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Financial expenses, net - Schedule of Financial Expenses (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Expenses [Line Items] |  |  |  |
Interest expenses and other bank charges |  | $ 963 | $ 881 | $ 920
Income from investments | [1] | (104) | (41) | (39)
Foreign exchange (gains) losses, net |  | (26) | (15) | 13
Other, net | [2] |  | (4) | 65
Total finance expense, net |  | $ 834 | $ 822 | $ 959
[1] | In 2020, Income from investments comprised mainly of revaluation gain of Teva’s investment in American Well Corporation (“American Well”). See note 20.
[2] | In 2018, Other, net comprised mainly of a make-whole payment of $46 million following early redemption of senior notes during 2018.

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