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Investments in Associates and Joint Ventures - Changes in Investments in Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | ₩ 4,738,793 | ₩ 5,020,264 |
Acquisition | 213,279 | 298,176 |
Dividends | (376,109) | (511,189) |
Share of profits (losses) | 349,910 | (256,458) | ₩ 269,678
Other increase (decrease) | 54,280 | 188,000 |
Book value, ending balance | 4,980,153 | 4,738,793 | 5,020,264
Domestic [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 764,354 | 792,855 |
Acquisition | 43,106 | 38,217 |
Dividends | (8,238) | (18,282) |
Share of profits (losses) | (32,147) | (22,382) |
Other increase (decrease) | (1,144) | (26,054) |
Book value, ending balance | 765,931 | 764,354 | 792,855
Domestic [member] | Samcheok Blue Power Co.,Ltd. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 392,269 | 323,521 |
Acquisition | 17,509 | 25,680 |
Dividends | (2,795) | (10,993) |
Share of profits (losses) | 7,595 | 54,140 |
Other increase (decrease) | 7,121 | (79) |
Book value, ending balance | 421,699 | 392,269 | 323,521
Domestic [member] | SNNC [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 38,046 | 100,692 |
Dividends | 0 |  |
Share of profits (losses) | (35,826) | (61,898) |
Other increase (decrease) | 144 | (748) |
Book value, ending balance | 2,364 | 38,046 | 100,692
Domestic [member] | Chun-cheon Energy Co., Ltd. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 14,054 | 15,040 |
Share of profits (losses) | 2,016 | 1,807 |
Other increase (decrease) | 615 | (2,793) |
Book value, ending balance | 16,685 | 14,054 | 15,040
Domestic [member] | Pocheon-Hwado Highway Corp. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 14,834 | 23,998 |
Share of profits (losses) | 2,360 | (9,164) |
Book value, ending balance | 17,194 | 14,834 | 23,998
Domestic [member] | CHUNGJU ENTERPRISE CITY DEVELOPMENT Co.,Ltd |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 12,401 | 13,967 |
Share of profits (losses) | (306) | (384) |
Other increase (decrease) | 1 | (1,182) |
Book value, ending balance | 12,096 | 12,401 | 13,967
Domestic [member] | PCC Amberstone Private Equity Fund 1 [Member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 6,181 | 8,904 |
Acquisition | 0 | 175 |
Dividends | (227) | (490) |
Share of profits (losses) | (469) | (484) |
Other increase (decrease) | (2,694) | (1,924) |
Book value, ending balance | 2,791 | 6,181 | 8,904
Domestic [member] | POSCO MC MATERIALS [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 153,839 | 155,748 |
Dividends | (3,000) | (1,800) |
Share of profits (losses) | (5,072) | 403 |
Other increase (decrease) | 271 | (512) |
Book value, ending balance | 146,038 | 153,839 | 155,748
Domestic [member] | Other associates and joint ventures One [Member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 132,730 | 150,985 |
Acquisition | 25,597 | 12,362 |
Dividends | (2,216) | (4,999) |
Share of profits (losses) | (2,445) | (6,802) |
Other increase (decrease) | (6,602) | (18,816) |
Book value, ending balance | 147,064 | 132,730 | 150,985
Foreign [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 3,974,439 | 4,227,409 |
Acquisition | 170,173 | 259,959 |
Dividends | (367,871) | (492,907) |
Share of profits (losses) | 382,057 | (234,076) |
Other increase (decrease) | 55,424 | 214,054 |
Book value, ending balance | 4,214,222 | 3,974,439 | 4,227,409
Foreign [member] | Roy Hill Holdings Pty Ltd. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 1,397,824 | 1,400,009 |
Dividends | (213,794) | (284,541) |
Share of profits (losses) | 161,274 | 203,130 |
Other increase (decrease) | 96,072 | 79,226 |
Book value, ending balance | 1,441,376 | 1,397,824 | 1,400,009
Foreign [member] | POSCO-NPS Niobium LLC [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 477,898 | 419,192 |
Dividends | (44,955) | (29,225) |
Share of profits (losses) | 43,229 | 29,336 |
Other increase (decrease) | (9,680) | 58,595 |
Book value, ending balance | 466,492 | 477,898 | 419,192
Foreign [member] | KOBRASCO [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 119,820 | 99,768 |
Dividends | (22,955) | (5,761) |
Share of profits (losses) | 17,761 | 37,914 |
Other increase (decrease) | 12,317 | (12,101) |
Book value, ending balance | 126,943 | 119,820 | 99,768
Foreign [member] | BX STEEL POSCO Cold Rolled Sheet Co., Ltd. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 126,906 | 111,001 |
