XML 209 R199.htm IDEA: XBRL DOCUMENT
v3.26.1

Revenue - Contract - Summary of Expected Revenue In Relation To Performance Obligations (Detail) - Infrastructure - construction segment [Member] ₩ in Millions | Dec. 31, 2025 KRW (₩)
--- | ---
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items] |
Expected revenue | ₩ 17,820,943
2026 [member] |
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items] |
Expected revenue | 7,319,357
2027 [member] |
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items] |
Expected revenue | 5,242,014
2028 [member] |
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items] |
Expected revenue | 2,928,964
After 2029 [member] |
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items] |
Expected revenue | ₩ 2,330,608

X
- Definition Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Item] + References No definition available. + Details
Name: | pkx_DisclosureOfExpectedRevenueInRelationToPerformanceObligationsLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Performance Obligations. + References No definition available. + Details
Name: | pkx_ExpectedPerformanceObligations
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_SegmentsAxis=pkx_ConstructionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=pkx_LaterThanThreeYearAndOnwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |