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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 |

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