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Consolidated statement of cash flows - additional details - Change in net current assets and other operating cash flow items (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flow Statement [Abstract]
(Increase) in inventories	$ (108)	$ (150)	$ (87)
(Increase)/decrease in trade receivables	(115)	53	(54)
Increase in trade payables	84	44	48
Net change in other current assets	(26)	83	87
Net change in other current liabilities	117	50	42
Total	$ (48)	$ 80	$ 36

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- Definition

Cash Flow Statement [Abstract]

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No definition available.

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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 accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: 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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Adjustments for increase (decrease) in trade accounts payable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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The increase (decrease) in working capital.

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