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Borrowings and Debt Securities : Short-term borrowings (Details)
₱ in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
PHP (₱)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
PHP (₱)
Disclosure of detailed information about Short-term borrowings [Line Items]            
Short-term borrowings ₩ 1,098,555 ₩ 860,602        
Local short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor   KTB Investment and securities and others        
Borrowings interest rate   2.05~2.51        
Borrowings, maturity   2019.01.04~ 2019.02.20        
Short-term borrowings   ₩ 674,000        
Local short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor DB financial investment and others          
Borrowings interest rate 2.00~2.20          
Borrowings, maturity 2020.01.13~ 2020.02.05          
Short-term borrowings ₩ 280,000          
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor   SCNT and others        
Borrowings interest rate   4.60~6.50        
Borrowings, maturity   2019.12.03        
Short-term borrowings   ₩ 10,013     $ 8,955  
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor BDO Unibank BDO Unibank        
Borrowings interest rate 3.92 6.59        
Borrowings, maturity 2020.12.20 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.        
Short-term borrowings ₩ 5,130 ₩ 9,581   ₱ 225,000   ₱ 450,000
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor LG-CNS          
Borrowings interest rate 4.6          
Borrowings, maturity 2020.06.30          
Short-term borrowings ₩ 27,439   $ 23,699      
Foreign short-term borrowings            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Mizuho Bank          
Borrowings interest rate 4.6          
Borrowings, maturity 2020.06.30          
Short-term borrowings ₩ 12,767   $ 11,027      
Local bank overdraft            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor   Nonghyup Bank        
Borrowings interest rate   2.59~3.09        
Borrowings, maturity   2019.01.10~ 2019.12.31        
Short-term borrowings   ₩ 142,773        
Local bank overdraft            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor   Woori Bank        
Borrowings interest rate   Standard overdraft rate+1.09        
Borrowings, maturity   2019.02.26        
Short-term borrowings   ₩ 24,235        
Local bank overdraft            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Korea development Bank and others          
Borrowings interest rate 1.98~2.75          
Borrowings, maturity 2020.01.01 ~2020.04.16          
Short-term borrowings ₩ 373,219          
Electronic short-term bonds            
Disclosure of detailed information about Short-term borrowings [Line Items]            
Name of Creditor Mirae asset daewoo and others          
Borrowings interest rate 1.72~2.20          
Borrowings, maturity 2020.01.10 ~2020.02.05          
Short-term borrowings ₩ 400,000