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General Information - Details of Non-controlling Interest (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]        
Current assets ₩ 43,584,798 ₩ 44,065,460    
Non-current assets 61,702,880 59,378,275    
Current liabilities (23,070,658) (22,741,063)    
Non-current liabilities (19,824,308) (19,259,904)    
Equity 62,392,712 61,442,768 ₩ 59,598,600 ₩ 58,191,897
Non-controlling interests 6,633,508 6,052,549    
Revenue 68,986,938 73,459,408 77,056,549  
Profit (loss) for the period 527,023 1,005,276 1,846,059  
Profit (loss) attributable to non-controlling interests (163,663) (120,104) 147,857  
Cash flows from operating activities 4,571,910 6,663,655 6,167,695  
Cash flows from investing activities (6,687,278) (4,486,783) (7,388,224)  
Effect of exchange rate fluctuation on cash held (5,578) 221,880 16,719  
Net increase (decrease) in cash and cash equivalents 281,902 97,019 (1,382,403)  
POSCO INTERNATIONAL Corporation [member]        
Disclosure of subsidiaries [line items]        
Current assets 7,555,975 8,268,175 8,077,260  
Non-current assets 11,197,035 9,068,151 8,540,488  
Current liabilities (6,612,176) (6,659,697) (6,275,479)  
Non-current liabilities (4,328,180) (3,327,166) (3,717,507)  
Equity 7,812,654 7,349,463 6,624,762  
Non-controlling interests 989,277 1,089,512 1,121,823  
Revenue 32,373,604 32,340,793 33,132,821  
Profit (loss) for the period 636,802 503,410 680,419  
Profit (loss) attributable to non-controlling interests 42,727 104,424 141,618  
Cash flows from operating activities 1,941,539 876,881 1,076,436  
Cash flows from investing activities (1,329,738) (846,138) (27,128)  
Cash flows from financing activities (465,306) (176,074) (1,225,373)  
Effect of exchange rate fluctuation on cash held (30,393) 65,672 15,222  
Net increase (decrease) in cash and cash equivalents 116,102 (79,659) (176,065)  
POSCO FUTURE M CO., LTD. [Member]        
Disclosure of subsidiaries [line items]        
Current assets 2,170,138 2,112,748 2,411,881  
Non-current assets 6,973,758 5,819,711 3,922,712  
Current liabilities (1,658,341) (1,570,070) (1,396,408)  
Non-current liabilities (2,973,477) (3,041,884) (2,326,719)  
Equity 4,512,078 3,320,505 2,611,466  
Non-controlling interests 969,142 700,123 666,420  
Revenue 2,938,698 3,699,944 4,759,871  
Profit (loss) for the period 36,522 (231,338) 4,435  
Profit (loss) attributable to non-controlling interests 17,039 (78,781) 25,365  
Cash flows from operating activities (33,577) 670,850 (444,846)  
Cash flows from investing activities (1,726,808) (1,810,360) (1,031,418)  
Cash flows from financing activities 1,430,280 1,375,379 1,591,574  
Effect of exchange rate fluctuation on cash held 5,730 18,768 (7,111)  
Net increase (decrease) in cash and cash equivalents (324,375) 235,869 108,199  
POSCO Eco & Challenge Co., Ltd        
Disclosure of subsidiaries [line items]        
Current assets 5,983,732 5,253,321 6,379,394  
Non-current assets 2,411,581 2,448,945 2,357,217  
Current liabilities (3,995,466) (3,304,067) (4,713,198)  
Non-current liabilities (1,390,467) (892,031) (610,218)  
Equity 3,009,380 3,506,168 3,413,195  
Non-controlling interests 1,290,254 1,495,379 1,483,382  
Revenue 6,795,197 10,239,966 10,095,060  
Profit (loss) for the period (499,626) 108,682 176,827  
Profit (loss) attributable to non-controlling interests (100,303) 66,458 89,042  
Cash flows from operating activities (950,239) 13,430 (294,596)  
Cash flows from investing activities 444,649 (76,358) 318,890  
Cash flows from financing activities 933,357 (360,662) 78,748  
Effect of exchange rate fluctuation on cash held (11,658) 14,878 1,444  
Net increase (decrease) in cash and cash equivalents 416,109 (408,712) 104,487  
POSCO DX Co., Ltd [Member]        
Disclosure of subsidiaries [line items]        
Current assets 611,990 676,688 661,856  
Non-current assets 222,402 215,765 227,952  
Current liabilities (251,651) (355,027) (421,367)  
Non-current liabilities (10,180) (11,528) (6,991)  
Equity 572,561 525,898 461,450  
Non-controlling interests 185,187 169,964 149,812  
Revenue 1,075,175 1,473,291 1,485,876  
Profit (loss) for the period 52,624 88,599 92,128  
Profit (loss) attributable to non-controlling interests 6,595 29,331 30,506  
Cash flows from operating activities 145,951 97,800 21,821  
Cash flows from investing activities (6,201) (12,603) 19,264  
Cash flows from financing activities (21,378) (17,219) (12,975)  
Effect of exchange rate fluctuation on cash held (602) 1,039 39  
Net increase (decrease) in cash and cash equivalents ₩ 117,770 ₩ 69,017 ₩ 28,148