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Related parties - Collaterals provided by the related parties (Details) - Shinhan Bank Co., Ltd. [Member] - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | ₩ 1,515,627 | ₩ 1,026,797
Logisvalley Shinhan REIT Co., Ltd. | Collateral trust [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 39,600 | 39,600
Nomura-Rifa Private Real Estate Investment Trust 31 | Collateral trust [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 16,632 | 16,800
SBC PFV Co., Ltd [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 1,447,529 | 960,000
SBC PFV Co., Ltd [Member] | Collateral trust [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 1,440,000 | 960,000
SBC PFV Co., Ltd [Member] | Shares [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 7,529 | 0
Key Management Personnel [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 11,866 | 10,397
Key Management Personnel [Member] | Properties [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 9,103 | 6,799
Key Management Personnel [Member] | Deposits and etc [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | 1,783 | 1,466
Key Management Personnel [Member] | Guarantee [Member] |  |
Related parties - Collaterals provided by the related parties [Line Items] |  |
Amount of collaterals | ₩ 980 | ₩ 2,132

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