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General Information - Details of Consolidated Subsidiaries (Detail)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of subsidiaries [line items]    
Principal operations [1] Steel manufacturing and sales  
Ownership (%) [1] 43.00% 43.00%
Region [1] China  
Domestic [member] | POSCO [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel, rolled products and plates  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO Eco & Challenge Co., Ltd    
Disclosure of subsidiaries [line items]    
Principal operations Engineering and construction  
Ownership (%) 52.80% 52.80%
Region Pohang  
Domestic [member] | POSCO Eco & Challenge Co., Ltd | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 52.80% 52.80%
Domestic [member] | POSCO STEELEON Co., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Coated steel manufacturing  
Ownership (%) 56.96% 56.96%
Region Pohang  
Domestic [member] | POSCO STEELEON Co., Ltd. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 56.96% 56.96%
Domestic [member] | POSCO DX Co., Ltd.[member]    
Disclosure of subsidiaries [line items]    
Principal operations Computer hardware and software distribution  
Ownership (%) 65.47% 65.47%
Region Pohang  
Domestic [member] | POSCO DX Co., Ltd.[member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 65.47% 65.47%
Domestic [member] | POSCO Research Institute [member]    
Disclosure of subsidiaries [line items]    
Principal operations Economic research and consulting  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | POSCO Research Institute [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO WIDE Co Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Business facility maintenance  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | POSCO WIDE Co Ltd [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO A&C [member]    
Disclosure of subsidiaries [line items]    
Principal operations Architecture and consulting  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | POSCO A&C [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO Venture Capital Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO Venture Capital Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | eNtoB Corporation [member]    
Disclosure of subsidiaries [line items]    
Principal operations Electronic commerce  
Ownership (%) 69.32% 69.32%
Region Seoul  
Domestic [member] | eNtoB Corporation [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 69.32% 69.32%
Domestic [member] | POSCO FUTURE M CO.,LTD.    
Disclosure of subsidiaries [line items]    
Principal operations Refractories, Anode/Cathode materials manufacturing and sales  
Ownership (%) 58.18% 59.74%
Region Pohang  
Domestic [member] | POSCO FUTURE M CO.,LTD. | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 58.18% 59.74%
Domestic [member] | POSCO FLOW Co Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Transporting and warehousing  
Ownership (%) 100.00% 100.00%
Region Gwangyang  
Domestic [member] | POSCO FLOW Co Ltd [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO M-TECH [member]    
Disclosure of subsidiaries [line items]    
Principal operations [1] Packing materials manufacturing and sales  
Ownership (%) [1] 48.85% 48.85%
Region [1] Pohang  
Domestic [member] | POSCO M-TECH [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [1] 48.85% 48.85%
Domestic [member] | PNR [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel by product manufacturing and sales  
Ownership (%) 70.00% 70.00%
Region Pohang  
Domestic [member] | PNR [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Domestic [member] | POSCO WOMAN'S FUND [member]    
Disclosure of subsidiaries [line items]    
Principal operations [1] Investment in venture companies  
Ownership (%) [1] 40.00% 40.00%
Region [1] Seoul  
Domestic [member] | POSCO WOMAN'S FUND [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [1] 40.00% 40.00%
Domestic [member] | POSCO Group University [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Education service and real estate business  
Ownership (%) 100.00% 100.00%
Region Incheon  
Domestic [member] | Growth Ladder POSCO K-Growth Global Fund [member]    
Disclosure of subsidiaries [line items]    
Principal operations [1] Investment in venture companies  
Ownership (%) [1] 50.00% 50.00%
Region [1] Pohang  
Domestic [member] | Growth Ladder POSCO K-Growth Global Fund [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [1] 50.00% 50.00%
Domestic [member] | POSCO IH    
Disclosure of subsidiaries [line items]    
Principal operations Intellectual Property Services and consulting  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | POSCO IH | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | TANCHEON E&E [member]    
Disclosure of subsidiaries [line items]    
Principal operations Refuse derived fuel and power generation  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | TANCHEON E&E [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO Humans [member]    
Disclosure of subsidiaries [line items]    
Principal operations Business assistance service  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO Humans [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | Mapo Hibroad Parking Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction  
Ownership (%) 71.00% 71.00%
Region Seoul  
Domestic [member] | Mapo Hibroad Parking Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 71.00% 71.00%
Domestic [member] | Busan E&E Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Refuse derived fuel and power generation  
Ownership (%) 70.00% 70.00%
Region Busan  
Domestic [member] | Busan E&E Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Domestic [member] | POSCO INTERNATIONAL Corporation [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading, power generation, energy & resource development and others  
Ownership (%) 72.98% 72.98%
Region Seoul  
Domestic [member] | POSCO INTERNATIONAL Corporation [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 72.98% 72.98%
Domestic [member] | Pohang Scrap Recycling Distribution Center Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel processing and sales  
Ownership (%) 51.00% 51.00%
Region Pohang  
Domestic [member] | Pohang Scrap Recycling Distribution Center Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 51.00% 51.00%
Domestic [member] | Songdo Development PMC (Project Management Company) LLC. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Housing business agency  
Ownership (%) 100.00% 100.00%
Region Incheon  
Domestic [member] | Songdo Development PMC (Project Management Company) LLC. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | Korea Fuel Cell [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Fuel cell  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | Korea Fuel Cell [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO GEM 1st Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO GEM 1st Fund [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 98.82% 98.81%
Domestic [member] | POSCO GEM 1st Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 1.18% 1.19%
Domestic [member] | POSCO MOBILITY SOLUTION [member]    
Disclosure of subsidiaries [line items]    
Principal operations STC, TMC, Plate manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Cheonan  
Domestic [member] | POSCO MOBILITY SOLUTION [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | Posco New Growth [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | Posco New Growth [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 99.89% 99.89%
Domestic [member] | Posco New Growth [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.11% 0.11%
Domestic [member] | IMP Fund I [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 98.05% 98.05%
Region Pohang  
Domestic [member] | IMP Fund I [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 98.05% 98.05%
Domestic [member] | POSCO-Pilbara LITHIUM SOLUTION CO., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Lithium manufacturing and sales  
Ownership (%) 82.00% 82.00%
Region Gwangyang  
Domestic [member] | POSCO-Pilbara LITHIUM SOLUTION CO., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 82.00% 82.00%
