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Property, Plant and Equipment, Net
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment, Net
Property, Plant and Equipment, Net.
Property, plant and equipment, net consists of the following:
  
Useful Life
 
March 31, 2015
 
December 31, 2014
 
(in years)
 
(in millions)
Land
 
 
$
499

 
$
489

Buildings and improvements
4 - 40
 
2,358

 
2,353

Machinery, equipment and furniture
1 - 40
 
5,688

 
5,594

Assets leased to others
15 - 39
 
3,686

 
3,546

Construction in progress
 
 
647

 
584

 
 
 
12,878

 
12,566

Less: Accumulated depreciation and amortization
 
 
(3,677
)
 
(3,611
)
Property, plant and equipment, net
 
 
$
9,201

 
$
8,955


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 $3.3 billion and $3.1 billion as of March 31, 2015 and December 31, 2014, 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 $434 million and $450 million as of March 31, 2015 and December 31, 2014, respectively. Aggregate accumulated depreciation pertaining to assets leased to others is $978 million and $957 million as of March 31, 2015 and December 31, 2014, respectively.
Depreciation and amortization expense related to property, plant and equipment for the three months ended March 31, 2015 and 2014 was $182 million and $167 million, respectively.