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Acquisitions and divestitures - Effects on the balace sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Assets      
Inventories $ 4,482 $ 4,377  
Investments [1] 61 184  
Property, plant and equipment 44,938 41,931 $ 41,148
Total Assets 86,894 89,442  
Liabilities 49,536 54,136  
Other liabilities $ 3,321 3,112  
Coal [Member]      
Assets      
Accounts receivable    
Inventories   167  
Taxes   364  
Investments    
Property, plant and equipment    
Other assets   21  
Total Assets   552  
Suppliers and contractors   110  
Other liabilities   232  
Total liabilities    342  
Manganese Assets [Member]      
Assets      
Accounts receivable   11  
Inventories   12  
Taxes   17  
Investments    
Property, plant and equipment    
Other assets   1  
Total Assets   41  
Suppliers and contractors   10  
Other liabilities   3  
Total liabilities    13  
C S I [Member]      
Assets      
Accounts receivable    
Inventories    
Taxes    
Investments   377  
Property, plant and equipment    
Other assets    
Total Assets   377  
Suppliers and contractors    
Other liabilities    
Total liabilities     
Other [Member]      
Assets      
Accounts receivable    
Inventories    
Taxes    
Investments    
Property, plant and equipment   6  
Other assets    
Total Assets   6  
Suppliers and contractors    
Other liabilities    
Total liabilities     
Total [Member]      
Assets      
Accounts receivable   11  
Inventories   179  
Taxes   381  
Investments   377  
Property, plant and equipment   6  
Other assets   22  
Total Assets   976  
Suppliers and contractors   120  
Other liabilities   235  
Total liabilities    $ 355  
[1] Substantially comprises investments in exclusive investment fund, whose portfolio is composed of committed transactions and Financial Treasury Bills (“LFTs”), which are floating-rate securities issued by the Brazilian government.