Domestic [member] | POSCO-HY Clean Metal Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Non-ferrous metal smelting  
Ownership (%) 100.00% 75.00%
Region Gwangyang  
Domestic [member] | POSCO-HY Clean Metal Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 75.00%
Domestic [member] | Consus Pf private Real Estate Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations REITs  
Ownership (%) 0.00% 66.67%
Domestic [member] | Consus Pf private Real Estate Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 66.67%
Domestic [member] | New Energy Hub [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Electricity and gas supply  
Ownership (%) 0.00% 100.00%
Region —  
Domestic [member] | New Energy Hub [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Domestic [member] | Posco Busan Newdeal Fund [member]    
Disclosure of subsidiaries [line items]    
Principal operations [1] Investment in venture companies  
Ownership (%) [1] 32.00% 32.00%
Region [1] Pohang  
Domestic [member] | Posco Busan Newdeal Fund [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [1] 32.00% 32.00%
Domestic [member] | Shinan Green Energy Co., LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Electricity production  
Ownership (%) 54.53% 54.53%
Region Shinahn  
Domestic [member] | Shinan Green Energy Co., LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 54.53% 54.53%
Domestic [member] | eSteel4U [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Wholesales and retail  
Ownership (%) 61.12% 61.12%
Region Seoul  
Domestic [member] | eSteel4U [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 61.12% 61.12%
Domestic [member] | POSCO social investment fund [member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 70.00% 70.00%
Region Pohang  
Domestic [member] | POSCO social investment fund [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 20.00% 20.00%
Domestic [member] | POSCO social investment fund [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 50.00% 50.00%
Domestic [member] | Consus Pf Private Real Estate Fund No.2 [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate development  
Ownership (%) 0.00% 66.67%
Domestic [member] | Consus Pf Private Real Estate Fund No.2 [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 66.67%
Domestic [member] | POSCO GS Eco Materials Co., Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Rechargeable battery  
Ownership (%) 70.25% 51.00%
Region Seoul  
Domestic [member] | POSCO GS Eco Materials Co., Ltd [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.25% 51.00%
Domestic [member] | POSCO Lithium Solution CO., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Lithium manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Gwangyang  
Domestic [member] | POSCO Lithium Solution CO., Ltd. [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | QSONE Co.,Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate rental  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | QSONE Co.,Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO PS Tech [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO PS Tech [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO PR Tech [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO PR Tech [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO PH Solution [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO PH Solution [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO GYS Tech [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Gwangyang  
Domestic [member] | POSCO GYS Tech [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO GYR Tech [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Gwangyang  
Domestic [member] | POSCO GYR Tech [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO GY Solution [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Maintenance service  
Ownership (%) 100.00% 100.00%
Region Gwangyang  
Domestic [member] | POSCO GY Solution [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | PCC Facilities Component Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment Association  
Ownership (%) 60.00% 60.00%
Region Pohang  
Domestic [member] | PCC Facilities Component Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Domestic [member] | POSCO HOLDINGS CVC 2nd Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies business  
Ownership (%) 100.00% 100.00%
Region Pohang  
Domestic [member] | POSCO HOLDINGS CVC 2nd Fund [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 98.77% 98.76%
Domestic [member] | POSCO HOLDINGS CVC 2nd Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 1.23% 1.24%
Domestic [member] | International Energy Expansion for Technology Innovation Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies business  
Ownership (%) 60.00% 60.00%
Region Pohang  
Domestic [member] | International Energy Expansion for Technology Innovation Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Domestic [member] | POSCO CNGR Nickel Solution [Member]    
Disclosure of subsidiaries [line items]    
Principal operations High-Purity nickel manufacturing and sales  
Ownership (%) 0.00% 60.00%
Region —  
Domestic [member] | POSCO CNGR Nickel Solution [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 60.00%
Domestic [member] | POSCO CVC Scale-Up Fund    
Disclosure of subsidiaries [line items]    
Principal operations Investment in venture companies  
Ownership (%) 60.00% 60.00%
Region Pohang  
Domestic [member] | POSCO CVC Scale-Up Fund | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Domestic [member] | SK SOLAR POWER GENERATION COPORATION [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Power generation  
Ownership (%) 0.00% 100.00%
Region —  
Domestic [member] | SK SOLAR POWER GENERATION COPORATION [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Domestic [member] | POSCO ZT AIR SOLUTION [Member]    
Disclosure of subsidiaries [line items]    
Principal operations High-Purity rare gas manufacturing and sales  
Ownership (%) 75.10% 75.10%
Region Gwangyang  
Domestic [member] | POSCO ZT AIR SOLUTION [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 75.10% 75.10%
Domestic [member] | RNR logistics [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Logistics and warehousing  
Ownership (%) 100.00% 100.00%
Region Seoul  
Domestic [member] | RNR logistics [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | Mastern No.123 Yeoju Samgyo PFV CO., Ltd    
Disclosure of subsidiaries [line items]    
Principal operations Logistics and warehousing  
Ownership (%) 0.00% 100.00%
Region —  
Domestic [member] | Mastern No.123 Yeoju Samgyo PFV CO., Ltd | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Domestic [member] | Posco Silicon Solution Co., Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Other engineering R&D industries  
Ownership (%) 100.00% 100.00%
Region Sejong  
Domestic [member] | Posco Silicon Solution Co., Ltd [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Domestic [member] | POSCO Group AC Fund I [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 100.00%  
Region Pohang  
Domestic [member] | POSCO Group AC Fund I [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 98.38%  
Domestic [member] | POSCO Group AC Fund I [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 1.62%  
Domestic [member] | POSCO Safety Solution [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Safety consulting  
Ownership (%) 100.00%  
Region Seongnam  
Domestic [member] | POSCO Safety Solution [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | POSCO Safety Solution [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00%  
Domestic [member] | POSCO DEEPTECH IP FUND [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 60.00%  
Region Pohang  
Domestic [member] | POSCO DEEPTECH IP FUND [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00%  
Domestic [member] | FUTURE GRAPH CO LTD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Spherical graphite manufacturing  
Ownership (%) 100.00%  
Region Gunsan  
Domestic [member] | FUTURE GRAPH CO LTD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | CHEMGAS KOREA CO., LTD.    
