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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract] |  |  |  |
Additions | $ 649 | $ 719 | $ 698 |
Change in advances to suppliers | (4) | 1 | 2 |
Change in accruals and payables for property, plant and equipment | (22) | 17 | (25) |
Finance leases | (1) | (1) | (43) |
Cash used for additions | $ 622 | $ 736 | $ 632 | [1]
[1] | 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.

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