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Commitments and contingencies (Details) ₩ in Millions, $ in Millions |  | 5 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 22, 2021 KRW (₩) | Sep. 30, 2017 USD ($) | Dec. 31, 2025 KRW (₩) | Dec. 31, 2024 KRW (₩) | Sep. 28, 2021
litigations [Line Items] |  |  |  |  |
Covered Bonds Issued Carrying Amount |  |  | ₩ 1,916,820 | ₩ 1,852,365 |
Cover Pools Carrying Amount |  |  | 3,647,109 | ₩ 4,458,312 |
Shinhan Asset Trust Co., Ltd. [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Project Financing Loan Commitment Unused Limit |  |  | 263,836 |  |
16 project sites [Member] | Shinhan Asset Trust Co., Ltd. [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Project Financing Commitment Amount |  |  | 1,059,277 |  |
Project Financing Outstanding Loan Balance |  |  | 993,054 |  |
8 project sites [Member] | Shinhan Asset Trust Co., Ltd. [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Project Financing Commitment Amount |  |  | 249,927 |  |
Project Financing Outstanding Loan Balance |  |  | 224,123 |  |
Events After Reporting Period [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Loss Contingency Penalty Amount | ₩ 50 |  |  |  |
Board Of Directors [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Percentage of investment principal repaid to the Customer |  |  |  |  | 40.00%
Gen2 Related Trust Instruments |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Securities sold under agreements to repurchase |  |  | 420,000 |  |
Lime Asset Management | Total Return Swap Agreement |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Purchase of investments other than investments accounted for using equity method | $ |  | $ 200 |  |  |
Miscellaneous other provisions |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Provisions and insurance contract liabilities |  |  | 144,173 |  |
insurance contract Liabilities |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Provisions and insurance contract liabilities |  |  | ₩ 5,732 |  |

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- Definition The cash outflow for the purchase of investments other than investments accounted for using equity method. [Refer: Investments accounted for using equity method; Investments other than investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_16&doctype=Standard -URIDate 2025-03-27 + Details
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