017.09.13        
Short-term borrowings   ₩ 436,800        
Local short-term borrowings 2 [Member]            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor KTB Investment and securities and others          
Borrowings interest rate 1.57~2.47          
Borrowings, maturity 2018.01.12~ 2018.09.19          
Short-term borrowings ₩ 686,561          
Foreign short-term borrowings 1 [Member]            
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 1.58~6.50        
Borrowings, maturity 2018.12.03 2017.03.30~2017.12.03        
Short-term borrowings ₩ 9,594 ₩ 42,401 $ 8,955   $ 35,086  
Foreign short-term borrowings 2 [Member]            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Export-import Bank of Korea Export-import Bank of Korea        
Borrowings interest rate 3M Libor+0.41~0.63 3M Libor+0.54~0.63        
Borrowings, maturity 2018.12.18 2017.05.17~2017.12.18        
Short-term borrowings ₩ 273,314 ₩ 271,360   $ 327,259   $ 311,174
Local bank overdraft 1 [Member]            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Nonghyup Bank Nonghyup Bank        
Borrowings interest rate 3.04 2.45        
Borrowings, maturity 2018.01.02 2017.01.05        
Short-term borrowings ₩ 51,300 ₩ 37,000        
Local bank overdraft 2 [Member]            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Woori Bank Woori Bank        
Borrowings interest rate Standard overdraft rate+1.12 Standard overdraft rate+1.12        
Borrowings, maturity 2018.02.27 2017.02.25        
Short-term borrowings ₩ 17,559 ₩ 17,962