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Income Taxes - Summary of Current Income Tax Liabilities (Detail) ₩ in Millions | Dec. 31, 2025 KRW (₩)
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Deferred tax assets and liabilities [abstract] |
Current income tax liabilities | ₩ 72,405

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- References No definition available. + Details
Name: | ifrs-full_DeferredTaxAssetsAndLiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tax liabilities current. + References No definition available. + Details
Name: | pkx_TaxLiabilitiesCurrent
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant