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Inventories - Additional Information (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of inventories [Line Items] |  |  |
Allowance for inventories valuation | ₩ 25,482 | ₩ 77,832 | ₩ 52,348

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- Definition Allowance for inventories valuation. + References No definition available. + Details
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Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of inventories. + References No definition available. + Details
Name: | pkx_DisclosureOfInventoriesLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration