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Maturity analysis for derivative financial liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ 83,336 ₩ (376,587)
Net settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 0 (774)
Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 90,706 (92,947)
Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (7,370) (282,866)
Less than 1 year    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 10,888 (69,817)
Less than 1 year | Net settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 0 (774)
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 5,734 (51,496)
Less than 1 year | Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 5,154 (17,547)
1~2 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (26,882) (48,864)
1~2 Years | Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 16,565 (19,887)
1~2 Years | Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (43,447) (28,977)
2~5 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 100,123 (208,802)
2~5 Years | Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 28,283 (16,597)
2~5 Years | Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 71,840 (192,205)
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (793) (49,104)
More than 5 years | Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 40,124 (4,967)
More than 5 years | Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ (40,917) ₩ (44,137)