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Financial Instruments Fair Value Risk - Summary of Reconciliation of Movements in Level 3 Valuations (Detail) - Fair value [Member] - Level 3 Fair Value Measurements of Financial Assets [Member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Fair Value Measurement of Assets [Line Items] |  |
Assets beginning balance | € (106) | € 346
Gains and losses recognised in profit and loss | 26 | 94
Gains and losses recognised in other comprehensive income | 2 | (12)
Purchases and new issues | (89) | (247)
Sales and settlements | (17) | (187)
Transfers into Level 3 | 83 |
Transfers out of Level 3 |  | (100)
Assets ending balance | € (101) | € (106)

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_25&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_e_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The gains (losses) recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_e_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_e_iv&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_e_iv&doctype=Standard -URIDate 2016-03-31 + Details
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