XML 124 R114.htm IDEA: XBRL DOCUMENT
v3.26.1

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
Name: | pkx_AssetsAndLiabilitiesHeldForSaleLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disposal of equity securities classified as assets held for sale. + References No definition available. + Details
Name: | pkx_DisposalOfEquitySecuritiesClassifiedAsAssetsHeldForSale
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
Name: | pkx_LossOnDisposalOfEquitySecuritiesClassifiedAsAssetsHeldForSale
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration