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Long-term assets - E.2.3. Cash used for the purchase of tangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]      
Additions $ 719 $ 698 $ 824
Change in advances to suppliers 1 2 (8)
Change in accruals and payables for property, plant and equipment 17 (25) 26
Finance leases (1) (43) (192)
Cash used for additions $ 736 $ 632 [1] $ 650 [1]
[1] Re-presented for discontinued operations (shown in note A.4. and E.4.2.). 2018 and 2017 were not restated for the application of IFRS 16, and , additionally,2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.