Loans, borrowings, cash and cash equivalents and financial investments - Average annual interest rate by currency (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Loans and borrowings
Total debt	$ 13,056	$ 15,466
Derivative instrument to mitigate cash flow of floating rate debt \| Debt in Brazilian real with derivative offset
Loans and borrowings
Average interest rate	3.09%
Notional amount	$ 2,435
Derivative instrument to mitigate cash flow of floating rate debt \| Eurobonds with derivative offset
Loans and borrowings
Average interest rate	4.29%
US$
Loans and borrowings
Average interest rate	5.57%
Total debt	$ 9,370
R$
Loans and borrowings
Average interest rate	9.38%
Total debt	$ 2,461
EUR
Loans and borrowings
Average interest rate	3.77%
Total debt	$ 1,103
Other currencies
Loans and borrowings
Average interest rate	3.58%
Total debt	$ 122

The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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