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Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2017
₱ in Thousands, € in Thousands, ₨ in Thousands, ₨ in Thousands, ر.س in Thousands, ¥ in Thousands, R in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
JPY (¥)
USD ($)
SAR (ر.س)
EUR (€)
INR (₨)
PHP (₱)
ZAR (R)
NPR (₨)
CAD ($)
Commitments on bank-overdraft [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Nonghyup Bank and others                  
Limited amount | ₩ ₩ 1,555,000                  
Exercised amount | ₩ ₩ 68,859                  
Commitments on bank-daylight overdraft [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Nonghyup Bank                  
Limited amount | ₩ ₩ 280,000                  
Limit amount available for CP [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Shinhan Bank and others                  
Limited amount | ₩ ₩ 1,100,000                  
Limit amount available for card1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank and others                  
Limited amount | ₩ ₩ 46,733                  
Exercised amount | ₩ ₩ 2,775                  
Limit amount available for card2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Banco de Oro                  
Limited amount | ₱             ₱ 5,000      
Exercised amount | ₱             ₱ 5,000      
Loan limit1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Kookmin Bank and others                  
Limited amount | ₩ ₩ 895,500                  
Exercised amount | ₩ ₩ 425,411                  
Loan limit2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions BNP Paribas and others                  
Limited amount     $ 1,910,700              
Exercised amount     20,000              
Certification of payment on L/C [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Woori Bank and others                  
Limited amount     1,029,604              
Exercised amount     233,166              
Certification of performance guarantee on contract1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank                  
Limited amount       ر.س 102,186 € 1,958         $ 168
Exercised amount       ر.س 87,991 € 1,958         $ 168
Certification of performance guarantee on contract2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank and others                  
Limited amount | ₨           ₨ 230,515        
Exercised amount | ₨           230,515        
Certification of performance guarantee on contract3 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Korea Development Bank and others                  
Limited amount | ¥   ¥ 620,000                
Exercised amount | ¥   ¥ 620,000                
Certification of performance guarantee on contract4 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Seoul Guarantee Insurance and others                  
Limited amount | ₩ ₩ 104,248                  
Exercised amount | ₩ ₩ 104,248                  
Certification of performance guarantee on contract5 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Bank of Kathmandu                  
Limited amount | ₨                 ₨ 32,633  
Exercised amount | ₨                 ₨ 32,633  
Certification of performance guarantee on contract6 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Standard Chartered and others                  
Limited amount     753,652              
Exercised amount     696,806              
Certification of bidding1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions SMBC and others                  
Limited amount     60,000              
Exercised amount     10,230              
Certification of bidding2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions ABSA and others                  
Limited amount | R               R 55,730    
Exercised amount | R               R 55,730    
Advance payment bond, Warranty bond, Retention bond and others1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank                  
Limited amount | ₨           157,830        
Exercised amount | ₨           157,830        
Advance payment bond, Warranty bond, Retention bond and others2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Export-Import Bank of Korea and others                  
Limited amount     3,850,534              
Exercised amount     753,025              
Other commitments 1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Nonghyup Bank and others                  
Limited amount | ₩ ₩ 451,521                  
Exercised amount | ₩ ₩ 15,037                  
Other commitments 2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank and others                  
Limited amount     1,063,670              
Exercised amount     758,536              
Inclusive credit1 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Shinhan Bank                  
Limited amount | ₨           47,489        
Exercised amount | ₨           ₨ 47,489        
Inclusive credit2 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions KEB Hana Bank                  
Limited amount | ₩ ₩ 258,000                  
Exercised amount | ₩ ₩ 117,398                  
Inclusive credit3 [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions Shinhan Bank and others                  
Limited amount     32,125              
Exercised amount     16,155              
Trade finance [Member]                    
Commitments and Contingencies Disclosure [Line Items]                    
Financial institutions BNP Paribas and others                  
Limited amount     $ 800,000