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Property, Plant and Equipment, Net of Accumulated Depreciation
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment, Net of Accumulated Depreciation [Abstract]  
Property, Plant and Equipment, Net of Accumulated Depreciation

7.Property, Plant and Equipment, Net of Accumulated Depreciation



Property, plant and equipment, net of accumulated depreciation follow (in millions):





 

 

 

 

 



 

 

 

 

 



December 31,



2018

 

2017

Land

$

 467 

 

$

 482 

Buildings

 

 5,924 

 

 

 5,864 

Equipment

 

 18,218 

 

 

 16,648 

Construction in progress

 

 2,218 

 

 

 1,832 



 

 26,827 

 

 

 24,826 

Accumulated depreciation

 

 (11,932)

 

 

 (10,809)

Total

$

 14,895 

 

$

 14,017 



Approximately $49 million, $36 million and $23 million of interest costs were capitalized as part of property, plant and equipment, net of accumulated depreciation, in 2018,  2017 and 2016, respectively.

7.Property, Plant and Equipment, Net of Accumulated Depreciation (continued)



Manufacturing equipment includes certain components of production equipment that are constructed of precious metals.  At December 31, 2018 and 2017, the recorded value of precious metals totaled $3 billion in each period.  Depletion expense for precious metals in the years ended December 31, 2018,  2017 and 2016 was $14 million, $13 million and $20 million, respectively.