XML 106 R96.htm IDEA: XBRL DOCUMENT v3.26.1
General Information - Details of Associates (Detail)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of associates [line items]    
Category of business [1] Steel manufacturing and sales  
Domestic [member] | New Songdo International City Development, LLC [member]    
Disclosure of associates [line items]    
Category of business Real estate rental  
Ownership (%) 29.90% 29.90%
Region Incheon  
Domestic [member] | Gale International Korea, LLC [member]    
Disclosure of associates [line items]    
Category of business Real estate rental  
Ownership (%) 29.90% 29.90%
Region Incheon  
Domestic [member] | KONES, Corp. [member]    
Disclosure of associates [line items]    
Category of business Technical service  
Ownership (%) 0.00% 27.41%
Region —  
Domestic [member] | CHUNGJU ENTERPRISE CITY DEVELOPMENT Co.,Ltd    
Disclosure of associates [line items]    
Category of business Real estate development  
Ownership (%) 29.53% 29.53%
Region Chungju  
Domestic [member] | DAEHO GLOBAL MANAGEMENT CO., LTD. [member]    
Disclosure of associates [line items]    
Category of business Investment advisory service  
Ownership (%) 35.82% 35.82%
Region Pohang  
Domestic [member] | Gunggi Green Energy [member]    
Disclosure of associates [line items]    
Category of business Electricity generation  
Ownership (%) 19.00% 19.00%
Region Hwaseong  
Domestic [member] | Pohang Special Welding Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Welding material and tools manufacturing and sales  
Ownership (%) 50.00% 50.00%
Region Pohang  
Domestic [member] | EQP POSCO Global No1 Natural Resources Private Equity Fund [member]    
Disclosure of associates [line items]    
Category of business Investment in new technologies  
Ownership (%) 27.23% 27.23%
Region Seoul  
Domestic [member] | KC Chemicals CORP [member]    
Disclosure of associates [line items]    
Category of business Machinery manufacturing  
Ownership (%) 18.76% 18.76%
Region Hwaseong  
Domestic [member] | Chun-cheon Energy Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Electricity generation  
Ownership (%) 49.10% 49.10%
Region Chuncheon  
Domestic [member] | Noeul Green Energy Co., Ltd [member]    
Disclosure of associates [line items]    
Category of business Electricity generation  
Ownership (%) 10.00% 10.00%
Region Seoul  
Domestic [member] | Posco-IDV Growth Ladder IP Fund [member]    
Disclosure of associates [line items]    
Category of business Investment in new technologies  
Ownership (%) 0.00% 17.86%
Region —  
Domestic [member] | Pohang E&E Co,. Ltd. [member]    
Disclosure of associates [line items]    
Category of business Investment in waste energy  
Ownership (%) 30.00% 30.00%
Region Pohang  
Domestic [member] | POSCO Energy Valley Fund [member]    
Disclosure of associates [line items]    
Category of business Investment in new technologies  
Ownership (%) 20.00% 20.00%
Region Pohang  
Domestic [member] | Posco Culture Contents Fund [member]    
Disclosure of associates [line items]    
Category of business Investment in new technologies  
Ownership (%) 31.68% 31.68%
Region Seoul  
Domestic [member] | PCC Amberstone Private Equity Fund I [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies  
Ownership (%) [2] 8.80% 8.80%
Region [2] Seoul  
Domestic [member] | UITrans LRT Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Transporting  
Ownership (%) 38.19% 38.19%
Region Seoul  
Domestic [member] | POSCO Advanced Technical Staff Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies  
Ownership (%) [2] 15.84% 15.87%
Region [2] Seoul  
Domestic [member] | POSCO 4th Industrial Revolution Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies  
Ownership (%) [2] 19.05% 19.05%
Region [2] Seoul  
Domestic [member] | Pureun Tongyeong Enviro Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Sewerage treatment  
