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Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities, Debt	$ 32us-gaap_TradingSecuritiesDebt	$ 0us-gaap_TradingSecuritiesDebt
Trading Securities, Equity	13us-gaap_TradingSecuritiesEquity	0us-gaap_TradingSecuritiesEquity
Trading Securities	45us-gaap_TradingSecurities	0us-gaap_TradingSecurities
Maximum [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ 1

Amount of investments in debt securities classified as trading.

Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.