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Liabilities related to associates and joint ventures - Summarized financial information of Samarco (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Current assets $ 15,526 $ 22,360  
Non current assets 71,368 67,082  
Total assets 86,894 89,442  
Current liabilities 13,891 15,198  
Non current liabilities 35,645 38,938  
Total liabilities 49,536 54,136  
Net income (loss) for the year ended 18,870 22,468 $ 4,531
Samarco [Member]      
IfrsStatementLineItems [Line Items]      
Current assets 454 561  
Non current assets 2,748 2,921  
Total assets 3,202 3,482  
Current liabilities 10,808 10,902  
Non current liabilities 7,401 7,040  
Total liabilities 18,209 17,942  
Negative reserves (15,007) (14,460)  
Net income (loss) for the year ended $ 11 $ (3,208)