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Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Short-term and long-term debt outstanding
A summary of short-term and long-term debt outstanding is as follows:
(in millions)
December 31,
 
2014
 
2013
5.9% Senior Notes, due 2017 1
$
400

 
$
400

6.55% Senior Notes, due 2037 2
399

 
399

Commercial paper
—

 
—

Total debt
799

 
799

Less: short-term debt including current maturities
—

 
—

Long-term debt
$
799

 
$
799

1 
Interest payments are due semiannually on April 15 and October 15, and as of December 31, 2014, the unamortized debt discount is less than $1 million.
2 
Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2014, the unamortized debt discount is approximately $1 million.