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General Information - Details of Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [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
Revenue 68,986,938 73,459,408 77,056,549  
Profit (loss) 527,023 1,005,276 1,846,059  
POSCO DX Co., Ltd [Member]        
Disclosure of subsidiaries [line items]        
Equity 572,561 525,898 461,450  
Revenue 1,075,175 1,473,291 1,485,876  
Profit (loss) 52,624 88,599 92,128  
POSCO AUSTRALIA PTY LTD [member]        
Disclosure of subsidiaries [line items]        
Assets 1,302,758   1,322,381 [1]  
Liabilities 126,704   133,612 [1]  
Equity 1,176,054   1,188,769 [1]  
Revenue 120,629   224,985 [1]  
Profit (loss) 54,161   152,896 [1]  
POSCO-CTPC Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Assets 93,444      
Liabilities 30,522      
Equity 62,922      
Revenue 193,651      
Profit (loss) 1,137      
Domestic [member] | POSCO [Member]        
Disclosure of subsidiaries [line items]        
Assets 45,022,297 45,681,401 45,825,529  
Liabilities 11,113,310 12,574,873 12,716,600  
Equity 33,908,987 33,106,528 33,108,929  
Revenue 35,010,837 37,556,523 38,971,567  
Profit (loss) 1,187,860 901,542 1,179,665  
Domestic [member] | POSCO Eco & Challenge Co., Ltd.        
Disclosure of subsidiaries [line items]        
Assets 8,172,206 7,409,590 8,402,626  
Liabilities 5,276,507 3,987,205 5,061,423  
Equity 2,895,699 3,422,385 3,341,203  
Revenue 6,591,563 9,933,169 9,463,944  
Profit (loss) (517,983) 93,873 198,412  
Domestic [member] | POSCO DX Co., Ltd [Member]        
Disclosure of subsidiaries [line items]        
Assets 814,795 871,043 871,343  
Liabilities 253,134 356,499 418,446  
Equity 561,661 514,543 452,897  
Revenue 1,046,633 1,440,386 1,445,326  
Profit (loss) 52,384 86,759 88,527  
Domestic [member] | eNtoB Corporation [member]        
Disclosure of subsidiaries [line items]        
Assets 163,126 186,221 164,228  
Liabilities 90,342 116,120 97,127  
Equity 72,784 70,101 67,101  
Revenue 995,642 1,018,894 1,110,222  
Profit (loss) 4,404 4,683 8,491  
Domestic [member] | POSCO FUTURE M CO.,LTD. and others [Member]        
Disclosure of subsidiaries [line items]        
Assets 7,828,096 6,765,713 5,756,556  
Liabilities 3,927,339 3,980,328 3,327,874  
Equity 3,900,757 2,785,385 2,428,682  
Revenue 2,689,403 3,608,988 4,457,201  
Profit (loss) 31,815 (222,038) 32,140  
Domestic [member] | POSCO M-TECH [member]        
Disclosure of subsidiaries [line items]        
Assets 155,483 149,758 154,927  
Liabilities 41,231 37,945 39,170  
Equity 114,252 111,813 115,757  
Revenue 357,432 346,628 341,410  
Profit (loss) 1,411 568 4,868  
Domestic [member] | POSCO STEELEON Co., Ltd. [Member]        
Disclosure of subsidiaries [line items]        
Assets 479,864 530,860 529,525  
Liabilities 105,249 154,751 174,724  
Equity 374,615 376,108 354,801  
Revenue 1,093,989 1,175,769 1,132,510  
Profit (loss) 14,436 32,358 32,276  
Domestic [member] | POSCO INTERNATIONAL Corporation [member]        
Disclosure of subsidiaries [line items]        
Assets 13,725,392 12,692,301 12,565,027  
Liabilities 7,931,430 6,981,884 7,170,143  
Equity 5,793,962 5,710,417 5,394,884  
Revenue 26,956,598 27,388,739 28,536,917  
Profit (loss) 513,830 510,930 632,519  
Domestic [member] | POSCO MOBILITY SOLUTION [Member]        
Disclosure of subsidiaries [line items]        
Assets 930,712 957,411 1,036,342  
Liabilities 376,195 406,888 448,319  
Equity 554,517 550,523 588,023  
Revenue 1,182,165 1,179,247 1,432,416  
Profit (loss) 2,104 (35,088) (24,265)  