Disclosure of subsidiaries [line items]    
Principal operations Specialty gass refining and sales  
Ownership (%) 100.00%  
Region Eumseong  
Domestic [member] | CHEMGAS KOREA CO., LTD. | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | POSCOEVER NEW MEDICAL Investment Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 60.00%  
Region Seoul  
Domestic [member] | POSCOEVER NEW MEDICAL Investment Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00%  
Domestic [member] | POSCO Stainless Precision And Processing [Member]    
Disclosure of subsidiaries [line items]    
Principal operations STS  
Ownership (%) 100.00%  
Region Ansan  
Domestic [member] | POSCO Stainless Precision And Processing [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | POSCO INTERNATIONAL CVC 1st Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 100.00%  
Region Pohang  
Domestic [member] | POSCO INTERNATIONAL CVC 1st Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | POSCO CVC 1st Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 100.00%  
Region Pohang  
Domestic [member] | POSCO CVC 1st Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | New Zero 2nd Co Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations SPC  
Ownership (%) 100.00%  
Region Seoul  
Domestic [member] | New Zero 2nd Co Ltd [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | POSCO DX CVC 1st Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 100.00%  
Region Pohang  
Domestic [member] | POSCO DX CVC 1st Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Domestic [member] | Startup Korea Posco group Openinnovation Fund [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Investment in new technologies  
Ownership (%) 70.00%  
Region Pohang  
Domestic [member] | Startup Korea Posco group Openinnovation Fund [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00%  
Domestic [member] | FLOW K CO Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Logistics and warehousing  
Ownership (%) 70.00%  
Region Gwangyang  
Domestic [member] | FLOW K CO Ltd [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00%  
Foreign [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   100.00%
Foreign [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   100.00%
Foreign [member] | POSCO America Corporation [member]    
Disclosure of subsidiaries [line items]    
Principal operations Research&Consulting  
Ownership (%) 99.99% 99.99%
Region USA  
Foreign [member] | POSCO America Corporation [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 99.45% 99.45%
Foreign [member] | POSCO America Corporation [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.54% 0.54%
Foreign [member] | POSCO AUSTRALIA PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Raw material sales & mine development  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POSCO AUSTRALIA PTY LTD [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Canada Ltd [member]    
Disclosure of subsidiaries [line items]    
Principal operations Coal sales  
Ownership (%) 100.00% 100.00%
Region Canada  
Foreign [member] | POSCO Canada Ltd [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Asia Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Finance  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO Asia Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-CTPC Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO-CTPC Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO E&C Vietnam Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel structure manufacturing and sales  
Ownership (%) 0.00% 100.00%
Region —  
Foreign [member] | POSCO E&C Vietnam Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Foreign [member] | POSCO (Zhangjiagang) Stainless Steel Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Stainless steel manufacturing and sales  
Ownership (%) 82.48% 82.48%
Region China  
Foreign [member] | POSCO (Zhangjiagang) Stainless Steel Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 58.60% 58.60%
Foreign [member] | POSCO (Zhangjiagang) Stainless Steel Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 23.88% 23.88%
Foreign [member] | POSCO (Thailand) Company Limited [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Thailand  
Foreign [member] | POSCO (Thailand) Company Limited [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-MKPC SDN BHD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 70.00% 70.00%
Region Malaysia  
Foreign [member] | POSCO-MKPC SDN BHD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Foreign [member] | Qingdao Pohang Stainless Steel Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Stainless steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | Qingdao Pohang Stainless Steel Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Foreign [member] | Qingdao Pohang Stainless Steel Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 30.00% 30.00%
Foreign [member] | POSCO (Suzhou) Automotive Processing Center Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO (Suzhou) Automotive Processing Center Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 90.00% 90.00%
Foreign [member] | POSCO (Suzhou) Automotive Processing Center Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 10.00% 10.00%
Foreign [member] | POSCO-China Qingdao Processing Center Co. Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO-China Qingdao Processing Center Co. Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POS-ORE PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Iron ore development and sales  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POS-ORE PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-China Holding Corp. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Holding company  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO-China Holding Corp. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO JAPAN Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel Marketing, demand development and technology research  
Ownership (%) 100.00% 100.00%
Region Japan  
Foreign [member] | POSCO JAPAN Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POS-GC PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Coal sales  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POS-GC PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-India Private Limited [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO-India Private Limited [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-India Pune Processing Center. Pvt. Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 65.00%
Region India  
Foreign [member] | POSCO-India Pune Processing Center. Pvt. Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   0.00%
