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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Vessel
T
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
KRW (₩)
Disclosure of contingent liabilities [line items]      
Borrowings | ₩ ₩ 28,492,000   ₩ 25,997,367
Credit Commitments [Member]      
Disclosure of contingent liabilities [line items]      
Gross loan commitments | ₩ ₩ 36,127,400    
POSCO HOLDINGS INC [Member]      
Disclosure of contingent liabilities [line items]      
Borrowings | $   $ 1,020  
Posco [member]      
Disclosure of contingent liabilities [line items]      
Nickel contracts terms 1 year    
Remaining iron ore to be purchased 48,000,000    
Remaining coal to be purchased 18,000,000    
Liquefied natural gas to be purchased 550,000    
Liquefied natural gas terms 20 years    
Liquefied natural gas revised quantity to be purchased 120,000    
Number of vessels for transportation of raw materials | Vessel 32    
Average remaining contract period 6 years    
Percentage of rights and obligations 59.00%    
Liquefied Natural Gas Right To Use 200,000    
Proportion of voting rights held in joint venture 59.00%    
POSCO FUTURE M CO., LTD. [Member]      
Disclosure of contingent liabilities [line items]      
Capital Contributions | $   484,364  
Long-term borrowings [member] | POSCO HOLDINGS INC [Member]      
Disclosure of contingent liabilities [line items]      
Borrowings | $   $ 1,050  
Treasury shares [member] | POSCO HOLDINGS INC [Member]      
Disclosure of contingent liabilities [line items]      
Treasury shares | shares 86,611    
POSCO INTERNATIONAL SINGAPORE PTE LTD [member] | Posco [member]      
Disclosure of contingent liabilities [line items]      
Liquefied natural gas to be purchased 370,000    
Liquefied natural gas terms 15 years    
Period of extension of the purchase contract 5 years    
Top of range [member] | Korea National Oil Corporation [member] | Posco [member]      
Disclosure of contingent liabilities [line items]      
Iron ore and coal contracts terms 3 years    
Korea Ambatovy Consortium [member] | POSCO INTERNATIONAL CORPORATION [Member]      
Disclosure of contingent liabilities [line items]      
Percentage of rights and obligations 15.33%    
Proportion of voting rights held in joint venture 15.33%