Redeemable Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Nov. 30, 2010 Series C Preferred Stock [Member] director quarter	Dec. 31, 2010 Series C Preferred Stock [Member]	Dec. 31, 2013 Series C Preferred Stock [Member]	Dec. 31, 2012 Series C Preferred Stock [Member]	Dec. 31, 2011 Series C Preferred Stock [Member]	Jun. 30, 2005 Series B Preferred Stock [Member] director quarter	Dec. 31, 2013 Series B Preferred Stock [Member]	Dec. 31, 2012 Series B Preferred Stock [Member]	Dec. 31, 2011 Series B Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued (shares)		1,000				575,000
Percentage dividend rate on preferred stock	8.625%					6.36%
Cash purchase price of Series C Preferred Stock		$ 1,000
Redemption value per share (usd per share)			$ 1,000,000				$ 1,000
Liquidation value per share (usd per share)				$ 1,000,000
Preferred Stock, Voting Rights, Board of Directors, Election of Additional Members	2					2
Preferred Stock, Voting Rights, Board of Directors, Election of Additional Members, Number of Unpaid Dividend Quarters Trigger	6					6
Authorization and creation of any class of stock must be approved by the holders of Series C Preferred Stock	66.66%					66.66%
Dividend paid on preferred stock			$ 86	$ 86	$ 89		$ 37	$ 37	$ 37