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PROPERTY, PLANT & EQUIPMENT | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT & EQUIPMENT | PROPERTY, PLANT & EQUIPMENTThe major classes of depreciable assets are as follows:
|  | December 31,
In millions |  | 2021 |  | 2020
Machinery and equipment |  | $ | 1,433 |  |  | $ | 1,375 |
Buildings and improvements |  | 785 |  |  | 801 |
Land and improvements |  | 96 |  |  | 98 |
Construction in progress |  | 89 |  |  | 99 |
Property, plant and equipment |  | 2,403 |  |  | 2,373 |
Less: accumulated depreciation |  | (906) |  |  | (772) |
Total |  | $ | 1,497 |  |  | $ | 1,601 |
The estimated useful lives of property, plant and equipment are as follows:
|  | Years
Land improvements |  | 10 to 20
Building and improvements |  | 20 to 40
Machinery and equipment |  | 3 to 15
Depreciation expense was $198 million, $183 million, and $158 million for 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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