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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
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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

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- Definition The amount that best represents the entity's maximum exposure to loss from its interests in structured entities. [Refer: Total for all unconsolidated structured entities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 29 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_29_c&doctype=Standard -URIDate 2025-03-27 + Details
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