Preferred Stock (Schedule Of Preferred Stock) (Details) (USD $)	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Apr. 23, 2015	Apr. 10, 2015
Schedule of Capitalization, Equity [Line Items]
Preferred stock	$ 1,255,000,000	$ 1,255,000,000
Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock	1,021,000,000	1,021,000,000
Preferred stock par value (per share)	$ 0.01	$ 0.01
Liquidation preference (per share)	$ 25	$ 25
Preferred Stock, Shares Authorized	40,870,560	40,870,560
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%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				13,000,000
Stock Repurchase Program, Repurchase Price per Share				$ 26.65
Series G Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock	234,000,000	234,000,000
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%
Stock Redeemed or Called During Period, Shares			1,288,300
Payments for Repurchase of Redeemable Preferred Stock			1,300,000,000
Preferred Stock, Shares Outstanding					1,288,301
Preferred Stock, Value, Outstanding					$ 117,000,000