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Additional disclosure items G.2.1. Capital commitments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Capital Commitments [Line Items] |  |
Capital commitments | $ 154 | $ 194
1 year |  |
Capital Commitments [Line Items] |  |
Capital commitments | 126 | 182
Joint ventures |  |
Capital Commitments [Line Items] |  |
Capital commitments | 66 | 25
Joint ventures | 1 year |  |
Capital Commitments [Line Items] |  |
Capital commitments | $ 56 | $ 23

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition [Line Items] for Capital Commitments [Table] + References No definition available. + Details
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- Details
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- Details
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