Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Classification of debt

The following table summarizes the net carrying value of our outstanding debt (in millions):

	September 30, 2013		December 31, 2012
Senior Notes, 5.95%, due 2015	$	35	$	35
Senior Notes, 6.80%, due 2015	340		340
Senior Debentures, 6.85%, due 2037	100		100
Other financing obligations	170		172
Total long-term debt and other financing obligations	645		647
Less: Current portion of debt	5		5
Total long-term debt and other financing obligations, less current maturities	$	640	$	642