Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Agency securities, at fair value	$ 74,874	$ 83,710
Agency securities transferred to consolidated variable interest entities, at fair value	1,421	1,535
Cash and cash equivalents	2,826	2,430
Restricted cash	499	399
Derivative assets, at fair value	480	301
Receivable for agency securities sold	734	0
Receivable under reverse repurchase agreements	12,291	11,818
Other assets	244	260
Total assets	93,369	100,453
Liabilities:
Repurchase agreements	66,260	74,478
Other debt	862	937
Payable for agency securities purchased	259	556
Derivative liabilities, at fair value	1,217	1,264
Dividend payable	499	427
Obligation to return securities borrowed under reverse repurchase agreements, at fair value	12,548	11,763
Accounts payable and other accrued liabilities	82	132
Total liabilities	81,727	89,557
Stockholders' equity:
Preferred stock	167	167
Common stock	4	3
Additional paid-in capital	11,261	9,460
Retained earnings (deficit)	(557)	(289)
Accumulated other comprehensive income	767	1,555
Total stockholders' equity	11,642	10,896
Total liabilities and stockholders' equity	$ 93,369	$ 100,453