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Investments in Associates and Joint Ventures - Summarized Financial Information of Associates and Joint Ventures (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of investments in associates and joint ventures [Line Items]        
Assets ₩ 105,287,678 ₩ 103,443,735    
Liabilities 42,894,966 42,000,967    
Equity 62,392,712 61,442,768 ₩ 59,598,600 ₩ 58,191,897
Sales 68,986,938 73,459,408 77,056,549  
Net income (loss) 527,023 1,005,276 ₩ 1,846,059  
Domestic [member] | Samcheok Blue Power Co.,Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 5,186,881 4,770,385    
Liabilities 4,361,206 4,013,505    
Equity 825,675 756,880    
Sales 638,593 596,497    
Net income (loss) 23,070 177,922    
Domestic [member] | SNNC [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 553,862 656,049    
Liabilities 531,702 560,530    
Equity 22,160 95,519    
Sales 767,857 690,103    
Net income (loss) (73,652) (127,233)    
Domestic [member] | Chun-cheon Energy Co., Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 505,987 540,333    
Liabilities 382,416 417,139    
Equity 123,571 123,194    
Sales 363,995 430,679    
Net income (loss) 377 5,089    
Domestic [member] | Pocheon-Hwado Highway Corp. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 683,282 690,646    
Liabilities 584,471 599,199    
Equity 98,811 91,447    
Sales 24,289 21,920    
Net income (loss) 7,364 (29,582)    
Domestic [member] | CHUNGJU ENTERPRISE CITY DEVELOPMENT Co.,Ltd        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 13,340 14,663    
Liabilities 2,694 2,968    
Equity 10,646 11,695    
Sales 1,050      
Net income (loss) (1,049) (1,302)    
Domestic [member] | PCC Amberstone Private Equity Fund 1 [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 33,795 72,722    
Liabilities 2,067 2,455    
Equity 31,728 70,267    
Sales 891 7    
Net income (loss) (5,329) (5,508)    
Domestic [member] | POSCO MC MATERIALS [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 349,737 385,270    
Liabilities 104,830 127,335    
Equity 244,907 257,935    
Sales 205,386 226,376    
Net income (loss) (8,479) 1,217    
Foreign [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets [1]   1,030,657    
Liabilities [1]   72,827    
Equity [1]   957,831    
Sales [1]   147,136    
Net income (loss) [1]   80,352    
Foreign [member] | Roy Hill Holdings Pty Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 11,118,720 10,460,434    
Liabilities 2,625,843 2,356,265    
Equity 8,492,877 8,104,169    
Sales 7,209,853 7,179,077    
Net income (loss) 1,641,837 2,038,555    
Foreign [member] | POSCO-NPS Niobium LLC [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 932,780 955,592    
Equity 932,780 955,592    
Net income (loss) 79,937 57,722    
Foreign [member] | KOBRASCO [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 276,085 282,087    
Liabilities 22,804 43,052    
Equity 253,281 239,035    
Sales 54,101 118,408    
Net income (loss) 35,522 74,690    
Foreign [member] | BX STEEL POSCO Cold Rolled Sheet Co., Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 1,272,968 1,180,532    
Liabilities 769,371 699,775    
Equity 503,597 480,757    
Sales 1,455,502 1,595,656    
Net income (loss) 61,595 56,830    
Foreign [member] | DMSA/AMSA [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 875,900 3,364,786    
Liabilities 1,692,942 3,468,220    
Equity (817,042) (103,434)    
Sales 856,215 694,120    
Net income (loss) (684,937) (571,215)    
Foreign [member] | HBIS-POSCO Automotive Steel Co.,Ltd        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 964,614 1,024,831    
Liabilities 679,930 645,671    
Equity 284,684 379,160    
Sales 625,983 518,808    
Net income (loss) (97,928) (90,757)    
Foreign [member] | PT NICOLE METAL INDUSTRY [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 1,073,184 818,168    
Liabilities 172,335 25,039    
Equity 900,849 793,129    
Sales 701,059      
Net income (loss) 40,197 (644)    
Foreign [member] | M RES NSW HCC II Pty Ltd [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 109,139      
Liabilities 3      
Equity 109,136      
Net income (loss) (2,761)      
Foreign [member] | South-East Asia Gas Pipeline Company Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 1,445,230 1,634,345    
Liabilities 393,409 518,743    
Equity 1,051,821 1,115,602    
Sales 462,017 409,790    
Net income (loss) 229,086 183,392    
Foreign [member] | AES Mong Duong Power Company Limited [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets   1,758,256    
Liabilities   922,268    
Equity   835,988    
Sales   460,672    
Net income (loss)   118,071    
Foreign [member] | 9404-5515 Quebec Inc. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 1,631,812 1,704,653    
Liabilities 21      
Equity 1,631,791 1,704,653    
Net income (loss) 47,813 136,320    
Foreign [member] | FQM Australia Holdings Pty Ltd [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 57,067 61,735    
Liabilities 1,579,336 1,521,991    
Equity (1,522,269) (1,460,256)    
Sales 0 102,869    
Net income (loss) (96,001) (396,146)    
Foreign [member] | KOREA LNG LTD. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 97,944 128,215    
Liabilities 325 102    
Equity 97,619 128,113    
Sales 28,117 90,578    
Net income (loss) 25,960 88,572    
Foreign [member] | Nickel mining company SAS [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 491,050 519,560    
Liabilities 303,284 282,321    
Equity 187,766 237,239    
Sales 187,021 237,102    
Net income (loss) (70,342) (27,170)    
Foreign [member] | Zhejiang Huayou Posco Esm Co Ltd [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 340,488 325,284    
Liabilities 71,616 39,058    
Equity 268,872 286,226    
Sales 187,600 82,254    
Net income (loss) (21,282) (7,139)    
Foreign [member] | PT. Wampu Electric Power [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 190,896 209,725    
Liabilities 111,514 124,359    
Equity 79,382 85,366    
Sales 19,108 19,133    
Net income (loss) 3,693 6,191    
Foreign [member] | POS-SeAH Steel Wire(Nantong) Co., Ltd. [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Assets 99,974 98,919    
Liabilities 55,384 58,972    
Equity 44,590 39,947    
Sales 151,451 139,499    
Net income (loss) ₩ 3,814 ₩ 2,145    
[1] Summarized financial information of POSCO AUSTRALIA PTY LTD, PT. KRAKATAU POSCO and Senex Holdings PTY LTD, a subsidiary of POSCO HOLDINGS INC., are based on its consolidated financial information. The financial information of the other entities is based on separate financial statements of each entity.