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PROPERTIES AND ACCUMULATED DEPRECIATION
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
PROPERTIES AND ACCUMULATED DEPRECIATION
PROPERTIES AND ACCUMULATED DEPRECIATION
 
December 31,
(Dollars in millions)
2018
 
2017
Properties
 
 
 
Land
$
158

 
$
161

Buildings
1,385

 
1,325

Machinery and equipment
10,801

 
10,122

Construction in progress
387

 
762

Properties and equipment at cost
$
12,731

 
$
12,370

Less:  Accumulated depreciation
7,131

 
6,763

Net properties
$
5,600

 
$
5,607



Depreciation expense was $437 million, $420 million, and $412 million for 2018, 2017, and 2016, respectively.

Cumulative construction-period interest of $115 million and $111 million, reduced by accumulated depreciation of $54 million and $49 million, is included in net properties at December 31, 2018 and 2017, respectively.

Eastman capitalized $4 million of interest in 2018, $8 million of interest in 2017, and $7 million of interest in 2016.