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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Detail) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of reserves within equity [Abstract]
Fair value reserves	€ (189)	€ (113)	€ (98)
Cash flow hedges	(236)	(168)	(174)
Available-for-sale financial assets	47	55	76
Currency retranslation of group companies - see following table	(3,927)	(3,034)	(3,285)
Adjustment on translation of PLC's ordinary capital at 31/9p = €0.16	(164)	(164)	(164)
Capital redemption reserve	32	32	32
Book value of treasury shares - see following table	(9,208)	(4,164)	(4,119)
Other	(177)		(182)
Other reserves	€ (13,633)	€ (7,443)	€ (7,816)

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- Definition

A component of equity representing the reserve for the redemption of the entity's own shares.

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A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

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A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

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A component of equity representing the reserve of gains and losses on financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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A component of equity representing accumulated gains and losses on remeasuring available-for-sale financial assets. [Refer: Financial assets available-for-sale]

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An entity’s own equity instruments, held by the entity or other members of the consolidated group.

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Other miscellaneous reserves.

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Reserve of adjustment on translation of ordinary shares.

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Reserve of currency retranslation of group companies.

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