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Intangible Assets
3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets consisted of:
 
 
As of March 31, 2013
 
As of December 31, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
License agreements
$
251

 
$
42

 
$
209

 
$
257

 
$
39

 
$
218

Customer relationships (a)
163

 
21

 
142

 
86

 
19

 
67

Other
2

 
1

 
1

 
2

 
1

 
1

 
$
416

 
$
64

 
$
352

 
$
345

 
$
59

 
$
286

 
 
 
 
 
 
 
 
 
 
 
 
Unamortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
Goodwill (a)
$
646

 
 
 
 
 
$
375

 
 
 
 
Trademarks (a)
$
558

 
 
 
 
 
$
445

 
 
 
 
__________
(a) 
The increases in carrying amounts primarily relate to the acquisition of Zipcar.

Amortization expense relating to all intangible assets was approximately $5 million and $6 million during first quarter 2013 and 2012, respectively. Based on the Company’s amortizable assets at March 31, 2013, the Company expects amortization expense of approximately $21 million for the remainder of 2013 and approximately $28 million for each of the five fiscal years thereafter.