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Liabilities related to associates and joint ventures - Summarized financial information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in associates and joint ventures        
Current assets $ 24,403 $ 17,042    
Non-current assets 67,604 74,671    
Total assets 92,007 91,713    
Current liabilities 14,594 13,845    
Non-current liabilities 42,592 38,875    
Total liabilities 57,186 52,720    
Negative reserves 34,821 38,993 $ 44,832 $ 44,772
Loss for the year ended 4,531 (2,180) $ 6,988  
Samarco        
Investments in associates and joint ventures        
Current assets 87 34    
Non-current assets 4,582 3,940    
Total assets 4,669 3,974    
Current liabilities 8,370 6,990    
Non-current liabilities 6,385 5,527    
Total liabilities 14,755 12,517    
Negative reserves (10,086) (8,543)    
Loss for the year ended $ (1,160) $ (4,125)