Dividends | (11,440) | (10,772) |
Share of profits (losses) | 15,399 | 14,207 |
Other increase (decrease) | 1,751 | 12,470 |
Book value, ending balance | 132,616 | 126,906 | 111,001
Foreign [member] | DMSA/AMSA [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance |  | 16,572 |
Share of profits (losses) |  | (17,299) |
Other increase (decrease) |  | 727 |
Book value, ending balance |  |  | 16,572
Foreign [member] | PT NICOLE METAL INDUSTRY [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 578,604 | 284,351 |
Acquisition | 62,574 | 247,824 |
Share of profits (losses) | 19,497 | (315) |
Other increase (decrease) | (11,213) | 46,744 |
Book value, ending balance | 649,462 | 578,604 | 284,351
Foreign [member] | HBIS-POSCO Automotive Steel Co.,Ltd |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 179,841 | 208,765 |
Share of profits (losses) | (47,669) | (49,480) |
Other increase (decrease) | 2,232 | 20,556 |
Book value, ending balance | 134,404 | 179,841 | 208,765
Foreign [member] | M RES NSW HCC II Pty Ltd [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Acquisition | 104,511 |  |
Share of profits (losses) | (2,210) |  |
Other increase (decrease) | (417) |  |
Book value, ending balance | 101,884 |  |
Foreign [member] | South-East Asia Gas Pipeline Company Ltd. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 279,349 | 287,282 |
Dividends | (37,273) | (64,208) |
Share of profits (losses) | 57,362 | 45,923 |
Other increase (decrease) | (36,063) | 10,352 |
Book value, ending balance | 263,375 | 279,349 | 287,282
Foreign [member] | AES Mong Duong Power Company Limited [Member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance |  | 230,699 |
Dividends |  | (34,821) |
Share of profits (losses) |  | (82,075) |
Other increase (decrease) |  | (113,803) |
Book value, ending balance |  |  | 230,699
Foreign [member] | 9404-5515 Quebec Inc. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 426,276 | 346,724 |
Dividends | (21,180) | (17,764) |
Share of profits (losses) | 12,359 | 35,241 |
Other increase (decrease) | (5,853) | 62,075 |
Book value, ending balance | 411,602 | 426,276 | 346,724
Foreign [member] | AMCI (WA) PTY LTD [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 68,478 | 60,225 |
Share of profits (losses) | 95,188 | (5,127) |
Other increase (decrease) | (1,060) | 13,380 |
Book value, ending balance | 162,606 | 68,478 | 60,225
Foreign [member] | NCR LLC [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance |  | 253,121 |
Acquisition |  | 4,275 |
Share of profits (losses) |  | (266,425) |
Other increase (decrease) |  | 9,029 |
Book value, ending balance |  |  | 253,121
Foreign [member] | KOREA LNG LTD. [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 25,622 | 58,759 |
Dividends | (5,040) | (17,829) |
Share of profits (losses) | 5,192 | 17,714 |
Other increase (decrease) | (6,250) | (33,022) |
Book value, ending balance | 19,524 | 25,622 | 58,759
Foreign [member] | Nickel mining company SAS [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance |  | 87,967 |
Share of profits (losses) |  | (94,353) |
Other increase (decrease) |  | 6,386 |
Book value, ending balance |  |  | 87,967
Foreign [member] | Zhejiang Huayou Posco Esm Co Ltd [Member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance |  | 105,300 |
Share of profits (losses) |  | (117,143) |
Other increase (decrease) |  | 11,843 |
Book value, ending balance |  |  | 105,300
Foreign [member] | PT. Wampu Electric Power [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 17,680 | 15,632 |
Dividends | (1,708) | (1,764) |
Share of profits (losses) | 739 | 1,238 |
Other increase (decrease) | (228) | 2,574 |
Book value, ending balance | 16,483 | 17,680 | 15,632
Foreign [member] | POS-SeAH Steel Wire(Nantong) Co., Ltd. [Member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 10,713 | 8,642 |
Share of profits (losses) | 983 | 573 |
Other increase (decrease) | 298 | 1,498 |
Book value, ending balance | 11,994 | 10,713 | 8,642
Foreign [member] | Other associates and joint ventures [member] |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |
Book value, beginning balance | 265,428 | 233,400 |
Acquisition | 3,088 | 7,860 |
Dividends | (9,526) | (26,222) |
Share of profits (losses) | 2,953 | 12,865 |
Other increase (decrease) | 13,518 | 37,525 |
Book value, ending balance | ₩ 275,461 | ₩ 265,428 | ₩ 233,400

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