Liquidity - Financial Debt (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Liabilities
Carrying Amount	€ 11,303	€ 6,301
Total current financial liabilities	1,125	1,561
Total non-current financial liabilities	10,553	5,034
Total financial liabilities	€ 11,678	€ 6,595
Financial debt as % of financial liabilities - current	97.00%	96.00%
Interest rate	1.33%	1.29%	1.25%
Bonds
Financial Liabilities
Carrying Amount	€ 10,204	€ 5,147
Private placements
Financial Liabilities
Carrying Amount	1,041	1,130
Bank loans
Financial Liabilities
Carrying Amount	58	24
Current
Financial Liabilities
Nominal volume	759	1,299
Carrying Amount	768	1,298
Total current financial liabilities	€ 1,125	€ 1,561
Financial debt as % of financial liabilities - current	68.00%	83.00%
Current \| Bonds
Financial Liabilities
Nominal volume	€ 750	€ 1,150
Carrying Amount	759	1,149
Current \| Private placements
Financial Liabilities
Nominal volume	0	125
Carrying Amount	0	125
Current \| Bank loans
Financial Liabilities
Nominal volume	9	24
Carrying Amount	9	24
Non Current
Financial Liabilities
Nominal volume	10,572	4,965
Carrying Amount	10,536	5,002
Total non-current financial liabilities	€ 10,553	€ 5,034
Financial debt as % of financial liabilities - non-current	100.00%	99.00%
Non Current \| Bonds
Financial Liabilities
Nominal volume	€ 9,512	€ 4,000
Carrying Amount	9,445	3,997
Non Current \| Private placements
Financial Liabilities
Nominal volume	1,011	965
Carrying Amount	1,041	1,005
Non Current \| Bank loans
Financial Liabilities
Nominal volume	49	0
Carrying Amount	€ 49	€ 0

The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of current financial liabilities. [Refer: Financial liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The percent of financial debt to current financial liabilities.

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The percent of financial debt to financial liabilities.

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