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Financial and other non-current assets - Financial Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]    
Long-term financial investments measured at FVOCI $ 31 $ 19
Long-term financial investments measured at FVPL 28 67
Long-term receivables from customers 136 164
Minimum lease payments from finance lease agreements 78 91
Long-term loans, advances, and security deposits 34 47
Total financial assets $ 307 $ 388