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Investments in subsidiaries, associates and joint ventures - Financial information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Investments in associates and joint ventures        
Current assets $ 24,403 $ 17,042    
Non-current assets 67,604 74,671    
Total assets 92,007 91,713    
Current liabilities 14,594 13,845    
Non-current liabilities 42,592 38,875    
Total liabilities 57,186 52,720    
Stockholders' equity 34,821 38,993 $ 44,832 $ 44,772
Net revenue 40,018 37,570 36,575  
Net income (loss) $ 4,531 (2,180) $ 6,988  
Number of joint ventures accounted under equity method | item 5      
VLI S.A.        
Investments in associates and joint ventures        
Current assets $ 614 805    
Non-current assets 3,737 4,507    
Total assets 4,351 5,312    
Current liabilities 607 773    
Non-current liabilities 2,123 2,380    
Total liabilities 2,729 3,153    
Stockholders' equity 1,622 2,159    
Net revenue 1,011 1,238    
Net income (loss) (59) 2    
Alianca Geracao de Energia S.A.        
Investments in associates and joint ventures        
Current assets 138 215    
Non-current assets 711 880    
Total assets 849 1,095    
Current liabilities 48 99    
Non-current liabilities 134 142    
Total liabilities 182 241    
Stockholders' equity 668 854    
Net revenue 186 257    
Net income (loss) 51 57    
Alianca Norte Energia Participacoes S.A.        
Investments in associates and joint ventures        
Non-current assets 229 314    
Total assets 229 314    
Stockholders' equity 229 314    
Net income (loss) (15) 8    
California Steel Industries, Inc        
Investments in associates and joint ventures        
Current assets 336 481    
Non-current assets 344 344    
Total assets 680 825    
Current liabilities 63 186    
Non-current liabilities 148 155    
Total liabilities 211 341    
Stockholders' equity 469 484    
Net revenue 665 997    
Net income (loss) (14) 46    
Companhia Siderurgica do Pecem        
Investments in associates and joint ventures        
Current assets 346 438    
Non-current assets 2,234 2,960    
Total assets 2,581 3,398    
Current liabilities 737 985    
Non-current liabilities 2,623 2,675    
Total liabilities 3,360 3,660    
Stockholders' equity (779) (262)    
Net revenue 1,176 1,393    
Net income (loss) (835) (412)    
Pelletizing        
Investments in associates and joint ventures        
Current assets 300 720    
Non-current assets 258 315    
Total assets 558 1,035    
Current liabilities 53 297    
Non-current liabilities   2    
Total liabilities 53 299    
Stockholders' equity 504 736    
Net revenue 104 583    
Net income (loss) 73 392    
MRS Logistica S.A.        
Investments in associates and joint ventures        
Current assets 412 490    
Non-current assets 1,701 2,196    
Total assets 2,113 2,686    
Current liabilities 389 415    
Non-current liabilities 898 1,242    
Total liabilities 1,286 1,657    
Stockholders' equity 827 1,029    
Net revenue 640 759    
Net income (loss) 70 103    
Nacala Corridor        
Investments in associates and joint ventures        
Current assets 524 384    
Non-current assets 4,349 4,505    
Total assets 4,874 4,889    
Current liabilities 573 516    
Non-current liabilities 4,684 4,671    
Total liabilities 5,257 5,187    
Stockholders' equity (383) (298)    
Net revenue 611 782    
Net income (loss) $ (87) $ (49)