Ownership (%) 20.40% 20.40%
Region Tongyeong  
Domestic [member] | Pure Gimpo Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Construction  
Ownership (%) 28.79% 28.79%
Region Gimpo  
Domestic [member] | Posgreen Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business [2] Lime and plaster manufacturing  
Ownership (%) [2] 19.00% 19.00%
Region [2] Gwangyang  
Domestic [member] | Clean Iksan Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Construction  
Ownership (%) 23.50% 23.50%
Region Iksan  
Domestic [member] | Innovalley Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Real estate development  
Ownership (%) 29.48% 29.48%
Region Yongin  
Domestic [member] | Blue Ocean private equity fund [member]    
Disclosure of associates [line items]    
Category of business Private equity financial  
Ownership (%) 27.52% 27.52%
Region Seoul  
Domestic [member] | Pocheon-Hwado Highway Corp. [member]    
Disclosure of associates [line items]    
Category of business Investment in Expressway  
Ownership (%) 27.89% 27.89%
Region Incheon  
Domestic [member] | INNOPOLIS Job Creation Fund II [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies  
Ownership (%) [2] 6.13% 6.13%
Region [2] Seoul  
Domestic [member] | Samcheok Blue Power Co.,Ltd. [member]    
Disclosure of associates [line items]    
Category of business Generation of electricity  
Ownership (%) 34.00% 34.00%
Region Samcheok  
Domestic [member] | INKOTECH INC [member]    
Disclosure of associates [line items]    
Category of business [2] Electricity generation and sales  
Ownership (%) [2] 10.00% 10.00%
Region [2] Seoul  
Domestic [member] | PCC Social Enterprise Fund II [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 16.67% 16.67%
Region [2] Seoul  
Domestic [member] | PCCConar No.1 Fund [Member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 14.88% 14.88%
Region [2] Pohang  
Domestic [member] | Hyochun CO., LTD [member]    
Disclosure of associates [line items]    
Category of business [2] Screen door operation  
Ownership (%) [2] 18.00% 18.00%
Region [2] Seoul  
Domestic [member] | IBKC-PCC 1st Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 18.18% 18.18%
Region [2] Pohang  
Domestic [member] | PCC-Woori LP secondary Fund [member]    
Disclosure of associates [line items]    
Category of business Investment in new technologies business  
Ownership (%) 18.85% 18.85%
Region Pohang  
Domestic [member] | Link City PFV Inc. [member]    
Disclosure of associates [line items]    
Category of business Contruction, housing construction and sales  
Ownership (%) 44.00% 44.00%
Region Uijeongbu  
Domestic [member] | BNH-POSCO Bio Healthcare Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 18.14% 18.14%
Region [2] Pohang  
Domestic [member] | PCC-BM Project Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 8.77% 8.77%
Region [2] Pohang  
Domestic [member] | Energy Innovation Fund I [Member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 10.11% 10.11%
Region [2] Pohang  
Domestic [member] | Consus PS development Professional Private Real Estate Fund [member]    
Disclosure of associates [line items]    
Category of business Real estate development  
Ownership (%) 50.00% 50.00%
Region Seoul  
Domestic [member] | POSTECH Holdings 4th Fund [member]    
Disclosure of associates [line items]    
Category of business Private Investment Association  
Ownership (%) 40.00% 40.00%
Region Pohang  
Domestic [member] | SNU STH IP Fund [Member]    
Disclosure of associates [line items]    
Category of business Private Investment Association  
Ownership (%) 33.33% 33.33%
Region Seoul  
Domestic [member] | G&G Technology Innovation Fund No.1 [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 13.97% 13.97%
Region [2] Seongnam  
Domestic [member] | PCC-KAI Secondary I Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 19.14% 19.12%
Region [2] Seoul  
