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Maturity analysis for derivative financial liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ (178,556) ₩ 83,336
Net settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (3,017) 0
Gross settlement | Not Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (58,725) 90,706
Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (116,814) (7,370)
Less than 1 year    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (77,874) 10,888
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 (3,017) 0
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 (15,011) 5,734
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 (59,846) 5,154
1~2 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (29,761) (26,882)
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 (8,295) 16,565
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 (21,466) (43,447)
2~5 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (41,568) 100,123
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 (39,654) 28,283
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 (1,914) 71,840
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (29,353) (793)
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 4,235 40,124
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 ₩ (33,588) ₩ (40,917)