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Goodwill and Other Intangible Assets, Net - Allocation of Goodwill to Individually Operating Entities Which are Determined to be CGUs (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Cash_Generating_Units
Dec. 31, 2024
KRW (₩)
Cash_Generating_Units
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 22 20
Goodwill ₩ 826,772 ₩ 357,851
Steel [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 9 9
Infrastructure Trading [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 6 5
Construction [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 1 1
Logistics and others [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 2 2
Rechargeable Battery Materials [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 3 3
CHEMGAS KOREA CO.,LTD. | Steel [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs CHEMGAS KOREA CO.,LTD.  
Goodwill ₩ 39,378 ₩ 0
POSCO Center Beijing [member] | Steel [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs POSCO Center Beijing  
Goodwill ₩ 195 192
Others [member] | Steel [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs Others  
Goodwill ₩ 12,865 13,748
Others [member] | Infrastructure Trading [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs Others  
Goodwill ₩ 9,374 8,205
Others [member] | Rechargeable Battery Materials [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Total number of CGUs | Cash_Generating_Units 1  
CGUs Others  
Goodwill ₩ 112 ₩ 0
POSCO INTERNATIONAL Corporation—Global Business Division [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Discount rate 5.51% 7.37%
Terminal growth rate 1.00% 1.00%
Discount rate increase 1.00%  
Value in use decrease due to increase in terminal growth rate, amount ₩ 1,710,249  
Value in use decrease due to increase in discount rate 16.93%  
Terminal growth rate decrease 1.00%  
Value in use decrease due to decrease in terminal growth rate 4.68%  
Value in use decrease due to decrease in terminal growth rate, amount ₩ 472,760  
POSCO INTERNATIONAL Corporation—Global Business Division [member] | Infrastructure Trading [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs POSCO INTERNATIONAL Corporation — Global Business Division(*1)  
Goodwill ₩ 240,092 ₩ 240,092
POSCO INTERNATIONAL Corporation — Energy Division [member] | Infrastructure Trading [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs POSCO INTERNATIONAL Corporation — Energy Division  
Goodwill ₩ 26,471 26,471
POSCO WIDE Co., Ltd. [member] | Construction [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs POSCO WIDE Co., Ltd  
Goodwill ₩ 32,585 32,585
Shinan Green Energy Co., Ltd. [Member] | Logistics and others [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs Shinan Green Energy Co., Ltd.  
Goodwill ₩ 108 108
POSCO FUTURE M CO., LTD [member] | Rechargeable Battery Materials [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs POSCO FUTURE M CO., LTD  
Goodwill ₩ 8,800 8,800
Posco Silicon Solution Co., Ltd [Member] | Rechargeable Battery Materials [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs Posco Silicon Solution Co., Ltd  
Goodwill ₩ 31,155 27,542
Zhangjiagang Pohang Refractions Co., Ltd. [Member] | Rechargeable Battery Materials [Member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs Zhangjiagang Pohang Refractions Co., Ltd.  
Goodwill ₩ 108 108
PT Prime Agri Resources [Member] | Infrastructure Trading [member]    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGUs PT. Prime Agri Resources  
Goodwill ₩ 425,529 ₩ 0