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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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