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Revenue - Contract - Summary of Due From Customers for Contract Work and Due to Customers for Contract Work (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Due from customers for contract work | ₩ 1,580,558 | ₩ 1,487,559
Due to customers for contract work | (727,902) | (452,839)
Construction contract in progress | ₩ 852,656 | ₩ 1,034,720

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Due to customers for contract work. + References No definition available. + Details
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Balance Type: | debit
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- Definition Gross amount due from customers for contract work as assets. + References No definition available. + Details
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Namespace Prefix: | pkx_
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- Definition Gross amount due from to customers for contract work. + References No definition available. + Details
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Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant