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PROPERTIES AND ACCUMULATED DEPRECIATION
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
PROPERTIES AND ACCUMULATED DEPRECIATION
PROPERTIES AND ACCUMULATED DEPRECIATION
 
December 31,
(Dollars in millions)
2019
 
2018
Properties
 
 
 
Land
$
158

 
$
158

Buildings
1,430

 
1,385

Machinery and equipment
10,960

 
10,801

Construction in progress
356

 
387

Properties and equipment at cost
$
12,904

 
$
12,731

Less:  Accumulated depreciation
7,333

 
7,131

Net properties
$
5,571

 
$
5,600



Depreciation expense was $450 million, $437 million, and $420 million for 2019, 2018, and 2017, respectively.

Cumulative construction-period interest of $98 million and $115 million, reduced by accumulated depreciation of $38 million and $54 million, is included in net properties at December 31, 2019 and 2018, respectively.

Eastman capitalized $4 million of interest in 2019, $4 million of interest in 2018, and $8 million of interest in 2017.