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PROPERTY, PLANT & EQUIPMENT
12 Months Ended
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 millions20212020
Machinery and equipment$1,433 $1,375 
Buildings and improvements785 801 
Land and improvements96 98 
Construction in progress89 99 
Property, plant and equipment2,403 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.