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Brumadinho dam failure - De-characterization of the upstream dams (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Provisions.        
Balance at beginning of the period     $ 3,989  
Balance at end of the period $ 4,021   4,021  
Expense incurred in relation to Brumadinho event 185 $ 109 300 $ 268
Brumadinho event        
Provisions.        
Balance at beginning of the period     6,864  
Impact on the income statement     300  
Present value adjustment     (132)  
Disbursements     (612)  
Translation adjustment     226  
Balance at end of the period 6,646   6,646  
Expense incurred in relation to Brumadinho event 185 $ 109 300 $ 268
Global Settlement for Brumadinho | Brumadinho event        
Provisions.        
Balance at beginning of the period     3,989  
Present value adjustment     (83)  
Disbursements     (26)  
Translation adjustment     141  
Balance at end of the period 4,021   4,021  
Provision for individual indemnification and other commitments | Brumadinho event        
Provisions.        
Balance at beginning of the period     586  
Present value adjustment     (6)  
Disbursements     (123)  
Translation adjustment     13  
Balance at end of the period 470   470  
De-characterization of dams | Brumadinho event        
Provisions.        
Balance at beginning of the period     2,289  
Present value adjustment     (43)  
Disbursements     (163)  
Translation adjustment     72  
Balance at end of the period 2,155   2,155  
Incurred expenses | Brumadinho event        
Provisions.        
Impact on the income statement     300  
Disbursements     (300)  
Liabilities related to Brumadinho | Brumadinho event        
Provisions.        
Balance at beginning of the period     4,575  
Present value adjustment     (89)  
Disbursements     (149)  
Translation adjustment     154  
Balance at end of the period $ 4,491   $ 4,491