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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Net debt and Short-term investments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and borrowings          
Total of loans and borrowings $ 13,360 $ 13,056      
Cash and cash equivalents 13,487 7,350 $ 5,784 $ 5,784 $ 4,328
Short-term investments 771 826      
Net debt (cash) (898) 4,880      
Leasing 1,667 1,791      
Debt contracts in the international markets          
Loans and borrowings          
Total of loans and borrowings 11,890 10,494      
Debt contracts in Brazil          
Loans and borrowings          
Total of loans and borrowings $ 1,470 $ 2,562