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PROPERTY, PLANT & EQUIPMENT
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT & EQUIPMENT PROPERTY, PLANT & EQUIPMENT
The major classes of depreciable assets are as follows:
 December 31,
In millions20222021
Machinery and equipment$1,474 $1,433 
Buildings and improvements783 785
Land and improvements100 96 
Construction in progress122 89 
Property, plant and equipment2,479 2,403 
Less: accumulated depreciation(1,050)(906)
Property, plant and equipment, net$1,429 $1,497 
 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 $182 million, $198 million, and $183 million for 2022, 2021 and 2020, respectively.