Domestic [member] | 2021 PCC Bio New Technology Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies  
Ownership (%) [2] 5.45% 5.45%
Region [2] Pohang  
Domestic [member] | Consus BG Private Real Estate Fund No.2 [Member]    
Disclosure of associates [line items]    
Category of business Real estate development  
Ownership (%) 50.00% 50.00%
Region Seoul  
Domestic [member] | Consus NewDeal Infra Development Specialized Private Special Asset Investment Trust 1 [member]    
Disclosure of associates [line items]    
Category of business Investment Association  
Ownership (%) 40.00% 40.00%
Region Seoul  
Domestic [member] | Hybrid ESG Secondary Venture No.1 [Member]    
Disclosure of associates [line items]    
Category of business [2] Investment Association  
Ownership (%) [2] 18.27% 18.27%
Region [2] Pohang  
Domestic [member] | PCC-Bailey Project Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 7.27% 7.27%
Region [2] Pohang  
Domestic [member] | CR Inotech Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business [2] Manufacturing  
Ownership (%) [2] 19.00% 19.00%
Region [2] Gwangyang  
Domestic [member] | Posco JK Solid Solution Co., ltd [member]    
Disclosure of associates [line items]    
Category of business [2] Material manufacturing for rechargeable battery  
Ownership (%) [2] 40.00% 40.00%
Region [2] Yangsan  
Domestic [member] | PCC-Xinova PRE-IPO Fund [member]    
Disclosure of associates [line items]    
Category of business [2] Investment in new technologies business  
Ownership (%) [2] 0.91% 0.91%
Region [2] Pohang  
Domestic [member] | Consus OS Private Real Estate Fund 2 [Member]    
Disclosure of associates [line items]    
Category of business Real estate development  
Ownership (%) 50.00% 50.00%
Region Seoul  
Domestic [member] | C&P Advanced Material Technology Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Precursor manufacturing and sales  
Ownership (%) 20.00% 20.00%
Region Pohang  
Domestic [member] | P&O Chemical Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business [3] Chemical production  
Ownership (%) [3] 0.00% 51.00%
Region [3] —  
Domestic [member] | FEWM CO., LTD. [member]    
Disclosure of associates [line items]    
Category of business [4] Industrial gas production  
Ownership (%) [4] 40.00% 0.00%
Region [4] Yongin  
Domestic [member] | Gyeongbuk-Posco Innovative growth Venture Fund [member]    
Disclosure of associates [line items]    
Category of business [4] Investment in new technologies business  
Ownership (%) [4] 24.73% 0.00%
Region [4] Seoul  
Foreign [member] | POSCHROME (PROPRIETARY) LIMITED [member]    
Disclosure of associates [line items]    
Category of business Raw material manufacturing and sales  
Ownership (%) 50.00% 50.00%
Region South Africa  
Foreign [member] | CAML RESOURCES PTY LTD. [member]    
Disclosure of associates [line items]    
Category of business Raw material manufacturing and sales  
Ownership (%) 33.34% 33.34%
Region Australia  
Foreign [member] | PT. Wampu Electric Power [member]    
Disclosure of associates [line items]    
Category of business Construction and civil engineering  
Ownership (%) 20.00% 20.00%
Region Indonesia  
Foreign [member] | POSK(Pinghu) Steel Processing Center Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Steel processing and sales  
Ownership (%) 20.00% 20.00%
Region China  
Foreign [member] | PT.INDONESIA POS CHEMTECH CHOSUN Ref [member]    
Disclosure of associates [line items]    
Category of business Refractory manufacturing and sales  
Ownership (%) 30.19% 30.19%
Region Indonesia  
Foreign [member] | NS-Thainox Auto Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Stainless sales and transporting  
Ownership (%) 49.00% 49.00%
Region Thailand  
Foreign [member] | PT. Tanggamus Electric Power [member]    
Disclosure of associates [line items]    
Category of business Construction and civil engineering  
Ownership (%) 17.50% 17.50%
