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Brumadinho dam failure - De-characterization of the upstream dams (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Provisions.    
Balance at the beginning $ 4,522  
Balance at the end 4,580 $ 4,522
Expense incurred in relation to Brumadinho event   510
Brumadinho event.    
Provisions.    
Balance at the beginning 4,575  
Operating expense 851  
Disbursements (1,898)  
Translation adjustment (320)  
Balance at the end 3,537 4,575
Present value adjustment 329  
Global Settlement for Brumadinho    
Provisions.    
Operating expense 340  
Global Settlement for Brumadinho | Brumadinho event.    
Provisions.    
Balance at the beginning 3,989  
Monetary and present value adjustments 340  
Disbursements (1,056)  
Translation adjustment (289)  
Balance at the end 2,984 3,989
Present value adjustment $ 170 $ 5
Discount rate 8.08% 5.92%
Provision for individual indemnification and other commitments | Brumadinho event.    
Provisions.    
Balance at the beginning $ 586  
Operating expense 201  
Monetary and present value adjustments (11)  
Disbursements (192)  
Translation adjustment (31)  
Balance at the end 553 $ 586
Incurred expenses | Brumadinho event.    
Provisions.    
Operating expense 650  
Disbursements $ (650)