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FINANCIAL INSTRUMENTS
 9 Months Ended
Sep. 30, 2012
Financial Instruments [Abstact]  
Financial Instruments Disclosure [Text Block]
FINANCIAL INSTRUMENTS

Investments
The Corporation’s investments in marketable securities are classified as available-for-sale.

Investing Results
Nine Months Ended
In millions
Sep 30, 2012

 
Sep 30, 2011

Proceeds from sales of available-for-sale securities
$
—

 
$
5



Portfolio managers regularly review all of the Corporation’s holdings to determine if any investments are other-than-temporarily impaired. The analysis includes reviewing the amount of the impairment, as well as the length of time it has been impaired. In addition, specific guidelines for each instrument type are followed to determine if an other-than-temporary impairment has occurred. At September 30, 2012 and December 31, 2011, there were no impairment indicators or circumstances that would result in a material adjustment of these investments.

The Corporation’s investments in debt securities had contractual maturities of less than 10 years at September 30, 2012.

Fair Value of Financial Instruments
 
At September 30, 2012
 
At December 31, 2011
In millions
Cost

 
Gain

 
Loss

 
Fair Value

 
Cost

 
Gain

 
Loss

 
Fair Value

Marketable securities - Debt securities (1)
$
5

 
$
—

 
$
—

 
$
5

 
$
3

 
$
—

 
$
—

 
$
3

Long-term debt including debt due within one year
$
(471
)
 
$
—

 
$
(119
)
 
$
(590
)
 
$
(507
)
 
$
—

 
$
(148
)
 
$
(655
)
(1)
Included in “Other investments” in the consolidated balance sheets.

Cost approximates fair value for all other financial instruments.