XML 241 R231.htm IDEA: XBRL DOCUMENT v3.26.1

Commitments and Contingencies - Summary of SOC Projects (Detail) ₩ in Millions	Dec. 31, 2025 KRW (₩)
Disclosure of contingent liabilities [line items]
Approved amount	₩ 2,486,755
Remaining balance after repayment	1,395,830
SOC Projects [member]
Disclosure of contingent liabilities [line items]
Approved amount	3,472,663
Remaining balance after repayment	2,057,062
Associates and joint ventures [member] | SOC Projects [member]
Disclosure of contingent liabilities [line items]
Approved amount	537,617
Remaining balance after repayment	397,661
Associates and joint ventures [member] | SOC Projects [member] | POSCO DX Co., Ltd. [member] | Pocheon-Hwado Highway Corp. [member]
Disclosure of contingent liabilities [line items]
Approved amount	24,923
Remaining balance after repayment	22,234
Associates and joint ventures [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Pocheon-Hwado Highway Corp. [member]
Disclosure of contingent liabilities [line items]
Approved amount	319,515
Remaining balance after repayment	285,039
Associates and joint ventures [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Pohang E&E Co,. Ltd. [member]
Disclosure of contingent liabilities [line items]
Approved amount	71,930
Remaining balance after repayment	39,266
Associates and joint ventures [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Pureun Tongyeong Enviro Co., Ltd. [member]
Disclosure of contingent liabilities [line items]
Approved amount	25,630
Remaining balance after repayment	9,804
Associates and joint ventures [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Pure Gimpo Co., Ltd. [member]
Disclosure of contingent liabilities [line items]
Approved amount	51,565
Remaining balance after repayment	21,181
Associates and joint ventures [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Clean Iksan Co., Ltd. [member]
Disclosure of contingent liabilities [line items]
Approved amount	44,054
Remaining balance after repayment	20,137
Others [member]
Disclosure of contingent liabilities [line items]
Approved amount	1,947,125
Remaining balance after repayment	1,036,505
Others [member] | SOC Projects [member]
Disclosure of contingent liabilities [line items]
Approved amount	2,935,046
Remaining balance after repayment	1,659,401
Others [member] | SOC Projects [member] | POSCO DX Co., Ltd. [member] | Western Inland highway CO.,LTD. [member]
Disclosure of contingent liabilities [line items]
Approved amount	47,348
Remaining balance after repayment	32,668
Others [member] | SOC Projects [member] | POSCO DX Co., Ltd. [member] | Busan Sanseong Tunnel [member]
Disclosure of contingent liabilities [line items]
Approved amount	7,621
Remaining balance after repayment	7,621
Others [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Western Seoul highway CO.,LTD. and others [member]
Disclosure of contingent liabilities [line items]
Approved amount	63,683
Remaining balance after repayment	28,201
Others [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Western Inland highway CO.,LTD. and others [member]
Disclosure of contingent liabilities [line items]
Approved amount	2,778,848
Remaining balance after repayment	1,562,721
Others [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Pohang Youngil Bay New Port [member]
Disclosure of contingent liabilities [line items]
Approved amount	2,250
Remaining balance after repayment	1,440
Others [member] | SOC Projects [member] | POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Busan Sanseong Tunnel [member]
Disclosure of contingent liabilities [line items]
Approved amount	35,296
Remaining balance after repayment	₩ 26,750

X

- 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

Name:	ifrs-full_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Approved loan amount.

+ References

No definition available.

+ Details

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

X

- Definition

Balance of loan outstanding.

+ References

No definition available.

+ Details

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

X

- Details

Name:	pkx_TypesOfProjectAxis=pkx_SOCProjectsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=pkx_AssociatesAndJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuarantorsAxis=pkx_POSCODXCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PocheonhwadoHighwayCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuarantorsAxis=pkx_POSCOEcoAndChallengeCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PohangEAndECoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PureunTongyeongEnviroCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PureGimpoCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_CleanIksanCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_WesternInlandHighwayCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_BusanSanseongTunnelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_WesternSeoulHighwayCo.ltd.AndOthersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_WesternInlandHighwayCo.ltd.AndOthersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PohangYoungilBayNewPortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: