Financial Instruments - Additional Information (Detail) € in Millions	Jan. 01, 2018 EUR (€)
Disclosure of detailed information about financial instruments [abstract]
Financial assets previously measured at fair value through equity were reclassified as fair value through profit or loss under IFRS 9	€ 207
Financial assets previously measured at fair value through profit or loss were reclassified to amortised cost under IFRS 9	€ 6

The amount of financial assets in the statement of financial position that were previously designated as measured at fair value through profit or loss but are no longer so designated, and that were reclassified due to requirements of IFRS 9 when the entity initially applies IFRS 9. [Refer: Financial assets at fair value through profit or loss]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 42I
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_42I_c&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_FinancialAssetsPreviouslyDesignatedAtFairValueThroughProfitOrLossReclassifiedDueToRequirementsOfIFRS9FirstApplicationOfIFRS9
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant