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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Oct. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, NET PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment as of October 31, 2021 and 2020, consisted of the following:
 October 31,
 20212020
 (in millions)
Land$61 $58 
Buildings and leasehold improvements1,147 1,055 
Machinery and equipment638 579 
Software221 182 
Total property, plant and equipment2,067 1,874 
Accumulated depreciation and amortization(1,122)(1,029)
Property, plant and equipment, net$945 $845 

During 2021 and 2020 we recorded $2 million and $6 million, respectively, in asset impairments. In 2020 asset impairments related to the shutdown of our sequencer development program. There were no asset impairments in 2019. Depreciation expenses were $122 million in 2021, $119 million in 2020 and $111 million in 2019. In 2021 and 2020 we retired approximately $35 million and $29 million, respectively, of assets, the majority of which were fully depreciated and no longer in use.