Domestic [member] | POSCO Pilbara LITHIUM SOLUTION CO Ltd [Member]        
Disclosure of subsidiaries [line items]        
Assets 1,199,943 1,254,635 898,301  
Liabilities 824,709 1,038,612 558,449  
Equity 375,234 216,023 339,852  
Revenue 151,666 30,237 4,673  
Profit (loss) (241,325) (122,852) (34,198)  
Domestic [member] | QSONE Co.,Ltd. [member]        
Disclosure of subsidiaries [line items]        
Assets 233,225 232,238 232,848 [2]  
Liabilities 35,538 44,188 53,646 [2]  
Equity 197,687 188,050 179,202 [2]  
Revenue 23,883 23,087 18,044 [2]  
Profit (loss) 9,637 8,852 6,037 [2]  
Foreign [member]        
Disclosure of subsidiaries [line items]        
Assets [3]   1,030,657    
Liabilities [3]   72,827    
Equity [3]   957,831    
Revenue [3]   147,136    
Profit (loss) [3]   80,352    
Foreign [member] | POSCO INTERNATIONAL Corporation [member]        
Disclosure of subsidiaries [line items]        
Assets     306,105  
Liabilities     400,124  
Equity     (94,019)  
Revenue     33,288  
Profit (loss)     (21,723)  
Foreign [member] | POSCO America Corporation [member]        
Disclosure of subsidiaries [line items]        
Assets 177,414 182,232 153,900  
Liabilities 7,388 8,496 7,980  
Equity 170,026 173,737 145,920  
Revenue 12,387 13,260 12,231  
Profit (loss) 1,103 6,839 16,690  
Foreign [member] | POSCO Asia Co Ltd [member]        
Disclosure of subsidiaries [line items]        
Assets 1,070,584 917,019 1,130,637  
Liabilities 767,290 621,154 862,642  
Equity 303,294 295,864 267,995  
Revenue 33,285 64,318 83,539  
Profit (loss) 14,276 (8,867) 16,275  
Foreign [member] | POSCO-CTPC Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Assets   108,172 113,805  
Liabilities   47,479 59,166  
Equity   60,692 54,639  
Revenue   264,923 250,167  
Profit (loss)   0 1,093  
Foreign [member] | POSCO (Zhangjiagang) Stainless Steel Co.,Ltd [Member]        
Disclosure of subsidiaries [line items]        
Assets 1,017,825 1,047,884 936,933  
Liabilities 828,674 654,532 459,269  
Equity 189,151 393,352 477,664  
Revenue 2,459,184 3,042,140 3,359,087  
Profit (loss) (203,736) (129,933) (169,873)  
Foreign [member] | POSCO (Thailand) Company Limited [member]        
Disclosure of subsidiaries [line items]        
Assets 181,303 197,326 185,280  
Liabilities 51,750 77,129 82,456  
Equity 129,553 120,197 102,824  
Revenue 460,933 407,074 440,532  
Profit (loss) 2,683 2,400 (3,621)  
Foreign [member] | Qingdao Pohang Stainless Steel Co, Ltd [member]        
Disclosure of subsidiaries [line items]        
Assets 101,432 135,759 128,820  
Liabilities 28,485 33,597 23,453  
Equity 72,947 102,162 105,367  
Revenue 172,453 211,357 296,883  
Profit (loss) (29,916) (14,197) (13,362)  
Foreign [member] | POSCO(Suzhou) Automotive Processing Center Co, Ltd [member]        
Disclosure of subsidiaries [line items]        
Assets 367,922 441,569 371,734  
Liabilities 168,201 252,305 198,451  
Equity 199,721 189,265 173,283  
Revenue 697,007 783,814 729,700  
Profit (loss) 6,927 (2,773) 6,364  
Foreign [member] | POSCO-China Holding Corp. [member]        
Disclosure of subsidiaries [line items]        
Assets 899,827 1,018,689 986,501  
Liabilities 394,606 512,006 515,610  
Equity 505,221 506,683 470,891  
Revenue 26,683 20,500 31,329  
Profit (loss) (9,895) (17,866) (22,326)  
Foreign [member] | POSCO JAPAN Co, Ltd [member]        
Disclosure of subsidiaries [line items]        
Assets 464,652 212,669 201,184  
Liabilities 259,140 8,031 5,300  
Equity 205,512 204,638 195,884  
Revenue 332,192 15,989 16,453  
Profit (loss) 3,042 2,985 3,705  
Foreign [member] | POSCO-lndia Pune Processing Center. Pvt. Ltd.        
