v3.25.2
Brumadinho dam failure (Details Narrative)
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Present value at nominal rate 8.51% 7.88%
Description of alleged losses the Claimants initially estimated the amount of the alleged losses would be approximately US$330 (R$1,800 million), subject to interest and monetary adjustments. In another proceeding filed by foreign legal entities, the Claimants initially estimated the amount of the alleged losses would be approximately US$715 (R$3,900 million), subject to interest and monetary adjustments. In the procedure presented by minority shareholders, the applicants estimated the alleged losses at approximately US$550 (R$3,000 million), subject to interest and monetary adjustments, which could be increased later, as alleged by the applicants.  
Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Estimated obligation average period 5 years  
Top of range [member]    
IfrsStatementLineItems [Line Items]    
Estimated obligation average period 7 years