Equity (Common Stock - Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Class of Stock [Line Items]
Proceeds from issuance of common stock	$ 1,000	$ 0
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued	22,679,955
Proceeds from issuance of common stock	$ 1,000