A summary of short-term and long-term debt outstanding is as follows:



(in millions)	December 31,
	2012		2011
5.375% Senior Notes, due 2012	$	—	$	400
5.9% Senior Notes, due 2017 ¹	400		399
6.55% Senior Notes, due 2037 ²	399		399
Commercial paper	457		—
Total debt	1,256		1,198
Less: short-term debt including current maturities	457		400
Long-term debt	$	799	$	798


¹	Interest payments are due semiannually on April 15 and October 15, and as of December 31, 2012, the unamortized debt discount is $0.5 million.


²	Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2012, the unamortized debt discount is $1.3 million.