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Income taxes - Recoverable and payable taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Current tax assets, current $ 1,272 $ 862
Current tax assets, non-current 1,110 935
Current tax liabilities, current 470 2,177
Value Added Tax [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 261 217
Current tax assets, non-current 1 11
Current tax liabilities, current 46 162
Brazilian Federal Contributions [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 690 520
Current tax assets, non-current 740 511
Current tax liabilities, current 35 12
Income Taxes [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 309 113
Current tax assets, non-current 369 413
Current tax liabilities, current 221 1,861
Financial Compensation For Exploration Of Mineral Resources [Member]    
IfrsStatementLineItems [Line Items]    
Current tax liabilities, current 54 59
Others [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 12 12
Current tax liabilities, current $ 114 $ 83