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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
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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

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