Region Indonesia  
Foreign [member] | LLP POSUK Titanium [member]    
Disclosure of associates [line items]    
Category of business Titanium manufacturing and sales  
Ownership (%) 35.30% 35.30%
Region Kazakhstan  
Foreign [member] | IMFA ALLOYS FINLEASE LTD. [member]    
Disclosure of associates [line items]    
Category of business Raw material manufacturing and sales  
Ownership (%) 24.00% 24.00%
Region India  
Foreign [member] | KRAKATAU POS-CHEM DONG-SUH CHEMICAL [member]    
Disclosure of associates [line items]    
Category of business Chemical by-product manufacturing and sales  
Ownership (%) 19.00% 19.00%
Region Indonesia  
Foreign [member] | 9404-5515 Quebec Inc. [member]    
Disclosure of associates [line items]    
Category of business Investments management  
Ownership (%) 25.85% 25.85%
Region Canada  
Foreign [member] | Hamparan Mulya [member]    
Disclosure of associates [line items]    
Category of business Resource development  
Ownership (%) 45.00% 45.00%
Region Indonesia  
Foreign [member] | POS-SEAHSTEELWIRE(TIANJIN)CO.,Ltd. [member]    
Disclosure of associates [line items]    
Category of business Steel manufacturing and sales  
Ownership (%) 25.00% 25.00%
Region China  
Foreign [member] | POS-SeAH Steel Wire(Nantong) Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Steel processing and sales  
Ownership (%) 25.00% 25.00%
Region China  
Foreign [member] | POS-SeAH Steel Wire (Thailand) Co., Ltd. [member]    
Disclosure of associates [line items]    
Category of business Steel manufacturing and sales  
Ownership (%) 25.00% 25.00%
Region Thailand  
Foreign [member] | Jupiter Mines Limited [member]    
Disclosure of associates [line items]    
Category of business [2] Resource development  
Ownership (%) [2] 6.89% 6.89%
Region [2] Australia  
Foreign [member] | SAMHWAN VINA CO., LTD [member]    
Disclosure of associates [line items]    
Category of business [2] Steel manufacturing and sales  
Ownership (%) [2] 17.26% 17.26%
Region [2] Vietnam  
Foreign [member] | Saudi-Korean Company for Maintenance Properties Management LLC [member]    
Disclosure of associates [line items]    
Category of business [2] Building management  
Ownership (%) [2] 19.00% 19.00%
Region [2] Saudi Arabia  
Foreign [member] | NCR LLC [member]    
Disclosure of associates [line items]    
Category of business Coal sales  
Ownership (%) 22.05% 22.05%
Region Canada  
Foreign [member] | SHANGHAI LANSHENG DAEWOO CORP. [member]    
Disclosure of associates [line items]    
Category of business Trading  
Ownership (%) 49.00% 49.00%
Region China  
Foreign [member] | SHANGHAI WAIGAOQIAO FREE TRADE ZONE LANSHENG DAEWOO IN'L TRADING CO., LTD. [member]    
Disclosure of associates [line items]    
Category of business Trading  
Ownership (%) 49.00% 49.00%
Region China  
Foreign [member] | General Medicines Company Ltd. [member]    
Disclosure of associates [line items]    
Category of business Medicine manufacturing and sales  
Ownership (%) 33.00% 33.00%
Region Sudan  
Foreign [member] | KOREA LNG LTD. [member]    
Disclosure of associates [line items]    
Category of business Gas production and sales  
Ownership (%) 20.00% 20.00%
Region England  
Foreign [member] | South-East Asia Gas Pipeline Company Ltd. [member]    
Disclosure of associates [line items]    
Category of business Pipeline construction and management  
Ownership (%) 25.04% 25.04%
Region Myanmar  
Foreign [member] | GLOBAL KOMSCO Daewoo LLC [member]    
Disclosure of associates [line items]    
Category of business Cotton celluloid manufacturing and sales  
Ownership (%) 35.00% 35.00%
Region Uzbekistan  
Foreign [member] | POSCO-Poggenamp Electrical Steel Pvt. Ltd. [member]    
Disclosure of associates [line items]    
Category of business [3] Steel processing and sales  
Ownership (%) [3] 0.00% 26.00%
Region [3] —  
Foreign [member] | Qingdao Pohang DGENX Stainless Steel Pipe Co Ltd [member]    
