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Employees - Schedule of Charges Related to Equity-Settled Plans (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of share based compensation plans [Line Items] |  |  |
Income statement charge | € (284) | € (198) | € (150)
Performance share plans [member] |  |  |
Disclosure of share based compensation plans [Line Items] |  |  |
Income statement charge | (273) | (185) | (143)
Other plans [member] |  |  |
Disclosure of share based compensation plans [Line Items] |  |  |
Income statement charge | € (11) | € (13) | € (7)

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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Disclosure of share based compensation plans. + References No definition available. + Details
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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |