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Deferred tax assets (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
DisclosureOfDeferredTaxesLineItems [Line Items]  
Deferred tax assets at Dec 31, 2016 € 3,790
Additions 2,129
Deductions (1,239)
Currency translation differences (660)
Other changes 58
Deferred tax assets at Dec 31, 2017 4,078
Deferred tax assets [Member]  
DisclosureOfDeferredTaxesLineItems [Line Items]  
Deferred tax assets at Dec 31, 2016 9,412
Additions 2,341
Deductions (1,588)
Currency translation differences (862)
Other changes 37
Deferred tax assets at Dec 31, 2017 9,340
Provisions for impairments [Member]  
DisclosureOfDeferredTaxesLineItems [Line Items]  
Deferred tax assets at Dec 31, 2016 (5,622)
Additions (212)
Deductions 349
Currency translation differences 202
Other changes 21
Deferred tax assets at Dec 31, 2017 € (5,262)