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INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2013
Intangible Assets [Abstract]  
INTANGIBLE ASSETS DISCLOSURE
INTANGIBLE ASSETS

The following table provides information regarding the Corporation’s intangible assets:

Intangible Assets
At September 30, 2013
 
At December 31, 2012
In millions
Gross
Carrying Amount

 
Accumulated Amortization

 
Net

 
Gross
Carrying Amount

 
Accumulated Amortization

 
Net

Intangible assets with finite lives:
 
 
 
 
 
 
 
 
 
 
 
Licenses and intellectual property
$
33

 
$
(33
)
 
$
—

 
$
33

 
$
(33
)
 
$
—

Software
48

 
(40
)
 
8

 
46

 
(39
)
 
7

Total intangible assets
$
81

 
$
(73
)
 
$
8

 
$
79

 
$
(72
)
 
$
7



Amortization expense for software, which is included in "Cost of sales" in the consolidated statements of income, was less than $1 million in the third quarter of 2013 and $1 million in the third quarter of 2012. Amortization expense for software was $1 million for the nine months ended September 30, 2013 and $2 million for the nine months ended September 30, 2012.

Total estimated amortization expense for 2013 and the five succeeding fiscal years is as follows:

Estimated Amortization Expense
In millions
2013
$
2

2014
$
2

2015
$
2

2016
$
1

2017
$
1

2018
$
—