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Income Taxes - Reconciliation Of Calculated Income Tax Expense Based on the Statutory Rate to Actual Amount of Taxes Recorded (Parenthetical) (Detail) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 KRW (₩)
Disclosure of Income Taxes [Line Items] |
Loss eligible to be carried forward upon disposal of joint venture | ₩ 122,922

X
- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
Name: | pkx_DisclosureOfIncomeTaxesLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loss eligible to be carried forward upon disposal of joint venture. + References No definition available. + Details
Name: | pkx_LossEligibleToBeCarriedForwardUponDisposalOfJointVenture
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration