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Property, Plant and Equipment - Summary of Movements in Leased Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | € 12,062 |
Ending balance | 10,558 | € 12,062
Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 1,813 |
Ending balance | 1,649 | 1,813
Cost [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 3,701 | 3,586
Acquisitions of group companies | 33 |
Additions | 579 | 452
Disposals and other movements | (624) | (420)
Hyperinflationary adjustment | (3) | 23
Currency retranslation | (279) | 60
Ending balance | 3,407 | 3,701
Accumulated depreciation [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (1,888) | (1,712)
Depreciation charge for the year | (457) | (456)
Disposals and other movements | 450 | 304
Hyperinflationary adjustment |  | 9
Currency retranslation | 137 | (33)
Ending balance | (1,758) | (1,888)
Land and buildings [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 1,477 |
Ending balance | 1,328 | 1,477
Land and buildings [Member] | Cost [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 2,874 | 2,770
Acquisitions of group companies | 30 |
Additions | 390 | 278
Disposals and other movements | (436) | (240)
Hyperinflationary adjustment | (3) | 23
Currency retranslation | (216) | 43
Ending balance | 2,639 | 2,874
Land and buildings [Member] | Accumulated depreciation [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (1,397) | (1,241)
Depreciation charge for the year | (315) | (297)
Disposals and other movements | 300 | 154
Hyperinflationary adjustment |  | 9
Currency retranslation | 101 | (22)
Ending balance | (1,311) | (1,397)
Plant and equipment [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 336 |
Ending balance | 321 | 336
Plant and equipment [Member] | Cost [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 827 | 816
Acquisitions of group companies | 3 |
Additions | 189 | 174
Disposals and other movements | (188) | (180)
Currency retranslation | (63) | 17
Ending balance | 768 | 827
Plant and equipment [Member] | Accumulated depreciation [Member] | Assets Under Lease [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (491) | (471)
Depreciation charge for the year | (142) | (159)
Disposals and other movements | 150 | 150
Currency retranslation | 36 | (11)
Ending balance | € (447) | € (491)

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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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired 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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements 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: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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