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Fair Value of Financial Investments and Liabilities (Details 2) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Income from financial investments, net and impairment charges      
Equity investments (loss) income, net $ (2,000,000) $ 7,000,000  
Total income from financial investments (1,000,000) 10,000,000  
Estimated market value of long-term and short-term debt 3,800,000,000   3,700,000,000
Aggregate carrying value of long-term and short-term debt 3,400,000,000   3,400,000,000
Private equity funds
     
Income from financial investments, net and impairment charges      
Realized gains from private equity funds $ 1,000,000 $ 3,000,000