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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, Plant and Equipment, Net.
Property, plant and equipment, net consists of the following:
 
 
 
December 31,
  
Useful Life
 
2014
 
2013
 
(in years)
 
(in millions)
Land
 
 
$
489

 
$
465

Buildings and improvements
4 - 40
 
2,353

 
2,107

Machinery, equipment and furniture
1 - 40
 
5,594

 
5,068

Assets leased to others
15 - 39
 
3,546

 
3,017

Construction in progress
 
 
584

 
632

 
 
 
12,566

 
11,289

Less: Accumulated depreciation and amortization
 
 
(3,611
)
 
(3,212
)
Property, plant and equipment, net
 
 
$
8,955

 
$
8,077


Assets leased to others are related to our Railcar and Real Estate segments. Included in assets leased to others in the table above are our Railcar segment's railcars for lease in the amount of approximately $3.1 billion and $2.6 billion as of December 31, 2014 and 2013, respectively. Additionally, included in assets leased to others in the table above are our Real Estate segment's properties on lease in the amount of $450 million and $462 million as of December 31, 2014 and 2013, respectively. Aggregate accumulated depreciation pertaining to assets leased to others is $957 million and $896 million as of December 31, 2014 and 2013, respectively.
Depreciation and amortization expense related to property, plant and equipment for the years ended December 31, 2014, 2013 and 2012 was $700 million, $622 million and $529 million, respectively.