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Condensed consolidated statements of cash flows - additional details - Change in net current assets and other operating cash flow items (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Cash Flow Statement [Abstract] |  |
(Increase) in inventories | $ (57) | $ (94)
(Increase) in trade receivables | (122) | (94)
Increase in trade payables | 134 | 47
Net change in other current assets | (73) | 74
Net change in other current liabilities | (64) | 10
Total | $ (182) | $ (57)

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- Definition Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_a&doctype=Standard -URIDate 2018-03-16 + Details
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