Leases - Summary of Cash Outflows From Lease (Details) - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Disclosure of quantitative information about leases for lessee [abstract]
Cash outflows from lease	₩ 254,626	₩ 240,491

The cash outflow for leases.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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
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