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Financial risk management - Summary of transfers that do not qualify for derecognition (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Securities at FVTPL
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	₩ 7,687,437	₩ 10,141,306
Bonds sold under repurchase agreements
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	12,401,078	11,007,055
Associated financial liabilities	14,988,698	11,542,956
Financial assets at FVOCI
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	4,615,372	645,888
Securities at amortized cost
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	87,569	199,261
Loans at amortized cost
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	10,700	20,600
Securities loaned
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	15,961,633	14,699,783
Government bonds
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	14,992,877	13,611,571
Financial institutions bonds
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	408,766	607,175
Corporation bonds
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	519,713	465,211
Equity securities
Transfers that do not qualify for derecognition [Line Items]
Transferred financial assets	₩ 40,277	₩ 15,826

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The fair value of financial liabilities associated with transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 42D
-Subparagraph d
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- Definition

The fair value of transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets]

+ References

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-Number 7
-IssueDate 2025-01-01
-Paragraph 42D
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