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Fair Value of Financial Investments and Liabilities (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income from financial investments, net and impairment charges          
Equity investments (loss) income, net     $ (2,000,000) $ 7,000,000  
Income from other investments, net   1,000,000   1,000,000  
Total income from financial investments 3,000,000 5,000,000 2,000,000 15,000,000  
Estimated market value of long-term and short-term debt 3,800,000,000   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   3,400,000,000
Private equity funds
          
Income from financial investments, net and impairment charges          
Realized gains from private equity funds $ 3,000,000 $ 4,000,000 $ 4,000,000 $ 7,000,000