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Other current assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Subclassifications of assets, liabilities and equities [abstract] |  |
Current portion of long-term financial investments measured at FVPL | $ 12 | $ 33
Current portion of long-term receivables from customers | 107 | 122
Current portion of minimum lease payments from finance lease agreements | 29 | 46
Prepaid expenses | 93 | 89
Other receivables, security deposits and current assets | 88 | 147
Derivative financial instruments | 3 | 1
VAT receivable | 72 | 64
Total other current assets | $ 404 | $ 502

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