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Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items]    
Book amount at the beginning of the year € 4,040 € 2,853
Additions and subscriptions 507 1,156
Divestments and reimbursements (462) (138)
Share of profit of equity accounted investments 124 77
Share of loss of equity-accounted investments (353) (370)
Deduction for dividends (86) (100)
Changes in scope of consolidation 2 569
Currency translation differences (268) 46
Other changes 7 (53)
Book amount at the end of the year 3,511 4,040
Joint Ventures Where EntityIs Venturer [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Book amount at the beginning of the year 2,675 1,275
Additions and subscriptions 63 1,085
Share of profit of equity accounted investments 49 50
Share of loss of equity-accounted investments (340) (208)
Deduction for dividends (41) (45)
Changes in scope of consolidation   564
Currency translation differences (127) 12
Other changes 53 (58)
Book amount at the end of the year 2,332 2,675
Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Book amount at the beginning of the year 1,197 1,403
Additions and subscriptions 444 63
Divestments and reimbursements (462) (138)
Share of profit of equity accounted investments 66 17
Share of loss of equity-accounted investments (6) (154)
Deduction for dividends (13) (53)
Currency translation differences (128) 29
Other changes (35) 30
Book amount at the end of the year 1,063 1,197
Unconsolidated Structured Entities [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Book amount at the beginning of the year 168 175
Additions and subscriptions   8
Share of profit of equity accounted investments 9 10
Share of loss of equity-accounted investments (7) (8)
Deduction for dividends (32) (2)
Changes in scope of consolidation 2 5
Currency translation differences (13) 5
Other changes (11) (25)
Book amount at the end of the year € 116 € 168