Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 22, 2015	Jun. 30, 2015
Series G Preferred Stock [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share		$ 10.50
Subsequent Event [Member] | Series G Preferred Stock [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share	$ 17.89
Dividends Payable	$ 23
Subsequent Event [Member] | Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share	$ 0.53
Dividends Payable	$ 15