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Derivatives - Effect of derivatives on statement financial position, statement of comprehensive income, statement of changes in equity (Details)
₩ in Millions, Unit_pure in Millions
12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2023
KRW (₩)
Fair value hedges | Interest rate forward and swap      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 10,339,461 10,347,033 10,112,789
Carrying value of assets [1] ₩ 45,898 ₩ 57,685 ₩ 65,787
Carrying value of liabilities [1] 431,007 579,563 614,219
Changes in fair value in the period ₩ 138,277 ₩ 42,787 ₩ 246,594
Fair value hedges | Currency forward      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 434,282 429,939 308,117
Carrying value of assets [1] ₩ 1,079 ₩ 0 ₩ 2,949
Carrying value of liabilities [1] 14,708 39,395 791
Changes in fair value in the period ₩ 14,686 ₩ (46,382) ₩ (327)
Fair value hedges | Equity options      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 0 18,750  
Carrying value of assets [1] ₩ 0    
Carrying value of liabilities [1] 0 ₩ 3,941  
Changes in fair value in the period ₩ 3,941 ₩ 1,109  
Cash flow hedges | Currency swap      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 9,059,478 7,993,851 4,448,030
Carrying value of assets [1] ₩ 521,120 ₩ 539,015 ₩ 111,024
Carrying value of liabilities [1] 344,888 181,413 99,093
Changes in fair value in the period ₩ (218,169) ₩ 314,114 ₩ (21,649)
Cash flow hedges | Interest rate forward and swap      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 3,273,296 2,872,383 2,356,791
Carrying value of assets [1] ₩ 31,076 ₩ 93,562 ₩ 53,830
Carrying value of liabilities [1] 196,244 44,139 90,676
Changes in fair value in the period ₩ (214,598) ₩ 60,694 ₩ 99,442
Cash flow hedges | Currency forward      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 1,898,541 1,723,440 1,150,734
Carrying value of assets [1] ₩ 1,104 ₩ 2,087 ₩ 12,593
Carrying value of liabilities [1] 161,596 138,694 30,925
Changes in fair value in the period ₩ 34,038 ₩ (104,727) ₩ 2,170
Hedge of Net Investment | Currency forward      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 1,380,935 2,191,770 683,382
Carrying value of assets [1] ₩ 16,814 ₩ 10,013 ₩ 6,038
Carrying value of liabilities [1] 0 34,926 2,776
Changes in fair value in the period ₩ 51,154 ₩ (41,071) ₩ 4,537
Hedge of Net Investment | Borrowings      
Disclosure of detailed information about hedging instruments [line items]      
Notional values 1,895,100 1,852,212 1,466,795
Carrying value of assets [1] ₩ 0 ₩ 0 ₩ 0
Carrying value of liabilities [1] 1,891,783 1,848,316 1,462,329
Changes in fair value in the period ₩ 29,364 ₩ (181,341) ₩ (4,767)
[1] The related account categories are presented as interest rate swap assets / liabilities and currency forward assets / liabilities etc.