Foreign [member] | POSCO-India Pune Processing Center. Pvt. Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 65.00%
Foreign [member] | POSCO Japan PC CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 86.12% 86.12%
Region Japan  
Foreign [member] | POSCO Japan PC CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 86.12% 86.12%
Foreign [member] | POSCO-CFPC Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO-CFPC Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 44.66% 44.66%
Foreign [member] | POSCO-CFPC Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 55.34% 55.34%
Foreign [member] | POSCO E&C CHINA Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Civil engineering and construction  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO E&C CHINA Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO MPPC S.A. de C.V. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 96.31%
Region Mexico  
Foreign [member] | POSCO MPPC S.A. de C.V. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 21.02% 21.02%
Foreign [member] | POSCO MPPC S.A. de C.V. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 78.98% 75.29%
Foreign [member] | Zhangjigang Pohang Port Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Loading and unloading service  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | Zhangjigang Pohang Port Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-VIETNAM Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Vietnam  
Foreign [member] | POSCO-VIETNAM Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO MEXICO S.A. DE C.V. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Automotive steel sheet manufacturing and sales  
Ownership (%) 98.16% 98.16%
Region Mexico  
Foreign [member] | POSCO MEXICO S.A. DE C.V. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 98.16% 98.16%
Foreign [member] | POSCO-Poland Wroclaw Processing Center Sp. z o. o.    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 60.00% 60.00%
Region Poland  
Foreign [member] | POSCO-Poland Wroclaw Processing Center Sp. z o. o. | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Foreign [member] | POS-NP PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Coal sales  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POS-NP PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | DAEWOO INTERNATIONAL SHANGHAI WAIGAOQIAO CO., LTD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Intermediary trade & bonded warehouse operation  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | DAEWOO INTERNATIONAL SHANGHAI WAIGAOQIAO CO., LTD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT. Bio Inti Agrindo [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Forest resources development  
Ownership (%) 85.00% 85.00%
Region Indonesia  
Foreign [member] | PT. Bio Inti Agrindo [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 85.00% 85.00%
Foreign [member] | POSCO ENGINEERING AND CONSTRUCTION AUSTRALIA (POSCO E&C AUSTRALIA) PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction and engineering service  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POSCO ENGINEERING AND CONSTRUCTION AUSTRALIA (POSCO E&C AUSTRALIA) PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-TISCO (JILIN) PROCESSING CENTER Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 60.00% 60.00%
Region China  
Foreign [member] | POSCO-TISCO (JILIN) PROCESSING CENTER Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 50.00% 50.00%
Foreign [member] | POSCO-TISCO (JILIN) PROCESSING CENTER Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 10.00% 10.00%
Foreign [member] | POSCO Thainox Public Company Limited [member]    
Disclosure of subsidiaries [line items]    
Principal operations STS cold-rolled steel manufacturing and sales  
Ownership (%) 74.56% 74.56%
Region Thailand  
Foreign [member] | POSCO Thainox Public Company Limited [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 74.56% 74.56%
Foreign [member] | HUNCHUN POSCO HMM INTERNATIONAL LOGISTICS CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Logistics  
Ownership (%) 81.55% 81.55%
Region China  
Foreign [member] | HUNCHUN POSCO HMM INTERNATIONAL LOGISTICS CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 81.55% 81.55%
Foreign [member] | POSCO INTERNATIONAL VIETNAM CO., LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Vietnam  
Foreign [member] | POSCO INTERNATIONAL VIETNAM CO., LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO (Chongqing) Automotive Processing Center Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO (Chongqing) Automotive Processing Center Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | SUZHOU POSCO-CORE TECHNOLOGY CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Component manufacturing and sales  
Ownership (%) 0.00% 100.00%
Region —  
Foreign [member] | SUZHOU POSCO-CORE TECHNOLOGY CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Foreign [member] | PT.KRAKATAU POSCO FUTUREM [member]    
Disclosure of subsidiaries [line items]    
Principal operations Quicklime manufacturing and sales  
Ownership (%) 80.00% 80.00%
Region Indonesia  
Foreign [member] | PT.KRAKATAU POSCO FUTUREM [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 80.00% 80.00%
Foreign [member] | POSCO AFRICA (PROPRIETARY) LIMITED [member]    
Disclosure of subsidiaries [line items]    
Principal operations Mine development  
Ownership (%) 100.00% 100.00%
Region South Africa  
Foreign [member] | POSCO AFRICA (PROPRIETARY) LIMITED [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Center Beijing [member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate development, rental and management  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO Center Beijing [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-Malaysia SDN. BHD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 95.42% 95.42%
Region Malaysia  
Foreign [member] | POSCO-Malaysia SDN. BHD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 95.42% 95.42%
Foreign [member] | PT KRAKATAU BLUE WATER [member]    
Disclosure of subsidiaries [line items]    
Principal operations Wastewater treatment facilities operation and maintenance  
Ownership (%) 67.00% 67.00%
Region Indonesia  
Foreign [member] | PT KRAKATAU BLUE WATER [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 67.00% 67.00%
Foreign [member] | POSCO INTERNATIONAL MYANMAR CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Myanmar  
Foreign [member] | POSCO INTERNATIONAL MYANMAR CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO-Italy Processing Center [member]    
Disclosure of subsidiaries [line items]    
Principal operations Stainless steel sheet manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Italy  