Disclosure of subsidiaries [line items]        
Assets 219,226 209,999 222,439  
Liabilities 156,960 156,856 175,594  
Equity 62,266 53,144 46,845  
Revenue 561,938 483,584 436,248  
Profit (loss) 13,138 1,129 1,576  
Foreign [member] | POSCO Japan PC CO., LTD [member]        
Disclosure of subsidiaries [line items]        
Assets 282,106 352,915 335,780  
Liabilities 186,496 262,886 254,557  
Equity 95,610 90,028 81,223  
Revenue 601,268 615,346 623,375  
Profit (loss) 7,662 6,430 9,079  
Foreign [member] | POSCO-CFPC Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Assets 208,779 331,811 296,489  
Liabilities 138,537 257,870 229,961  
Equity 70,242 73,941 66,528  
Revenue 751,210 980,637 843,934  
Profit (loss) (4,810) (96) 1,900  
Foreign [member] | POSCO MPPC S.A. de C.V. [member]        
Disclosure of subsidiaries [line items]        
Assets 540,502 661,110 521,303  
Liabilities 432,030 536,852 415,819  
Equity 108,472 124,258 105,484  
Revenue 990,082 1,008,224 934,346  
Profit (loss) (12,703) 3,709 (278)  
Foreign [member] | POSCO-VIETNAM Co, Ltd [member]        
Disclosure of subsidiaries [line items]        
Assets 297,547 350,524 309,476  
Liabilities 287,963 337,418 299,054  
Equity 9,584 13,106 10,422  
Revenue 800,445 835,631 737,530  
Profit (loss) (3,180) 1,136 (5,594)  
Foreign [member] | POSCO MEXICO S.A. DE C.V. [member]        
Disclosure of subsidiaries [line items]        
Assets 516,173 749,960 726,121  
Liabilities 267,912 475,331 500,597  
Equity 248,261 274,629 225,524  
Revenue 779,354 999,807 846,600  
Profit (loss) (19,631) 16,243 (8,530)  
Foreign [member] | POSCO Thainox Public Company Limited [member]        
Disclosure of subsidiaries [line items]        
Assets 513,813 512,321 433,638  
Liabilities 103,715 115,149 100,506  
Equity 410,098 397,172 333,132  
Revenue 595,928 576,912 551,000  
Profit (loss) (2,639) 14,948 (4,170)  
Foreign [member] | POSCO Center Beijing [member]        
Disclosure of subsidiaries [line items]        
Assets 429,839 457,044 427,898  
Liabilities 225,133 253,675 246,190  
Equity 204,706 203,369 181,708  
Revenue 29,728 32,514 37,028  
Profit (loss) (2,114) 1,065 5,623  
Foreign [member] | POSCO COATED STEEL (THAILAND) CO, LTD [member]        
Disclosure of subsidiaries [line items]        
Assets 323,171 324,391 307,619  
Liabilities 210,452 228,055 220,259  
Equity 112,719 96,336 87,360  
Revenue 447,580 402,981 386,992  
Profit (loss) 9,970 (3,165) 1,459  
Foreign [member] | POSCO INTERNATIONAL AMARA Co Ltd [Member]        
Disclosure of subsidiaries [line items]        
Assets 312,345 322,963 629,533  
Liabilities 486,621 479,031 473,572  
Equity (174,276) (156,068) 155,961  
Revenue 53,994 43,629 2,282,133  
Profit (loss) (21,735) (45,325) 29,445  
Foreign [member] | POSCO VST CO LTD [Member]        
Disclosure of subsidiaries [line items]        
Assets 307,026 304,235 251,525  
Liabilities 242,985 224,360 196,382  
Equity 64,041 79,875 55,143  
Revenue 588,177 510,914 547,889  
Profit (loss) (13,800) 15,771 (36,723)  
Foreign [member] | POSCO Maharashtra Steel Private Limited [member]        
Disclosure of subsidiaries [line items]        
Assets 1,410,778 1,471,597 1,319,232  
Liabilities 616,607 695,297 791,431  
Equity 794,171 776,300 527,801  
Revenue 1,962,507 1,785,238 1,763,374  
Profit (loss) 74,068 180,957 58,669  
Foreign [member] | POSCO INDIA PROCESSING CENTER PRIVATE LIMITED [Member]        
Disclosure of subsidiaries [line items]        
Assets 449,056 424,014 344,678  
Liabilities 328,739 310,883 251,870  
Equity 120,317 113,131 92,808  
Revenue 1,038,388 1,003,522 896,860  
Profit (loss) 15,473 9,669 13,268  
Foreign [member] | POSCO Vietnam Processing Center Co Ltd [Member]        
Disclosure of subsidiaries [line items]        
Assets     238,694  
Liabilities     127,038  
Equity     111,656  
Revenue     577,064  
Profit (loss)     7,003  
Foreign [member] | POSCO (Liaoning) Automotive Processing Center Co., Ltd. [Member]        
Disclosure of subsidiaries [line items]        
Assets 89,376 89,444 99,186  
Liabilities 29,251 31,260 48,858  
Equity 60,125 58,184 50,328  
Revenue 155,217 209,207 229,524  
Profit (loss) 1,417 2,339 3,718  
Foreign [member] | POSCO YAMATO VINA STEEL JOINT STOCK COMPANY [Member]        
Disclosure of subsidiaries [line items]        
Assets 433,768 466,488 434,496  
Liabilities 112,956 142,002 127,087  
Equity 320,812 324,486 307,409  
Revenue 391,439 423,938 395,261  
Profit (loss) 4,037 (24,091) 8,993  
Foreign [member] | PT. KRAKATAU POSCO ENERGY [member]        
Disclosure of subsidiaries [line items]        
Assets 297,226 296,566 263,986  
Liabilities 79,844 89,437 94,202  
Equity 217,382 207,130 169,784  
Revenue 36,099 34,777 34,158  
Profit (loss) 15,052 12,578 13,895  
Foreign [member] | POSCO INTERNATIONAL AMERICA CORP. [Member]        
Disclosure of subsidiaries [line items]        
Assets 678,580 726,447 400,762  
Liabilities 435,460 489,622 384,113  
Equity 243,120 236,825 16,649  
Revenue 2,803,426 2,651,352 946,974  
Profit (loss) 11,841 54,727 3,413  
Foreign [member] | POSCO INTERNATIONAL Deutschland GMBH [Member]        
Disclosure of subsidiaries [line items]        
Assets 535,776 503,928 895,043  
Liabilities 517,285 488,965 744,065  
Equity 18,491 14,963 150,978  
Revenue 1,265,871 1,099,624 2,939,318  
Profit (loss) 1,897 (2,776) 27,022  
Foreign [member] | POSCO INTERNATIONAL JAPAN CORP [Member]        
Disclosure of subsidiaries [line items]        
Assets 482,108 998,144 294,527  
Liabilities 302,412 821,148 280,090  
Equity 179,696 176,996 14,437  
Revenue 2,596,871 2,966,044 3,025,822  
Profit (loss) 6,490 21,235 7,452  
Foreign [member] | POSCO INTERNATIONAL SINGAPORE PTE LTD [Member]        
Disclosure of subsidiaries [line items]        
Assets 377,452 217,546 226,148  
Liabilities 351,911 194,011 209,374  
Equity 25,541 23,534 16,774  
Revenue 3,394,333 3,225,062 777,756  
Profit (loss) 2,545 6,560 1,498  
Foreign [member] | POSCO INTERNATIONAL ITALIA S.R.L. [Member]        
Disclosure of subsidiaries [line items]        
Assets 353,864 291,810    
Liabilities 328,875 271,429    
Equity 24,989 20,381    
Revenue 848,468 862,642    
Profit (loss) 2,395 2,321    
Foreign [member] | PT. KRAKATAU POSCO [Member]        
Disclosure of subsidiaries [line items]        
Assets 3,233,243 [3] 3,523,003 3,475,929  
Liabilities 2,656,952 [3] 2,874,800 2,747,948  
Equity 576,291 [3] 648,203 727,981  
Revenue 2,627,285 [3] 2,817,274 3,130,551  
Profit (loss) (55,749) [3] (168,700) 65,827  
Foreign [member] | POSCO ASSAN TST STEEL INDUSTRY [Member]        
Disclosure of subsidiaries [line items]        
Assets 528,879 568,566 471,071  
Liabilities 545,403 568,513 456,913  
Equity (16,524) 53 14,158  
Revenue 578,928 503,646 416,096  
Profit (loss) (16,426) (23,238) (73,032)  
Foreign [member] | POSCO AMERICA ALABAMA PROCESSING CENTER CO., LTD. [Member]        
Disclosure of subsidiaries [line items]        
Assets 141,846   152,896  
Liabilities 135,609   135,087  
Equity 6,237   17,809  
Revenue 264,484   251,884  
Profit (loss) (5,152)   (3,025)  
Foreign [member] | POSCO Argentina S.A.U. [member]        
Disclosure of subsidiaries [line items]        
Assets 3,024,213 2,786,535 1,658,879  
Liabilities 1,860,335 1,260,950 542,525  
Equity 1,163,878 1,525,585 1,116,354  
Revenue 64,359 3,203 0  
Profit (loss) (322,330) (128,649) (73,807)  
Foreign [member] | POSCO-MKPC SDN BHD [member]        
Disclosure of subsidiaries [line items]        
Assets 157,680 164,150 132,043  
Liabilities 54,285 72,783 59,916  
Equity 103,395 91,367 72,127  
Revenue 244,146 257,822 244,754  
Profit (loss) 5,895 7,271 8,770  
Foreign [member] | Senex Holdings PTY LTD [Member]        
Disclosure of subsidiaries [line items]        
Assets 2,706,285 [3] 2,269,190 [1] 1,623,493 [1]  
Liabilities 1,137,655 [3] 910,149 [1] 802,259 [1]  
Equity 1,568,630 [3] 1,359,041 [1] 821,234 [1]  
Revenue 392,218 [3] 268,350 [1] 246,493 [1]  
Profit (loss) ₩ 28,069 [3] 16,389 [1] ₩ 14,239 [1]  
Foreign [member] | POSCO AMERICA ALABAMA PROCESSING CENTER CO LTD [Member]        
Disclosure of subsidiaries [line items]        
Assets   204,257    
Liabilities   192,542    
Equity   11,715    
Revenue   347,192    
Profit (loss)   ₩ (7,963)    
[1] Summarized financial information of POSCO AUSTRALIA PTY LTD 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.
[2] The sales and net income occurred after the inclusion as a subsidiary.
[3] 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.