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Shareholders' Equity - Summary of Remeasurement of Defined Benefit Plans (Detail) - Remeasurement of defined benefit Plans of group companies [member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of revaluation reserve [Line Items] |  |  |
At January 1 | € (1,850) | € (1,669) | € (1,820)
Remeasurements of defined benefit plans | (612) | (134) | 224
Tax effect | 90 | (15) | (175)
Net exchange differences | (25) | (32) | 102
Total remeasurement of defined benefit plans | € (2,397) | € (1,850) | € (1,669)

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- Definition Remeasurements of defined benefit plans. + References No definition available. + Details
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- Definition A component of equity representing the accumulated remeasurements of defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 + Details
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