Equity (Narrative - Preferred Stock) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		8.50%	8.50%
Preferred stock dividend rate at August 15, 2016		6.243%
Preferred Stock, Decrease in Shares Authorized	$ 41
Series G Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		7.00%	7.00%