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Income taxes - Recoverable and payable taxes (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Current tax assets, current $ 1,502 $ 1,272
Current tax assets, non-current 1,229 1,110
Current tax liabilities, current 882 470
Value Added Tax [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 279 261
Current tax assets, non-current 1 1
Current tax liabilities, current 24 46
Brazilian Federal Contributions [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 917 690
Current tax assets, non-current 855 740
Current tax liabilities, current 69 35
Income Taxes [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 296 309
Current tax assets, non-current 373 369
Current tax liabilities, current 604 221
Financial Compensation For Exploration Of Mineral Resources [Member]    
IfrsStatementLineItems [Line Items]    
Current tax liabilities, current   54
Others [Member]    
IfrsStatementLineItems [Line Items]    
Current tax assets, current 10 12
Current tax liabilities, current $ 119 $ 114