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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, 2021 | Jun. 30, 2020
Cash Flow Statement [Abstract] |  |
(Increase) in inventories | $ (184) | $ (192)
(Increase)/decrease in trade receivables | (117) | 185
Increase/(decrease) in trade payables | 23 | (71)
Net change in other operating assets | 20 | 77
Net change in other operating liabilities | (18) | (152)
Total | $ (276) | $ (153)

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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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 2020-01-01 -Paragraph 20 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20_a&doctype=Standard -URIDate 2020-01-01 + Details
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