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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 €25 million.