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Recoverable and payable taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Tax disclosure [Line Items]    
Current assets $ 862 $ 509
Non-current assets 935 1,091
Current liabilities 2,177 952
Value-added tax    
Tax disclosure [Line Items]    
Current assets 217 254
Non-current assets 11 179
Current liabilities 162 17
Brazilian federal contributions    
Tax disclosure [Line Items]    
Current assets 520 136
Non-current assets 511 458
Current liabilities 12 14
Income taxes.    
Tax disclosure [Line Items]    
Current assets 113 107
Non-current assets 413 454
Current liabilities 1,861 773
Financial compensation for the exploration of mineral resources - CFEM    
Tax disclosure [Line Items]    
Current liabilities 59 80
Others.    
Tax disclosure [Line Items]    
Current assets 12 12
Current liabilities $ 83 $ 68