Foreign [member] | POSCO-Italy Processing Center [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 88.89% 88.89%
Foreign [member] | POSCO-Italy Processing Center [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 11.11% 11.11%
Foreign [member] | Myanmar POSCO C&C Company, Limited. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 70.00% 70.00%
Region Myanmar  
Foreign [member] | Myanmar POSCO C&C Company, Limited. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Foreign [member] | POSCO INTERNATIONAL GLOBAL DEVELOPMENT PTE. LTD. (Formerly, Daewoo Global Development Pte., Ltd.) [member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate development  
Ownership (%) 75.00% 75.00%
Region Singapore  
Foreign [member] | POSCO INTERNATIONAL GLOBAL DEVELOPMENT PTE. LTD. (Formerly, Daewoo Global Development Pte., Ltd.) [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 75.00% 75.00%
Foreign [member] | POSCO DX VIETNAM [Member]    
Disclosure of subsidiaries [line items]    
Principal operations IT service and electric control engineering  
Ownership (%) 100.00% 100.00%
Region Vietnam  
Foreign [member] | POSCO DX VIETNAM [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Engineering and Construction India Private Limited [member]    
Disclosure of subsidiaries [line items]    
Principal operations Civil engineering and construction  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO Engineering and Construction India Private Limited [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POS-Minerals Corporation [member]    
Disclosure of subsidiaries [line items]    
Principal operations Mine development management and sales  
Ownership (%) 100.00% 100.00%
Region USA  
Foreign [member] | POS-Minerals Corporation [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO(Wuhu) Automotive Processing Center Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO(Wuhu) Automotive Processing Center Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 68.57% 68.57%
Foreign [member] | POSCO(Wuhu) Automotive Processing Center Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 31.43% 31.43%
Foreign [member] | POSCO COATED STEEL (THAILAND) CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Vehicle steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Thailand  
Foreign [member] | POSCO COATED STEEL (THAILAND) CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL AMARA Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate development  
Ownership (%) 85.00% 85.00%
Region Myanmar  
Foreign [member] | POSCO INTERNATIONAL AMARA Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 85.00% 85.00%
Foreign [member] | POSCO-Mexico Villagran Wire-rod Processing Center [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 66.75% 66.75%
Region Mexico  
Foreign [member] | POSCO-Mexico Villagran Wire-rod Processing Center [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 66.75% 66.75%
Foreign [member] | POSCO (Suzhou) Steel Processing Center CO., LTD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 0.00% 100.00%
Region —  
Foreign [member] | POSCO (Suzhou) Steel Processing Center CO., LTD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Foreign [member] | POSCO E&C SMART S DE RL DE CV [member]    
Disclosure of subsidiaries [line items]    
Principal operations Civil engineering and construction  
Ownership (%) 100.00% 100.00%
Region Mexico  
Foreign [member] | POSCO E&C SMART S DE RL DE CV [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Philippine Manila Processing Center, Inc. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Philippines  
Foreign [member] | POSCO Philippine Manila Processing Center, Inc. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO E&C HOLDINGS CO., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Holding company  
Ownership (%) 100.00% 100.00%
Region Thailand  
Foreign [member] | POSCO E&C HOLDINGS CO., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT.KRAKATAU POSCO SOCIAL ENTERPRISE SERVICES INDONESIA [member]    
Disclosure of subsidiaries [line items]    
Principal operations Social enterprise  
Ownership (%) 99.91% 99.91%
Region Indonesia  
Foreign [member] | PT.KRAKATAU POSCO SOCIAL ENTERPRISE SERVICES INDONESIA [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 99.91% 99.91%
Foreign [member] | Ventanas Philippines Construction Inc [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction  
Ownership (%) 100.00% 100.00%
Region Philippines  
Foreign [member] | Ventanas Philippines Construction Inc [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | SANPU TRADING Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Raw material trading  
Ownership (%) 0.00% 70.04%
Region —  
Foreign [member] | SANPU TRADING Co., Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 70.04%
Foreign [member] | Zhangjiagang BLZ Pohang International Trading [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel Intermediate trade  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | Zhangjiagang BLZ Pohang International Trading [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO RU Limited Liability Company [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trade and business development  
Ownership (%) 100.00% 100.00%
Region Russia  
Foreign [member] | POSCO RU Limited Liability Company [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | GOLDEN LACE POSCO INTERNATIONAL CO., LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Rice processing  
Ownership (%) 60.00% 60.00%
Region Myanmar  
Foreign [member] | GOLDEN LACE POSCO INTERNATIONAL CO., LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Foreign [member] | POSCO DX China CO., LTD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations IT service and DVR business  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO DX China CO., LTD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Pos-Sea Pte Ltd [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel Intermediate trade  
Ownership (%) 100.00% 100.00%
Region Singapore  
Foreign [member] | Pos-Sea Pte Ltd [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Europe Steel Distribution Center [member]    
Disclosure of subsidiaries [line items]    
Principal operations Logistics & Steel sales  
Ownership (%) 90.00% 90.00%
Region Slovenia  
Foreign [member] | POSCO Europe Steel Distribution Center [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 90.00% 90.00%
Foreign [member] | POSCO ENGINEERING (THAILAND) CO., LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction and engineering service  
Ownership (%) 100.00% 100.00%
Region Thailand  
