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Current financial debt and derivative financial instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of current financial debt and derivative instruments [abstract]
Interest bearning accounts of associates payable on demand	$ 2,085	$ 1,836
Bank and other financial debt	976	719
Commercial Papers	4,258	2,289
Current portion of non-current financial debt	2,272	2,002
Fair value of derivative financial instruments	194	185
Total current financial debt and derivative financial instruments	$ 9,785	$ 7,031
Weighted average interest rate, associates	0.40%	0.50%
Weighted average interest rate on Bank and other financial debt	5.00%	12.90%

X

- Definition

The amount of commercial paper issued by the entity.

+ References

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

The current portion of non-current borrowings. [Refer: Borrowings]

+ References

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

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

+ References

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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Weighted average interest rate on interest bearning accounts of associates payable on demand.

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