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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
	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

Cash Flow Statement [Abstract]

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Change In Net Current Assets And Other Operating Cash Flow Items

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Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in other current assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current assets; Profit (loss)]

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Adjustments for decrease (increase) in trade and other receivables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other receivables; Profit (loss)]

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Adjustments for increase (decrease) in other current liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Other current liabilities; Profit (loss)]

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