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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment  
Property, Plant and Equipment

8.  Property, Plant and Equipment

 

 

 

 

 

 

 

 

 

 

December 31,

($ in millions)

    

2016

    

2015

 

 

 

 

 

 

 

Land

 

$
105

 

$
70

Buildings

 

 
1,301

 

 
1,023

Machinery and equipment

 

 
4,723

 

 
3,904

Construction-in-progress

 

 
503

 

 
408

 

 

 
6,632

 

 
5,405

Accumulated depreciation

 

 
(2,245)

 

 
(2,719)

 

 

$
4,387

 

$
2,686

 

Property, plant and equipment are stated at historical or acquired cost. Depreciation expense amounted to $349 million, $247 million and $240 million for the years ended December 31, 2016, 2015 and 2014, respectively.