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Acquisitions and Disposals - Summary of Net Assets Acquired and Total Payment for Acquisition (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Detailed Information about Business Combination [Line Items] |  |  |
Intangible assets | € 859 |  |
Other non-current assets | 45 |  |
Trade and other receivables | 25 |  |
Other current assets | 45 |  |
Non-current liabilities | (134) |  |
Current liabilities | (25) |  |
Net assets acquired | 815 | € 2,423 | € 929
Non-controllinginterest | (17) | (50) |
Goodwill | 17,341 | 16,881 |
Exchange rate gain/ (loss) on cash flow hedges | (100) | 51 | 14
Cash consideration | 1,172 |  |
Deferred consideration | 22 |  |
Total consideration | 1,194 | 4,963 | 2,083
Subsidiaries [member] |  |  |
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |
Goodwill | € 496 | € 2,539 | € 1,140

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_135_a&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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