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Employee - Summary of Status of Performance Share Plans and Related Changes (Detail) - Performance share plans [member] | 12 Months Ended
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Dec. 31, 2017 shares € / shares | Dec. 31, 2016 shares € / shares | Dec. 31, 2015 shares € / shares
Disclosure of share based compensation plans [Line Items] |  |  |
Outstanding at 1 January | 14,818,060 | 15,979,140 | 17,468,291
Awarded | 4,962,345 | 7,016,274 | 8,890,394
Vested | (4,723,861) | (6,983,053) | (8,448,454)
Forfeited | (1,371,797) | (1,194,301) | (1,931,091)
Outstanding at 31 December | 13,684,747 | 14,818,060 | 15,979,140
Fair value per share award during the year | € / shares | € 42.59 | € 35.43 | € 33.17

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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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