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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reserves within equity [abstract]
Fair value reserves	€ (194)	€ (189)	€ (113)
Equity instruments	98
Cash flow hedges	(292)	(236)	(168)
Available-for-sale financial assets		47	55
Currency retranslation of group companies - see following table	(4,764)	(3,927)	(3,034)
Adjustment on translation of PLC's ordinary capital at 31/9p = €0.16	(150)	(164)	(164)
Capital redemption reserve	32	32	32
Book value of treasury shares - see following table	(10,181)	(9,208)	(4,164)
Hedging gains/(losses) transferred to non-financial assets(a)	71
Other	(100)	(177)
Other reserves	€ (15,286)	€ (13,633)	€ (7,443)

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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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