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Borrowings and Debt Securities : Short-term borrowings (Details)
₱ in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2020
KRW (₩)
Dec. 31, 2019
KRW (₩)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
PHP (₱)
Disclosure of detailed information about Short-term borrowings [Line Items]          
Short-term borrowings ₩ 1,436,922 ₩ 1,098,555      
Local short-term borrowings          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor DB financial investment and others DB financial investment and others      
Borrowings interest rate 0.80 ~ 4.60 2.00 ~ 2.20      
Borrowings, maturity 2021.01.05 ~2021.12.31 2020.01.13 ~2020.02.05      
Short-term borrowings ₩ 580,004 ₩ 280,000      
Foreign short-term borrowings          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor Shinhan Bank LG-CNS      
Borrowings interest rate 0.71 ~ 0.74 4.60      
Borrowings, maturity 2021.01.04 ~2021.03.31 2020.06.30      
Short-term borrowings ₩ 60,268 ₩ 27,439 $ 55,393 $ 23,699  
Foreign short-term borrowings          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor Korea Development Bank and others BDO Unibank      
Borrowings interest rate 1M Libor + 1.25 3M BVAL + 0.50      
Borrowings, maturity 2022.04.29 [1] 2020.12.20      
Short-term borrowings ₩ 81,290 ₩ 5,130 $ 73,704   ₱ 225,000
Foreign short-term borrowings          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor   Mizuho Bank      
Borrowings interest rate   4.60      
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 Woori Bank Korea development Bank and others      
Borrowings interest rate Standard overdraft rate + 1.26 1.98 ~ 2.75      
Borrowings, maturity 2021.02.26 2020.01.01 ~2020.04.16      
Short-term borrowings ₩ 29,960 ₩ 373,219      
Local bank overdraft          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor Korea Development Bank and others        
Borrowings interest rate 1.42 ~ 1.88        
Borrowings, maturity 2021.01.07 ~ 2021.04.26        
Short-term borrowings ₩ 215,400        
Electronic short-term bonds          
Disclosure of detailed information about Short-term borrowings [Line Items]          
Name of Creditor KB Securities and others Mirae asset daewoo and others      
Borrowings interest rate 0.75 ~ 1.35 1.72 ~ 2.20      
Borrowings, maturity 2021.01.13 ~2021.03.18 2020.01.10 ~2020.02.05      
Short-term borrowings ₩ 470,000 ₩ 400,000      
[1] The contractual maturity is 2022 but is classified as short-term borrowing due to intention of early redemption in 3 months after borrowing.