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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, 2020	Jun. 30, 2019
Cash Flow Statement [Abstract]
(Increase) in inventories	$ (192)	$ (57)
Decrease/(increase) in trade receivables	185	(122)
Increase/(decrease) in trade payables	(71)	134
Net change in other current assets	77	(73)
Net change in other current liabilities	(152)	(64)
Total	$ (153)	$ (182)

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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 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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