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Interests in unconsolidated structured entities - Summary of carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets ₩ 52,600,920 ₩ 50,395,946
Carrying amounts of the liabilities 8,897 8,158
Derivative liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 2,101 3,350
Other liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 6,796 4,808
Loans at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 750,660 612,465
Loans at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 22,532,620 21,079,692
Securities at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 21,242,866 19,391,428
Derivative assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 9,286 16,012
Securities at FVOCI    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 3,859,649 4,301,015
Securities at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 4,089,677 4,879,577
Other assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 116,162 115,757
Asset-backed securitization    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 15,300,459 15,604,968
Carrying amounts of the liabilities 2,416 3,640
Asset-backed securitization | Derivative liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 2,101 3,130
Asset-backed securitization | Other liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 315 510
Asset-backed securitization | Loans at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 4,622 11,669
Asset-backed securitization | Loans at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 2,971,101 2,326,196
Asset-backed securitization | Securities at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 4,491,692 4,233,165
Asset-backed securitization | Derivative assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 9,286 16,012
Asset-backed securitization | Securities at FVOCI    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 3,721,496 4,124,742
Asset-backed securitization | Securities at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 4,089,597 4,879,484
Asset-backed securitization | Other assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 12,665 13,700
Structured financing    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 20,718,392 19,767,186
Carrying amounts of the liabilities 6,481 4,515
Structured financing | Derivative liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 0 220
Structured financing | Other liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 6,481 4,295
Structured financing | Loans at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 746,038 600,796
Structured financing | Loans at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 19,410,662 18,660,200
Structured financing | Securities at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 322,481 255,936
Structured financing | Derivative assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 0 0
Structured financing | Securities at FVOCI    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 138,153 176,273
Structured financing | Securities at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 0 0
Structured financing | Other assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 101,058 73,981
Investment funds    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 16,582,069 15,023,792
Carrying amounts of the liabilities 0 3
Investment funds | Derivative liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 0 0
Investment funds | Other liabilities    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the liabilities 0 3
Investment funds | Loans at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 0 0
Investment funds | Loans at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 150,857 93,296
Investment funds | Securities at FVTPL    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 16,428,693 14,902,327
Investment funds | Derivative assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 0 0
Investment funds | Securities at FVOCI    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 0 0
Investment funds | Securities at amortized cost    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets 80 93
Investment funds | Other assets    
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]    
Carrying amounts of the assets ₩ 2,439 ₩ 28,076