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Segmentation of key figures - Net sales by region (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of geographical areas [line items] |  |  |  |
Net sales to third parties | $ 2,094 | $ 1,198 | $ 4,004 | $ 3,020
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 | $ 958 | $ 493 | $ 1,793 | $ 1,285
Percentage of entity's revenue | 46.00% | 41.00% | 45.00% | 43.00%
International |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net sales to third parties | $ 1,136 | $ 705 | $ 2,211 | $ 1,735
Percentage of entity's revenue | 54.00% | 59.00% | 55.00% | 57.00%

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