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Employee Benefits - Expense Related to Post-employment Benefit Plans under Defined Contribution Plans (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of defined benefit plans [abstract]
Expense related to post-employment benefit plans under defined contribution plans	₩ 79,817	₩ 81,811	₩ 70,394

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- References

No definition available.

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2025-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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