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Financial assets and liabilities - Loans and financing (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 13,782 $ 15,027
Debt contracts in the international markets    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 12,180 13,360
Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 12,022 13,159
Gross carrying amount | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,615 3,225
Gross carrying amount | EUR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 87  
Gross carrying amount | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 107 120
Gross carrying amount | TJLP, TR, IPCA, IGP-M and CDI    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 354 860
Gross carrying amount | Fixed rate    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 13 34
Gross carrying amount | LIBOR | Basket of currencies and US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 11 56
Gross carrying amount | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 7,448 7,448
Gross carrying amount | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   920
Gross carrying amount | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 387 496
Fair value    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 13,400 15,866
Fair value | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,231 3,278
Fair value | EUR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 54  
Fair value | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 117 134
Fair value | TJLP, TR, IPCA, IGP-M and CDI    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 449 857
Fair value | Fixed rate    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   35
Fair value | LIBOR | Basket of currencies and US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 11 56
Fair value | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 9,151 10,025
Fair value | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   985
Fair value | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 387 $ 496