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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Oct. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT, NET | PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment as of October 31, 2020 and 2019, consisted of the following:
| October 31,
| 2020 |  | 2019
| (in millions)
Land | $ | 58 |  |  | $ | 57 |
Buildings and leasehold improvements | 1,055 |  |  | 1,012 |
Machinery and equipment | 579 |  |  | 546 |
Software | 182 |  |  | 160 |
Total property, plant and equipment | 1,874 |  |  | 1,775 |
Accumulated depreciation and amortization | (1,029) |  |  | (925) |
Property, plant and equipment, net | $ | 845 |  |  | $ | 850 |
In 2020 we recorded $6 million in asset impairments related to the shutdown of our sequencer development program. There were no asset impairments in 2019 and less than $1 million in asset impairments in 2018. Depreciation expenses were $119 million in 2020, $111 million in 2019 and $102 million in 2018. In 2020 and 2019 we retired approximately $29 million and $23 million, respectively, of fully depreciated assets that were no longer in use.

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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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