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Fixed Assets
12 Months Ended
Dec. 31, 2012
Fixed Assets [Abstract]  
Fixed Assets
 
December 31,
 
2012
 
2011
Land
$
22,064

 
$
23,852

Buildings
349,061

 
335,625

Machinery and equipment
1,299,475

 
1,278,332

 
1,670,600

 
1,637,809

Accumulated depreciation
(1,285,223
)
 
(1,233,663
)
Property, plant and equipment, net
$
385,377

 
$
404,146

 
 
 
 
Rental property and equipment
$
580,243

 
$
649,343

Accumulated depreciation
(339,051
)
 
(390,632
)
Rental property and equipment, net
$
241,192

 
$
258,711


Depreciation expense was $211 million, $214 million and $243 million for the years ended December 31, 2012, 2011 and 2010, respectively. In 2012, we recorded asset impairment charges of $7 million to write down the carrying value of certain assets of IMS (see Note 18). In 2011, we recorded asset impairment charges of $13 million associated with a restructuring program (see Note 13).