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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

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