Post-Employment Benefits - Details of Principal Actuarial Assumptions (Parenthetical) (Details) ₩ in Millions	12 Months Ended
Dec. 31, 2025 KRW (₩)
Disclosure of sensitivity analysis for actuarial assumptions [abstract]
Change in accounting estimate, defined benefit obligation decreased	₩ 83,842
Change in accounting estimate defined benefit obligation retained earnings increased	₩ 76,545

The estimate of the amounts expected to be paid from defined benefit plan in future. [Refer: Defined benefit plans [domain]; Maturity [axis]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 147
-Subparagraph c
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-URIDate 2025-03-27

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Period Type:	duration