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Segmentation of key figures - Net sales by region (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of geographical areas [line items]        
Net sales to third parties $ 1,863 $ 1,819 $ 3,640 $ 3,598
Percentage of entity's revenue 100.00% 100.00% 100.00% 100.00%
United States [member]        
Disclosure of geographical areas [line items]        
Net sales to third parties $ 779 $ 750 $ 1,516 $ 1,462
Percentage of entity's revenue 42.00% 41.00% 42.00% 41.00%
International [member]        
Disclosure of geographical areas [line items]        
Net sales to third parties $ 1,084 $ 1,069 $ 2,124 $ 2,136
Percentage of entity's revenue 58.00% 59.00% 58.00% 59.00%