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Other items from operating activities - Loans and advances, valuation allowance (Details) - Loans and advances - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Valuation allowance as of the beginning of the period $ (286) $ (280) $ (672)
Increases (50) (15) (62)
Decreases 11 7 393
Currency translation adjustment and other variations (34) 2 61
Valuation allowance as of the end of the period $ (359) $ (286) $ (280)