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Related Party Transactions - Related Account Balances of Significant Transactions Between the Company, Excluding the Controlling Company, and Related Parties (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of transactions between related parties [line items] |  |  |  |
Loan | ₩ 572,568 | ₩ 581,267 | ₩ 510,570 | ₩ 532,515
AMCI (WA) PTY LTD |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 136,580 | 142,767 | 112,177 | 104,281
Nickel mining company SAS [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 75,857 | 68,793 | 64,197 | 63,024
UITrans LRT Co., Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 39,333 | 51,051 | 46,335 | 36,510
FQM Australia Holdings Pty Ltd [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 292,591 | 292,764 | ₩ 256,938 | ₩ 247,868
Company, excluding the controlling company [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 447,706 | 482,551 |  |
Loan | 572,568 | 581,267 |  |
Other receivables | 206,894 | 169,133 |  |
Total receivables | 1,227,168 | 1,232,951 |  |
Trade accounts and notes payable | 535,965 | 432,387 |  |
Other payables | 73,568 | 121,930 |  |
Total payables | 609,533 | 554,317 |  |
Company, excluding the controlling company [member] | New Songdo International City Development, LLC [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 25,497 | 96,730 |  |
Other receivables | 10,100 | 1,657 |  |
Total receivables | 35,597 | 98,387 |  |
Other payables | 4 | 30,087 |  |
Total payables | 4 | 30,087 |  |
Company, excluding the controlling company [member] | Gyeonggi Green Energy Co., Ltd. [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 0 | 5,846 |  |
Other receivables | 14,832 | 10,706 |  |
Total receivables | 14,832 | 16,552 |  |
Other payables | 0 | 567 |  |
Total payables | 0 | 567 |  |
Company, excluding the controlling company [member] | POSCO(Guangdong) Automotive Steel Co, Ltd [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 32,218 | 46,547 |  |
Loan | 6,212 | 6,162 |  |
Other receivables |  | 0 |  |
Total receivables | 38,430 | 52,709 |  |
Trade accounts and notes payable | 37,313 | 48,866 |  |
Total payables | 37,313 | 48,866 |  |
Company, excluding the controlling company [member] | AMCI (WA) PTY LTD |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 136,580 | 142,767 |  |
Total receivables | 136,580 | 142,767 |  |
Company, excluding the controlling company [member] | HBIS-POSCO Automotive Steel Co.,Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 3,701 | 13,924 |  |
Other receivables |  | 0 |  |
Total receivables | 3,701 | 13,924 |  |
Trade accounts and notes payable | 15,584 | 5,483 |  |
Other payables | 207 | 1,922 |  |
Total payables | 15,791 | 7,405 |  |
Company, excluding the controlling company [member] | POS-SEAHSTEELWIRE(TIANJIN)CO.,Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 4,965 | 5,970 |  |
Total receivables | 4,965 | 5,970 |  |
Company, excluding the controlling company [member] | Samcheok Blue Power Co., Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 273,880 | 189,173 |  |
Other receivables | 193 | 148 |  |
Total receivables | 274,073 | 189,321 |  |
Other payables | 381 | 77,187 |  |
Total payables | 381 | 77,187 |  |
Company, excluding the controlling company [member] | Nickel mining company SAS [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 75,857 | 68,793 |  |
Other receivables | 707 | 122 |  |
Total receivables | 76,564 | 68,915 |  |
Other payables | 358 | 358 |  |
Total payables | 358 | 358 |  |
Company, excluding the controlling company [member] | POS-SeAH Steel Wire(Nantong) Co., Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 13,334 | 19,628 |  |
Total receivables | 13,334 | 19,628 |  |
Trade accounts and notes payable | 150 |  |  |
Total payables | 150 |  |  |
Company, excluding the controlling company [member] | POSCO MC MATERIALS |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 10,838 | 14,544 |  |
Other receivables | 358 | 168 |  |
Total receivables | 11,196 | 14,712 |  |
Trade accounts and notes payable | 894 | 1,314 |  |
Other payables | 506 | 357 |  |
Total payables | 1,400 | 1,671 |  |
Company, excluding the controlling company [member] | Pocheon-Hwado Highway Corp. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 5,491 | 10,985 |  |
Total receivables | 5,491 | 10,985 |  |
Other payables | 2 | 0 |  |
Total payables | 2 | 0 |  |
Company, excluding the controlling company [member] | UITrans LRT Co., Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 0 | 13,592 |  |
Loan | 39,333 | 51,051 |  |
Other receivables | 4,214 | 9,187 |  |
Total receivables | 43,547 | 73,830 |  |
Other payables |  | 0 |  |
Total payables |  | 0 |  |
Company, excluding the controlling company [member] | Roy Hill Holdings Pty Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 39,761 | 25,023 |  |
Other receivables | 9,610 | 8,836 |  |
Total receivables | 49,371 | 33,859 |  |
Trade accounts and notes payable | 426,829 | 356,234 |  |
Other payables | 0 | 25 |  |
Total payables | 426,829 | 356,259 |  |
Company, excluding the controlling company [member] | SNNC [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 10,694 | 12,861 |  |
Other receivables | 28,433 | 70 |  |
Total receivables | 39,127 | 12,931 |  |
Trade accounts and notes payable | 5,439 | 10,322 |  |
Other payables | 447 | 1,298 |  |
Total payables | 5,886 | 11,620 |  |
Company, excluding the controlling company [member] | FQM Australia Holdings Pty Ltd [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Loan | 292,591 | 292,764 |  |
Other receivables |  | 0 |  |
Total receivables | 292,591 | 292,764 |  |
Company, excluding the controlling company [member] | Others |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Trade accounts and notes receivable | 27,327 | 27,728 |  |
Loan | 21,995 | 19,730 |  |
Other receivables | 138,447 | 138,239 |  |
Total receivables | 187,769 | 185,697 |  |
Trade accounts and notes payable | 49,756 | 10,168 |  |
Other payables | 71,663 | 10,129 |  |
Total payables | ₩ 121,419 | ₩ 20,297 |  |

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