Assets Pledged as Collateral and Assets Held as Collateral - Summary of assets pledged as collateral (Parenthetical) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets pledged as collateral [Line Items]
Assets pledged as collateral	₩ 156,351	₩ 586,768
Pledged Assets Right to Sell or Pledge
Assets pledged as collateral [Line Items]
Assets pledged as collateral	₩ 13,374,326	₩ 13,579,738

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 51
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant