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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment  
Property, Plant and Equipment

8.     Property, Plant and Equipment

 

 

 

 

 

 

 

 

 

June 30,

 

December 31,

 

($ in millions)

2016

    

2015

 

 

 

 

 

 

 

 

Land

$
101

 

$
70

 

Buildings

 
1,201

 

 
1,023

 

Machinery and equipment

 
4,722

 

 
3,904

 

Construction-in-progress

 
508

 

 
408

 

 

 
6,532

 

 
5,405

 

Accumulated depreciation

 
(2,136)

 

 
(2,719)

 

 

$
4,396

 

$
2,686

 

 

Property, plant and equipment are stated at historical or acquired cost. Depreciation expense amounted to $68 million and $133 million for the three and six months ended June 30, 2016, respectively, and $62 million and $121 million for the comparable periods in 2015, respectively.