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Other items from operating activities - Other financial income and expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other items from operating activities      
Dividend income on non-consolidated subsidiaries $ 167 $ 170 $ 267
Capitalized financial expenses 460 477 364
Other 330 324 251
Other financial income 957 971 882
Accretion of asset retirement obligations (544) (523) (513)
Other (98) (113) (141)
Other financial expense $ (642) $ (636) $ (654)