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Other financial assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items]    
Other non-current financial assets € 1,675 € 1,860
Financing receivables held for operating purposes [Member]    
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items]    
Other non-current financial assets 1,602 1,785
Securities held for operating purposes [Member]    
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items]    
Other non-current financial assets € 73 € 75