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Taxation - Tax Effects of Components of Other Comprehensive Income (Detail) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	[1]
Income tax relating to components of other comprehensive income [abstract]
Gains/(losses) on equity instruments at fair value through other comprehensive income, Before tax	€ 16	€ (4)
Gains/(losses) on cash flow hedges, Before tax	89	32
Remeasurements of defined benefit pension plans, Before tax	274	206
Currency retranslation gains/(losses), Before tax	68	(756)
Other comprehensive income, Before tax	447	(522)
Gains/(losses) on equity instruments at fair value through other comprehensive income, Tax (charge)/credit	0	0
Gains/(losses) on cash flow hedges, Tax (charge)/credit	(6)	4
Remeasurements of defined benefit pension plans, Tax (charge)/credit	(7)	(64)
Currency retranslation gains/(losses),Tax (charge)/credit	(4)	1
Other comprehensive income, Tax (charge)/credit	(17)	(59)
Gains/(losses) on Equity instruments at fair value through other comprehensive income, After tax	16	(4)
Gains/(losses) on Cash flow hedges, After tax	83	36
Remeasurements of defined benefit pension plans, After tax	267	142
Currency retranslation gains/(losses), After tax	64	(755)
Other comprehensive income, After tax	€ 430	€ (581)
[1] Restated following adoption of IFRS 16. Refer note 1 and note 9.

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The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax. [Refer: Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to exchange differences on the translation of financial statements of foreign operations. [Refer: Other comprehensive income; Reserve of exchange differences on translation]

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