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General Information - POSCO HOLDINGS INC.'S Shareholders (Detail) - shares | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 80,932,952 | 82,624,377 | 84,571,230
Ownership (%) |  | 100.00% |  |
National Pension Service [member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 6,441,610 |  |
Ownership (%) |  | 7.96% |  |
BlackRock Fund Advisors [member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares | [1] | 4,206,522 |  |
Ownership (%) | [1] | 5.20% |  |
CITIBANK.N.A [Member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 2,289,755 |  |
Ownership (%) |  | 2.83% |  |
Pohang University of Science and Technology [Member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 1,981,047 |  |
Ownership (%) |  | 2.45% |  |
Samsung Group [Member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 1,861,979 |  |
Ownership (%) |  | 2.30% |  |
Others [member] |  |  |  |
Disclosure of details of shareholders [line items] |  |  |  |
Number of shares |  | 64,152,039 |  |
Ownership (%) |  | 79.26% |  |
[1] | Includes shares held by subsidiaries and others.

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