Foreign [member] | POSCO ENGINEERING (THAILAND) CO., LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO VST Co., Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Stainless steel sheet manufacturing and sales  
Ownership (%) 95.65% 95.65%
Region Vietnam  
Foreign [member] | POSCO VST Co., Ltd. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 95.65% 95.65%
Foreign [member] | POSCO INTERNATIONAL UKRAINE, LLC. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Grain sales  
Ownership (%) 100.00% 100.00%
Region Ukraine  
Foreign [member] | POSCO INTERNATIONAL UKRAINE, LLC. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Zhangjiagang Pohang Refractories Co., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Refractory materials sales & furnace maintenance  
Ownership (%) 51.00% 51.00%
Region China  
Foreign [member] | Zhangjiagang Pohang Refractories Co., Ltd. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 51.00% 51.00%
Foreign [member] | POSCO Maharashtra Steel Private Limited [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO Maharashtra Steel Private Limited [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   0.00%
Foreign [member] | POSCO Maharashtra Steel Private Limited [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INDIA PROCESSING CENTER PRIVATE LIMITED [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 95.32% 95.32%
Region India  
Foreign [member] | POSCO INDIA PROCESSING CENTER PRIVATE LIMITED [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   0.00%
Foreign [member] | POSCO INDIA PROCESSING CENTER PRIVATE LIMITED [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 95.32% 95.32%
Foreign [member] | POSCO TNPC Otomotiv Celik San. Ve Tic. A.S [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Turkiye  
Foreign [member] | POSCO TNPC Otomotiv Celik San. Ve Tic. A.S [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Vietnam Processing Center Joint Stock Company [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region Vietnam  
Foreign [member] | POSCO Vietnam Processing Center Joint Stock Company [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 84.04% 84.04%
Foreign [member] | POSCO Vietnam Processing Center Joint Stock Company [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 15.96% 15.96%
Foreign [member] | POSCO (Liaoning) Automotive Processing Center Co., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO (Liaoning) Automotive Processing Center Co., Ltd. [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 90.00% 90.00%
Foreign [member] | POSCO (Liaoning) Automotive Processing Center Co., Ltd. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 10.00% 10.00%
Foreign [member] | POSCO-Indonesia Jakarta Processing Center [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 92.20% 92.20%
Region Indonesia  
Foreign [member] | POSCO-Indonesia Jakarta Processing Center [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 92.20% 92.20%
Foreign [member] | POSCO TMC INDIA PRIVATE LIMITED [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO TMC INDIA PRIVATE LIMITED [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT.MOTTA RESOURCES INDONESIA [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Mine development  
Ownership (%) 65.00% 65.00%
Region Indonesia  
Foreign [member] | PT.MOTTA RESOURCES INDONESIA [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 65.00% 65.00%
Foreign [member] | POSCO(Yantai) Automotive Processing Center Co., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO(Yantai) Automotive Processing Center Co., Ltd. [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 90.00% 90.00%
Foreign [member] | POSCO(Yantai) Automotive Processing Center Co., Ltd. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 10.00% 10.00%
Foreign [member] | POSCO AMERICA ALABAMA PROCESSING CENTER CO., LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 97.80% 97.80%
Region USA  
Foreign [member] | POSCO AMERICA ALABAMA PROCESSING CENTER CO., LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 97.80% 97.80%
Foreign [member] | POSCO India Steel Distribution Center Private Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel logistics  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO India Steel Distribution Center Private Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO YAMATO VINA STEEL JOINT STOCK COMPANY [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 51.00% 51.00%
Region Vietnam  
Foreign [member] | POSCO YAMATO VINA STEEL JOINT STOCK COMPANY [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 51.00% 51.00%
Foreign [member] | PT.POSCO DX INDONESIA [Member]    
Disclosure of subsidiaries [line items]    
Principal operations IT service and electric control engineering  
Ownership (%) 66.99% 66.99%
Region Indonesia  
Foreign [member] | PT.POSCO DX INDONESIA [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 66.99% 66.99%
Foreign [member] | POSCO NCR Coal Ltd. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Coal sales  
Ownership (%) 100.00% 100.00%
Region Canada  
Foreign [member] | POSCO NCR Coal Ltd. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO WA PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Iron ore sales & mine development  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POSCO WA PTY LTD [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO AUSTRALIA GP PTY LIMITED [member]    
Disclosure of subsidiaries [line items]    
Principal operations Resource development  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POSCO AUSTRALIA GP PTY LIMITED [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT. KRAKATAU POSCO ENERGY [member]    
Disclosure of subsidiaries [line items]    
Principal operations Electricity production construction and operation  
Ownership (%) 55.00% 55.00%
Region Indonesia  
Foreign [member] | PT. KRAKATAU POSCO ENERGY [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 55.00% 55.00%
Foreign [member] | POSCO INTERNATIONAL AMERICA CORP. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region USA  
Foreign [member] | POSCO INTERNATIONAL AMERICA CORP. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL Deutschland GMBH [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Germany  
Foreign [member] | POSCO INTERNATIONAL Deutschland GMBH [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL JAPAN CORP [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Japan  
Foreign [member] | POSCO INTERNATIONAL JAPAN CORP [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL SINGAPORE PTE. LTD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Singapore  
