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Financial risk management - Credit risk exposures per credit grade of off-balance items (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of internal credit grades [line items]    
Credit risk exposures ₩ 246,539,021 ₩ 241,489,989
Grade 1    
Disclosure of internal credit grades [line items]    
Credit risk exposures 216,315,725 213,873,159
Grade 2    
Disclosure of internal credit grades [line items]    
Credit risk exposures 30,106,405 27,590,175
Financial instruments credit-impaired    
Disclosure of internal credit grades [line items]    
Credit risk exposures 116,891 26,655
Guarantee contracts    
Disclosure of internal credit grades [line items]    
Credit risk exposures 26,221,968 22,509,195
Guarantee contracts | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 25,091,117 21,999,238
Guarantee contracts | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 1,119,073 488,593
Guarantee contracts | Impaired [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposures 11,778 21,364
Guarantee contracts | Grade 1    
Disclosure of internal credit grades [line items]    
Credit risk exposures 21,520,346 19,573,874
Guarantee contracts | Grade 1 | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 20,555,651 19,212,434
Guarantee contracts | Grade 1 | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 964,695 361,440
Guarantee contracts | Grade 2    
Disclosure of internal credit grades [line items]    
Credit risk exposures 4,689,844 2,913,957
Guarantee contracts | Grade 2 | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 4,535,466 2,786,804
Guarantee contracts | Grade 2 | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 154,378 127,153
Guarantee contracts | Financial instruments credit-impaired    
Disclosure of internal credit grades [line items]    
Credit risk exposures 11,778 21,364
Guarantee contracts | Financial instruments credit-impaired | Impaired [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposures 11,778 21,364
Loan commitment and other credit line    
Disclosure of internal credit grades [line items]    
Credit risk exposures 220,317,053 218,980,794
Loan commitment and other credit line | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 208,673,535 205,616,647
Loan commitment and other credit line | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 11,538,405 13,358,856
Loan commitment and other credit line | Impaired [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposures 105,113 5,291
Loan commitment and other credit line | Grade 1    
Disclosure of internal credit grades [line items]    
Credit risk exposures 194,795,379 194,299,285
Loan commitment and other credit line | Grade 1 | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 185,899,148 183,928,715
Loan commitment and other credit line | Grade 1 | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 8,896,231 10,370,570
Loan commitment and other credit line | Grade 2    
Disclosure of internal credit grades [line items]    
Credit risk exposures 25,416,561 24,676,218
Loan commitment and other credit line | Grade 2 | 12-month expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 22,774,387 21,687,932
Loan commitment and other credit line | Grade 2 | Lifetime expected credit losses    
Disclosure of internal credit grades [line items]    
Credit risk exposures 2,642,174 2,988,286
Loan commitment and other credit line | Financial instruments credit-impaired    
Disclosure of internal credit grades [line items]    
Credit risk exposures 105,113 5,291
Loan commitment and other credit line | Financial instruments credit-impaired | Impaired [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposures ₩ 105,113 ₩ 5,291