Long-Term Debt	3 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The net carrying value of long-term debt, excluding amounts reclassified from short-term, at March 31, 2013, and December 31, 2012 is $6.0 billion and $6.1 billion, respectively. The fair value of long-term debt at March 31, 2013, and December 31, 2012 is $6.6 billion and $6.8 billion, respectively. Long-term debt primarily includes corporate issued bonds. The fair value of corporate bonds is $5.8 billion and classified as Level 1. The fair value of the other bonds is $0.8 billion and classified as Level 2.

Long-Term Debt

3 Months Ended

Mar. 31, 2013

The net carrying value of long-term debt, excluding amounts reclassified from short-term, at March 31, 2013, and December 31, 2012 is $6.0 billion and $6.1 billion, respectively. The fair value of long-term debt at March 31, 2013, and December 31, 2012 is $6.6 billion and $6.8 billion, respectively. Long-term debt primarily includes corporate issued bonds. The fair value of corporate bonds is $5.8 billion and classified as Level 1. The fair value of the other bonds is $0.8 billion and classified as Level 2.