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Reporting entity - Ownership of Shinhan Financial Group and its material consolidated subsidiaries (Parenthetical) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Subsidiary Jeju Bank [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 64.00% | 75.30%
Subsidiary Jeju Bank [Member] | Top of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 75.30% |
Subsidiary Jeju Bank [Member] | Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 64.00% |
Subsidiary Shinhan EZ General Insurance Co Ltd [Member] |  |
Disclosure of subsidiaries [line items] |  |
Paid in capital increase | ₩ 100,000 |
Proportion of ownership interest in subsidiary | 91.70% | 85.10%
Subsidiary Shinhan EZ General Insurance Co Ltd [Member] | Top of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 91.70% |
Subsidiary Shinhan EZ General Insurance Co Ltd [Member] | Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 85.10% |
SBJDNX and Shinhan Bank Japan [Member] | Top of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 100.00% |
SBJDNX and Shinhan Bank Japan [Member] | Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 90.00% |
LLP MFO Shinhan Finance [Member] | Top of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 75.00% |
LLP MFO Shinhan Finance [Member] | Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in subsidiary | 72.10% |

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2025-03-27 + Details
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