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Commitments and Contingencies - Litigations in Progress (Detail) - 12 months ended Dec. 31, 2025 ₺ in Millions, ₩ in Millions, ₨ in Millions, ₨ in Millions, ฿ in Millions, ¥ in Millions, Rp in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions | USD ($) Cash_Generating_Units | KRW (₩) | CNY (¥) | IDR (Rp) | THB (฿) | INR (₨) | PKR (₨) | ARS ($) | BRL (R$) | TRY (₺) | MXN ($)
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POSCO HOLDINGS INC. [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Description | POSCO HOLDINGS INC. has provided 3 blank checks to Korea Energy Agency as collateral for long-term foreign currency borrowings. |  |  |  |  |  |  |  |  |  |
POSCO INTERNATIONAL Corporation [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Description | As of December 31, 2025, POSCO INTERNATIONAL Corporation has provided 19 blank promissory notes and 12 blank checks to Korea Energy Agency and others as collateral for the guarantee on performance for contracts and others. |  |  |  |  |  |  |  |  |  |
POSCO Eco & Challenge Co., Ltd. [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Description | As of December 31, 2025, POSCO Eco & Challenge Co., Ltd. has provided 40 blank checks and 4 blank promissory notes as collateral for agreements and outstanding loans. |  |  |  |  |  |  |  |  |  |
POSCO DX Co., Ltd. |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Description | As of December 31, 2025, POSCO DX Co., Ltd. has provided 7 blank checks to financial institutions as collateral for the guarantee on performance for contracts and others. |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO HOLDINGS INC. [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 3 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | ₩ 669 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 181 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 542,579 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for employee right and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO INTERNATIONAL Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 0 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO Eco & Challenge Co., Ltd. [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 136 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 503,451 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO STEELEON Co.,Ltd. [Member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 271 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO DX Co., Ltd. | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 8 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 3,401 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO FUTURE M CO., LTD. [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 600 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO A&C [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 7 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 2,485 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO WIDE Co., Ltd. [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 3 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 322 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO Mobility Solution Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 2 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 615 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
KRW [member] | POSCO ZT AIR SOLUTION [Member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | ₩ |  | 25 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
INR [member] | POSCO INTERNATIONAL Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 2 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 71,421 |  |  |  | ₨ 4,469,396 |  |  |  |  |
Description | Lawsuit on claim for payment on guarantees and others |  |  |  |  |  |  |  |  |  |
INR [member] | POSCO Engineering and Construction India Private Limited [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 2 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 7,894 |  |  |  | 493,968 |  |  |  |  |
Description | Lawsuit on claim for payment and others |  |  |  |  |  |  |  |  |  |
INR [member] | POSCO INDIA PROCESSING CENTER PRIVATE LIMITED [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 870 |  |  |  | 54,420 |  |  |  |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
INR [member] | POSCO Maharashtra Steel Private Limited [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 152 |  |  |  | 9,500 |  |  |  |  |
Description | Lawsuit on claim for labor and others |  |  |  |  |  |  |  |  |  |
INR [member] | POSCO-India Private Limited [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 39 |  |  |  | ₨ 2,466 |  |  |  |  |
Description | Lawsuit on claim for wages |  |  |  |  |  |  |  |  |  |
PKR [member] | POSCO INTERNATIONAL Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 639 |  |  |  |  | ₨ 124,775 |  |  |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
ARS [member] | POSCO INTERNATIONAL Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 2 |  |  |  |  |  | $ 1,800 |  |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
USD [member] | POSCO INTERNATIONAL Corporation [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 5 |  |  |  |  |  |  |  |  |  |
Claim amount | $ 72,662 | 104,263 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
USD [member] | POSCO-China Holding Corp. [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | $ 2,580 | 3,702 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for damages and others |  |  |  |  |  |  |  |  |  |
USD [member] | Pos-Sea Pte Ltd [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount | $ 3,200 | 4,592 |  |  |  |  |  |  |  |  |
Description | Lawsuit over contract dispute and others |  |  |  |  |  |  |  |  |  |
USD [member] | POSCO ASSAN TST STEEL INDUSTRY [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 27 |  |  |  |  |  |  |  |  |  |
Claim amount | $ 132 | 189 |  |  |  |  |  |  |  |  |
Description | Lawsuit on claim for labor and others |  |  |  |  |  |  |  |  |  |
BRL [member] | POSCO DX Co., Ltd. | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 5,722 |  |  |  |  |  |  | R$ 21,845 |  |
Description | Lawsuit on claim for damages |  |  |  |  |  |  |  |  |  |
BRL [member] | Brazil Sao Paulo Steel Processing Center [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 7 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 1,763 |  |  |  |  |  |  | R$ 6,729 |  |
Description | Lawsuit on claim for labor and others |  |  |  |  |  |  |  |  |  |
CNY [member] | POSCO(Chongqing) Automotive Processing Center Co., Ltd [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 104 | ¥ 510 |  |  |  |  |  |  |  |
Description | Lawsuit on claim for penalty payment |  |  |  |  |  |  |  |  |  |
THB [Member] | POSCO Thainox Public Company Limited [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 2 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 159 |  |  | ฿ 3,480 |  |  |  |  |  |
Description | Lawsuit on invalidation of a check |  |  |  |  |  |  |  |  |  |
TRY [member] | POSCO-TNPC [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 0 |  |  |  |  |  |  |  | ₺ 0 |
Description | Lawsuit on claim for labor |  |  |  |  |  |  |  |  |  |
Mexico, Pesos | POSCO MPPC SA de CV [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 4 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 393 |  |  |  |  |  |  |  |  | $ 4,924
Description | Lawsuit on claim for labor and others |  |  |  |  |  |  |  |  |  |
IDR [member] | PT. POSCO E&C INDONESIA [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 1 |  |  |  |  |  |  |  |  |  |
Claim amount |  | 1,161 |  | Rp 13,561,952 |  |  |  |  |  |  |
Description | Lawsuit on claim for payment and others |  |  |  |  |  |  |  |  |  |
IDR [member] | PT. KRAKATAU POSCO [member] | Litigations in progress [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |
Legal actions | 2 |  |  |  |  |  |  |  |  |  |
Claim amount |  | ₩ 951 |  | Rp 11,108,052 |  |  |  |  |  |  |
Description | Lawsuit over contract dispute and others |  |  |  |  |  |  |  |  |  |

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