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Interests in unconsolidated structured entities - Summary of exposure to risk relating to its interests in unconsolidated structured entities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk ₩ 58,968,228 ₩ 55,780,149
Assets held    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 52,600,920 50,395,946
ABS and ABCP purchase agreement    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 4,283,857 3,595,823
Loan commitments    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 1,782,165 1,285,259
Guarantees    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 37,450 120,050
Others    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 263,836 383,071
Asset-backed securitization    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 17,390,188 17,168,885
Asset-backed securitization | Assets held    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 15,300,459 15,604,968
Asset-backed securitization | ABS and ABCP purchase agreement    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 1,802,241 1,125,400
Asset-backed securitization | Loan commitments    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 256,038 327,367
Asset-backed securitization | Guarantees    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 31,450 111,150
Asset-backed securitization | Others    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 0 0
Structured financing    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 22,724,465 21,299,577
Structured financing | Assets held    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 20,718,392 19,767,186
Structured financing | ABS and ABCP purchase agreement    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 277,917 224,184
Structured financing | Loan commitments    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 1,458,320 916,236
Structured financing | Guarantees    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 6,000 8,900
Structured financing | Others    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 263,836 383,071
Investment fund    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 18,853,575 17,311,687
Investment fund | Assets held    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 16,582,069 15,023,792
Investment fund | ABS and ABCP purchase agreement    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 2,203,699 2,246,239
Investment fund | Loan commitments    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 67,807 41,656
Investment fund | Guarantees    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk 0 0
Investment fund | Others    
Exposure to risk relating to its interests in unconsolidated structured entities [Line Items]    
Exposure to risk ₩ 0 ₩ 0