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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]      
Additions $ 520 $ 202 $ 158
Change in accruals and payables for intangibles (315) (32) (10)
Cash used for additions $ 202 $ 171 $ 148 [1]
[1] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.