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Commitments and Contingencies - Contingent Liabilities on Outstanding Guarantees (Detail) - Dec. 31, 2025 - Contingent liabilities on outstanding guarantees [member] € in Millions, ₩ in Millions, ฿ in Millions, ¥ in Millions, Rp in Millions, $ in Millions, $ in Millions, $ in Millions | USD ($) | KRW (₩) | EUR (€) | CNY (¥) | CAD ($) | AUD ($) | IDR (Rp) | THB (฿)
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POSCO HOLDINGS INC. [member] | POSCO Asia Co Ltd [member] | ING BANK and others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | $ 32,000,000 | ₩ 45,917 |  |  |  |  |  |
POSCO HOLDINGS INC. [member] | POSCO Argentina S.A.U [member] | HSBC and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 1,017,467,072 | 1,459,962 |  |  |  |  |  |
POSCO HOLDINGS INC. [member] | Nickel mining company SAS [member] | ING Bank [Member] | EUR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 77,543 | € 46,000,000 |  |  |  |  |
POSCO HOLDINGS INC. [member] | Pt Nicole Metal Industry [Member] | OCBC Bank and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 17,090,526 | 24,523 |  |  |  |  |  |
POSCO HOLDINGS INC. [member] | Top of range [member] | POSCO Asia Co Ltd [member] | ING BANK and others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 200,000,000 | 286,981 |  |  |  |  |  |
POSCO HOLDINGS INC. [member] | Top of range [member] | POSCO Argentina S.A.U [member] | HSBC and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 1,079,900,000 | 1,549,547 |  |  |  |  |  |
POSCO HOLDINGS INC. [member] | Top of range [member] | Nickel mining company SAS [member] | ING Bank [Member] | EUR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 77,543 | 46,000,000 |  |  |  |  |
POSCO HOLDINGS INC. [member] | Top of range [member] | Pt Nicole Metal Industry [Member] | OCBC Bank and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 40,180,000 | 57,654 |  |  |  |  |  |
POSCO [member] | POSCO ASSAN TST STEEL INDUSTRY Inc [member] | Citibank And Others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 122,850,000 | 176,277 |  |  |  |  |  |
POSCO [member] | POSUK Titanium LLP [Member] | Shinhan Bank [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 12,750,000 | 18,295 |  |  |  |  |  |
POSCO [member] | Top of range [member] | POSCO ASSAN TST STEEL INDUSTRY Inc [member] | Citibank And Others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 122,850,000 | 176,277 |  |  |  |  |  |
POSCO [member] | Top of range [member] | POSUK Titanium LLP [Member] | Shinhan Bank [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 12,750,000 | 18,295 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | POSCO ASSAN TST STEEL INDUSTRY Inc [member] | Woori Bank Hong Kong And Others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 13,650,000 | 19,586 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | PT Bio Inti Agrindo [member] | Hana Bank Indonesia and others [member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 631,200,000,000 | 54,031 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | POSCO INTERNATIONAL Deutschland GMBH [member] | Bank Mendes Gans Amsterdam [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 0 | 0 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | POSCO INTERNATIONAL JAPAN Corp. [member] | Bank Mendes Gans Amsterdam [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 15,987,721 | 22,941 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | PT. KRAKATAU POSCO ENERGY [member] | POSCO Asia Co., Ltd. And others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 29,400,000 | 42,186 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Posco International Mexico e-Mobility S.A DE C.V. [member] | Export-Import Bank of Korea and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 51,379,000 | 73,724 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | POSCO INTERNATIONAL POLAND EMOBILITY SP Z OO [Member] | BNP Paribas Polska SA [Member] | EUR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 39,914 | 23,678,000 |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | PT POSCO INTERNATIONAL ENP INDONESIA [member] | PT Bank Negara Indonesia [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 750,000 | 1,076 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | AGPA PTE LTD [Member] | SMBC Singapore [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 20,880,000 | 29,961 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | POSCO INTERNATIONAL ALASKA ENERGY LLC [Member] | Glenfarne Alaska Partners LLC [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 45,000,000 | 64,571 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | GLOBAL KOMSCO Daewoo LLC [member] | Hana Bank Bahrain [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 4,200,000 | 6,027 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | POSCO ASSAN TST STEEL INDUSTRY Inc [member] | Woori Bank Hong Kong And Others [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 13,650,000 | 19,586 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | PT Bio Inti Agrindo [member] | Hana Bank Indonesia and others [member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 631,200,000,000 | 54,031 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | POSCO INTERNATIONAL Deutschland GMBH [member] | Bank Mendes Gans Amsterdam [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 50,000,000 | 71,745 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | PT. KRAKATAU POSCO ENERGY [member] | POSCO Asia Co., Ltd. And others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 102,903,407 | 147,656 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | Posco International Mexico e-Mobility S.A DE C.V. [member] | Export-Import Bank of Korea and others [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 52,054,800 | 74,693 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | POSCO INTERNATIONAL POLAND EMOBILITY SP Z OO [Member] | BNP Paribas Polska SA [Member] | EUR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 39,914 | € 23,678,000 |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | PT POSCO INTERNATIONAL ENP INDONESIA [member] | PT Bank Negara Indonesia [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 750,000 | 1,076 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | AGPA PTE LTD [Member] | SMBC Singapore [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 20,880,000 | 29,961 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | POSCO INTERNATIONAL ALASKA ENERGY LLC [Member] | Glenfarne Alaska Partners LLC [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 45,000,000 | 64,571 |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] | Top of range [member] | GLOBAL KOMSCO Daewoo LLC [member] | Hana Bank Bahrain [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 6,650,000 | 9,542 |  |  |  |  |  |
POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Chun-cheon Energy Co., Ltd. [member] | Kookmin Bank and Others [member] | KRW [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 117,980 |  |  |  |  |  |
POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Subcontractors for maintenance projects, etc. [Member] | Kookmin Bank and Others [member] | KRW [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 65,338 |  |  |  |  |  |
POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Top of range [member] | Chun-cheon Energy Co., Ltd. [member] | Kookmin Bank and Others [member] | KRW [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 149,200 |  |  |  |  |  |
POSCO Eco & Challenge Co., Ltd. (formerly, POSCO ENGINEERING & CONSTRUCTION CO.,LTD.) [member] | Top of range [member] | Subcontractors for maintenance projects, etc. [Member] | Kookmin Bank and Others [member] | KRW [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 380,652 |  |  |  |  |  |
POSCO STEELEON Co., Ltd [member] | Myanmar POSCO C&C Company, Limited [member] | POSCO Asia Co Ltd [member] | China, Yuan Renminbi |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 20,762 |  | ¥ 101,398,422 |  |  |  |
POSCO STEELEON Co., Ltd [member] | Top of range [member] | Myanmar POSCO C&C Company, Limited [member] | POSCO Asia Co Ltd [member] | China, Yuan Renminbi |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 24,915 |  | ¥ 121,678,106 |  |  |  |
POSCO FUTURE M CO., LTD. [member] | ULTIUM CAM LIMITED PARTNERSHIP [Member] | Investissement Quebec, Strategic Innovation Fund [member] | CAD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 243,349 |  |  | $ 232,265,400 |  |  |
POSCO FUTURE M CO., LTD. [member] | ULTIUM CAM LIMITED PARTNERSHIP [Member] | Shinhan Bank [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 100,000,000 | 143,490 |  |  |  |  |  |
POSCO FUTURE M CO., LTD. [member] | Top of range [member] | ULTIUM CAM LIMITED PARTNERSHIP [Member] | Investissement Quebec, Strategic Innovation Fund [member] | CAD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 313,858 |  |  | $ 299,562,500 |  |  |
POSCO FUTURE M CO., LTD. [member] | Top of range [member] | ULTIUM CAM LIMITED PARTNERSHIP [Member] | Shinhan Bank [member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 100,000,000 | 143,490 |  |  |  |  |  |
POSCO AUSTRALIA PTY LTD [member] | Department of Trade and Investment (NSW Government) and others [member] | Woori Bank and others [member] | AUD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 18,014 |  |  |  | $ 18,744,862 |  |
POSCO AUSTRALIA PTY LTD [member] | Top of range [member] | Department of Trade and Investment (NSW Government) and others [member] | Woori Bank and others [member] | AUD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 18,014 |  |  |  | $ 18,744,862 |  |
PT Bio Inti Agrindo [member] | KSU Mandob [member] | Bank Muamalat [member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 502 |  |  |  |  | Rp 5,866,666,666 |
PT Bio Inti Agrindo [member] | Top of range [member] | KSU Mandob [member] | Bank Muamalat [member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 6,848 |  |  |  |  | 80,000,000,000 |
POSCO COATED STEEL (THAILAND) CO, LTD [member] | AMATA NATURAL GAS DISTRIBUTION COMPANY LIMITED and others [Member] | SC Bank [Member] | THB [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 2,492 |  |  |  |  |  | ฿ 54,614,000
POSCO COATED STEEL (THAILAND) CO, LTD [member] | BUREAU OF INDIAN STANDARDS (BIS) [Member] | SC Bank [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 10,000 | 14 |  |  |  |  |  |
POSCO COATED STEEL (THAILAND) CO, LTD [member] | Top of range [member] | AMATA NATURAL GAS DISTRIBUTION COMPANY LIMITED and others [Member] | SC Bank [Member] | THB [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 2,492 |  |  |  |  |  | ฿ 54,614,000
POSCO COATED STEEL (THAILAND) CO, LTD [member] | Top of range [member] | BUREAU OF INDIAN STANDARDS (BIS) [Member] | SC Bank [Member] | USD [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 10,000 | 14 |  |  |  |  |  |
POSCO Maharashtra Steel Private Limited [member] | Gail India and others [member] | Deutsche Bank and others [Member] | India, Rupees [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | 1,049,571,593 | 16,772 |  |  |  |  |  |
POSCO Maharashtra Steel Private Limited [member] | Top of range [member] | Gail India and others [member] | Deutsche Bank and others [Member] | India, Rupees [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount | $ 1,049,571,593 | 16,772 |  |  |  |  |  |
PT Prime Agri Resources [Member] | Koperasi Bakomo Diri Maju KBDM and others [Member] | Koperasi Simpan Pinjam Sahabat Mitra Sejati and others [Member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | 29,087 |  |  |  |  | 339,798,202,782 |
PT Prime Agri Resources [Member] | Top of range [member] | Koperasi Bakomo Diri Maju KBDM and others [Member] | Koperasi Simpan Pinjam Sahabat Mitra Sejati and others [Member] | IDR [member] |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Guarantee amount |  | ₩ 29,087 |  |  |  |  | Rp 339,798,202,782 |

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