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Other current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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