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Hybrid Bonds - Summary of Hybrid Bonds (Parenthetical) (Detail) - Hybrid bond 1-2 [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Maturity date 30 years (The issuer has a right to extend the maturity date)  
Interest rate 4.64% 4.64%
Interest payments condition Quarterly (The issuer may defer interest payments except in cases where it resolves to pay dividends or repays pari passu debt and subordinated debt)  
Others The issuer can call the hybrid bond 5 years of after issuance  
POSCO HOLDINGS INC [Member]    
Disclosure of detailed information about borrowings [line items]    
Hybrid Bonds Classified As Equity Acquired ₩ 500,000  
Hybrid Bonds Classified As Equity ₩ 600,000  
Every Year [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate adjustment 0.75%