Foreign [member] | POSCO INTERNATIONAL SINGAPORE PTE. LTD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL ITALIA S.R.L. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Italy  
Foreign [member] | POSCO INTERNATIONAL ITALIA S.R.L. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL (CHINA) CO., LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO INTERNATIONAL (CHINA) CO., LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL TEXTILE LLC. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Textile manufacturing  
Ownership (%) 100.00% 100.00%
Region Uzbekistan  
Foreign [member] | POSCO INTERNATIONAL TEXTILE LLC. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL AUSTRALIA HOLDINGS PTY. LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Resource development  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POSCO INTERNATIONAL AUSTRALIA HOLDINGS PTY. LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO MAURITIUS LIMITED [member]    
Disclosure of subsidiaries [line items]    
Principal operations Coal development and sales  
Ownership (%) 100.00% 100.00%
Region Mauritius  
Foreign [member] | POSCO MAURITIUS LIMITED [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT. KRAKATAU POSCO [member]    
Disclosure of subsidiaries [line items]    
Principal operations [1] Steel manufacturing and sales  
Ownership (%) [1] 50.00% 50.00%
Region [1] Indonesia  
Foreign [member] | PT. KRAKATAU POSCO [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [1] 50.00% 50.00%
Foreign [member] | POSCO INTERNATIONAL MEXICO, S.A de C.V.. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Mexico  
Foreign [member] | POSCO INTERNATIONAL MEXICO, S.A de C.V.. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL MALAYSIA SDN BHD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region Malaysia  
Foreign [member] | POSCO INTERNATIONAL MALAYSIA SDN BHD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT.POSCO INDONESIA INTI [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Consulting  
Ownership (%) 100.00% 100.00%
Region Indonesia  
Foreign [member] | PT.POSCO INDONESIA INTI [Member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL SHANGHAI CO., LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO INTERNATIONAL SHANGHAI CO., LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL INDIA PVT., LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 100.00% 100.00%
Region India  
Foreign [member] | POSCO INTERNATIONAL INDIA PVT., LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | HUME COAL PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Raw material manufacturing  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | HUME COAL PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT. POSCO E&C INDONESIA [member]    
Disclosure of subsidiaries [line items]    
Principal operations Civil engineering and construction  
Ownership (%) 100.00% 100.00%
Region Indonesia  
Foreign [member] | PT. POSCO E&C INDONESIA [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Brazil Sao Paulo Steel Processing Center [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 76.00% 76.00%
Region Brazil  
Foreign [member] | Brazil Sao Paulo Steel Processing Center [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 76.00% 76.00%
Foreign [member] | POSCO ASSAN TST STEEL INDUSTRY [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 70.00% 70.00%
Region Turkiye  
Foreign [member] | POSCO ASSAN TST STEEL INDUSTRY [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%)   0.00%
Foreign [member] | POSCO ASSAN TST STEEL INDUSTRY [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Foreign [member] | POSCO ENGINEERING & CONSTRUCTION DO BRAZIL LTDA. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction  
Ownership (%) 0.00% 100.00%
Region —  
Foreign [member] | POSCO ENGINEERING & CONSTRUCTION DO BRAZIL LTDA. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 0.00% 100.00%
Foreign [member] | HONG KONG POSCO E&C (CHINA) INVESTMENT Co., Ltd [member]    
Disclosure of subsidiaries [line items]    
Principal operations Real estate development and investment  
Ownership (%) 100.00% 100.00%
Region Hongkong  
Foreign [member] | HONG KONG POSCO E&C (CHINA) INVESTMENT Co., Ltd [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | JB CLARK HILLS [member]    
Disclosure of subsidiaries [line items]    
Principal operations Apartment construction  
Ownership (%) 70.00% 70.00%
Region Philippines  
Foreign [member] | JB CLARK HILLS [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 70.00% 70.00%
Foreign [member] | ZHEJIANG POSCO-HUAYOU ESM CO., LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Anode material manufacturing  
Ownership (%) 60.00% 60.00%
Region China  
Foreign [member] | ZHEJIANG POSCO-HUAYOU ESM CO., LTD [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 14.67% 14.67%
Foreign [member] | ZHEJIANG POSCO-HUAYOU ESM CO., LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 45.33% 45.33%
Foreign [member] | POS-LT PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations Lithium mining investment  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | POS-LT PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO Argentina S.A.U. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Mineral exploration/manufacturing/sales  
Ownership (%) 100.00% 100.00%
Region Argentina  
Foreign [member] | POSCO Argentina S.A.U. [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | GRAIN TERMINAL HOLDING PTE. LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trading business  
Ownership (%) 75.00% 75.00%
Region Singapore  
Foreign [member] | GRAIN TERMINAL HOLDING PTE. LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 75.00% 75.00%
Foreign [member] | Mykolaiv Milling Works PJSC. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Grain trading  
Ownership (%) 100.00% 100.00%
Region Ukraine  
Foreign [member] | Mykolaiv Milling Works PJSC. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Yuzhnaya Stevedoring Company Limited LLC. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Cargo handling  
Ownership (%) 100.00% 100.00%
Region Ukraine  
Foreign [member] | Yuzhnaya Stevedoring Company Limited LLC. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Posco International (Thailand) Co., Ltd. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trade  
Ownership (%) 100.00% 100.00%
Region Thailand  
Foreign [member] | Posco International (Thailand) Co., Ltd. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PEC POWERCON SDN. BHD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Construction and engineering service  
Ownership (%) 100.00% 100.00%
Region Malaysia  
Foreign [member] | PEC POWERCON SDN. BHD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Poland Legnica Sourcing Center Sp. z o.o [member]    
