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Long-term debt and current portion of long-term debt (Details 1) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings € 24,707 € 27,239
Current portion of non-current borrowings 2,286 3,279
Non-current portion of non-current borrowings € 20,179 20,564
Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings, maturity 2018–2032  
Borrowings € 4,001  
Non-current portion of non-current borrowings € 3,200  
Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings, maturity 2018–2043  
Borrowings € 17,965 19,003
Non-current portion of non-current borrowings € 16,520  
Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings, maturity 2018–2032  
Borrowings € 112  
Non-current portion of non-current borrowings € 72  
Convertible bonds issued {Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings, maturity 2022  
Borrowings € 387  
Non-current portion of non-current borrowings 387  
Long-term debt and current portion of long-term debt [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Borrowings 22,465 23,843
Non-current portion of non-current borrowings 20,179 € 20,564
Not later than one year [member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 2,286  
Not later than one year [member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 801  
Not later than one year [member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 1,445  
Not later than one year [member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 40  
Later than one year and not later than two years [member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 3,821  
Later than one year and not later than two years [member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 1,290  
Later than one year and not later than two years [member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 2,486  
Later than one year and not later than two years [member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 45  
Later than two years and not later than three years [member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 3,103  
Later than two years and not later than three years [member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 729  
Later than two years and not later than three years [member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 2,371  
Later than two years and not later than three years [member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 3  
Later than three years and not later than four years [member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 1,278  
Later than three years and not later than four years [member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 341  
Later than three years and not later than four years [member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 934  
Later than three years and not later than four years [member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 3  
Later than four years and not later than five years [member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 1,230  
Later than four years and not later than five years [member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 143  
Later than four years and not later than five years [member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 697  
Later than four years and not later than five years [member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 3  
Later than four years and not later than five years [member] | Convertible bonds issued {Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 387  
Later than Five Years [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 10,747  
Later than Five Years [Member] | Unsecured Bank Loans Received [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 697  
Later than Five Years [Member] | Ordinary Bonds Issued [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings 10,032  
Later than Five Years [Member] | Other Borrowings [Member]    
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]    
Non-current portion of non-current borrowings € 18