Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Agency securities, at fair value	$ 83,710	$ 54,625
Agency securities transferred to consolidated variable interest entities, at fair value	1,535	58
U.S. Treasury securities, at fair value	0	101
Cash and cash equivalents	2,430	1,367
Restricted cash	399	336
Derivative assets, at fair value	301	82
Receivable for agency securities sold	0	443
Receivable under reverse repurchase agreements	11,818	763
Other assets	260	197
Total assets	100,453	57,972
Liabilities:
Repurchase agreements	74,478	47,681
Other debt	937	54
Payable for agency securities purchased	556	1,919
Derivative liabilities, at fair value	1,264	853
Dividend payable	427	314
Obligation to return securities borrowed under reverse repurchase agreements, at fair value	11,763	899
Accounts payable and other accrued liabilities	132	40
Total liabilities	89,557	51,760
Stockholders' equity:
Preferred stock	167	0
Common stock	3	2
Additional paid-in capital	9,460	5,937
Retained earnings (deficit)	(289)	(38)
Accumulated other comprehensive income	1,555	311
Total stockholders' equity	10,896	6,212
Total liabilities and stockholders' equity	$ 100,453	$ 57,972