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Revenue - Contract - Summary of In-Progress Contracts (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	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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Namespace Prefix:	ifrs-full_
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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.

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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.

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No definition available.

+ Details

Name:	pkx_AccumulatedContractRevenue
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

Name:	pkx_AccumulatedCost
Namespace Prefix:	pkx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration