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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.

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