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Deposits - Summary of deposits (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Deposits [Line Items] |  |
Deposits | ₩ 447,648,971 | ₩ 422,781,045
Demand Deposits |  |
Deposits [Line Items] |  |
Deposits | 172,840,773 | 160,031,759
Time Deposits |  |
Deposits [Line Items] |  |
Deposits | 238,328,250 | 236,527,490
Certificates of deposits |  |
Deposits [Line Items] |  |
Deposits | 17,001,339 | 10,409,701
Discount note deposits |  |
Deposits [Line Items] |  |
Deposits | 8,921,064 | 7,624,787
CMA |  |
Deposits [Line Items] |  |
Deposits | 4,889,093 | 4,451,561
Others |  |
Deposits [Line Items] |  |
Deposits | 5,668,452 | 3,735,747
Domestic currency [Member] | Demand Deposits |  |
Deposits [Line Items] |  |
Deposits | 146,969,815 | 134,283,019
Domestic currency [Member] | Time Deposits |  |
Deposits [Line Items] |  |
Deposits | 202,475,134 | 202,699,097
Foreign currency [Member] | Demand Deposits |  |
Deposits [Line Items] |  |
Deposits | 25,870,958 | 25,748,740
Foreign currency [Member] | Time Deposits |  |
Deposits [Line Items] |  |
Deposits | ₩ 35,853,116 | ₩ 33,828,393

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- Definition The amount of deposit liabilities held by the entity. + 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 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_DepositLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | shg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |