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Employees - Summary of Status of Performance Share Plans and Related Changes (Detail) | 12 Months Ended
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Dec. 31, 2020 € / shares | Dec. 31, 2019 € / shares | Dec. 31, 2018 € / shares
Disclosure of Share Based Compensation Plans [Line Items] |  |  |
Fair value per share award during the year | € 43.91 | € 48.22 | € 42.44
Performance share plans [Member] |  |  |
Disclosure of Share Based Compensation Plans [Line Items] |  |  |
Outstanding at 1 January | 11,137,801 | 13,634,518 | 13,684,747
Awarded | 4,395,633 | 4,538,771 | 6,870,882
Vested | (3,240,738) | (6,041,011) | (5,854,388)
Forfeited | (921,260) | (994,477) | (1,066,723)
Outstanding at 31 December | 11,371,436 | 11,137,801 | 13,634,518

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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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