Fair value of financial assets and liabilities - Reconciliation of the fair value hierarchy (Detail) € in Millions	12 Months Ended
Dec. 31, 2017 EUR (€)
Gains and losses recognized [Abstract]
Financial assets, end of period	€ 372
Level 3 of fair value hierarchy [Member]
Disclosure of fair value of financial assets and liabilities [Line items]
Financial assets, beginning of period	111
Gains and losses recognized [Abstract]
Financial assets, end of period	372
Financial assets [Member] \| Level 3 of fair value hierarchy [Member]
Gains and losses recognized [Abstract]
In profit or loss	2
In other comprehensive income	(83)
Purchase	356
Sales	(10)
Transfer to assets held for sale	€ (4)

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities]

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The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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The gains (losses) recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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