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Debt (Tables)
6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]  
Fair value and carrying value of long-term debt, including current maturities
The approximate fair value and related carrying value of the Company's total long-term debt, including current maturities of long-term debt presented as short-term debt, as of June 30, 2015 and December 31, 2014 were as follows:

In millions
June 30, 2015
 
December 31, 2014
Fair value
$
7,131

 
$
6,431

Carrying value
6,995

 
5,982