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Borrowings transactions between related parties (Details) - Korea Development Bank [Member]
₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Facility [Member]  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance ₩ 207,993
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 27,324
Repayment (141,434)
Ending balance 93,883
Others [Member]  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 5,663
Changes in Borrowings transactions between related parties [Abstract]  
Repayment (754)
Ending balance 4,909
Operating funds [Member]  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 37,000
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 49,000
Repayment (25,000)
Ending balance 61,000
Syndicated Loan [Member]  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 6,075
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 11,855
Others (1,629)
Ending balance ₩ 16,301