XML 179 R169.htm IDEA: XBRL DOCUMENT
v3.26.1

Financial Instruments - Finance Income and Costs by Category of Financial Instruments (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items] |  |  |
Interest income (expense) | ₩ (558,155) | ₩ (474,729) | ₩ (499,143)
Gain and loss on valuation | 21,328 | 1,149,625 | 338,996
Gain and loss on foreign currency | 742 | (741,225) | (348,002)
Gain and loss on disposal | (159,036) | 167,107 | 118,716
Others | 6,976 | 30,082 | 17,183
Total | (688,145) | 130,860 | (372,250)
Other comprehensive income (loss) | 319,626 | (150,553) | 256,433
Financial liabilities at fair value through profit or loss |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain and loss on valuation | (1,310) | 239,120 | (305,562)
Gain and loss on foreign currency | (4,145) | (57,625) | (92,835)
Gain and loss on disposal |  | (6,257) |
Total | (5,455) | 175,238 | (398,397)
Derivative liabilities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain and loss on valuation | 12,049 | (31,018) | (44,323)
Gain and loss on disposal | (358,953) | (279,594) | (276,600)
Total | (346,904) | (310,612) | (320,923)
Other comprehensive income (loss) | 8 | (110) | (1,292)
Financial liabilities measured at amortized cost [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Interest income (expense) | (1,091,462) | (1,051,511) | (1,001,290)
Gain and loss on foreign currency | 38,876 | (1,781,845) | (466,244)
Gain and loss on disposal |  | (806) | 11
Others | (34,187) | (36,252) | (26,616)
Total | (1,086,773) | (2,870,414) | (1,494,139)
Financial assets at fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain and loss on valuation | (57,207) | 120,544 | 520,884
Gain and loss on disposal | 51,353 | 136,699 | 190,531
Others | 9,267 | 887 | 560
Total | 3,413 | 258,130 | 711,975
Derivative assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain and loss on valuation | 67,796 | 820,979 | 167,997
Gain and loss on disposal | 221,995 | 399,680 | 289,423
Total | 289,791 | 1,220,659 | 457,420
Financial assets at fair value through other comprehensive income [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Others | 28,789 | 76,060 | 49,586
Total | 28,789 | 76,060 | 49,586
Other comprehensive income (loss) | 319,618 | (150,443) | 257,725
Financial assets at financial assets measured at amortized cost [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Interest income (expense) | 533,307 | 576,782 | 502,147
Gain and loss on foreign currency | (33,989) | 1,098,245 | 211,077
Gain and loss on disposal | (73,431) | (82,615) | (84,649)
Others | 3,107 | (10,613) | (6,347)
Total | ₩ 428,994 | ₩ 1,581,799 | ₩ 622,228

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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_FinanceIncomeCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2025-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2025-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_InterestRevenueExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_OtherFinanceIncomeCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gains losses on disposal of financial assets and liabilities. + References No definition available. + Details
Name: | pkx_GainsLossesOnDisposalOfFinancialAssetsAndLiabilities
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gains (losses) on foreign currency transactions and translations. + References No definition available. + Details
Name: | pkx_GainsLossesOnForeignCurrencyTransactionsAndTranslations
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gains (losses) recognised in profit or loss, fair value measurement, assets and liabilities. + References No definition available. + Details
Name: | pkx_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssetsAndLiabilities
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other comprehensive income, net of tax, financial instruments. + References No definition available. + Details
Name: | pkx_OtherComprehensiveIncomeNetOfTaxFinancialInstruments
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=pkx_DerivativeFinancialLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=pkx_DerivativeFinancialAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |