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Provisions and other current liabilities - Accruals for deductions from revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]
January 1	$ 212	$ 194	$ 213
Additions	540	662	603
Payments/utilizations	(537)	(646)	(613)
Changes in offset against gross trade receivables	(2)	1	2
Currency translation effects	4	1	(11)
December 31	$ 217	$ 212	$ 194

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- Definition

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+ References

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- Definition

Increase (Decrease) Through Changes In Offset Against Receivables, Current Contract Liabilities

+ References

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+ Details

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- Definition

Increase (Decrease) Through Foreign Exchange, Current Contract Liabilities

+ References

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- Definition

Increase Due To Additions, Current Contract Liabilities

+ References

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- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
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-URIDate 2020-01-01

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