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Risk Management - Summary of Maturity Analysis for Derivative Financial Assets and Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows ₩ (76,319) ₩ (366,732)
Derivative financial assets 661,447 172,910
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 0
Derivative financial 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 (47,508) (158,688)
Derivative financial assets 456,690 117,261
Gross settlement | Designated as Hedging Instrument    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (28,811) (208,044)
Derivative financial assets 204,757 55,649
Less than 1 year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (9,183) (50,635)
Derivative financial assets 127,118 29,523
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 0
Derivative financial 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 (6,628) (12,777)
Derivative financial assets 93,554 18,332
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 (2,555) (37,858)
Derivative financial assets 33,564 11,191
1~2 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (5,592) (62,355)
Derivative financial assets 119,815 1,529
1~2 Years | 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 0
Derivative financial assets 0 0
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 (4,954) (22,827)
Derivative financial assets 54,617 1,529
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 (638) (39,528)
Derivative financial assets 65,198 0
2~5 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (35,549) (194,154)
Derivative financial assets 305,423 86,443
2~5 Years | 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 0
Derivative financial assets 0 0
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 (33,635) (118,704)
Derivative financial assets 202,663 45,237
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) (75,450)
Derivative financial assets 102,760 41,206
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities, undiscounted cash flows (25,995) (59,588)
Derivative financial assets 109,091 55,415
More than 5 years | 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 0
Derivative financial assets 0 0
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 (2,291) (4,380)
Derivative financial assets 105,856 52,163
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 (23,704) (55,208)
Derivative financial assets ₩ 3,235 ₩ 3,252