XML 122 R112.htm IDEA: XBRL DOCUMENT v3.26.1

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

X

- Definition

Allowance for inventories valuation.

+ References

No definition available.

+ Details

Name:	pkx_AllowanceForInventoriesValuation
Namespace Prefix:	pkx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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