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Capital and Funding - Summary of Currency Retranslation Reserve (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Movement in foreign currency translation reserve [Abstract]
Currency retranslation reserve beginning balance	€ (3,034)	€ (3,285)
Currency retranslation during the year	(50)	599
Movement in net investment hedges and exchange differences in net investments in foreign operations	(909)	(365)
Recycled to income statement	66	17
Currency retranslation reserve ending balance	€ (3,927)	€ (3,034)

X

- Definition

The amount of reclassification adjustments related to change in value of foreign currency basis spreads, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

A component of equity representing the accumulated change in the value of foreign currency basis spreads of financial instruments when excluding them from the designation of these financial instruments as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Effective 2018-01-01
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
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-IssueDate 2016-01-13
-Paragraph 6.5.16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2016-03-30&anchor=para_6.5.16&doctype=Standard
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- Definition

Fair value movements on available for sale investments recycled to income statement group.

+ References

No definition available.

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- Definition

Gain (loss) in net investment hedges and exchange differences in net investments in foreign operations.

+ References

No definition available.

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- Definition

Movement in foreign currency translation reserve.

+ References

No definition available.

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