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Financial and other non-current assets - Financial Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Long-term financial investments measured at FVOCI $ 28 $ 31
Long-term financial investments measured at FVPL 12 28
Long-term receivables from customers 117 136
Minimum lease payments from finance lease agreements 39 78
Long-term loans, advances, and security deposits 22 34
Total financial assets $ 218 $ 307