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Fair Value of Financial Investments (Details 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income from financial investments, net and impairment charges          
Equity investments income (loss), net $ 2   $ 2 $ (2)  
Total income from financial investments, net 4 $ 3 6 2  
Estimated market value of long-term and short-term debt 3,700   3,700   $ 3,700
Aggregate carrying value of long-term and short-term debt 3,400   3,400   $ 3,400
Private equity funds          
Income from financial investments, net and impairment charges          
Realized gains from private equity funds $ 2 $ 3 $ 4 $ 4