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Marketable securities, commodities, time deposits, derivative financial instruments and cash and cash equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of marketable securities commodities deposits derivative instruments and cash [abstract]
Marketable securities	$ 26	$ 61
Commodities	111	110
Time deposits with original maturity more than 90 days	1,609	61
Derivative financial instruments	159	102
Total marketable securities, commodities, time deposits and derivative financial instruments	$ 1,905	$ 334

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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+ Details

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X

- Definition

The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph d
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X

- Definition

The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
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- References

No definition available.

+ Details

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- References

No definition available.

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- References

No definition available.

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