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Revenue - Contract - Summary of In-Progress Contracts (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Accumulated cost | ₩ 15,689,709 | ₩ 28,057,329
Accumulated contract profit | 1,165,262 | 1,935,732
Accumulated contract loss | (729,880) | (709,097)
Accumulated contract revenue | ₩ 16,125,091 | ₩ 29,283,964

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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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Accumulated contract loss. + References No definition available. + Details
Name: | pkx_AccumulatedContractLoss
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accumulated contract profit. + References No definition available. + Details
Name: | pkx_AccumulatedContractProfit
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accumulated contract revenue. + References No definition available. + Details
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Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accumulated cost. + References No definition available. + Details
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Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration