Commitments - Guarantees provided (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments
Fair value of guarantee recorded in Other non-current liabilities	$ 353		$ 222
Certain associates and joint ventures
Commitments
Fair value of guarantee recorded in Other non-current liabilities	525	$ 166
Financial guarantees provided	$ 1,655	$ 1,735

The amount of related-party commitments made by the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Number 24
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-URIDate 2019-03-27

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]]

+ References

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-URIDate 2019-03-27

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