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Related parties transactions - Schedule of related parties transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party [Abstract]          
Sales from the Company to former parent $ 0 $ 1 $ 0 $ 2  
Contract manufacturing revenues from former parent 0 0 47 0  
Purchases of the Company from former parent 0 $ 1 19 $ 2  
Receivables from former parent 0   0   $ 20
Payables to former parent 0   0   85
Other financial receivables from former parent 0   0   39
Other financial liabilities to former parent $ 0   $ 0   $ 67