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Other current assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Subclassifications of assets, liabilities and equities [abstract] |  |
Current portion of long-term financial investments measured at FVPL | $ 33 | $ 31
Current portion of long-term receivables from customers | 122 | 133
Current portion of minimum lease payments from finance lease agreements | 46 | 57
Prepaid expenses | 89 | 46
Other receivables, security deposits and current assets | 147 | 52
Derivative financial instruments | 1 | 0
VAT receivable | 64 | 68
Total other current assets | $ 502 | $ 387

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