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Net Intangible Assets
 12 Months Ended
Dec. 31, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Net Intangible Assets
NET INTANGIBLE ASSETS

Our intangible assets are comprised primarily of license and advertising agreements, land rights, patents, customer contracts, and technology, and each is amortized over its determinable life.

The components of net intangible assets were as follows (in millions):
 
December 31, 2012
 
December 31, 2011
 
Gross
 Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Automotive Sector
 
 
 
 
 
 
 
 
 
 
 
License and advertising agreements
$
118

 
$
(54
)
 
$
64

 
$
118

 
$
(47
)
 
$
71

Land rights
23

 
(8
)
 
15

 
23

 
(8
)
 
15

Patents
27

 
(20
)
 
7

 
26

 
(17
)
 
9

Other
11

 
(10
)
 
1

 
27

 
(22
)
 
5

Total Automotive sector
$
179

 
$
(92
)
 
$
87

 
$
194

 
$
(94
)
 
$
100



Amortization periods primarily range from 5 years to 25 years for our license and advertising agreements, from
40 years to 50 years for our land rights, and primarily from 7 years to 17 years for our patents. Our other intangibles (primarily customer contracts and technology) have various amortization periods.

Pre-tax amortization expense for the periods ending December 31 was as follows (in millions):
 
2012
 
2011
 
2010
Pre-tax amortization expense
$
10

 
$
12

 
$
97



Amortization for current intangible assets is forecasted to be approximately $10 million in 2013 and each year thereafter.