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Financial liabilities (Details Textual)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
EUR (€)
Disclosure Of Information on net borrowings [Line Items]          
Repayments of non-current borrowings € 2,757 € 2,973 € 2,323    
Borrowings, maturity 18 months        
Debts Subjected to covenants € 1,337 1,664      
Borrowings 25,865 24,707      
Notional amount 4,596        
Financial liabilities, at fair value 23,764      
Foreign Currency Translation Differences Other Than Functional Currency 314        
Cash and cash equivalents 10,836 [1] 7,363 [1] € 5,674 [1]   € 5,209
Maximum Amount Drawn 16,700        
Bonds issued 2,844        
Uncommitted borrowing facilities [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Undrawn borrowing facilities 12,484 11,584      
Committed [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Undrawn borrowing facilities € 5,214 € 5,802      
Bottom of range [member]          
Disclosure Of Information on net borrowings [Line Items]          
Discount rates used to measure fair value of financial debt (0.20%) (0.20%)   (0.20%)  
Top of range [member]          
Disclosure Of Information on net borrowings [Line Items]          
Discount rates used to measure fair value of financial debt 2.90% 2.50%   2.90%  
Ordinary Bonds Issued [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Borrowings   € 17,965   $ 2,800  
Euro Medium Term Notes [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Borrowings € 16,904        
Maximum Amount Issuable | $       $ 20,000  
Other Bonds [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Borrowings 2,800        
Long term debt and current portion of longterm debt [Member]          
Disclosure Of Information on net borrowings [Line Items]          
Borrowings € 25,865 € 24,707      
[1] Cash and cash equivalents as of December 31, 2018, include €19 million of cash and cash equivalents of consolidated subsidiaries held for sale that were reported in the item Assets held for sale in the balance sheet