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Maturity analysis for derivative financial assets and liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows ₩ (366,732) ₩ (178,556)
Derivative assets 172,910 321,116
Net settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 0 (3,017)
Derivative assets 0 0
Gross settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (158,688) (58,725)
Derivative assets 117,261 172,653
Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (208,044) (116,814)
Derivative assets 55,649 145,829
Gross settlement | Not Designated as Hedging Instrument Others    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative assets 0 2,634
Less than 1 year    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (50,635) (77,874)
Derivative assets 29,523 27,618
Less than 1 year | Net settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows 0 (3,017)
Derivative assets 0 0
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (12,777) (15,011)
Derivative assets 18,332 21
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 (37,858) (59,846)
Derivative assets 11,191 27,597
1~2 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (62,355) (29,761)
Derivative assets 1,529 91,153
1~2 Years | Gross settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (22,827) (8,295)
Derivative assets 1,529 43,931
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 (39,528) (21,466)
Derivative assets 0 47,222
2~5 Years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (194,154) (41,568)
Derivative assets 86,443 143,396
2~5 Years | Gross settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (118,704) (39,654)
Derivative assets 45,237 72,386
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 (75,450) (1,914)
Derivative assets 41,206 71,010
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (59,588) (29,353)
Derivative assets 55,415 58,949
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Trading    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative financial liabilities, undiscounted cash flows (4,380) 4,235
Derivative assets 52,163 56,315
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 (55,208) (33,588)
Derivative assets 3,252 0
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Others    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Derivative assets ₩ 0 ₩ 2,634