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Derivatives - Gain or loss on valuation of derivatives (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | ₩ 245,952 | ₩ 324,563 | ₩ 619,499
Exchange traded |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 41,714 | (43,907) | (143,178)
Foreign Currency Related | Over the counter |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 252,056 | (429) | 173,957
Foreign Currency Related | Over the counter | Currency forward |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 273,413 | 1,734,704 | 36,890
Foreign Currency Related | Over the counter | Currency swap |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (28,745) | (1,739,525) | 135,712
Foreign Currency Related | Over the counter | Currency options |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 7,388 | 4,392 | 1,355
Foreign Currency Related | Exchange traded |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 248,798 | 375 | 173,002
Foreign Currency Related | Exchange traded | Currency futures |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (3,258) | 804 | (955)
Interest Rates Related | Over the counter |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 189,315 | 112,821 | 179,101
Interest Rates Related | Over the counter | Interest rate options |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 1,476 | (2,413) | (2,886)
Interest Rates Related | Over the counter | Interest rate forwards and swaps |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 187,839 | 115,234 | 181,987
Interest Rates Related | Exchange traded |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 189,467 | 115,074 | 169,590
Interest Rates Related | Exchange traded | Interest rate futures and others |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 152 | 2,253 | (9,511)
Credit Related | Over the counter |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 4,405 | 44,223 | 53,042
Credit Related | Over the counter | Credit Swaps |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (5,507) | 44,223 | 53,042
Credit Related | Over the counter | Total return swaps |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 9,912 |  |
Equity Related | Over the counter |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 36,815 | (32,899) | (179,258)
Equity Related | Over the counter | Equity Options |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 6,807 | 28,708 | (159,324)
Equity Related | Over the counter | Equity Swaps And Forwards |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 30,008 | (61,607) | (19,934)
Equity Related | Exchange traded | Equity Options |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (5,036) | 1,085 | (13,929)
Equity Related | Exchange traded | Equity Futures |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 9,935 | (12,093) | 50,009
Commodity Related | Over the counter |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 26,502 | (43,643) | 38,543
Commodity Related | Over the counter | Commodity swaps and forwards |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 26,502 | (43,643) | 37,027
Commodity Related | Over the counter | Commodity options |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 0 | 0 | 1,516
Commodity Related | Exchange traded |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | 26,140 | (33,581) | 40,027
Commodity Related | Exchange traded | Commodity futures |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (362) | 10,062 | 1,484
Hedge Funds |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | (264,572) | 242,379 | 327,016
Trading purpose | Equity related | Exchange traded |  |  |
Gain or loss on valuation of derivatives [Line Items] |  |  |
Gain or loss on valuation of derivatives | ₩ 4,899 | ₩ (11,008) | ₩ 36,080

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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