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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	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and borrowings
Leases	$ 1,708		$ 1,667
Total of loans, borrowings and leases	13,862		15,027
Cash and cash equivalents	13,649	$ 12,883	13,487	$ 12,113	$ 11,788	$ 7,350
Short-term investments	951		771
Net debt (cash)	(738)		769
Debt contracts in the international markets
Loans and borrowings
Total of loans, borrowings and leases	11,194		11,890
Debt contracts in Brazil
Loans and borrowings
Total of loans, borrowings and leases	$ 960		$ 1,470

X

- Definition

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

+ References

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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- Definition

The amount of current investments.

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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.

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No definition available.

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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

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The amount of net debt of the entity.

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