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Property, Plant and Equipment - Summary of Movements in Property, Plant and Equipment (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | € 11,673 |  |
Depreciation charge for the year | 1,173 | € 1,154 | € 1,097
Ending balance | 10,411 | 11,673 |
Includes payments on account and assets in course of construction | 1,065 | 1,425 |
Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | 21,207 | 19,917 |
Acquisitions of group companies | 42 | 13 |
Disposals of group companies | (94) | (12) |
Additions | 1,532 | 1,911 |
Disposals | (459) | (605) |
Currency retranslation | (1,667) | 87 |
Reclassification as held for sale | (1,163) | (104) |
Ending balance | 19,398 | 21,207 | 19,917
Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | (9,534) | (8,859) |
Disposals of group companies | 30 | 8 |
Depreciation charge for the year | (1,173) | (1,154) |
Disposals | 414 | 388 |
Currency retranslation | 643 | (10) |
Reclassification as held for sale | 633 | 93 |
Ending balance | (8,987) | (9,534) | (8,859)
Land and buildings [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | 3,262 |  |
Ending balance | 3,033 | 3,262 |
Includes payments on account and assets in course of construction | 93 | 189 |
Land and buildings [Member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | 4,745 | 4,551 |
Acquisitions of group companies | 13 |  |
Disposals of group companies | (16) | (1) |
Additions | 314 | 358 |
Disposals | (19) | (84) |
Currency retranslation | (384) | 23 |
Reclassification as held for sale | (191) | (102) |
Ending balance | 4,462 | 4,745 | 4,551
Land and buildings [Member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | (1,483) | (1,443) |
Disposals of group companies | 1 | 1 |
Depreciation charge for the year | (142) | (149) |
Disposals | 14 | 56 |
Currency retranslation | 100 | 5 |
Reclassification as held for sale | 81 | 47 |
Ending balance | (1,429) | (1,483) | (1,443)
Plant and equipment [member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | 8,411 |  |
Ending balance | 7,378 | 8,411 |
Includes payments on account and assets in course of construction | 972 | 1,236 |
Plant and equipment [member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | 16,462 | 15,366 |
Acquisitions of group companies | 29 | 13 |
Disposals of group companies | (78) | (11) |
Additions | 1,218 | 1,553 |
Disposals | (440) | (521) |
Currency retranslation | (1,283) | 64 |
Reclassification as held for sale | (972) | (2) |
Ending balance | 14,936 | 16,462 | 15,366
Plant and equipment [member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Beginning balance | (8,051) | (7,416) |
Disposals of group companies | 29 | 7 |
Depreciation charge for the year | (1,031) | (1,005) |
Disposals | 400 | 332 |
Currency retranslation | 543 | (15) |
Reclassification as held for sale | 552 | 46 |
Ending balance | € (7,558) | € (8,051) | € (7,416)

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_iii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The decrease in property, plant and equipment through 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]; Property, plant and equipment; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_ii&doctype=Standard -URIDate 2016-03-31 + Details
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