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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

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