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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flow Statement [Abstract]
(Increase) in inventories	$ (159)	$ (108)	$ (150)
Decrease/(increase) in trade receivables	43	(115)	53
(Decrease)/increase in trade payables	(21)	84	44
Net change in other current assets	127	(26)	83
Net change in other current liabilities	(35)	117	50
Total	$ (45)	$ (48)	$ 80

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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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