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Liabilities related to associates and joint ventures - Summarized financial information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in associates and joint ventures        
Current assets $ 22,360 $ 24,403    
Non-current assets. 67,082 67,604    
Total assets 89,442 92,007    
Current liabilities 15,198 14,594    
Non-current liabilities 38,938 42,592    
Total liabilities 54,136 57,186    
Negative reserves 35,306 34,821 $ 38,993 $ 44,832
Loss for the year ended 24,844 6,255 $ 439  
Samarco        
Investments in associates and joint ventures        
Current assets 561 87    
Non-current assets. 2,921 4,582    
Total assets 3,482 4,669    
Current liabilities 10,902 8,370    
Non-current liabilities 7,040 6,385    
Total liabilities 17,942 14,755    
Negative reserves (14,460) (10,086)    
Loss for the year ended $ (3,208) $ (1,160)