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Interests in unconsolidated structured entities - Summary of size of unconsolidated structured entities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Size of unconsolidated structured entities [Line Items] |  |
Total assets | ₩ 1,351,527,415 | ₩ 1,208,748,985
Asset-backed securitization |  |
Size of unconsolidated structured entities [Line Items] |  |
Total assets | 180,681,470 | 193,570,970
Structured financing |  |
Size of unconsolidated structured entities [Line Items] |  |
Total assets | 567,491,062 | 506,473,200
Investment funds |  |
Size of unconsolidated structured entities [Line Items] |  |
Total assets | ₩ 603,354,883 | ₩ 508,704,815

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