Other Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Assets
Mortgage loans in foreclosure, net	$ 151	$ 120
Derivatives	112	178
Repurchase eligible loans	88	99
Real estate owned, net	50	53
Deferred financing costs	41	49
Equity method investments	40	38
Intangible assets	30	31
Other	59	48
Total	$ 571	$ 616