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Debt
3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]  
Debt
Debt
 
The Company uses proceeds from the commercial paper market from time to time in order to meet short-term working capital needs and to retire other debt obligations.  At March 31, 2014, the Company had $374 million in commercial paper outstanding compared to no commercial paper outstanding at December 31, 2013. The weighted average commercial paper outstanding for the three months ended March 31, 2014 was $204 million. The weighted average interest rate of the commercial paper outstanding for the three months ended March 31, 2014 was 0.32%.