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Long-Term Debt	9 Months Ended
Long-Term Debt	Sep. 30, 2012
Debt Disclosure [Abstract]
Long-term Debt	Long-Term Debt The net carrying value of long-term debt, excluding amounts reclassified from short-term, at September 30, 2012 and December 31, 2011 is $4.1 billion. The fair value of long-term debt at September 30, 2012 and December 31, 2011 is $4.9 billion. Long-term debt primarily includes corporate issued bonds. The fair value of corporate bonds is $4.0 billion and classified as Level 1. The fair value of the other bonds is $0.9 billion and classified as Level 2.