Disclosure of subsidiaries [line items]    
Principal operations Non-ferrous metal Smetling  
Ownership (%) 100.00% 100.00%
Region Poland  
Foreign [member] | Poland Legnica Sourcing Center Sp. z o.o [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT POSCO INTERNATIONAL INDONESIA [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Trade  
Ownership (%) 100.00% 100.00%
Region Indonesia  
Foreign [member] | PT POSCO INTERNATIONAL INDONESIA [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL E&P MALAYSIA SDN. BHD. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Extraction of Crude petroleum and Natural gas  
Ownership (%) 100.00% 100.00%
Region Malaysia  
Foreign [member] | POSCO INTERNATIONAL E&P MALAYSIA SDN. BHD. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | AGPA PTE. LTD. [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Holding company  
Ownership (%) 100.00% 100.00%
Region Singapore  
Foreign [member] | AGPA PTE. LTD. [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Senex Holdings PTY LTD [member]    
Disclosure of subsidiaries [line items]    
Principal operations [2] Resource Development  
Ownership (%) [2] 50.10% 50.10%
Region [2] Australia  
Foreign [member] | Senex Holdings PTY LTD [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [2] 50.10% 50.10%
Foreign [member] | ULTIUM CAM GP INC. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Holding company  
Ownership (%) 85.00% 85.00%
Region Canada  
Foreign [member] | ULTIUM CAM GP INC. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 85.00% 85.00%
Foreign [member] | Posco International Mexico e-Mobility S.A DE C.V. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Electric Vehicle Parts Manufacturing  
Ownership (%) 100.00% 100.00%
Region Mexico  
Foreign [member] | Posco International Mexico e-Mobility S.A DE C.V. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Posco Future Materials Canada Inc [member]    
Disclosure of subsidiaries [line items]    
Principal operations Holding company  
Ownership (%) 100.00% 100.00%
Region Canada  
Foreign [member] | Posco Future Materials Canada Inc [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | ULTIUM CAM LIMITED PARTNERSHIP [member]    
Disclosure of subsidiaries [line items]    
Principal operations Anode material manufacturing  
Ownership (%) 85.00% 85.00%
Region Canada  
Foreign [member] | ULTIUM CAM LIMITED PARTNERSHIP [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 85.00% 85.00%
Foreign [member] | POSCO(Wuhan) Automotive Processing Center Co.,Ltd [member]    
Disclosure of subsidiaries [line items]    
Principal operations Steel manufacturing and sales  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO(Wuhan) Automotive Processing Center Co.,Ltd [member] | POSCO HOLDINGS INC. [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 68.57% 68.57%
Foreign [member] | POSCO(Wuhan) Automotive Processing Center Co.,Ltd [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 31.43% 31.43%
Foreign [member] | POSCO BRAZIL LTDA [member]    
Disclosure of subsidiaries [line items]    
Principal operations Office Administration, Management Consulting  
Ownership (%) 100.00% 100.00%
Region Brazil  
Foreign [member] | POSCO BRAZIL LTDA [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | Port Hedland Green Steel Pty Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Iron and steel manufacturing  
Ownership (%) 100.00% 100.00%
Region Australia  
Foreign [member] | Port Hedland Green Steel Pty Ltd [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT AGPA REFINERY COMPLEX [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Animal/vegetable oil manufacturing  
Ownership (%) 60.00% 60.00%
Region Indonesia  
Foreign [member] | PT AGPA REFINERY COMPLEX [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 60.00% 60.00%
Foreign [member] | POSCO MOBILITY SOLUTION POLAND Sp. z o.o., [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Manufacturing, automobile motor parts  
Ownership (%) 100.00% 100.00%
Region Poland  
Foreign [member] | POSCO MOBILITY SOLUTION POLAND Sp. z o.o., [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | PT POSCO INTERNATIONAL ENP INDONESIA [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Crude oil and natural gas  
Ownership (%) 100.00% 100.00%
Region Indonesia  
Foreign [member] | PT POSCO INTERNATIONAL ENP INDONESIA [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO INTERNATIONAL E&P USA Inc. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Carbon capture and storage, resource development  
Ownership (%) 100.00% 100.00%
Region USA  
Foreign [member] | POSCO INTERNATIONAL E&P USA Inc. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO FLOW CANADA INC. [member]    
Disclosure of subsidiaries [line items]    
Principal operations Transporting and warehousing  
Ownership (%) 100.00% 100.00%
Region Canada  
Foreign [member] | POSCO FLOW CANADA INC. [member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO FLOW (Shanghai) Co.,Ltd [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Transporting  
Ownership (%) 100.00% 100.00%
Region China  
Foreign [member] | POSCO FLOW (Shanghai) Co.,Ltd [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00% 100.00%
Foreign [member] | POSCO (BEIJING) Trading Co., Ltd.    
Disclosure of subsidiaries [line items]    
Principal operations Trade  
Ownership (%) 100.00%  
Region China  
Foreign [member] | POSCO (BEIJING) Trading Co., Ltd. | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Foreign [member] | PT Prime Agri Resources [Member]    
Disclosure of subsidiaries [line items]    
Principal operations [3] Food resources development  
Ownership (%) [3] 65.72%  
Region [3] Indonesia  
Foreign [member] | PT Prime Agri Resources [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) [3] 65.72%  
Foreign [member] | POSCO FLOW VIETNAM CO LTD [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Logistics  
Ownership (%) 100.00%  
Region Vietnam  
Foreign [member] | POSCO FLOW VIETNAM CO LTD [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
Foreign [member] | POSCO INTERNATIONAL ALASKA ENERGY LLC [Member]    
Disclosure of subsidiaries [line items]    
Principal operations Energy  
Ownership (%) 100.00%  
Region USA  
Foreign [member] | POSCO INTERNATIONAL ALASKA ENERGY LLC [Member] | Total for all subsidiaries [member]    
Disclosure of subsidiaries [line items]    
Ownership (%) 100.00%  
[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] Senex Holdings PTY LTD includes 21 subsidiaries including Senex Energy Limited.
[3] PT. Prime Agri Resources includes 25 subsidiaries including PT. Prime Agri Resources.