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Capital structure and financing - C.6. Net financial obligations, table 1 (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [2]
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Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract] |  |  |  |  |  |
Total debt and financing | $ 5,691 | $ 5,972 |  |  |  |
Lease liabilities | 1,021 | 1,096 |  |  |  |
Gross financial obligations | 6,711 | 7,068 |  |  |  |
Cash and cash equivalents | (875) | (1,164) | [1] | $ (528) | [2] | $ (619)
Pledged deposits | 0 | (1) |  |  |  |
Time deposits related to bank borrowings | 0 | (1) |  |  |  |
Net financial obligations at the end of the year | 5,837 | 5,902 |  | $ 4,596 |  |
Add (less) derivatives related to debt (note D.1.2.) | 12 | (17) |  |  |  |
Net financial obligations including derivatives related to debt | 5,849 | 5,885 |  |  |  |
Restricted cash | $ 199 | $ 155 | [1] |  |  |
[1] | The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).
[2] | 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.

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