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Financial Instruments - Summary of Fair Values of Financial Assets and Financial Liabilities (Detail) - EUR (€) € in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financial assets
Cash and cash equivalents	€ 3,991	€ 3,317	€ 5,016
Fair value [member]
Financial assets
Cash and cash equivalents	3,991	3,317	5,016
Held-to-maturity investments		163	152
Loans and receivables		463	304
Available-for-sale financial assets		564	655
Amortised cost	632
Fair value through other comprehensive income	288
Financial assets	5,499	4,762	6,526
Financial liabilities
Preference shares			(125)
Bank loans and overdrafts	(1,131)	(995)	(829)
Bonds and other loans	(27,842)	(23,368)	(19,031)
Finance lease creditors	(151)	(147)	(153)
Derivatives	(542)	(421)	(253)
Other financial liabilities	(390)	(177)
Financial liabilities	(30,056)	(25,108)	(20,391)
Fair value [member] | Derivatives [member]
Financial assets
Financial assets at fair value through profit or loss	209	116	293
Fair value [member] | Other [member]
Financial assets
Financial assets at fair value through profit or loss	379	139	106
Carrying amount [member]
Financial assets
Cash and cash equivalents	3,991	3,317	5,016
Held-to-maturity investments		163	152
Loans and receivables		463	304
Available-for-sale financial assets		564	655
Amortised cost	632
Fair value through other comprehensive income	288
Financial assets	5,499	4,762	6,526
Financial liabilities
Preference shares			(68)
Bank loans and overdrafts	(1,128)	(992)	(825)
Bonds and other loans	(27,426)	(22,709)	(18,353)
Finance lease creditors	(135)	(131)	(134)
Derivatives	(542)	(421)	(253)
Other financial liabilities	(390)	(177)
Financial liabilities	(29,621)	(24,430)	(19,633)
Carrying amount [member] | Derivatives [member]
Financial assets
Financial assets at fair value through profit or loss	209	116	293
Carrying amount [member] | Other [member]
Financial assets
Financial assets at fair value through profit or loss	€ 379	€ 139	€ 106

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments]

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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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The amount of non-derivative financial assets with fixed or determinable payments and fixed maturity that an entity has the positive intention and ability to hold to maturity other than: (a) those that the entity upon initial recognition designates as at fair value through profit or loss; (b) those that the entity designates as available for sale; and (c) those that meet the definition of loans and receivables. An entity shall not classify any financial assets as held to maturity if the entity has, during the current financial year or during the two preceding financial years, sold or reclassified more than an insignificant amount of held-to-maturity investments before maturity (more than insignificant in relation to the total amount of held-to-maturity investments) other than sales or reclassifications that: (i) are so close to maturity or the financial asset’s call date (for example, less than three months before maturity) that changes in the market rate of interest would not have a significant effect on the financial asset’s fair value; (ii) occur after the entity has collected substantially all of the financial asset’s original principal through scheduled payments or prepayments; or (iii) are attributable to an isolated event that is beyond the entity’s control, is non-recurring and could not have been reasonably anticipated by the entity. [Refer: Derivative financial assets; Held-to-maturity investments; Prepayments]

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The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

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Bonds and other loans.

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Preferred shares liabilities.

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