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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 31Estimated Useful 
Lives (Years)		20202019
In millions
Land and land improvements
0-25
$2,011 $2,177 
Buildings
5-50
4,976 4,742 
Machinery and equipment
3-25
42,108 40,651 
Other property
3-50
5,626 5,354 
Construction in progress 1
— 1,604 1,986 
Total property $56,325 $54,910 
1.The decrease is primarily related to the Company proactively reducing capital spending in 2020 to focus on cash and maintaining financial strength during the COVID-19 pandemic.
 
In millions202020192018
Depreciation expense$2,092 $2,156 $2,174 
Capitalized interest$64 $80 $88