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Shareholders' equity and share-based payments - Perpetual subordinated notes (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
tranche
Dec. 31, 2015
USD ($)
tranche
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Shareholders' equity          
Number of tranches of deeply subordinated perpetual maturity callable notes issued | tranche   3 2    
Amount of perpetual deeply subordinated notes recorded in equity | $ $ 10,328        
Coupons booked in deduction of shareholders' equity | $ $ 302 $ 203 $ 114    
Subordinated note, 3.875%, perpetual maturity callable after 6 years          
Shareholders' equity          
Interest rate       3.875%  
Years after which notes are callable   6 years      
Principal amount       € 1,750  
Subordinated note, 2.708%, perpetual maturity callable after 6.6 years          
Shareholders' equity          
Interest rate       2.708%  
Years after which notes are callable   6 years 7 months 6 days      
Principal amount       € 1,000  
Subordinated note, 3.369%, perpetual maturity callable after 10 years          
Shareholders' equity          
Interest rate       3.369%  
Years after which notes are callable   10 years      
Principal amount       € 1,500  
Subordinated note, 2.250%, perpetual maturity callable after 6 years          
Shareholders' equity          
Interest rate         2.25%
Years after which notes are callable     6 years    
Principal amount         € 2,500
Subordinated note, 2.625%, perpetual maturity callable after 10 years          
Shareholders' equity          
Interest rate         2.625%
Years after which notes are callable     10 years    
Principal amount         € 2,500