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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment | The following table shows the respective useful lives for property, plant and equipment:
| Useful life
Buildings and improvements | 10 to 40 years
Machinery and other equipment |
Machinery and equipment | 5 to 20 years
Furniture and vehicles | 5 to 10 years
Computer hardware | 3 to 7 years
The following table summarizes the movements of property, plant & equipment in 2020:
($ millions) | Land |  | Buildings & improvements |  | Construction in progress |  | Machinery & other equipment |  | Total
Cost |  |  |  |  |  |  |  |  |
January 1, 2020 | 33 |  |  | 1,628 |  |  | 755 |  |  | 2,906 |  |  | 5,322 |
Additions(1) | 2 |  |  | 7 |  |  | 479 |  |  | 74 |  |  | 562 |
Disposals and derecognitions(2) | — |  |  | (7) |  |  | (10) |  |  | (105) |  |  | (122) |
Reclassifications for assets placed in service | — |  |  | 215 |  |  | (705) |  |  | 490 |  |  | — |
Other reclassifications | — |  |  | 11 |  |  | — |  |  | (11) |  |  | — |
Currency translation effects | — |  |  | 30 |  |  | 54 |  |  | 71 |  |  | 155 |
December 31, 2020 | 35 |  |  | 1,884 |  |  | 573 |  |  | 3,425 |  |  | 5,917 |
Accumulated depreciation |  |  |  |  |  |  |  |  |
January 1, 2020 | — |  |  | (618) |  |  | (8) |  |  | (1,583) |  |  | (2,209) |
Depreciation charge | — |  |  | (80) |  |  | — |  |  | (213) |  |  | (293) |
Impairment charge | — |  |  | — |  |  | — |  |  | (6) |  |  | (6) |
Disposals and derecognitions(2) | — |  |  | 4 |  |  | — |  |  | 70 |  |  | 74 |
Other reclassifications | — |  |  | (7) |  |  | — |  |  | 7 |  |  | — |
Currency translation effects | — |  |  | (15) |  |  | — |  |  | (43) |  |  | (58) |
December 31, 2020 | — |  |  | (716) |  |  | (8) |  |  | (1,768) |  |  | (2,492) |
Net book value at December 31, 2020 | 35 |  |  | 1,168 |  |  | 565 |  |  | 1,657 |  |  | 3,425 |
(1)Includes $83 million in non-cash additions. (2)Derecognition of assets that are no longer used and are not considered to have a significant disposal value or other alternative use. As of December 31, 2020, commitments for purchases of property, plant & equipment were $136 million. There were no capitalized borrowing costs. The following table summarizes the movements of property, plant and equipment in 2019:
($ millions) | Land |  | Buildings & improvements |  | Construction in progress |  | Machinery & other equipment |  | Total
Cost |  |  |  |  |  |  |  |  |
January 1, 2019 | 60 |  |  | 1,527 |  |  | 657 |  |  | 2,646 |  |  | 4,890 |
Additions(1) | — |  |  | 11 |  |  | 514 |  |  | 82 |  |  | 607 |
Impact of business combinations | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Disposals and derecognitions(2) | — |  |  | (17) |  |  | (1) |  |  | (161) |  |  | (179) |
Transfers with former parent | — |  |  | 4 |  |  | 2 |  |  | 29 |  |  | 35 |
Reclassifications for assets placed in service | — |  |  | 104 |  |  | (417) |  |  | 313 |  |  | — |
Other reclassifications | (27) |  |  | — |  |  | — |  |  | — |  |  | (27) |
Currency translation effects | — |  |  | (1) |  |  | — |  |  | (4) |  |  | (5) |
December 31, 2019 | 33 |  |  | 1,628 |  |  | 755 |  |  | 2,906 |  |  | 5,322 |
Accumulated depreciation |  |  |  |  |  |  |  |  |
January 1, 2019 | (7) |  |  | (558) |  |  | (7) |  |  | (1,518) |  |  | (2,090) |
Depreciation charge | — |  |  | (73) |  |  | — |  |  | (194) |  |  | (267) |
Impairment charge | — |  |  | — |  |  | (1) |  |  | (7) |  |  | (8) |
Disposals and derecognitions(2) | — |  |  | 14 |  |  | — |  |  | 151 |  |  | 165 |
Transfers with former parent | — |  |  | (2) |  |  | — |  |  | (15) |  |  | (17) |
Other reclassifications | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |
Currency translation effects | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
December 31, 2019 | — |  |  | (618) |  |  | (8) |  |  | (1,583) |  |  | (2,209) |
Net book value at December 31, 2019 | 33 |  |  | 1,010 |  |  | 747 |  |  | 1,323 |  |  | 3,113 |
(1)Includes $56 million in non-cash additions. (2)Derecognition of assets that are no longer used and are not considered to have a significant disposal value or other alternative use. As of December 31, 2019, commitments for purchases of property, plant & equipment were $212 million. There were no capitalized borrowing costs.

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- Definition The disclosure of detailed information about property, plant and equipment. [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 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73&doctype=Standard -URIDate 2020-01-01 + Details
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