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Maturity analysis for derivative financial liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ (376,587) ₩ (148,273)
Net settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (774)  
Gross settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (92,947) (29,924)
Gross settlement [Member] | Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (282,866) (118,349)
Less than 1 year [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (69,817) (5,726)
Less than 1 year [Member] | Net settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (774)  
Less than 1 year [Member] | Gross settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (51,496) (3,081)
Less than 1 year [Member] | Gross settlement [Member] | Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (17,547) (2,645)
1~2 Years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (48,864) (26,689)
1~2 Years [Member] | Gross settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (19,887) (24,044)
1~2 Years [Member] | Gross settlement [Member] | Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (28,977) (2,645)
2~5 Years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (208,802) (56,484)
2~5 Years [Member] | Gross settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (16,597)  
2~5 Years [Member] | Gross settlement [Member] | Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (192,205) (56,484)
More than 5 years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (49,104) (59,374)
More than 5 years [Member] | Gross settlement [Member] | Not Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (4,967) (2,799)
More than 5 years [Member] | Gross settlement [Member] | Designated as Hedging Instrument [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ (44,137) ₩ (56,575)