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Financial assets and liabilities - Loans and financing (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 13,862 $ 15,027
Debt contracts in Brazil    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 960 1,470
Debt contracts in the international markets    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 11,194 11,890
Carrying amount    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 11,998 13,159
Carrying amount | Quoted in the secondary market | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 7,448 7,448
Carrying amount | Quoted in the secondary market | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   920
Carrying amount | Quoted in the secondary market | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 428 496
Carrying amount | Debt contracts in Brazil | TJLP, TR, IPCA, IGP-M and CDI | R$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 460 860
Carrying amount | Debt contracts in Brazil | Fixed interest | R$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 25 34
Carrying amount | Debt contracts in Brazil | LIBOR | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 33 56
Carrying amount | Debt contracts in the international markets | Fixed interest | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,398 3,225
Carrying amount | Debt contracts in the international markets | Fixed interest | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 110 120
Carrying amount | Debt contracts in the international markets | LIBOR | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 96  
Fair value    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 14,090 15,866
Fair value | Quoted in the secondary market | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 9,277 10,025
Fair value | Quoted in the secondary market | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   985
Fair value | Quoted in the secondary market | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 435 496
Fair value | Debt contracts in Brazil | TJLP, TR, IPCA, IGP-M and CDI | R$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 679 857
Fair value | Debt contracts in Brazil | Fixed interest | R$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 25 35
Fair value | Debt contracts in Brazil | LIBOR | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 54 56
Fair value | Debt contracts in the international markets | Fixed interest | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,401 3,278
Fair value | Debt contracts in the international markets | Fixed interest | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 123 $ 134
Fair value | Debt contracts in the international markets | LIBOR | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 96