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Assets Held for Sale - Details of Assets Held For Sale and Related Liabilities (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2025 KRW (₩)
Assets and liabilities held for sale [Line Items]
Disposal of equity securities classified as assets held for sale	₩ 467,796
Loss on Disposal of Equity Securities Classified as Assets Held for Sale	₩ 9,883

X

- Definition

Assets and liabilities held for sale.

+ References

No definition available.

+ Details

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X

- Definition

Disposal of equity securities classified as assets held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	pkx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Loss on disposal of equity securities classified as assets held for sale.

+ References

No definition available.

+ Details

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