Equity (Schedule Of Preferred Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items]
Preferred stock	$ 1,255	$ 1,255
Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock	1,021	1,021
Preferred stock par value (per share)	$ 0.01	$ 0.01
Liquidation preference (per share)	$ 25	$ 25
Preferred Stock, Shares Authorized	160,870,560	160,870,560
Preferred Stock, Shares Issued and Outstanding	40,870,560	40,870,560
Preferred Stock, Dividend Rate, Percentage	8.50%	8.50%
Preferred Stock, Dividend Payment Rate, Variable	Three month LIBOR + 6.243%	Three month LIBOR + 6.243%
Series G Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock	$ 234	$ 234
Preferred stock par value (per share)	$ 0.01	$ 0.01
Liquidation preference (per share)	$ 1,000	$ 1,000
Preferred Stock, Shares Authorized	2,576,601	2,576,601
Preferred Stock, Shares Issued and Outstanding	2,576,601	2,576,601
Preferred Stock, Dividend Rate, Percentage	7.00%	7.00%