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Provisions - Summary of provisions (Parenthetical) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of other provisions [line items]
Provisions	₩ 1,363,345	₩ 1,308,896
Maximum
Disclosure of other provisions [line items]
Provisions	305,237	317,857
Provision for vulnerable group
Disclosure of other provisions [line items]
New provisions, other provisions		25,856
Miscellaneous other provisions [member]
Disclosure of other provisions [line items]
Provisions	695,785	579,114	₩ 819,616
New provisions, other provisions	₩ 8,643	₩ 19,086

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.

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- Definition

The amount recognised for new other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

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