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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | € 10,028 | € 9,365 | [1] |  |
Acquisitions and other increases | 1,748 | 1,504 |  | € 1,310 |
Property, plant and equipment, ending balance | 9,869 | 10,028 |  | 9,365 | [1]
Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 24,810 | 23,169 |  | 23,568 |
Changes in scope of consolidation | (2,104) | 30 |  | 10 |
Acquisitions and other increases | 1,748 | 1,504 |  | 1,310 |
Disposals and other decreases | (559) | (314) |  | (487) |
Currency translation differences | 347 | 443 |  | (711) |
Transfers | (318) | (22) |  | (521) |
Property, plant and equipment, ending balance | 23,924 | 24,810 |  | 23,169 |
Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (14,782) | (13,804) |  | (13,851) |
Changes in scope of consolidation | 1,533 |  |  |  |
Disposals and other decreases | 518 | 299 |  | 460 |
Currency translation differences | (138) | (208) |  | 345 |
Transfers | 142 | 35 |  | 428 |
Depreciation expense | (1,142) | (1,065) |  | (1,143) |
Impairment losses, net of reversals | (186) | (39) |  | (43) |
Property, plant and equipment, ending balance | (14,055) | (14,782) |  | (13,804) |
Land |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 231 | 226 |  |  |
Property, plant and equipment, ending balance | 227 | 231 |  | 226 |
Land | Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 240 | 236 |  | 255 |
Changes in scope of consolidation | (17) | 0 |  | 0 |
Acquisitions and other increases | 0 | 0 |  | 0 |
Disposals and other decreases | (1) | (3) |  | (11) |
Currency translation differences | 17 | 6 |  | (13) |
Transfers | (2) | 1 |  | 5 |
Property, plant and equipment, ending balance | 237 | 240 |  | 236 |
Land | Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (9) | (10) |  | (11) |
Changes in scope of consolidation | 0 |  |  |  |
Disposals and other decreases | 0 | 0 |  | 1 |
Currency translation differences | 0 | 0 |  | 0 |
Transfers | 0 | 1 |  | 0 |
Depreciation expense | 0 | 0 |  | 0 |
Impairment losses, net of reversals | (1) | 0 |  | 0 |
Property, plant and equipment, ending balance | (10) | (9) |  | (10) |
Buildings |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 2,980 | 2,930 |  |  |
Property, plant and equipment, ending balance | 3,103 | 2,980 |  | 2,930 |
Buildings | Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 7,170 | 6,828 |  | 7,282 |
Changes in scope of consolidation | (294) | 11 |  | 6 |
Acquisitions and other increases | 11 | 10 |  | 16 |
Disposals and other decreases | (161) | (75) |  | (173) |
Currency translation differences | 122 | 169 |  | (264) |
Transfers | 480 | 227 |  | (39) |
Property, plant and equipment, ending balance | 7,328 | 7,170 |  | 6,828 |
Buildings | Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (4,190) | (3,898) |  | (4,065) |
Changes in scope of consolidation | 201 |  |  |  |
Disposals and other decreases | 133 | 74 |  | 168 |
Currency translation differences | (52) | (80) |  | 127 |
Transfers | 89 | 23 |  | 252 |
Depreciation expense | (356) | (306) |  | (356) |
Impairment losses, net of reversals | (50) | (3) |  | (24) |
Property, plant and equipment, ending balance | (4,225) | (4,190) |  | (3,898) |
Machinery and equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 3,308 | 3,335 |  |  |
Property, plant and equipment, ending balance | 3,211 | 3,308 |  | 3,335 |
Machinery and equipment | Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 11,648 | 11,127 |  | 11,053 |
Changes in scope of consolidation | (1,480) | 15 |  | 3 |
Acquisitions and other increases | 54 | 51 |  | 40 |
Disposals and other decreases | (240) | (153) |  | (177) |
Currency translation differences | 144 | 155 |  | (276) |
Transfers | 722 | 453 |  | 484 |
Property, plant and equipment, ending balance | 10,848 | 11,648 |  | 11,127 |
Machinery and equipment | Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (8,340) | (7,792) |  | (7,660) |
Changes in scope of consolidation | 1,202 |  |  |  |
Disposals and other decreases | 201 | 149 |  | 166 |
Currency translation differences | (69) | (99) |  | 169 |
Transfers | 49 | 16 |  | 150 |
Depreciation expense | (622) | (592) |  | (605) |
Impairment losses, net of reversals | (58) | (22) |  | (12) |
Property, plant and equipment, ending balance | (7,637) | (8,340) |  | (7,792) |
Fixtures, fittings and other |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 540 | 543 |  |  |
Property, plant and equipment, ending balance | 500 | 540 |  | 543 |
Fixtures, fittings and other | Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 2,655 | 2,524 |  | 2,587 |
Changes in scope of consolidation | (163) | 2 |  | 1 |
Acquisitions and other increases | 41 | 39 |  | 46 |
Disposals and other decreases | (155) | (80) |  | (123) |
Currency translation differences | 29 | 34 |  | (67) |
Transfers | 108 | 136 |  | 80 |
Property, plant and equipment, ending balance | 2,515 | 2,655 |  | 2,524 |
Fixtures, fittings and other | Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (2,115) | (1,981) |  | (1,984) |
Changes in scope of consolidation | 130 |  |  |  |
Disposals and other decreases | 153 | 75 |  | 117 |
Currency translation differences | (22) | (29) |  | 49 |
Transfers | 5 | (11) |  | 26 |
Depreciation expense | (164) | (167) |  | (182) |
Impairment losses, net of reversals | (2) | (2) |  | (7) |
Property, plant and equipment, ending balance | (2,015) | (2,115) |  | (1,981) |
Property, plant and equipment in process |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 2,969 | 2,331 |  |  |
Property, plant and equipment, ending balance | 2,828 | 2,969 |  | 2,331 |
Property, plant and equipment in process | Gross value |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | 3,097 | 2,454 |  | 2,391 |
Changes in scope of consolidation | (150) | 2 |  | 0 |
Acquisitions and other increases | 1,642 | 1,404 |  | 1,208 |
Disposals and other decreases | (2) | (3) |  | (3) |
Currency translation differences | 35 | 79 |  | (91) |
Transfers | (1,626) | (839) |  | (1,051) |
Property, plant and equipment, ending balance | 2,996 | 3,097 |  | 2,454 |
Property, plant and equipment in process | Accumulated depreciation & impairment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment, beginning balance | (128) | (123) |  | (131) |
Changes in scope of consolidation | 0 |  |  |  |
Disposals and other decreases | 31 | 1 |  | 8 |
Currency translation differences | 5 | 0 |  | 0 |
Transfers | (1) | 6 |  | 0 |
Depreciation expense | 0 | 0 |  | 0 |
Impairment losses, net of reversals | (75) | (12) |  | 0 |
Property, plant and equipment, ending balance | € (168) | € (128) |  | € (123) |
[1] | Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.

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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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