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Other items from operating activities - Other non-current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other non-current assets      
Loans and advances $ 2,878 $ 3,048 $ 3,407
Other non-current financial assets related to operational activities 937 1,069 891
Other 169 26 57
Total 3,984 4,143 4,355
Gross value/Cost      
Other non-current assets      
Loans and advances 3,237 3,334 3,687
Other non-current financial assets related to operational activities 937 1,069 891
Other 169 26 57
Total 4,343 4,429 4,635
Valuation allowance      
Other non-current assets      
Loans and advances (359) (286) (280)
Total $ (359) $ (286) $ (280)