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Additional disclosure items G.3.1. Litigation and legal risks (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of contingent liabilities [line items]
Legal proceedings provision	$ 26	$ 29
Joint ventures
Disclosure of contingent liabilities [line items]
Legal proceedings provision	4	2
Legal proceedings contingent liability
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	687	438
Legal proceedings contingent liability | Joint ventures
Disclosure of contingent liabilities [line items]
Estimated financial effect of contingent liabilities	$ 5	$ 5

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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 the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Paragraph 86
-Subparagraph a
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-URIDate 2018-03-16

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- Definition

The amount of provision for legal proceedings. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Section Example 10 A court case
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-URIDate 2018-03-16

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