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Segmentation of key figures - Net sales by region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure of geographical areas [line items]
Net sales to third parties	$ 1,198	$ 1,863	$ 3,020	$ 3,640
Percentage of entity's revenue	100.00%	100.00%	100.00%	100.00%
United States
Disclosure of geographical areas [line items]
Net sales to third parties	$ 493	$ 779	$ 1,285	$ 1,516
Percentage of entity's revenue	41.00%	42.00%	43.00%	42.00%
International
Disclosure of geographical areas [line items]
Net sales to third parties	$ 705	$ 1,084	$ 1,735	$ 2,124
Percentage of entity's revenue	59.00%	58.00%	57.00%	58.00%

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

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The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

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