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Goodwill and Intangible Assets - Summary of Net Book Value Goodwill and Intangible Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | € 27,433 |
Ending balance | 28,401 | € 27,433
Cost [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 30,793 | 28,179
Acquisitions of group companies | 5,267 | 2,287
Disposals of group companies |  | (85)
Reclassification to held for sale | (2,311) | (55)
Reclassification from held for sale | 28 |
Additions | 154 | 233
Disposals | (79) | (43)
Currency retranslation | (1,946) | 277
Ending balance | 31,906 | 30,793
Accumulated depreciation, amortisation and impairment [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (3,360) | (3,120)
Amortisation/impairment for the year | (365) | (310)
Disposals | 79 | 43
Currency retranslation | 141 | 27
Ending balance | (3,505) | (3,360)
Goodwill [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 17,624 |
Ending balance | 16,881 | 17,624
Goodwill [member] | Cost [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 18,789 | 17,378
Acquisitions of group companies | 2,557 | 1,140
Disposals of group companies |  | (2)
Reclassification to held for sale | (2,228) | (55)
Reclassification from held for sale | 28 |
Currency retranslation | (1,104) | 328
Ending balance | 18,042 | 18,789
Goodwill [member] | Accumulated depreciation, amortisation and impairment [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (1,165) | (1,165)
Currency retranslation | 4 |
Ending balance | (1,161) | (1,165)
Indefinite-life intangible assets [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 8,345 |
Ending balance | 10,261 | 8,345
Indefinite-life intangible assets [member] | Cost [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 8,358 | 7,444
Acquisitions of group companies | 2,622 | 911
Disposals of group companies |  | (83)
Reclassification to held for sale | (82) |
Additions |  | 2
Currency retranslation | (623) | 84
Ending balance | 10,275 | 8,358
Indefinite-life intangible assets [member] | Accumulated depreciation, amortisation and impairment [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (13) | (13)
Currency retranslation | (1) |
Ending balance | (14) | (13)
Finite-life intangible assets [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 1,094 |
Ending balance | 862 | 1,094
Finite-life intangible assets [Member] | Cost [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 2,578 | 2,538
Reclassification to held for sale | (1) |
Additions | 153 | 225
Disposals | (78) | (42)
Currency retranslation | (153) | (143)
Ending balance | 2,499 | 2,578
Finite-life intangible assets [Member] | Accumulated depreciation, amortisation and impairment [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (1,484) | (1,269)
Amortisation/impairment for the year | (324) | (291)
Disposals | 78 | 42
Currency retranslation | 93 | 34
Ending balance | (1,637) | (1,484)
Software [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 370 |
Ending balance | 397 | 370
Software [Member] | Cost [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 1,068 | 819
Acquisitions of group companies | 88 | 236
Additions | 1 | 6
Disposals | (1) | (1)
Currency retranslation | (66) | 8
Ending balance | 1,090 | 1,068
Software [Member] | Accumulated depreciation, amortisation and impairment [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (698) | (673)
Amortisation/impairment for the year | (41) | (19)
Disposals | 1 | 1
Currency retranslation | 45 | (7)
Ending balance | € (693) | € (698)

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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The decrease in intangible assets and goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The decrease in intangible assets and goodwill resulting from disposals. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_vii&doctype=Standard -URIDate 2016-03-31 + Details
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