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Long-term debt and current portion of long-term debt (Details 4) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	€ 24,707	€ 27,239
Long-term debt and current portion of long-term debt [Member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	22,465	23,843
Euro [Member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	€ 20,094	€ 21,545
Borrowings, interest rate	2.40%	2.70%
United States of America, Dollars [Member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	€ 1,694	€ 1,587
Borrowings, interest rate	4.80%	5.20%
British Pound [Member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	€ 521	€ 540
Borrowings, interest rate	5.30%	5.30%
Japan, Yen [Member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Borrowings	€ 156	€ 171
Borrowings, interest rate	2.60%	2.60%

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The amount of outstanding funds that the entity is obligated to repay.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

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