Liquidity - Financial Debt (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial Liabilities
Carrying Amount	€ 13,617	€ 11,303
Total current financial liabilities	3,273	1,125
Total non-current financial liabilities	12,923	10,553
Total financial liabilities	€ 16,196	€ 11,678
Financial debt as % of financial liabilities - current	84.00%	97.00%
Interest rate	1.09%	1.33%	1.29%
Bonds
Financial Liabilities
Carrying Amount	€ 9,433	€ 10,204
Private placements
Financial Liabilities
Carrying Amount	1,067	1,041
Commercial Papers
Financial Liabilities
Carrying Amount	1,100
Bank loans
Financial Liabilities
Carrying Amount	2,017	58
Current
Financial Liabilities
Nominal Volume	2,529	759
Carrying Amount	2,531	768
Total current financial liabilities	€ 3,273	€ 1,125
Financial debt as % of financial liabilities - current	77.00%	68.00%
Current \| Bonds
Financial Liabilities
Nominal Volume	€ 1,150	€ 750
Carrying Amount	1,150	759
Current \| Private placements
Financial Liabilities
Nominal Volume	258	0
Carrying Amount	259	0
Current \| Commercial Papers
Financial Liabilities
Nominal Volume	1,100
Carrying Amount	1,100
Current \| Bank loans
Financial Liabilities
Nominal Volume	21	9
Carrying Amount	22	9
Non Current
Financial Liabilities
Nominal Volume	11,139	10,572
Carrying Amount	11,086	10,535
Total non-current financial liabilities	€ 12,923	€ 10,553
Financial debt as % of financial liabilities - non-current	86.00%	100.00%
Non Current \| Bonds
Financial Liabilities
Nominal Volume	€ 8,367	€ 9,512
Carrying Amount	8,283	9,445
Non Current \| Private placements
Financial Liabilities
Nominal Volume	772	1,011
Carrying Amount	808	1,041
Non Current \| Commercial Papers
Financial Liabilities
Nominal Volume	0
Carrying Amount	0
Non Current \| Bank loans
Financial Liabilities
Nominal Volume	2,000	49
Carrying Amount	€ 1,995	€ 49

The interest rate on borrowings. [Refer: Borrowings]

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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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No definition available.

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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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