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Financial risk management - Credit risk exposures per credit quality of derivative assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of Credit quality of derivative assets [Line Items]
Derivative assets	₩ 7,153,950	₩ 10,279,257
Grade 1
Disclosure of Credit quality of derivative assets [Line Items]
Derivative assets	6,797,321	9,578,458
Grade 2
Disclosure of Credit quality of derivative assets [Line Items]
Derivative assets	₩ 356,629	₩ 700,799

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ 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

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X

- 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.

+ Details

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- Details

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- Details

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Namespace Prefix:
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