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Long-term assets - E.1.4. Cash used for the purchase of intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Subclassifications of assets, liabilities and equities [abstract]      
Additions $ 158 $ 130  
Change in accruals and payables for intangibles (10) 3  
Cash used for additions $ 148 $ 133 [1] $ 143
[1] Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.