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Other items from operating activities - Other non-current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other non-current assets      
Loans and advances $ 1,982 $ 1,877 $ 2,878
Other non-current financial assets related to operational activities 332 471 937
Other 101 161 169
Total 2,415 2,509 3,984
Gross value/Cost      
Other non-current assets      
Loans and advances 2,248 2,180 3,237
Other non-current financial assets related to operational activities 332 471 937
Other 101 161 169
Total 2,681 2,812 4,343
Valuation allowance/Cumulative impairments      
Other non-current assets      
Loans and advances (266) (303) (359)
Total $ (266) $ (303) $ (359)