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Investments (Details 6) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | € 276 | € 660
Additions and subscriptions |  | 3 | 8
Divestments and reimbursements |  | (19) | (399)
Currency translation differences |  | (23) | 4
Other changes |  | (18) | 3
Net book amount at the Ending of the year |  | 219 | 276
Gross carrying amount [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 280 |
Net book amount at the Ending of the year |  | 227 | 280
Accumulated impairment [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 4 |
Net book amount at the Ending of the year |  | 8 | 4
Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 10 | 10
Additions and subscriptions |  |  | 3
Currency translation differences |  | (1) | (2)
Other changes |  | (4) | (1)
Net book amount at the Ending of the year |  | 5 | 10
Associates [Member] | Gross carrying amount [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 10 |
Net book amount at the Ending of the year |  | 5 | 10
Other Related Parties [Member] | At Fair Value [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  |  | 368
Divestments and reimbursements |  |  | (368)
Other Related Parties [Member] | At Cost [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 237 | 257
Additions and subscriptions |  | 3 |
Divestments and reimbursements |  | (13) | (31)
Currency translation differences |  | (22) | 6
Other changes |  | (5) | 5
Net book amount at the Ending of the year |  | 200 | 237
Other Related Parties [Member] | At Cost [Member] | Gross carrying amount [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 240 |
Net book amount at the Ending of the year |  | 207 | 240
Other Related Parties [Member] | At Cost [Member] | Accumulated impairment [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 3 |
Net book amount at the Ending of the year |  | 7 | 3
Unconsolidated Structured Entities [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year | [1] | 29 |
Net book amount at the Ending of the year | [1] | 14 | 29
Unconsolidated Structured Entities [Member] | Total entity's for related parties [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 29 | 25
Additions and subscriptions |  |  | 5
Divestments and reimbursements |  | (6) |
Other changes |  | (9) | (1)
Net book amount at the Ending of the year |  | 14 | 29
Unconsolidated Structured Entities [Member] | Total entity's for related parties [Member] | Gross carrying amount [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 30 |
Net book amount at the Ending of the year |  | 15 | 30
Unconsolidated Structured Entities [Member] | Total entity's for related parties [Member] | Accumulated impairment [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Net book amount at the beginning of the year |  | 1 |
Net book amount at the Ending of the year |  | € 1 | € 1
[1] | Each individual amount included herein was lower than &euro;25 million.

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