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PROPERTY
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property PROPERTY
The following table provides a breakdown of property:

Property at Dec 31 Estimated Useful Lives (Years)
In millions20202019
Land and land improvements
0-25
$186 $258 
Buildings
5-50
421 408 
Machinery and equipment
3-20
5,974 6,097 
Other property
3-30
372 357 
Construction in progress— 136 127 
Total property$7,089 $7,247 

The following table provides information regarding depreciation expense and capitalized interest:

In millions202020192018
Depreciation expense $181 $175 $179 
Capitalized interest$6 $8 $7