Loans, borrowings, leases, cash and cash equivalents and short-term investments - Total debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Loans and borrowings
Current debt, accrued charges	$ 201	$ 203
Non-current debt, accrued charges		8
Current debt	887	1,214
Non-current	12,473	11,842
Notional amount	$ 1,296
EUR
Loans and borrowings
Average cost (as a percent)	4.29%
R$
Loans and borrowings
Average cost (as a percent)	2.99%
Quoted in the secondary market \| Bonds
Loans and borrowings
Borrowings, interest rate	6.01%
Non-current debt, before accrued charges	$ 7,448	5,948
Quoted in the secondary market \| Eurobonds
Loans and borrowings
Borrowings, interest rate	4.29%
Non-current debt, before accrued charges	$ 920	843
Quoted in the secondary market \| Debentures
Loans and borrowings
Borrowings, interest rate	10.48%
Current debt, before accrued charges	$ 107	374
Non-current debt, before accrued charges	$ 389	621
Debt contracts in Brazil \| TJLP, TR, IPCA, IGP-M and CDI \| R$
Loans and borrowings
Borrowings, interest rate	9.29%
Current debt, before accrued charges	$ 320	276
Non-current debt, before accrued charges	$ 540	1,056
Debt contracts in Brazil \| Basket of currencies and bonds in US$ indexed to LIBOR
Loans and borrowings
Borrowings, interest rate	2.31%
Current debt, before accrued charges	$ 45	44
Non-current debt, before accrued charges	$ 11	56
Debt contracts in Brazil \| Fixed interest \| R$
Loans and borrowings
Borrowings, interest rate	2.86%
Current debt, before accrued charges	$ 20	43
Non-current debt, before accrued charges	$ 14	45
Debt contracts in the international markets \| US$
Loans and borrowings
Borrowings, interest rate	2.24%
Current debt, before accrued charges	$ 182	260
Non-current debt, before accrued charges	$ 3,044	2,934
Debt contracts in the international markets \| EUR
Loans and borrowings
Non-current debt, before accrued charges		225
Debt contracts in the international markets \| Fixed interest \| Other currencies
Loans and borrowings
Borrowings, interest rate	3.17%
Current debt, before accrued charges	$ 12	14
Non-current debt, before accrued charges	$ 107	$ 106

The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings]

+ References

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