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Related parties (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Aggregate continuing and discontinued operations [member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue $ 638 $ 736 $ 1,182
Financial result (443) 161 344
Cost and operating expenses (1,367) (964) (1,024)
Companhia Siderurgica Do Pecem [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue   93 434
Financial result     (3)
Alianca Geracao De Energia S A [Member]      
IfrsStatementLineItems [Line Items]      
Cost and operating expenses (63) (126) (121)
Pelletizing Companies [Member]      
IfrsStatementLineItems [Line Items]      
Financial result (26) (38) (34)
Cost and operating expenses (308) (227) (337)
Mrs Logistica S.A. [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue     1
Cost and operating expenses (429) (453) (397)
Norte Energia S.a. [Member]      
IfrsStatementLineItems [Line Items]      
Cost and operating expenses (66) (107) (135)
Other Joint Ventures [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 29 32 41
Financial result (3) 1  
Cost and operating expenses (72) (10) (8)
Total for all joint ventures [member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 29 125 476
Financial result (29) (37) (37)
Cost and operating expenses (938) (923) (998)
Vli S.A. [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 359 321 289
Financial result (2) (3) (3)
Cost and operating expenses (26) (29) (26)
PTVI [Member]      
IfrsStatementLineItems [Line Items]      
Cost and operating expenses (397)    
Other Associates [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue     1
Financial result 3    
Cost and operating expenses (2) (1)  
Total for all associates [member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 359 321 290
Financial result 1 (3) (3)
Cost and operating expenses (425) (30) (26)
Cosan [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3 10  
Cost and operating expenses (4) (11)  
Bradesco [Member]      
IfrsStatementLineItems [Line Items]      
Financial result (416) 201 381
Mitsui Co. Ltd [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 247 280 416
Banco Do Brasil [Member]      
IfrsStatementLineItems [Line Items]      
Financial result 1   3
Major Shareholders [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 250 290 416
Financial result (415) 201 $ 384
Cost and operating expenses $ (4) $ (11)