Disclosure of associates [line items]    
Category of business Exhaust meter manufacturing  
Ownership (%) 40.00% 40.00%
Region China  
Foreign [member] | SHINPOONG DAEWOO PHARMA VIETNAM CO.,LTD [member]    
Disclosure of associates [line items]    
Category of business [3] Medicine production  
Ownership (%) [3] 0.00% 3.42%
Region [3] —  
Foreign [member] | ZHEJIANG HUAYOU-POSCO ESM CO., LTD [member]    
Disclosure of associates [line items]    
Category of business Anode material Production  
Ownership (%) 40.00% 40.00%
Region China  
Foreign [member] | MONG DUONG FINANCE HOLDINGS B.V    
Disclosure of associates [line items]    
Category of business [3] Financial Holdings  
Ownership (%) [3] 0.00% 30.00%
Region [3] —  
Foreign [member] | FQM Australia Holdings Pty Ltd [Member]    
Disclosure of associates [line items]    
Category of business Non-ferrous metal Mining  
Ownership (%) 24.32% 24.32%
Region Australia  
Foreign [member] | Qingdao ZhongShou New Energy Technology Co Ltd [Member]    
Disclosure of associates [line items]    
Category of business [2] Artificial Graphite manufacturing  
Ownership (%) [2] 13.00% 13.00%
Region [2] China  
Foreign [member] | Black Rock Mining Limited [Member]    
Disclosure of associates [line items]    
Category of business Mining  
Ownership (%) 7.45% 10.07%
Region Australia  
Foreign [member] | Inner Mongolia Sinuo New Material Technology Co.,Ltd [member]    
Disclosure of associates [line items]    
Category of business [2] Artificial Graphite manufacturing  
Ownership (%) [2] 10.12% 12.85%
Region [2] China  
Foreign [member] | ZHANGJIAGANG XIAO-SHA COIL SERVICE CENTER CO.,LTD [member]    
Disclosure of associates [line items]    
Category of business Steel processing and sales  
Ownership (%) 17.50% 17.50%
Region China  
Foreign [member] | AES-VCM Mong Duong Power Company Limited [member]    
Disclosure of associates [line items]    
Category of business [3] Electricity generation  
Ownership (%) [3] 0.00% 30.00%
Region [3] —  
Foreign [member] | AJI Marketing and Sales, LLC [Member]    
Disclosure of associates [line items]    
Category of business Coal sales  
Ownership (%) 0.00% 22.05%
Region —  
Foreign [member] | AMCI (WA) PTY LTD. [member]    
Disclosure of associates [line items]    
Category of business Iron ore sales & mine development  
Ownership (%) 49.00% 49.00%
Region Australia  
Foreign [member] | M RES NSW HCC II Pty Ltd [Member]    
Disclosure of associates [line items]    
Category of business [4],[5] Mining  
Ownership (%) [4],[5] 92.31% 0.00%
Region [4],[5] Australia  
Foreign [member] | POSCO FLOW Holdings(Thailand) Co., Ltd [member]    
Disclosure of associates [line items]    
Category of business [4] Logistics  
Ownership (%) [4] 49.00% 0.00%
Region [4] Thailand  
Foreign [member] | Posco Flow(Thailand) Co., Ltd [member]    
Disclosure of associates [line items]    
Category of business [4] Logistics  
Ownership (%) [4] 49.00% 0.00%
Region [4] Thailand  
[1] As of December 31, 2025, the entities are classified as consolidated subsidiaries since the Company has control over the investees although the Company’s percentage of ownership is 50% or less, considering the structure of the entities’ Board of Directors and others.
[2] The Company has determined that it has significant influence even though the Company’s percentage of ownership is less than 20% considering the composition of board of directors.
[3] During the year ended December 31, 2025, the entities were excluded from associates due to sale of interest.
[4] During the year ended December 31, 2025, the entities were included as associates.
[5] Although the Company holds a majority equity interest as of year-end, it has determined that it has significant influence considering its representation on the board of directors, and thus classified it as an investment in an associate.