Financial Assets and Liabilities - Movement in Financial Liabilities (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial liabilities [line items]
Financial liabilities, beginning balance	€ 53,440
Financial liabilities, ending balance	52,089	€ 53,440
Debenture and bond issues
Disclosure of financial liabilities [line items]
Financial liabilities, beginning balance	42,084	43,557
New issues	8,390	5,693
Redemptions, conversions and exchanges	(6,687)	(6,873)
Revaluation and other movements	(2,499)	(293)
Financial liabilities, ending balance	41,288	42,084
Promissory notes and commercial paper
Disclosure of financial liabilities [line items]
Financial liabilities, beginning balance	3,360	1,815
New issues	60	1,566
Redemptions, conversions and exchanges	(1,008)	(25)
Revaluation and other movements	(6)	4
Financial liabilities, ending balance	2,406	3,360
Issues
Disclosure of financial liabilities [line items]
Financial liabilities, beginning balance	45,444	45,372
New issues	8,450	7,259
Redemptions, conversions and exchanges	(7,695)	(6,898)
Revaluation and other movements	(2,505)	(289)
Financial liabilities, ending balance	€ 43,694	€ 45,444

- Definition

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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