Fair Value of Financial Investments and Liabilities (Details 2) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income from financial investments, net and impairment charges
Equity investment (loss) income, net	$ 6,000,000	$ (2,000,000)	$ 13,000,000
Income from other investments, net			1,000,000
Total income from financial investments	6,000,000	2,000,000	21,000,000
Estimated market value of long-term and short-term debt		3,700,000,000		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		$ 4,000,000	$ 7,000,000